Water–Gas Shift Reaction over Ni/CeO2 Catalysts

Ludmilla Bobrova,Vladislav Sadykov,Mikhail Simonov,Eugene Ivanov,Lev Makarshin,Dmitry Andreev,Alexander Gribovskii,Natalia Mezentseva

doi:10.3390/catal7100310

Ludmilla Bobrova, Vladislav Sadykov + Show 6 more

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https://doi.org/10.3390/catal7100310

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Abstract

This paper reports the results of a study of a water–gas shift reaction over nickel–ceria catalysts with different metal loading. Within this study, the overall CO conversion and observed kinetic behavior were investigated over the temperature range of 250–550 °C in different reactor configurations (fixed-bed and microchannel reactors). The quasi-steady state kinetics of the CO water–gas shift reaction was studied for fractions of Ni-containing cerium oxide catalysts in fixed-bed experiments at lab-scale level using a very dilute gas (1% CO + 1.8% H2O in Не). A set of experiments with a microchannel reactor was performed using the feed composition (CO:H2O:H2:N2 = 1:2:2:2), representing a product gas from methane partial oxidation. The results were interpreted using computational models. The kinetic parameters were determined by regression analysis, while mechanistic aspects were considered only briefly. Simulation of the WGS reaction in the microreactor was also carried out by using the COMSOL Multiphysics program.

Highlights

Electricity and hydrogen are considered as the dominant energy carriers in modern green chemical and process engineering
The water–gas shift reaction (WGS) is the preferred chemical reaction applied in the syngas cleaning and conditioning stages to remove toxic CO and produce H2 along with CO2 prior to using a syngas product stream in different applications
This paper reports results of a study of the water–gas shift reaction over nickel–ceria catalysts with different metal loading at temperatures in the range of 250–550 ◦ C

Summary

Introduction

Electricity and hydrogen are considered as the dominant energy carriers in modern green chemical and process engineering. Syngas, being composed of hydrogen and carbon monoxide, is considered an alternative to conventional fuels in all its applications. It can be burned like natural gas, used as a source of hydrogen for fuel cells, or transformed into other hydrocarbon fuels. The composition of syngas varies depending on operational conditions and technologies used. The water–gas shift reaction (WGS) is the preferred chemical reaction applied in the syngas cleaning and conditioning stages to remove toxic CO and produce H2 along with CO2 prior to using a syngas product stream in different applications.

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