mlsa-iai-msu-lab/ru_sci_bench_zho_cite_reranking huggingface dataset:
不同处理方法对山桔叶挥发油成分的影响研究

目的对比分析新鲜、阴干、晒干、烘干(40℃)4种不同处理方法对山桔叶挥发油成分的影响。方法采用水蒸气蒸馏法分别提取新鲜、阴干、晒干、烘干(40℃)4种方法处理的山桔叶挥发油成分,并应用GC - MS技术分离和鉴定其各挥发油的组成。结果从新鲜、阴干、晒干、烘干(40℃)4种方法处理的山桔叶挥发油中分别分离鉴定出27、26、26、21个化合物,并分别占总量的91.76% 、72.67%、78.74%、87.53%。结论新鲜、阴干、晒干、烘干(40℃)处理的山桔叶挥发油组成有较大的差异,但均以β-石竹烯和β-甜没药烯的含量较高。
腹腔镜、机器人辅助行胰腺消化道重建策略及技术

胰腺消化道重建是胰十二指肠切除术(pancreaticoduodenectomy,PD)、胰腺中段切除术和保留十二指肠胰头切除术的关键步骤,技术要求高,重建质量和方法与术后胰瘘发生关系密切。2014年,中华医学会外科学分会发布了《胰腺切除术后消化道重建技术专家共识》,强调选择临床医师自身熟悉的术式并提高吻合质量是减少胰瘘发生的关键[1]。近年的腹腔镜和达芬奇外科机器人PD单中心大宗病例研究报告表明,胰消化道重建是制约微创PD发展的瓶颈;而胰瘘仍是微创PD术后常见的严重并发症之一,发生率为8%~30%[2-5]。因此,微创手术中胰腺消化道重建技术和策略再次成为胰腺外科探讨的热点和难点。本文通过分析腹腔镜和达芬奇外科机器人的操作特点,探讨微创PD胰腺消化道重建的策略和技术。
31卷8期疑难病案

2014年10月月经期第3天复查基础性激素FSH 42.41 U/L, LH 36.27 U/L,给予芬吗通(雌二醇片及雌二醇地屈孕酮片)行人工周期调整月经3个月,于当地医院同时监测3个月示无优势卵泡生长。2014年12月复查基础性激素FSH 38.18 U/L, LH 46.21 U/L; 于本中心行遗传学FSH受体基因全部外显子测序,未发现有致病性的病理突变,含有rs6165和rs6166的多态性位点。
Biochar: An Emerging Panacea for Remediation of Soil Contaminants from Mining, Industry and Sewage Wastes

Mine tailings, waste rock piles, acid mine drainage, industrial wastewater, and sewage sludge have contaminated a vast area of cultivable and fallow lands, with a consequence of deterioration of soil and water quality and watercourses due to the erosion of contaminated soils for absence of vegetative cover. High concentrations of toxic elements, organic contaminants, acidic soils, and harsh climatic conditions have made it difficult to re-establish vegetation and produce crops there. Recently, a significant body of work has focussed on the suitability and potentiality of biochar as a soil remediation tool that increases seed emergence, soil and crop productivity, above ground biomass, and vegetation cover on mine tailings, waste rock piles, and industrial and sewage wastecontaminated soils by increasing soil nutrients and water-holding capacity, amelioration of soil acidity, and stimulation of microbial diversity and functions. This review addresses: i) the functional properties of biochar, and microbial cycling of nutrients in soil; ii) bioremediation, especially phytoremediation of mine tailings, industrial waste, sewage sludge, and contaminated soil using biochar; iii) impact of biochar on reduction of acid production, acid mine drainage treatment, and geochemical dynamics in mine tailings; and iv) treatment of metal and organic contaminants in soils using biochar, and restoration of degraded land.
抓痕(皮肤搔抓)障碍研究进展

抓痕(皮肤搔抓)障碍[excoriation (skin picking) disorder,SPD],既往也称病理性皮肤搔抓症、神经质抓痕症或心因性抓痕症,国内也有译为抠皮症、揭痂症等,患者以反复、强迫地皮肤搔抓导致组织损伤为特征。SPD在《美国精神障碍诊断与统计手册第5版》(Diagnostic and Statistical Manual of Mental Disorders, 5~(th) Edition,DSM-5)中被归类为强迫及相关障碍,此外强迫及相关障碍还包括强迫障碍(obsessive-compulsive disorder,OCD)、躯体变形障碍(body dysmorphic disorder,BDD)、囤积障碍(hoarding disorder,HD)、拔毛癖(拔毛障碍)[trichotillomania(hair-pulling disorder),HPD]等。同时,SPD也被考虑纳入到即将出版的《国际疾病与相关健康问题统计分类》(International Statistical Classification of Diseases and Related Health Problems,ICD-11)中。近二十年来,国外学者对SPD进行了系统的理论与实践研究,但是国内的研究起步较晚,故本疾病迫切需要有针对性的本土化研究。
家族性Fahr病一家系报告

Fahr病由Fahr于1930年首次报道并命名,国内1983年蒋雨平首先报道,称为特发性双侧对侧性大脑基底节钙化症,可散发或呈家族性发病,目前尚无明确病因。随着神经影像学的发展和医患双方筛查意识的加强,近年来Fahr病报道数量有所增多,但因其起病隐匿、临床表现多样、发病率低,故容易发生误诊漏诊或忽略家族中的潜在病患。笔者近期发现一Fahr病高发家系,总结分析其临床特点、CT表现和遗传学特征,以提高对Fahr病的认识水平,现报道如下。
梨园水电站溢洪道弧形工作闸门安装技术

梨园水电站位于迪庆州香格里拉县(左岸)与丽江地区玉龙县(右岸)交界河段,是金沙江中游河段规划的第三个梯级,上游与两家人水电站相衔接,下游为阿海水电站。梨园水电站坝址距丽江市、昆明市、攀枝花市公路里程分别为180 km(经鸣音)、737 km和485 km(经宁蒗)。
泵送抗冲磨混凝土在观音岩水电站右岸大坝溢流面施工中的应用

观音岩水电站右岸大坝泄洪建筑物由岸边溢流表孔、导流明渠溢流表孔组成。岸边溢流道表孔孔口为13 m×21 m,孔数为4孔,堰顶高程1 113 m,坝后泄槽分两槽,宽均为33 m,底坡均为7.5%,泄槽尾部设挑坎,将水流挑入下游河道。溢流表孔、闸墩(导墙)过流面抗冲磨混凝土总计3万多m~3,因泄洪时流速很大,质量要求很高,并且工期紧,施工难度大,是整个观音岩水电站工程质量控制重点之一。在挡水大坝中抗冲磨混凝土主要分布在泄洪建筑物的过流面、引水口,一般是过流面表层50 ~100 cm,平整度要求高,基本处于高程较大的位置,工程初期抗冲磨混凝土采用低坍落度(50~70 mm)浇筑,入仓难度很大,浇筑过程中对混凝土实体质量造成了一定的影响。结合室内配比与现场实际,采用泵送配合比浇筑极大地解决了上述的入仓及施工难题,并保证了混凝土的质量,值得其他类似工程借鉴。
观音岩水电站右岸大坝碾压混凝土工艺原位抗剪试验研究

观音岩水电站位于云南省丽江市华坪县与四川省攀枝花市交界的金沙江中游河段,为金沙江中游河段规划的八个梯级水电站的最末一个梯级,上游与鲁地拉水电站相衔接。水电站坝址距攀枝花市公路里程约87 km,距华坪县城公路里程约40 km。攀枝花市距成都市公路里程约768 km,距昆明市公路里程约333 km。成昆铁路支线格里坪站距坝址直线距离约10 km。
呼和浩特抽水蓄能电站下水库工程右岸潜在不稳定块体处理技术

呼和浩特抽水蓄能电站下水库工程施工过程中出现一处不稳定块体。不稳定块体位于2~#环库公路K10 +283.5 ~K10 +380范围的路上、路下边坡段,贯穿工区唯一交通道路2~#路路基。不稳定块体路上出露最高高程1 475.00 m,路下1 355.00 m,主要由F_(10)、F_(11)断层切割而成,据断层倾向、倾角推断不稳定块体体型方量约7.5万m~3。该部位基岩以花岗岩为主,由于岩体长期裸露、风化,造成断层岩体构造裂隙发育、延伸较长,产生不稳定体,造成边坡整体潜在不稳定。现行交通设备的碾压振动或后期电站运行时水位频繁的升降会恶化岩体内部结构,易导致塌方和滑坡。7.5万m~3的体量如全部开挖,进行混凝土置换,工期势必较长,严重影响下水库主体工程施工及社会道路通行。
卵巢透明细胞癌诊断及分子标志物的作用

卵巢的透明细胞癌(ovarian clear cell carcinoma, OCCC)的发病率占所有卵巢恶性肿瘤的5% ~25%,仅次于高级别浆液性腺癌(70%),其因病死亡率位居第二。OCCC发病有明显的人种差异,欧美地区OCCC的发病率占总卵巢癌的5% ~ 10%;亚洲地区高发,日本报道OCCC的发病率为20% ~25%。中国OCCC发病率尚未检索到报道,复旦大学附属妇产科医院2011—2014年的OCCC新诊断病例占所有卵巢原发性上皮性恶性肿瘤的17.1% (72/420)。
Clinical Features of an Unrecognized 21-hydroxylase Deficiency Woman During Controlled Ovarian Hyperstimulation

To the Editor: Nonclassic congenital adrenal hyperplasia (NCAH) due to 21-hydroxylase deficiency (21-OHD) is one of the most common autosomal recessive disorders. Affected individuals typically present signs and symptoms related to excessive androgens. In the process of assisted reproductive technique (ART), the clinical features of NCAH may evade our attention and, therefore, be left untreated. Here, we present a case of NCAH, who underwent controlled ovarian hyperstimulation (COH).
Effect of Intravascular Ultrasound-assisted Thoracic Endovascular Aortic Repair for "Complicated" Type B Aortic Dissection

Background: Intravascular ultrasound (IVUS) examination can provide useful information during endovascular stent graft repair. However, its actual clinical utility in thoracic endovascular aortic repair (TEVAR) for type B aortic dissection (type B-AD) remains unclear, especially in complicated aortic dissection. We evaluated the effect of IVUS as a complementary tool during TEVAR. Methods: From September 2011 to April 2012, we conducted a prospective cohort study of 47 consecutive patients with "complicated" type B-AD diagnosed. We divided the patients into two groups: IVUS-assisted TEVAR group and TEVAR using angiography alone group. The general procedure of TEVAR was performed. We evaluated the perioperative and follow-up events. Patient demographics, comorbidities, preoperative images, dissection morphology, details of operative strategy, intraoperative events, and postoperative course were recorded. Results: A total of 47 patients receiving TEVAR were enrolled. Among them (females, 8.51%; mean age, 57.38 ± 13.02 years), 13 cases (27.66%) were selected in the IVUS-assisted TEVAR group, and 34 were selected in the TEVAR group. All patients were symptomatic. The average diameter values of IVUS measurements in the landing zone were greater than those estimated by computed tomography angiography (31.82 ± 4.21 mm vs. 30.64 ±4.13 mm, P< 0.001). The technique success rate was 100%. Among the postoperative outcomes,statistical differences were only observed between the IVUS-assisted TEVAR group and TEVAR group for total operative time and the amount of contrast used (P = 0.013 and P < 0.001, respectively). The follow-up ranged from 15 to 36 months for the IVUS-assisted TEVAR group and from 10 to 35 months for the TEVAR group (P = 0.646). The primary endpoints were no statistical difference in the two groups. Conclusions: Intraoperative IVUS-assisted TEVAR is clinically feasible and safe. For the endovascular repair of "complicated" type B-AD, IVUS may be helpful for understanding dissection morphology and decrease the operative time and the amount of contrast used.
Fascin-1在甲状腺癌中的表达及其临床病理意义

近年来,我国甲状腺癌的发病率逐年增加。目前,虽然传统的治疗方案(手术+~(131)I+甲状腺素)能治愈多数甲状腺癌患者,但仍有部分患者的疗效欠佳,而常规放疗、单一或联合化疗治疗难治性甲状腺癌的作用十分有限。因此,寻找与甲状腺癌发生、发展相关的生物标记物,并对其进行干预,对提高患者的生存质量和生存率有着重要意义。Fascin-1是一种编码相对分子质量为55 000的细胞骨架蛋白,其高表达与乳腺癌、胃癌等多种肿瘤的发生发展有关。我们采用免疫组化法检测172例甲状腺癌组织及50例甲状腺良性病变组织中Fascin-1蛋白的表达,探讨其在甲状腺癌发生发展中的作用。
Preparation of high-purity monodisperse silica microspheres by the sol–gel method coupled with polymerization-induced colloid aggregation

Ultra-pure mesoporous silica microspheres with good monodispersity were synthesized in two steps: nanometer-sized silica sol was produced by the sol–gel process, then micrometer-sized silica microspheres were synthesized by polymerization-induced colloid aggregation of the silica sol. The total metal content of the microspheres was extremely low, which eliminated the tailing of chromatographic peaks by chelating reagents. The pore structure of the silica microspheres could be controlled by altering the sol–gel conditions. The silica microsphere particle size could be adjusted by using different polymerizationinduced colloid aggregation conditions.
Fabrication of submicron barium sulfate aggregates in the presence of ethylenediaminetetraacetic acid anions

Barium sulfate aggregates with an average size of 0.5 μm were synthesized at pH 7, directed by ethylenediaminetetraacetic acid (EDTA) anions. The particle morphology, chemical composition, and size distribution of the BaSO_4 aggregates were characterized. The as-synthesized BaSO_4 particles were spherical and comprised many interconnected nanoballs, of which the surface properties were affected by the EDTA anions. The adsorption of EDTA anions reversed the charge and weakened the surface polarity of BaSO_4, instigating the formation of aggregates by a self-assembly and transformation process. The resulting BaSO_4 particles at pH 9–10 were ellipsoidal and featured smooth surfaces. Based on the zeta potential of BaSO_4, variations in the morphology induced by changes in pH were closely related to the adsorption of mono- and multi-valent anions onto the electrical double layer of BaSO_4.
Distribution characteristics and policy implications of territorial development suitability of the Yangtze River Basin

Territorial development suitability (TDS) distribution and policy implications in the Yangtze River Basin are investigated through the use of statistical and spatial data, using the Delphi method, the analytic hierarchy process method and the comprehensive evaluation model. The distribution pattern and characteristics of TDS in the Yangtze River Basin are studied, providing a scientific basis and a decision-making reference for sustainable development of the whole basin, and promoting reasonable implementation of the Yangtze River economic belt development strategy. The results show that the overall level of development constraint is relatively high, and that high-value regions (grades Ⅴ–Ⅷ) are mainly distributed in the upper and middle reaches of the basin. The suitable development regions account for 22.95% of the total basin area, mainly including the Yangtze River Delta region, the provincial capitals, the urban agglomerations and most prefecture-level cities. The variation of TDS is significant among the upper, middle and lower reaches of the basin, and the high-value areas account for 8.24%, 35.70% and 82.97% of the total areas of the upper, middle and lower reaches, respectively. Three policy suggestions are proposed: (1) strict control of the basin development intensity, setting up an efficient and well-organized spatial development pattern, (2) implementation of different regional policies according to different functional orientations, and (3) strengthening of communication and cooperation between different regions, thus promoting integrated basin protection and development.
Phenological basis of determining tourism seasons for ornamental plants in central and eastern China

Many plants have high ornamental value during specific phenophases, and plant phenology correlates highly with seasonal vegetation landscape. Determination of the span and spatiotemporal patterns of the tourism season for ornamental plants could provide tourism administrators and the tourists themselves with a theoretical basis for making travel arrangements. Based on data derived from on-the-ground observations of three phenophases, specifically first leafing date, full flowering date, and end of leaf coloring date, and corresponding meteorological data at 12 sites in China, we divided the tourism season into its starting date, peak (best date) and end date for ornamental plants by computing frequency distributions of these phenophases. We also determined how the peak of this tourism season changed during the course of the past 50 years. We found that: (1) The peak of the tourism season ranged from March 16 (in Guilin) to May 5 (in Harbin) for first leafing, from April 3 (in Kunming) to May 24 (in Mudanjiang) for full flowering, and from October 1 (in Mudanjiang) to November 30 (in Shanghai) for leaf coloring. As might be expected, the peaks of both the first leafing and full flowering tourism seasons were positively associated with latitude, while for leaf coloring it was negatively correlated with latitude. (2) The ideal tourism season for first leafing and full flowering advanced by more than 0.16 days/year over the past 50 years in Beijing and Xi’an, while the peak of the tourism season for leaf coloring became significantly delayed (by 0.16 days/year in Beijing and 0.21 days/year in Xi’an). (3) The tourism season was significantly associated with temperature across related phenological observation sites. The ideal time for first leafing and full flowering was determined to have advanced, respectively, by 4.02 days and 4.04 days per 1°C increase in the spring (March-May) temperature. From September to November, the best time for leaf coloring correlated significantly and positively with average temperature, and the spatial sensitivity was 2.98 days/°C.
The measurement of the spatial effects of Chinese regional carbon emissions caused by exports

Based on the multi-regional input-output analysis, this paper improves the four traditional input-output formulas about exports resulting in multi-regional carbon emissions spatial effects which include direct effect, indirect effect, spillover effect and feedback effect. And the latter two formulas are to measure the bidirectional influences of carbon emissions induced by regional exports between two regions. The results suggest that the direct effects of Chinese eight regions induced by national exports decreased from 1997 to 2010, and the indirect effects induced by national exports also decreased except the northern coastal region and the northwestern region in China. During this period, most of Chinese coastal regions had strong spillover effects induced by their own exports. The northern coastal region and the eastern coastal region had stronger feedback effects, while the southern coastal region had weaker feedback effects and Beijing-Tianjin region had the weakest feedback effect induced by their exports. All of the inland regions had strong feedback effects, especially for Northwest and Central China, induced by their exports. More attention should be paid to the inter-regional joint efforts in order to effectively achieve Chinese national carbon-reduction target.
Climatology of dust storms in northern China and Mongolia: Results from MODIS observations during 2000–2010

The climatology of dust storms in northern China and Mongolia (33°N–54°N, 73°E–136°E) is characterized at a 1-km resolution based on Moderate Resolution Imaging Spectroradiometer (MODIS) thermal observations during 2000–2010. The dust was extracted with the dynamic reference brightness temperature differences (DRBTD) dust detection algorithm. The major dust source regions are deserts, including the Tarim Basin, Hexi Corridor, Gobi in Mongolia and northern China, Horqin Sandy Land and Qaidam Basin. Dust storms occur most frequently in the Tarim Basin, with a maximum frequency (above 10%) in the eastern narrow inlet of the Taklimakan Desert around Lop Nor. Significant annual and seasonal variations are found for dust events. More than 63.8% of dust events occur in spring from March to May, with the maximum proportion (up to 29.6%) occurring in April. Severe dust storms occur mainly in the deserts in northern and northwestern China, and the largest source region is the eastern narrow inlet and the southern margin of the Taklimakan Desert.
Spatiotemporal differences and influencing factors of multiple cropping index in China during 1998–2012

Raising the level of the multiple cropping index (MCI) plays a critical role in food production of China. Therefore, exploring the spatiotemporal differences and factors of the MCI in China is of important practical significance. This paper examines the trend of multiple cropping index (MCI) changes in China at the national, regional and provincial levels during 1998–2012. Based on the Theil index, this paper explores the spatiotemporal differences of the MCI in China. Additionally, a spatial econometric model is used to identify the determinants of the spatiotemporal differences of the MCI from a behavioral perspective. The results are summarized as follows: (1) From the national perspective, the MCI shows an increasing trend year by year, rising from 120.1% in 1998 to 134.26% in 2012; (2) at the regional level, the northeastern region is the fastest growing area in terms of MCI, whereas the central region is the slowest growing area. The central region has the highest MCI level, whereas the northeastern region is connected to the lowest MCI level; (3) according to the Theil index value, the differences in the MCI show a narrowing trend from 0.11 in 1998 to 0.03 in 2012, which is primarily attributed to the differences among the four regions; (4) the MCI shows differences among China’s 31 provinces, and the gap that it shows is great; and (5) the proportion of non-agricultural population has a significant negative effect on the MCI. However, the proportions of non-agricultural industry, agricultural policy, per capita operating arable land area and rural household per capita net income have a significant positive impact on the MCI. Therefore, the following policies are suggested to increase the level of China’s cultivated land MCI: transferring rural surplus labor, increasing the farmers’ income, accelerating the transfer of the use rights of arable land, developing the scale effect of land use, providing further support and benefits to farmers in less developed regions and major grain-producing areas, and strengthening the role of the national agricultural policy.
Solution-Processed High Mobility Top-Gate N-Channel Polymer Field-Effect Transistors

Polymer field-effect transistors operated in the n-channel model with a top-gate/bottom-contact are processed using a solution method. The transistor performance depends on the gate dielectric layer. A high performance polymer transistor is achieved, with the saturated electron mobility of about 0.46 cm~2/Vs, threshold voltage nearly 0V and subthreshold sway of about 0.9 V/decade, employing a polystyrene (PS) dielectric layer. The transistor performances are further improved with increasing current and lower operation voltages by utilizing a bi-layer gate dielectric, comprising a thin PS dielectric layer adjacent to the semiconductor to minimize the density of the interface traps for obtaining a small V_T, a large μ and a poly(methyl methacrylate) (PMMA) dielectric layer with a relatively high-k adjacent to the gate electrode for enlarging the capacitance, processed from the orthogonal solvents.
A 60W Tm:YLF Laser with Triple Tm:YLF Rods

A narrow linewidth stable high-power continuous-wave 3.5% Tm~(3+) doped LiYF4 (Tm:YLF) laser is reported. By using dual F–P etalons and three Tm:YLF rods in a cavity, laser output of ～60W at 1907.7nm is obtained with a slope efficiency of 34.8%. The M~2 factor is found to be ～2.0 under an output power of 30 W. In addition, the relaxation oscillation and efficiency of the Tm:YLF laser are also studied. The relaxation oscillation of the Tm:YLF laser is improved obviously by setting the ratio of pump beam to oscillating laser beam as ～1.5:1 and the efficiency is increased in comparison with the ratio of ～1.3:1.
Measurement of Refractive Index Ranging from 1.42847 to 2.48272 at 1064nm Using a Quasi-Common-Path Laser Feedback System

Wavelength 1064nm is one of the most widely used laser wavelengths in industries and science. The high-precision measurement of the refractive index of optical materials at 1064 nm is significant for improving the optical design. We study the direct measurement of refractive index at 1064 nm of lasers, including calcium fluoride (CaF_2), fused silica and zinc selenide (ZnSe), whose refractive indices cover a large range from 1.42847 to 2.48272. The measurement system is built based on the quasi-common-path Nd:YAG laser feedback interferometry. The thickness can be measured simultaneously with the refractive index. The results demonstrate that the system has absolute uncertainties of ～10~(–5) and ～10~(–4) mm in refractive index and thickness measurement, respectively.
Vector Based Reconstruction Method in Magneto-Acousto-Electrical Tomography with Magnetic Induction

Magneto-acousto-electrical tomography with magnetic induction (MAET-MI) is an imaging modality proposed for noninvasive conductivity imaging of high spatial resolution. A conductivity reconstruction algorithm based on the current vector is presented in the MAET-MI. Firstly, the fundamental mechanism of the MAET-MI is introduced in both the forward and the inverse problems. Then the orthogonal matching pursuit algorithm is implemented to reconstruct the current vector according to the reciprocal theorem. Furthermore, the two components of the current vector are employed to reconstruct the conductivity, which is based on the proposed logarithmic reconstruction algorithm. Lastly, a computer simulation is conducted to show the capability and the reliability of the proposed method in the conductivity reconstruction.
SnO_2/corncob-derived activated carbon nanohybrid as an anode material for lithium-ion batteries

A facile synthesis of SnO_2/corncob-derived activated carbon(CAC) composite was proposed,and the CAC used here has high specific surface area(over 3000 m~2/g) and ample oxygen-containing functional groups.The microstructures and morphology as well as electrochemical performance of the SnO_2/CAC composites were investigated by X-ray diffraction,scanning electron microscopy,transmission electron microscopy and relevant electrochemical characterization. The results show that the mass ratios of SnO_2 to CAC have a significant effect on the structures and properties of the composites. The sample with 34% SnO_2 delivered a capacity of 879.8 m Ah/g in the first reversible cycle and maintained at 634.0 m Ah/g(72.1% retention of the initial reversible capacity) after 100 cycles at a current density of 200 m A/g. After 60 cycles at different specific currents from 200 to 2000 m A/g,the reversible specific capacity was still maintained at 632.8 m Ah/g at a current density of 200 m A/g. These results indicate that SnO_2/CAC can be a desirable alternative anode material for lithium ion batteries.
Reactive adsorption desulfurization coupling aromatization on Ni/ZnO-Zn_6Al_2O_9 prepared by Zn_xAl_y(OH)_2(CO_3)_z·x H_2O precursor for FCC gasoline

Aiming to improve the reactive adsorption desulfurization(RADS) performances of Ni/Zn O adsorbents,Zn_xAl_y(OH)_2(CO_3)_z·x H_2 O precursor is synthesized by coprecipitation of Zn~(2+),AlO_2~-,and CO~(2-)_3; the Zn OZn_6Al_2O_9 composite oxides are obtained by the calcination of Zn_xAl_y(OH)_2(CO_3)_z·x H_2 O precursor,and the Ni/Zn O-Zn_6Al_2O_9(6.0 wt% NiO) adsorbents are prepared by wetness impregnation method. The phase,acid strength,acid type and quantity,morphology,and thermal properties were characterized by X-ray diffraction,temperature-programmed desorption of ammonia,pyridine-adsorbed infrared spectrum,high-resolution transmission electron microscopy,and Thermo Gravimetry-Derivative Thermo Gravimetry(TG-DTG),respectively. The breakthrough sulfur capacities of six adsorbents are between 34.2 and 47.9 mg/gcat. The kinetic studies indicated that the active energy of RADS(49.4 k J/mol) could reach nano-sized Zn O,the particle size of is about 12.0 nm. All the excellent RADS performances can be due to the high SBET. Also,there are some extents of aromatization reactions that occur,which can be contributed to the Bonsted acid rooted in Zn_6Al_2O_9 composite oxide,and the octane number of products can be preserved well.