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Reverse water gas shift reaction over a Cu/ZnO catalyst supported on regenerated spent bleaching earth (RSBE) in a slurry reactor: the effect of the Cu/Zn ratio on the catalytic activity

The catalytic conversion of CO(2)via the Reverse Water Gas Shift (RWGS) reaction for CO production is a promising environment-friendly approach. The greenhouse gas emissions from burning fossil fuels can be used to produce valuable fuels or chemicals through CO(2) hydrogenation. Therefore, this proj...

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Autores principales: Phey Phey, Melissa Low, Tuan Abdullah, Tuan Amran, Md Ali, Umi Fazara, Mohamud, Mohamed Yusuf, Ikram, Muhammad, Nabgan, Walid
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9850704/
https://www.ncbi.nlm.nih.gov/pubmed/36756434
http://dx.doi.org/10.1039/d2ra07617a
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author Phey Phey, Melissa Low
Tuan Abdullah, Tuan Amran
Md Ali, Umi Fazara
Mohamud, Mohamed Yusuf
Ikram, Muhammad
Nabgan, Walid
author_facet Phey Phey, Melissa Low
Tuan Abdullah, Tuan Amran
Md Ali, Umi Fazara
Mohamud, Mohamed Yusuf
Ikram, Muhammad
Nabgan, Walid
author_sort Phey Phey, Melissa Low
collection PubMed
description The catalytic conversion of CO(2)via the Reverse Water Gas Shift (RWGS) reaction for CO production is a promising environment-friendly approach. The greenhouse gas emissions from burning fossil fuels can be used to produce valuable fuels or chemicals through CO(2) hydrogenation. Therefore, this project was to study the CO(2) conversion via RWGS over various Cu/ZnO catalysts supported by regenerated spent bleaching earth (RSBE) prepared by wet impregnation technique with different Cu : Zn ratios (0.5, 1.0, 1.5, 2.0, 3.0). The causes of environmental pollution from the disposal of spent bleaching earth (SBE) from an edible oil refinery can be eliminated by using it as catalyst support after the regeneration process. The synthesized catalysts were characterized by thermogravimetric analysis (TGA), X-ray diffraction (XRD), temperature-programmed reduction of hydrogen (TPR-H(2)), pyridine-adsorbed Fourier transform infrared (FTIR-pyridine), temperature programmed desorption of carbon dioxide (TPD-CO(2)), N(2) physisorption, and Fourier transform infrared (FTIR) analysis. The RWGS reaction was carried out in a slurry reactor at 200 °C, with a pressure of 3 MPa, a residence time of 4 h, and catalyst loading of 1.0 g with an H(2)/CO(2) ratio of 3. According to experimental data, the Cu/Zn ratio significantly impacts the catalytic structure and performance. The catalytic activity increased until the Cu : Zn ratio reached the maximum value of 1.5, while a further increase in Cu/Zn ratio inhibited the catalytic performance. The CZR3 catalyst (Cu/Zn ratio of 1.5) with a higher catalytic reducibility, high copper dispersion with small crystalline size, lower total pore volume as well as higher basicity showed superior catalytic performance in terms of CO(2) conversion (40.67%) and CO yield (39.91%). Findings on the effect of reaction conditions revealed that higher temperature (>240 °C), higher pressure (>3 MPa), higher reaction time (>4 h) and higher catalyst loading (>1.25 g) could improve CO(2) conversion to CO yield. A maximum CO(2) conversion of 45.8% and multiple recycling stability of the catalyst were achieved, showing no significant decrease in CO(2) conversion.
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spelling pubmed-98507042023-02-07 Reverse water gas shift reaction over a Cu/ZnO catalyst supported on regenerated spent bleaching earth (RSBE) in a slurry reactor: the effect of the Cu/Zn ratio on the catalytic activity Phey Phey, Melissa Low Tuan Abdullah, Tuan Amran Md Ali, Umi Fazara Mohamud, Mohamed Yusuf Ikram, Muhammad Nabgan, Walid RSC Adv Chemistry The catalytic conversion of CO(2)via the Reverse Water Gas Shift (RWGS) reaction for CO production is a promising environment-friendly approach. The greenhouse gas emissions from burning fossil fuels can be used to produce valuable fuels or chemicals through CO(2) hydrogenation. Therefore, this project was to study the CO(2) conversion via RWGS over various Cu/ZnO catalysts supported by regenerated spent bleaching earth (RSBE) prepared by wet impregnation technique with different Cu : Zn ratios (0.5, 1.0, 1.5, 2.0, 3.0). The causes of environmental pollution from the disposal of spent bleaching earth (SBE) from an edible oil refinery can be eliminated by using it as catalyst support after the regeneration process. The synthesized catalysts were characterized by thermogravimetric analysis (TGA), X-ray diffraction (XRD), temperature-programmed reduction of hydrogen (TPR-H(2)), pyridine-adsorbed Fourier transform infrared (FTIR-pyridine), temperature programmed desorption of carbon dioxide (TPD-CO(2)), N(2) physisorption, and Fourier transform infrared (FTIR) analysis. The RWGS reaction was carried out in a slurry reactor at 200 °C, with a pressure of 3 MPa, a residence time of 4 h, and catalyst loading of 1.0 g with an H(2)/CO(2) ratio of 3. According to experimental data, the Cu/Zn ratio significantly impacts the catalytic structure and performance. The catalytic activity increased until the Cu : Zn ratio reached the maximum value of 1.5, while a further increase in Cu/Zn ratio inhibited the catalytic performance. The CZR3 catalyst (Cu/Zn ratio of 1.5) with a higher catalytic reducibility, high copper dispersion with small crystalline size, lower total pore volume as well as higher basicity showed superior catalytic performance in terms of CO(2) conversion (40.67%) and CO yield (39.91%). Findings on the effect of reaction conditions revealed that higher temperature (>240 °C), higher pressure (>3 MPa), higher reaction time (>4 h) and higher catalyst loading (>1.25 g) could improve CO(2) conversion to CO yield. A maximum CO(2) conversion of 45.8% and multiple recycling stability of the catalyst were achieved, showing no significant decrease in CO(2) conversion. The Royal Society of Chemistry 2023-01-19 /pmc/articles/PMC9850704/ /pubmed/36756434 http://dx.doi.org/10.1039/d2ra07617a Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/
spellingShingle Chemistry
Phey Phey, Melissa Low
Tuan Abdullah, Tuan Amran
Md Ali, Umi Fazara
Mohamud, Mohamed Yusuf
Ikram, Muhammad
Nabgan, Walid
Reverse water gas shift reaction over a Cu/ZnO catalyst supported on regenerated spent bleaching earth (RSBE) in a slurry reactor: the effect of the Cu/Zn ratio on the catalytic activity
title Reverse water gas shift reaction over a Cu/ZnO catalyst supported on regenerated spent bleaching earth (RSBE) in a slurry reactor: the effect of the Cu/Zn ratio on the catalytic activity
title_full Reverse water gas shift reaction over a Cu/ZnO catalyst supported on regenerated spent bleaching earth (RSBE) in a slurry reactor: the effect of the Cu/Zn ratio on the catalytic activity
title_fullStr Reverse water gas shift reaction over a Cu/ZnO catalyst supported on regenerated spent bleaching earth (RSBE) in a slurry reactor: the effect of the Cu/Zn ratio on the catalytic activity
title_full_unstemmed Reverse water gas shift reaction over a Cu/ZnO catalyst supported on regenerated spent bleaching earth (RSBE) in a slurry reactor: the effect of the Cu/Zn ratio on the catalytic activity
title_short Reverse water gas shift reaction over a Cu/ZnO catalyst supported on regenerated spent bleaching earth (RSBE) in a slurry reactor: the effect of the Cu/Zn ratio on the catalytic activity
title_sort reverse water gas shift reaction over a cu/zno catalyst supported on regenerated spent bleaching earth (rsbe) in a slurry reactor: the effect of the cu/zn ratio on the catalytic activity
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9850704/
https://www.ncbi.nlm.nih.gov/pubmed/36756434
http://dx.doi.org/10.1039/d2ra07617a
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