Low temperature water–gas shift: Applications of a modified SSITKA–DRIFTS method under conditions of H2 co-feeding over metal/ceria and related oxides

Abstract Water gas shift reaction plays an important role in the Fischer-Tropsch synthesis reaction over iron-based catalysts. A slurry reactor model which accounted for the kinetics of both Fischer-Tropsch synthesis and water gas shift reaction was used to investigate the effects of hydrogen to carbon monoxide ratio, water vapor concentration and reactor temperature on synthesis gas conversion. The model was used to determine optimum concentration of water in the feed gas. For a given reactor temperature, the optimum concentration of water in the feed gas was found to increase with decreasing hydrogen to carbon monoxide ratio. The optimum concentration of water in the feed gas was found to decrease with increasing reactor temperature. Increasing the water gas shift reaction rate improved syngas conversion for low reaction temperatures. KEYWORDS: Fischer-Tropsch synthesisIron catalystlurry reactorWater-gas-shift reaction

Water-gas shift reaction

Fischer–Tropsch process

Gas composition

Water gas

10.1080/00986449408936242

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Citations (18)

Reverse water-gas shift reaction: steady state isotope switching study of the reverse water-gas shift reaction using in situ DRIFTS and a Pt/ceria catalyst

Applied Catalysis A General (2005)

Gary Jacobs Burtron H. Davis

Water-gas shift reaction

10.1016/j.apcata.2005.01.013

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Citations (76)

Dynamic technique to elucidate the reaction intermediate in surface catalysis. Water-gas shift reaction

Transactions of the Faraday Society (1970)

Akifumi Ueno Takaharu Onishi Kenzi Tamaru

The mechanism of the water-gas shift reaction on ZnO and MgO was studied by means of infra-red spectroscopy during the course of the reaction. When a mixture of carbon dioxide and hydrogen was introduced over ZnO, formate ion was observed. The rate of decomposition (dehydration) of the surface formate ion was measured at the reaction temperature (230°C) as a function of its concentration, and compared with the rate of the overall reaction on ZnO at the same coverage of the surface formate is the reaction intermediate of the water-gas shift reaction on ZnO and its decomposition is the rate-determining step.

Water-gas shift reaction

Reaction rate

Water gas

Dehydration reaction

10.1039/tf9706600756

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Citations (115)

Mechanistic Studies of Water–Gas-Shift Reaction on Transition Metals

The Journal of Physical Chemistry C (2011)

Chia-Hao Lin Chung-Liang Chen Jeng‐Han Wang

A density functional theory (DFT) calculation has been carried out to investigate a water–gas-shift reaction (WGSR) on a series of chemical related materials of Co, Ni, and Cu (from the 3d row); Rh, Pd, and Ag (from the 4d row); and Ir, Pt, and Au (from the 5d row). The result shows that WGSR mechanism involves the redox, carboxyl, and formate pathways, which correspond to CO* + O* → CO2(g), CO* + OH* → COOH* → CO2(g) + H*, and CO* + H* + O* → CHO* + O* → HCOO** → CO2(g) + H*, respectively. The reaction barriers in the three pathways are competitive and have a similar trend that groups 9 > 10 > 11 and 3d > 4d >5d. Thus, the bottom-right d-block metals (Cu, Pt, and Au) show better WGSR activity. The experimentally most observed formate can be attributed to its lower formation and higher dissociation barriers. Furthermore, the catalytic behavior on these active metal surfaces has been examined. The result shows that WGSR is mostly follows the redox pathway on Au(111) surface due to the negligible CO* oxidation barriers; on the other hand, all the three pathways contribute similarly in WGSR on Cu(111) and Pt(111) surfaces. Finally, the feasible steps of formyl in Fischer–Tropsch synthesis (FTS), the combustion reaction, and formate pathway, CHO* → CH* + O*, CHO* → CO* + H*, and CHO* + O* → HCOO**, respectively, have also been studied. The result shows that activities of FTS and the WGSR have opposite trends on these metal surfaces.

Water-gas shift reaction

10.1021/jp2034467

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Citations (129)

High-temperature Water–Gas Shift catalysts for hydrogen enrichment of a gas produced by biomass steam gasification

Comptes Rendus Chimie (2015)

Charlotte Lang Xavier Sécordel Yvan Zimmermann A. Kiennemann Claire Courson

Water-gas shift reaction

Water gas

Industrial gas

10.1016/j.crci.2014.12.004

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Citations (14)

In situ time-resolved characterization of novel Cu–MoO2 catalysts during the water–gas shift reaction

Catalysis Letters (2007)

Wen Wen Liu Jing Michael G. White Nebojša Marinković Jonathan C. Hanson

Water-gas shift reaction

Water gas

10.1007/s10562-006-9003-7

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Citations (32)

The Water-Gas Shift Reaction

Catalysis Reviews (1980)

David S. Newsome

Abstract The water-gas shift is a reversible, exothermic chemical reaction, usually assisted by a catalyst, and is the' reaction of steam with carbon monoxide to produce carbon dioxide and hydrogen gas

Water-gas shift reaction

Exothermic reaction

Water gas

10.1080/03602458008067535

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Citations (976)

Hydrogen from the high temperature water gas shift reaction with an industrial Fe/Cr catalyst using biomass gasification tar rich synthesis gas

Fuel Processing Technology (2015)

Simeone Chianese J. Loipersböck Markus Malits Reinhard Rauch Hermann Hofbauer

Water-gas shift reaction

Water gas

Space velocity