Search query: MOF derived, CO2, Photocatalyst

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abstract: Photoreduction of CO2 to valuable fuels with semiconductor photocatalysts is a good solution to the problems of global warming and energy crisis. Creation of hybrid nanomaterials with hierarchical and/or heterojunction structures is beneficial to develop efficient photocatalysts for CO2 reduction. Herein we present a convenient method to obtain a hybrid photocatalyst consisting of MnS and In2S3 nanosheets with assembled hierarchical structures through using Mn2+ loaded MIL 68(In) submicro rods as templates. Owing to the dispersive Mn2+ and In3+ ions in templates, numerous small p n heterojunctions of MnS/In2S3 could be simultaneously produced in each hierarchical particle. The p type MnS and n type In2S3 with an original type II band alignment can create a stronger built in electric field after the formation of p n heterojunctions, which is favorable for charge separation and migration to catalyst surface. The prepared MnS/In2S3 heterojunctions show an 4 fold higher photocatalytic activity toward CO2 reduction than pristine MnS and In2S3. The MnS/In2S3 hierarchical structures were well characterized and their working mechanism was explored. This work demonstrates a facile strategy to create efficient hybrid photocatalysts with both hierarchical structures and p n heterojunctions for photocatalytic applications.
author_names: Jun Tan

Mengshi Yu

Zhenzhi Cai

Xiaodan Lou

Jun Wang

Zhengquan Li
title: MOF derived synthesis of MnS/In2S3p n heterojunctions with hierarchical structures for efficient photocatalytic CO2 reduction.
venue: Journal of colloid and interface science
year: 2020

abstract: Abstract The conversion of CO2 into clean energy by exploiting porous hollow structure photocatalysts with superior activity is of worldwide interest. In this work, ZnO/NiO porous hollow spheres with sheet like subunits were obtained by calcination of the Ni Zn bimetallic organic frameworks (MOFs) The prepared ZnO/NiO composites exhibited enhanced photocatalytic activity for CO2 recondition, and the highest CH3OH evolution rate was observed for sample ZN 30, which was about 3 times than that of pure ZnO. It is believed that the heterogeneous n type ZnO and p type NiO produced from the decomposition of heterothallic Zn Ni MOFs are homogeneously mixed together, resulting in the formation of many p n heterojunctions which could be benefit to the charge separation. Furthermore, such porous hollow structure could increase the specific surface area, CO2 uptake capacity as well as the light absorption property. Thus, the composite photocatalyst exhibited excellent photocatalytic CO2 reduction performance. This work provides a new insight to finely design and fabricate novel heterogeneous composite with hollow structure in photocatalysis by using multi metallic organic frameworks as the precursors.
author_names: Shiqiang Chen

Jiaguo Yu

Jun Zhang
title: Enhanced photocatalytic CO2 reduction activity of MOF derived ZnO/NiO porous hollow spheres
year: 2018

abstract: Abstract Improving the visible light response and efficient separation of electron hole pairs play vital roles in commonly used TiO2 photocatalyst for VOCs degradation. Herein, N doped mesoporous carbon encapsulated anatase rutile phase junction TiO2 (TiO2@C N(x) was successfully synthesized via the pyrolysis of a representative amine functionalized Ti based MOF, NH2 MIL 125, under the atmosphere of Ar and subsequent CO2 treatment. Our synthesis stragety was based on the rational regulation of the formation of TiO2 phase junction and the decomposition of amorphous carbon onto the TiO2@C N (without subsequent CO2 process) using CO2 as both anatase rutile phase transformation promoter and mild oxidant. Compared with TiO2@C N, TiO2@C N(x) nanocomposites with subsequent CO2 process exhibit significantly improved photocatalytic activity as well as mineralization efficiencies. For example, the mineralization efficiency reached 51.9% at 62.4% of styrene degradation within 240 min of visible light irradiation by using the optimal TiO2@C N(30) nanocomposites as compared with only 19.7% mineralization efficiency at 31.0% of styrene degradation under the same conditions of TiO2@C N. Furthermore, the primary radicals involved in degradation of VOCs was identified by electron paramagnetic resonance spectroscopy, and the possible degradation intermediates were also monitored by means of proton transfer reaction time of flight mass spectrometry (PTR ToF MS) Finally, the radicals involved degradation reaction mechanism was also tentatively proposed.
author_names: Jiangyao Chen

Meicheng Wen

Guiying Li

Taicheng An
title: Highly efficient visible light driven photocatalytic degradation of VOCs by CO2 assisted synthesized mesoporous carbon confined mixed phase TiO2 nanocomposites derived from MOFs
venue: Applied Catalysis B: Environmental
year: 2019

abstract: As the main component of syngas, reducing CO2 to CO with high selectivity through photocatalysis could provide a sustainable way to alleviate energy shortage issues. Developing a photocatalytic system with low cost and high performance that is environmentally friendly is the ultimate goal towards CO2 photoreduction. Herein, an efficient and economic three component heterojunction photocatalyst is designed and fabricated for converting CO2 to CO in the absence of organic sacrificial agents. The heterojunction is made of Cu2 x S nanotubes coated with a carbon layer (C Cu2 x S) and g C3 N4 By using the classical MOF material HKUST 1 as a precursor, hollow tubular like metal sulfides (C Cu2 x S) with carbon coating were synthesized and further loaded on g C3 N4 forming a three component heterojunction C Cu2 x S@g C3 N4 The carbon coat in C Cu2 x S@g C3 N4 acts as an electron reservoir, which facilitates electron hole pair separation. The optimized C Cu2 x S@g C3 N4 acted as a photocatalyst in CO2 reduction with a high reactivity of 1062.6 mmol g 1 and selectivity of 97 Compared with bare g C3 N4 (158.4 mmol g 1 and C Cu2 x S, the reactivity is nearly 7 and 23 fold enhanced and this CO generation rate is higher than most of the reported Cu2 S or g C3 N4 composites under similar conditions. The prominent activity may result from enhanced light adsorption and effective charge separation. This work might open up an alternative method for the design and fabrication of high performance and low cost photocatalysts for efficiently and durably converting CO2 to CO with high selectivity.
author_names: Cheng-Ying Hu

Jie Zhou

Chun-Yi Sun

Meng Chen

Xinlong Wang

Zhongmin Su
title: HKUST 1 Derived Hollow C Cu2 x S Nanotube/g C3 N4 Composites for Visible Light CO2 Photoreduction with H2 O Vapor.
venue: Chemistry
year: 2019

abstract: A new microporous robust zirconium metal organic framework (Zr MOF) NNU 28, has been synthesized and employed as a visible light photocatalyst for carbon dioxide (CO2) reduction to produce formate. NNU 28 is constructed by using a visible light responsive organic ligand derived from an anthracene group. Studies reveal that the as prepared Zr MOF shows desirable characteristics including excellent chemical and thermal stability, high CO2 uptake, broad band visible light absorption and efficient photoinduced charge generation. Remarkably, NNU 28 is highly efficient for visible light driven CO2 reduction with a formate formation rate of 183.3 mmol h 1 mmolMOF 1, which is among the highest performances of Zr MOFs. Both photocatalytic experiments and electron paramagnetic resonance (EPR) studies reveal that both the inorganic building unit Zr6 oxo cluster and the anthracene based ligand contribute to the highly efficient photocatalysis of CO2 reduction. The dual photocatalytic routes are demonstrated here to be more efficient for visible light driven CO2 photoreduction than that typically relying on a ligand to metal charge transfer process, illustrating a new strategy to design and synthesize novel visible light photocatalysts for CO2 reduction with high efficiency.
author_names: Dashu Chen

Hongzhu Xing

Chungang Wang

Zhongmin Su
title: Highly efficient visible light driven CO2 reduction to formate by a new anthracene based zirconium MOF via dual catalytic routes
year: 2016

abstract: Titania exhibits unique photophysical and chemical properties and can be used for potential applications in the field of photocatalysis. The control of TiO2 in terms of phase, shape, morphology, and especially nanoscale synthesis of TiO2 particles still remains a challenge. Ti containing metal organic frameworks (MOFs) such as MIL 125, can be used as sacrificial precursors to obtain TiO2 materials with diverse phase compositions, morphologies, sizes, and surface areas. MIL 125 is composed of Ti/O clusters as the secondary building units (SBUs) bridged by 1,4 benzenedicarboxylate (bdc) In this study, preformed and surfactant stabilized gold nanoparticles (GNPs) were deposited onto the surface of amino functionalized NH2 MIL 125 during solvothermal synthesis. Targeted gold/titania nanocomposites, GNP/TiO2, were fabricated through the pyrolysis of GNP/NH2 MIL 125 nanocrystals. The modification of TiO2 with GNPs significantly increased the photocatalytic activity of the MOF derived TiO2 material for the re.
author_names: Kira Khaletskaya

Anna Pougin

Raghavender Medishetty

Christoph Rosler

Christian Wiktor

Jennifer Strunk

Roland A Fischer
title: Fabrication of Gold/Titania Photocatalyst for CO2 Reduction Based on Pyrolytic Conversion of the Metal Organic Framework NH2 MIL 125(Ti) Loaded with Gold Nanoparticles
year: 2015

abstract: In this contribution we propose an alternative catalytic system based on MOF derivatives and small pore zeolites for the selective conversion of CO2 into light olefins, using the lowest metal loadings and highest GHSV reported in literature. The catalyst synthesis involves deriving In Zr oxides from MOFs containing these metals in their structure, i. e. (Zr)UiO 67 bipy In, via direct calcination in the presence of the zeolite, avoiding co precipitation, washing and mixing steps. This effectively creates a truly bifunctional In Zr zeolite catalyst, opposed to physical mixtures of two catalysts using different precursors. The good dispersion and low loadings of the MOF derived In Zr oxide supplemented with the strong acidity of chabazite type zeolites allows to couple the activation of CO2 with C C coupling, obtaining space time yields of 0.1 mol of CO2 converted to light olefins per gram of In per hour at 375 degC, under the GHSV conditions employed.
author_names: Nuria Martin

Ander Portillo

Ainara Ateka

Francisco G Cirujano

Lide Oar-Arteta

Andres Tomas Aguayo

Michiel Dusselier
title: MOF derived/zeolite hybrid catalyst for the production of light olefins from CO2
year: 2020

abstract: Abstract Recent research in catalyst development for CO2 methanation has been focussing on the design of nanostructures with high porosity and better redox properties. Herein, nanostructured Ce0.8Zr0.2O2 mixed oxide support was prepared by a metal organic framework (MOF) template approach and its properties were well compared with a similar catalyst prepared by a conventional coprecipitation (CP) method. The MOF template approach resulted in the production of a nanoporous Ce0.8Zr0.2O2 support with improved redox properties compared to the coprecipitated Ce0.8Zr0.2O2. The prepared support was then decorated with Co3O4 nanoparticles and tested in CO2 methanation reaction. At 320 degC, 1.5 MPa and GHSV 15,000 mL g 1 h 1, the Co/Ce0.8Zr0.2O2 catalyst prepared by MOF template method achieved far better CO2 conversion (81.2% and improved CH4 selectivity (99% than the catalyst prepared by CP method (48.7% CO2 conversion and 97% CH4 selectivity) The long time presence of the MOF derived Co/Ce0.8Zr0.2O2 catalyst on the stream proved its resistance towards sintering, which may be ascribed to the fine dispersion of Co3O4 nanoparticles as well as their excellent integration in the network of nanoporous Ce0.8Zr0.2O2.
author_names: Deshetti Jampaiah

Devaiah Damma

Anastasios Chalkidis

Perala Venkataswamy

Suresh Kumar Bhargava

Benjaram M Reddy
title: MOF derived ceria zirconia supported Co3O4 catalysts with enhanced activity in CO2 methanation
year: 2020

abstract: Nanostructured N doped TiO2 photocatalyst has been prepared via a new approach from Ti based MOF[NH2 MIL 125(Ti) precursor. The success of N doping enhances light absorption and narrows the bandgap. Moreover, the as prepared nanostructure is constructed with tiny nanoparticles and resembles a pie like morphology inherited from the MOF, which accelerates electron transfer. Hence, as a photocatalyst for the degradation of methylene blue(MB) under visible light irradiation, the N doped TiO2(N TiO2) nanostructure shows higher photocatalytic activity with a reaction rate constant of 0.018 min 1 than that of the TiO2 P25 and TiO2 under the visible light.
author_names: Yilei He

Xiang Zhang

Yanze Wei

Xiaoyu Chen

Zumin Wang

Ranbo Yu
title: Ti MOF Derived N Doped TiO2 Nanostructure as Visible light driven Photocatalyst
venue: Chemical Research in Chinese Universities
year: 2020

abstract: Copper based metal organic frameworks (MOFs) and their derivatives have been attempted to drive CO2 electroreduction, whereas they still suffered from obvious drawbacks like poor selectivity and durability. Here, Cu_btc (btc benzene 1,3,5 tricarboxylate) derived Cu2O/Cu anchored in nitrogen doped porous carbon framework (Cu2O/Cu@NC) was prepared for CO2 electroreduction. The Cu2O/Cu@NC 800 (carbonizing Cu_btc at 800 degC) produced formate and ethanol concurrently with overpotential as low as ~380 mV. However, it exhibited higher selectivity towards formate against ethanol, with the maximum formate faradaic efficiencies 70.5 at 0.68 V versus reversible hydrogen electrode (RHE) which was 1.79 and 1.84 times higher than that of Cu2O/Cu@NC 700 and Cu2O/Cu@NC 900. This superior performance maintained stable over 30 h. The enhancement in activity and selectivity was attributed to (i) higher Cu content and well dispersed Cu2O/Cu nanoparticles inside carbon frameworks which provided abundant active reaction sites, and (ii) higher content of N doped into the Cu2O/Cu lattice to possibly facilitated *OCHO generation. These findings provided a convenient strategy to enhance the activity and selectivity of catalysts for efficient CO2 electroreduction.
author_names: Da Li

Tongtong Liu

Zhengyu Yan

Liang Zhen

Jia Xiang Liu

Jing Wu

Yujie Feng
title: MOF derived Cu2O/Cu nanospheres anchored in nitrogen doped hollow porous carbon framework for increasing the selectivity and activity of electrochemical CO2 to formate conversion.
venue: ACS applied materials interfaces
year: 2020