Modification strategies of heterogeneous catalysts for water–gas shift reactions

Abstract

Featured by high energy density, hydrogen has been deemed as a clean and renewable energy source compared with conventional fossil fuels. Water-gas shift reaction (WGSR) exhibits great potential in the...

Approaching C1 Reaction Mechanisms Using Combined Operando and Transient Analysis: A Case Study on Cu/CeO2 Catalysts during the LT-Water–Gas Shift Reaction

“…The latter proceeds via intermediates, for example, carbonates, formates, or hydroxides. 30,31,77 Furthermore, theoretical studies on pure CeO 2 (111) show a combined redox−associative route. 78 It has been challenging to find operando approaches that enable a critical assessment of the reaction mechanism.…”

“…In the literature, two main mechanisms have been proposed for the WGS reaction over metal-supported oxide catalysts: a redox mechanism and an associative one. The latter proceeds via intermediates, for example, carbonates, formates, or hydroxides. ,, Furthermore, theoretical studies on pure CeO 2 (111) show a combined redox–associative route . It has been challenging to find operando approaches that enable a critical assessment of the reaction mechanism.…”

Modification Strategies of Ni-Based Catalysts with Metal Oxides for Dry Reforming of Methane

“…CO 2 and CH 4 are two main sources of greenhouse gases released from industry and human activities, which adversely influences the natural environment and biological diversity [1][2][3][4]. A promising strategy to address the above issues is conversion of both gases into valuable products, such as syngas-a mixture of CO and H 2 , which can be further transformed into pure H 2 via separation membranes or value-added chemicals (e.g., acetic acid, methanol, oxyalcohol, dimethyl ether, and long-chain hydrocarbons) via combination reactions [5][6][7][8][9][10].…”

A Review on the Water‐Gas Shift Reaction over Nickel‐Based Catalysts

“…Supported nickel catalysts are commercially used for the methanation reaction ( , ), [31–40] methane reforming reaction [41–46] and catalytic oxidation of methane ( , ), [47] With properly controlled reaction conditions and precisely tailored catalyst structure, nickel also can catalyze both the LT‐WGS and HT‐WGS reactions with suppressed selectivity towards the CO methanation side reaction [48–63] . To date, there have been a few excellent reviews that cover many aspects of the nickel‐based catalysts for the WGS reaction, including the effect of reaction conditions, [64] reaction pathway, [65] thermodynamics and kinetics, [19] catalyst design [30,66] and structure‐activity relationships [13,16,64,67] . A variety of structural modification methods have been reported to improve the catalyst performance, such as the formation of alloy, modification of the support or addition of promoters.…”

“…[48][49][50][51][52][53][54][55][56][57][58][59][60][61][62][63] To date, there have been a few excellent reviews that cover many aspects of the nickel-based catalysts for the WGS reaction, including the effect of reaction conditions, [64] reaction pathway, [65] thermodynamics and kinetics, [19] catalyst design [30,66] and structure-activity relationships. [13,16,64,67] A variety of structural modification methods have been reported to improve the catalyst performance, such as the formation of alloy, modification of the support or addition of promoters. It is, however, interesting to notice that these efforts are often explained to aim at tuning two elementary steps: CO adsorption and H 2 O dissociation.…”