Mechanism of the reverse water gas shift reaction over Cu/ZnO catalyst*1

Fujita, Shin‐ichiro; Usui, Masahito; Takezawa, Nobutsune

doi:10.1016/0021-9517(92)90223-5

Cited by 159 publications

(58 citation statements)

References 25 publications

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“…The reverse water-gas shift reaction (RWGS) proposed by Prairie et aL (1991a) on the basis that the steady-state (CO),, concentration is negatively influenced by H20 is consistent with the observed H 2 and H20 effect in the transient step-up experiments. The mechanism of the RWGS is thought to either go through a formate intermediate (Schild et al, 1991;Shido and lwasawa, 1993) or through a "'surface redox" process (Ernst et al, 1992;Fujita et al, 1992). Spectroscopic surface experiments performed in this system where (HCOO-),, surface adsorbates are measured tend to favor the formate mechanism in the following form:…”

Section: Discussionmentioning

confidence: 99%

Transient drift spectroscopy for the determination of the surface reaction kinetics of CO methanation

MARWOOD

DOEPPER

PRAIRIE

et al. 1994

Chemical Engineering Science

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Abstract--Transient experiments were applied to the study of the adsorbed CO intermediate, (CO),,, formed during the CO2 methanation reaction on a 2% Ru/TiO2 catalyst at 383 K.Step-up experiments showed that the (CO),, formation steps are inhibited by H20 and enhanced by H 2.Step-down experiments showed that the (CO),, hydrogenation is not influenced by the partial pressure of water. Based on the fact that water inhibits the overall CO 2 methanation, it is deduced that the rate limiting process in the overall reaction is (CO),, formation.

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Section: Discussionmentioning

confidence: 99%

Transient drift spectroscopy for the determination of the surface reaction kinetics of CO methanation

MARWOOD

DOEPPER

PRAIRIE

et al. 1994

Chemical Engineering Science

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“…These results confirm that there must be some other factors affecting the catalytic performance during the synthesis of methanol from CO2/H2. Apparently, Cu 0 atoms are the active sites in the dissociation of CO2 to CO and Cu-O-Cu species [50][51][52][53]. The dissociation reaction is the follows:…”

Section: Xrd Analysismentioning

confidence: 99%

Operating Conditions and Composition Effect on the Hydrogenation of Carbon Dioxide Performed over CuO/ZnO/Al2O3 Catalysts

Allam

Cheknoun

Hocine

2019

Bull. Chem. React. Eng. Catal.

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A series of catalysts constituted of mixed copper and zinc oxides supported on alumina were prepared by co-precipitation method. The cooper content was in the 10-90 wt.% range. Their catalytic behavior in the hydrogenation of carbon dioxide to methanol was investigated at high pressure (up to 75 bars). The catalysts were characterized by elemental analysis, N2-adsorption, N2O-chemisorptions, and X-ray diffraction (XRD). The catalysts showed a clear activity in the hydrogenation reaction that could be correlated to the surface area of the metallic copper and to the reaction pressure. The CuO/ZnO/Al2O3 catalyst with a Cu/Zn/Al weight ratio of 60/30/10, exhibits the highest carbon dioxide conversion and methanol selectivity. Finally, a mechanism pathway has been proposed on copper active sites of (Cu 0 /Cu I ) oxidation state.

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“…Cu 0 atoms are certainly active to disassociate CO 2 , while the reduction of oxidized Cu catalyst has to be quicker than the process of oxidation [32,33]. Hence, hydrogen is suggested to be a reducing reagent without direct involvement in the intermediates formation in the reverse-water-gas-shift reaction.…”

Section: Reaction Mechanismmentioning

confidence: 99%

A Brief Review of Carbon Dioxide Hydrogenation to Methanol Over Copper and Iron Based Catalysts

Tursunov

Кustov

Kustov

2017

Oil & Gas Science and Technology - Rev. IFP Energies nouvel

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-Climate change and global warming have become a challenging issue affecting not only humanity but also flora and fauna due to an intense increase of CO 2 emission in the atmosphere which has gradually led to amplification in the average global temperature. Hence, a number of mechanisms have been promoted to diminish the atmospheric commutation of carbon dioxide. One of the well-known techniques is Carbon Capture and Storage (CCS) which mechanism is based on capture and storage vast quantities of CO 2 , as well as Carbon Capture and Utilization (CCU) which mechanism is based on CO 2 conversion to liquid fuels (e.g. methanol, hydrocarbons, carbonate, propylene, dimethyl ether, ethylene, etc.). Particularly, methanol (CH 3 OH) is a key feedstock for industrial chemicals, which further can be converted into high molecular alternative liquid fuels. In this regard, hydrogenation of CO 2 is one of the promising, effectual and economic techniques for utilization of CO 2 emission. Nevertheless, the reduction/activation of CO 2 into useful liquid products is a scientifically challenging issue due to the complexities associated with its high stability. Thus, various catalysts have been applied to reduce the activation energy of the hydrogenation process and transform CO 2 into value-added products. Thereby, this review article highlights the progress and the recent advances of research investigation in Cu and Fe-based catalytic conversion of CO 2 , reaction mechanisms, catalytic reactivity, and influence of operating parameters on product efficiency.

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Mechanism of the reverse water gas shift reaction over Cu/ZnO catalyst*1

Cited by 159 publications

References 25 publications

Transient drift spectroscopy for the determination of the surface reaction kinetics of CO methanation

Transient drift spectroscopy for the determination of the surface reaction kinetics of CO methanation

Operating Conditions and Composition Effect on the Hydrogenation of Carbon Dioxide Performed over CuO/ZnO/Al2O3 Catalysts

A Brief Review of Carbon Dioxide Hydrogenation to Methanol Over Copper and Iron Based Catalysts

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