In situ FTIR and ex situ XPS/HS-LEIS study of supported Cu/Al2O3 and Cu/ZnO catalysts for CO2 hydrogenation

Hu, Jun; Li, Yangyang; Zhen, Yanping; Chen, Mingshu; Wan, Huilin

doi:10.1016/s1872-2067(20)63672-5

Cited by 105 publications

(46 citation statements)

References 67 publications

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“…The most active Cu-based catalysts are prepared by a co-precipitation method, and are composed of Cu, ZnO and Al2O3 [7,8]. The addition of metal oxide promoters could increase the catalytic activity by changing the structure and properties of the catalyst [9].…”

Section: Introductionmentioning

confidence: 99%

Effects of Al and Co Promoters on CuO/SBA-15/Kaolinite Catalyst Properties and CO₂ Hydrogenation at Low Pressure

et al. 2021

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CuO on mesoporous silica catalyst was prepared with post synthesis impregnation method, and the effects of Al and Co promoters on CuO/SBA-15/kaolinite catalyst properties and CO2 hydrogenation were studied. The mixing technology with kaolinite clay (containing Al2O3) was used to obtain the granules and to enhance the CO2 conversion to methanol as a product. The performance of all catalysts for catalytic hydrogenation of CO2 was evaluated on a fixed-bed tubular micro-activity reactor at 20 bar and 250°C with H2/CO2 molar ratio 3:1. XRD analysis, N2 adsorption-desorption analysis and SEM-EDX analysis indicated that the mesoporous structure of SBA-15 remains after loading with CuO and promoters, and after mixing with kaolinite clay. Results were compared with results obtained with commercial CuO/Al2O3 catalyst, which showed high MeOH selectivity (78%) during CO2 hydrogenation reaction.

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Section: Introductionmentioning

confidence: 99%

Effects of Al and Co Promoters on CuO/SBA-15/Kaolinite Catalyst Properties and CO₂ Hydrogenation at Low Pressure

et al. 2021

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“…On the C-H stretching region in Figure 6 b, bands can be observed at 3002, 2929, 2899-2896, 2875, 2769, and 2741 cm −1 . According to the literature, the bands at 3002 and 2769 cm −1 were assigned to bidentate formate species on Al 2 O 3 -supported catalyst [ 40 , 41 , 42 ]; however, these bands were formed on pure alumina nanorods in this study. Here, we question the formation of formate species, since no H 2 gas was passed through the sample during the first 120 min, except that certain reactions exist with OH groups on the Al 2 O 3 surface [ 37 ].…”

Section: Resultsmentioning

confidence: 54%

CO2 Activation and Hydrogenation on Cu-ZnO/Al2O3 Nanorod Catalysts: An In Situ FTIR Study

et al. 2022

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CuZnO/Al2O3 is the industrial catalyst used for methanol synthesis from syngas (CO + H2) and is also promising for the hydrogenation of CO2 to methanol. In this work, we synthesized Al2O3 nanorods (n-Al2O3) and impregnated them with the CuZnO component. The catalysts were evaluated for the hydrogenation of CO2 to methanol in a fixed-bed reactor. The support and the catalysts were characterized, including via in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). The study of the CO2 adsorption, activation, and hydrogenation using in situ DRIFT spectroscopy revealed the different roles of the catalyst components. CO2 mainly adsorbed on the n-Al2O3 support, forming carbonate species. Cu was found to facilitate H2 dissociation and further reacted with the adsorbed carbonates on the n-Al2O3 support, transforming them to formate or additional intermediates. Like the n-Al2O3 support, the ZnO component contributed to improving the CO2 adsorption, facilitating the formation of more carbonate species on the catalyst surface and enhancing the efficiency of the CO2 activation and hydrogenation into methanol. The synergistic interaction between Cu and ZnO was found to be essential to increase the space–time yield (STY) of methanol but not to improve the selectivity. The 3% CuZnO/n-Al2O3 displayed improved catalytic performance compared to 3% Cu/n-Al2O3, reaching a CO2 conversion rate of 19.8% and methanol STY rate of 1.31 mmolgcat−1h−1 at 300 °C. This study provides fundamental and new insights into the distinctive roles of the different components of commercial methanol synthesis catalysts.

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“…, can also be determined using several operando techniques by in situ methods. 180 The quasi in situ EPR technique and quasi in situ UV-Vis techniques were adopted by Lin et al in the photoreduction of CO 2 to CO using the g-C 3 N 4 /FeTCPP photocatalyst. 181 Herein, the reaction mechanism involves the photoexcitation of g-C 3 N 4 , charge transfer from g-C 3 N 4 nanosheets to FeTCPP, the formation of Fe II TCPP, [Fe II TCPP⋯CO 2 ], [Fe I TCPP⋯CO 2 ] − and [Fe 0 TCPP⋯CO 2 ] 2− intermediates, followed by CO production.…”

Section: Critical Features For Efficient Co2 Photoreductionmentioning

confidence: 99%

Challenges and prospects in the selective photoreduction of CO₂ to C1 and C2 products with nanostructured materials: a review

2022

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In situ FTIR and ex situ XPS/HS-LEIS study of supported Cu/Al2O3 and Cu/ZnO catalysts for CO2 hydrogenation

Cited by 105 publications

References 67 publications

Effects of Al and Co Promoters on CuO/SBA-15/Kaolinite Catalyst Properties and CO₂ Hydrogenation at Low Pressure

Effects of Al and Co Promoters on CuO/SBA-15/Kaolinite Catalyst Properties and CO₂ Hydrogenation at Low Pressure

CO2 Activation and Hydrogenation on Cu-ZnO/Al2O3 Nanorod Catalysts: An In Situ FTIR Study

Challenges and prospects in the selective photoreduction of CO₂ to C1 and C2 products with nanostructured materials: a review

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In situ FTIR and ex situ XPS/HS-LEIS study of supported Cu/Al2O3 and Cu/ZnO catalysts for CO2 hydrogenation

Cited by 105 publications

References 67 publications

Effects of Al and Co Promoters on CuO/SBA-15/Kaolinite Catalyst Properties and CO2 Hydrogenation at Low Pressure

Effects of Al and Co Promoters on CuO/SBA-15/Kaolinite Catalyst Properties and CO2 Hydrogenation at Low Pressure

CO2 Activation and Hydrogenation on Cu-ZnO/Al2O3 Nanorod Catalysts: An In Situ FTIR Study

Challenges and prospects in the selective photoreduction of CO2 to C1 and C2 products with nanostructured materials: a review

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Effects of Al and Co Promoters on CuO/SBA-15/Kaolinite Catalyst Properties and CO₂ Hydrogenation at Low Pressure

Effects of Al and Co Promoters on CuO/SBA-15/Kaolinite Catalyst Properties and CO₂ Hydrogenation at Low Pressure

Challenges and prospects in the selective photoreduction of CO₂ to C1 and C2 products with nanostructured materials: a review