Search query: zeolite carbon dioxide photoconversion

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abstract: Abstract The leaf is a prime example of a material converting waste (CO2) into value with maximum sustainability. As the most important constituent, it contains the coupled photosystems II and I, which are imbedded in the cellular membrane of the chloroplasts. Can key functions of the leaf be packed into soap? We present next generation surfactants that self assemble into bilayer vesicles (similar to the cellular membrane) are able to absorb photons of two different visible wavelengths, and exchange excited charge carriers (similar to the photosystems) followed by conversion of CO2 (in analogy to the leaf) The amphiphiles contain five dye molecules as the hydrophobic entity attached exclusively to one hemisphere of a polyhydroxylated fullerene (Janus type) We herein report on their surfactant, optical, electronic, and catalytic properties. Photons absorbed by the dyes are transferred to the fullerenol head, where they can react with different species such as CO2 to give formic acid.
author_names: Marius Kunkel

Sebastian Sutter

Sebastian Polarz
title: Molecular Semiconductor Surfactants with Fullerenol Heads and Colored Tails for Carbon Dioxide Photoconversion
venue: Angewandte Chemie
year: 2019

abstract: In the CO2 sequestration, a desirable yet challenging option is the photocatalytic conversion with solar irradiation. While nanoscale semiconductors have been at the center of attention in the development of suitable photocatalysts for the CO2 conversion, carbon nanoparticles have recently emerged as a new class of photoactive materials for harvesting visible photons to drive photocatalytic processes. Results from this study demonstrate that aqueous suspended bare carbon nanoparticles could be excited with visible light to photocatalytically convert CO2 into formic acid, with the performance competitive to that of widely used semiconductor nanoparticles.
author_names: Sushant Sahu

Li Cao

Mohammed Meziani

Christopher E Bunker

Kurukulasuriya Alexius Shiral Fernando

Ping Wang

Ya-Ping Sun
title: Carbon dioxide photoconversion driven by visible light excitation of small carbon nanoparticles in various configurations
year: 2015

abstract: Abstract Novel asymmetric polyethersulfone membranes loaded with SAPO 34 particles were prepared using phase inversion technique and then surface coated with PDMS using spin coating method. The mixed matrix membranes were then characterized by FTIR, TGA, SEM EDX and gas permeation analysis. Effect of SAPO 34 loading alongwith operating pressure was also analyzed on gas permeation properties of both coated and uncoated membranes. SAPO 34 loading resulted in improvement of permeability of all the gases without much decrease in CO2 ideal selectivity with respect to methane and nitrogen whereas PDMS coating resulted in improvement of ideal selectivity of CO2 at the expense of decrease of permeance of all the gases. It was found that PDMS coated PES membrane, loaded with 30 wt. SAPO 34, having thickness of 45 um, demonstrated high CO2 permeance of 641.77 GPU, CO2/CH4 ideal selectivity of 4.45 and CO2/N2 ideal selectivity of 12.45, respectively at 20 bar and 25 degC. It was found that the performance of this membrane crossed the Robeson upper bound limit 2008 for CO2/N2 separation whereas for CO2/CH4 separation it crossed the previous upper bound limit 1991. Finally, the performance of this membrane was also analyzed under mixed gas conditions for CO2/CH4 separation at high pressure.
author_names: Bilal Haider

Muhammad Rizwan Dilshad

M A U Rehman

Jurgen Schmitz

Malte Kaspereit
title: Highly permeable novel PDMS coated asymmetric polyethersulfone membranes loaded with SAPO 34 zeolite for carbon dioxide separation
year: 2020

abstract: Abstract New active and selective catalysts for propane to propene dehydrogenation in assistance of CO2 (CO2 PDH) were prepared by chromium incorporation in siliceous SiBeta. The Cr containing SiBeta zeolite catalysts were obtained by two step postsynthesis preparation procedure which consist, in the first step, removal of aluminum from TEABeta zeolite with Si/Al of 17 by treatment with nitric acid solution to obtain an aluminium free SiBeta support with Si/Al ratio of 1000 and, in the second step, various amounts of Cr were introduced into the siliceous SiBeta zeolite structure by wet impregnation. The well correlation between the number of redox Cr sites and propene yield up to 2 wt of Cr has been determined. Comparing of catalytic activity of Cr containing Beta zeolite catalysts with the identical Cr content (2 wt of Cr) supported on SiBeta and AlBeta revealed that the dealumination has great impact on catalytic properties. Low acidity of SiBeta is suitable for achieving high selectivity to propene (above 80 while high acidity of starting AlBeta promotes propane cracking to lighter hydrocarbons. Moreover, in switch operation mode between propane dehydrogenation in presence and absence of CO2 the formation rate of propene raises in mode with CO2 only over Cr containing SiBeta zeolite catalyst, while over Cr containing AlBeta zeolite catalyst a negative effect on the rate of propene formation was observed.
author_names: Piotr Michorczyk

Kamila Zenczak-Tomera

Barbara Michorczyk

Adam Wegrzyniak

Marcelina Basta

Yannick Millot

Laetitia Valentin

Stanislaw Dzwigaj
title: Effect of dealumination on the catalytic performance of Cr containing Beta zeolite in carbon dioxide assisted propane dehydrogenation
year: 2020

abstract: Carbon dioxide and water vapor were effectively photoconverted to methane using either pure or modified TiO2 and UV Vis irradiation. The process of photoconversion in the gas phase was carried out in a tubular reactor equipped with a perforated TiO2 coated support. The effect of selected parameters of TiO2 immobilization procedure, such as the time and temperature of drying step and the photocatalyst amount, on photocatalytic efficiency was investigated. The effect of TiO2 loading with Ag/Au nanoparticles on CO2 photoconversion efficiency was also studied. CH4 was found to be the major photoreduction product. The highest methane production was observed after irradiation of CO2+H2O mixture over Au TiO2 photocatalyst. After one hour of UV Vis irradiation 503 ppm of methane was formed.
author_names: Anna Cybula

Marek Klein

Anna Zielinska-Jurek

Marcin Janczarek

Adriana Zaleska
title: CARBON DIOXIDE PHOTOCONVERSION. THE EFFECT OF TITANIUM DIOXIDE IMMOBILIZATION CONDITIONS AND PHOTOCATALYST TYPE
year: 2012

abstract: ii DEDICATION iii ACKNOWLEDGMENTS iv LIST OF TABLES viii LIST OF FIGURES ix LIST OF SCHEMES. xviii
author_names: Sushant Sahu
title: DEVELOPMENT AND EVALUATION OF CARBON BASED QUANTUM DOTS FOR CARBON DIOXIDE PHOTOCONVERSION
year: 2014

abstract: Abstract The porous material adsorbent X zeolite was prepared by using agricultural waste rice hull ash (RHA) and modified by ion exchange into the rare earth metal zeolite of La and Ce. A series of characterization results, including X ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, N2 adsorption desorption and pore size analysis, illustrated the effects of ion exchange modification on crystal, pore structure and morphology. The CO2 adsorption experiment was operated, and the adsorption amount of NaX and LaLiX was 6.14 and 4.36 mmol/g at atmospheric pressure, respectively. Three isotherm models were used to fit the pressure swing adsorption data. The Toth and DSL models were more accurate due to their ability to express heterogeneity. The isosteric heat and selectivity were obtained by the corresponding models and calculations. The results explained the mechanism of heat and gas uptake during adsorption and desorption. The CO2/N2 selectivity of LaNaX has enhanced more than three times. All modified zeolite samples maintained above 96.5% of initial adsorption after 20 adsorption desorption cycles. The adsorption heat releases properties and long term stability of the modified zeolite are superior. It demonstrates that such adsorbents can be used for long term capture and separation of CO2 from the industrial exhaust gas.
author_names: Yi-song Wang

He Jia

Peng Chen

Xin Fang

Tao Du
title: Synthesis of La and Ce modified X zeolite from rice husk ash for carbon dioxide capture
year: 2020

abstract: Abstract Amine based solid sorbents are promising candidates for post combustion CO2 capture owing to their high sorption capacity at operating temperatures. Sorbents are required for stable CO2 mixture sorption and regeneration. Herein, we report a novel alkyl functionalization method for the stoichiometric conversion of primary amines to secondary amines in solid sorbents. (3 Aminopropyl)triethoxysilane (APTES) and alkyl functionalized APTES were grafted on zeolite beta through a reflux reaction; the alkyl functionalization was confirmed by nuclear magnetic resonance and Fourier transform infrared analyses. Alkyl functionalized APTES zeolite exhibited a sorption capacity of 1.44 mmol/g (15% CO2 balanced with N2 at 90 degC) very high sorption rate of t1/2 0.69 min (over 90% of the total sorption capacity within 5 min) and long term stability after 20 cycles in a temperature swing adsorption (TSA) operation (above 0.9 mmol/g at pure CO2 regeneration) Alkyl functionalized APTES zeolite beta showed higher sorption capacity and stability than APTES zeolite and PEI silica in TSA operation at CO2 mixture sorption and CO2 flow regeneration.
author_names: Lei Liu

Seongmin Jin

Kwang Jun Ko

Hyejoo Kim

Ik Sung Ahn

Chang-Ha Lee
title: Alkyl functionalization of (3 Aminopropyl)triethoxysilane grafted zeolite beta for carbon dioxide capture in temperature swing adsorption
year: 2020

abstract: ABSTRACT Releasing of greenhouse gas results in global warming. In which cement production plants are also blamable for some quantity of carbon dioxide emission. Hence it is necessary to minimize the amount of carbon dioxide emission from cement production plants. So zeolite 4a powder and silica fume substituting for cement, investigation is carried out. Zeolite has the property of absorbing carbon dioxide up to certain percentage and silica fume used to keep the strength of the concrete. In this study grade of concrete used is M25 and cement is substituted by 5% 10% 15% 20% of zeolite and silica fume combination. Concrete is checked for its carbon dioxide absorbing capacity, workability parameters and strength parameters.
author_names: N AthulK

Pushparaj A Naik
title: A STUDY ON PROPERTIES OF CARBON DIOXIDE ABSORBING CONCRETE USING ZEOLITE AND SILICA FUME
year: 2020

abstract: The Intergovernmental Panel on climate changes have concluded thatMost paths to halting global temperature increases at 2 degrees and every way to decrease it to 1.5 degrees depend on adopting methods of sucking CO2 from the sky. "CO2 removal has gone from a moral hazard to a moral imperative," says Julio Fried Mann senior research scholar at the Center for Global Energy Policy at Columbia University. There are many industries emitting the flue gases which include steam, sulphur dioxide, nitrogen dioxide, carbon dioxide. One such industry which emits carbon dioxide is cement industry. A single cement industry accounts for around 5 percent of global carbon dioxide emissions. Concrete is the second most widely used material on earth after the water. Concrete is used for wide range of applications like construct buildings, bridges, roads, runways, sidewalks, and dams. So, here's the concrete with zeolite powder and zeolite sand that captures the carbon dioxide from the ambient air and reduces the atmospheric carbon dioxide making it eco friendly. Also addition of zeolite to the concrete improves the mechanical strength of the concrete. It is more durable than the ordinary Portland cement. In this review paper, we will discuss the performance and properties of concrete incorporated with zeolite.
author_names: Hanusha Durisety

Kiranmai Palcham

K Prasad Babu
title: The Concrete Incorporated with Zeolite for Reducing Atmospheric Carbon Dioxide
year: 2020