Water-Gas Shift Kinetics Over Iron Oxide Catalysts at Membrane Reactor Conditions

Lund, C.R.F.

doi:10.2172/803841

Cited by 12 publications

(6 citation statements)

References 13 publications

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“…Commercial catalyst formulations containing iron oxide were recently found to deactivate in CO 2 -rich gases. 6 In this work, we examine Cu-containing ceria catalysts as an alternative to the commercial ironchrome HTS catalysts. For comparison, we also prepared and studied iron oxide-containing ceria catalysts.…”

Section: Introductionmentioning

confidence: 99%

Activity and Stability of Cu−CeO₂ Catalysts in High-Temperature Water−Gas Shift for Fuel-Cell Applications

Flytzani‐Stephanopoulos

2004

Ind. Eng. Chem. Res.

143

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Copper-containing cerium oxide materials are shown in this work to be suitable for the hightemperature water-gas shift (WGS) reaction integrated with hydrogen separation in a membrane reactor to generate pure hydrogen. Copper-ceria is a stable high-temperature shift catalyst, unlike iron-chrome catalysts that deactivate severely in CO 2 -rich gases. Such gas mixtures will prevail if a catalytic membrane reactor is used to remove hydrogen. We also found that iron oxide-ceria catalysts have much lower activities than copper-ceria catalysts. Ceria participates in the WGS reaction; its surface properties are crucial for high activity and are sensitive to the presence of dopants. The kinetics of the WGS reaction over 10 atom % Cu-Ce-(30 atom % La)O x were measured in the temperature range 300-450 °C. A strong dependence on CO and a weak dependence on H 2 O were found at 450 °C, whereas inhibition by the reaction products was weak. The apparent activation energy over the catalyst stabilized in the reaction gas mixture at 450 °C is 70 kJ/mol. The catalyst lost some activity in the initial time on stream but was stabilized thereafter. A loss of catalyst surface area (∼20%) and copper enrichment of the ceria surface during the WGS reaction at 450 °C can explain the observed activity loss.

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Section: Introductionmentioning

confidence: 99%

Activity and Stability of Cu−CeO₂ Catalysts in High-Temperature Water−Gas Shift for Fuel-Cell Applications

Flytzani‐Stephanopoulos

2004

Ind. Eng. Chem. Res.

143

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“…According to Lund (2002), the excess water vapour in the reactor feed, which operates the WGSR, has two main effects: increased equilibrium conversion and coke formation. Since the reaction is mildly exothermic and typically occurs under adiabatic conditions by increasing the water in the reactant feed at a lower temperature, a higher catalyst bed is required (Oliveira, 2012).…”

Section: Effect Of Feed Water Vapour Concentrationmentioning

confidence: 99%

LOW-TEMPERATURE WATER-GAS SHIFT REACTION WITH RU/TiO2 AND Ru/Al2O3 CATALYSTS

Queiroz

Barbosa

Abreu

2016

BJPG

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This study investigates the catalytic performance of Ru/TiO 2 and Ru/Al 2 O 3 in the water-gas shift reaction (WGSR) at low temperatures. The catalysts were prepared and characterized, and their properties were related to their performances. The catalytic activity was determined with the WGS reaction, using the feed gas with 11% CO, 22.72% H 2 O, and 66.28% argon at 453-573 K. In presence of the Ru/Al 2 O 3 catalyst, it was found that the water feeding content led to beneficial effects on the catalytic activity. An 82% CO conversion was achieved in the WGS processing with the Ru/TiO 2 catalyst, under steady state, at 573 K.

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“…the 10%Cu-Ce(8%La)O x is more active than C12-4-02, which is superior to 13%Fe-Ce(8%La)O x . Lund et al 3 have reported a dramatic poisoning effect of CO 2 on iron oxide-based catalysts, whereby the reaction rate decreased by several orders of magnitude in CO 2 -rich gas. Cu-ceria, on the other hand, shows very good activity, reaching equilibrium CO conversions above 450 o C, in the simulated coal gas mixture and at high space velocity (80,000 h -1 , NTP), Figure 4.…”

Section: Identification Of Most Active and Stable Catalyst Compositionmentioning

confidence: 99%

Water-Gas Shift With Integrated Hydrogen Separation Process

Flytzani‐Stephanopoulos¹,

Qi²,

Kronewitter³

2004

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This project involved fundamental research and development of novel cerium oxide-based catalysts for the water-gas-shift reaction and the integration of these catalysts with Pd-alloy H 2-separation membranes supplying high purity hydrogen for fuel cell use. Conditions matching the requirements of coal gasifier-exit gas streams were examined in the project. Cu-cerium oxide was identified as the most promising high-temperature water-gas shift catalyst for integration with H 2-selective membranes. Formulations containing iron oxide were found to deactivate in the presence of CO 2. Cu-containing ceria catalysts, on the other hand, showed high stability in CO 2rich gases. This type gas will be present over much of the catalyst, as the membrane removes the hydrogen produced from the shift reaction.

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Water-Gas Shift Kinetics Over Iron Oxide Catalysts at Membrane Reactor Conditions

Cited by 12 publications

References 13 publications

Activity and Stability of Cu−CeO₂ Catalysts in High-Temperature Water−Gas Shift for Fuel-Cell Applications

Activity and Stability of Cu−CeO₂ Catalysts in High-Temperature Water−Gas Shift for Fuel-Cell Applications

LOW-TEMPERATURE WATER-GAS SHIFT REACTION WITH RU/TiO2 AND Ru/Al2O3 CATALYSTS

Water-Gas Shift With Integrated Hydrogen Separation Process

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Water-Gas Shift Kinetics Over Iron Oxide Catalysts at Membrane Reactor Conditions

Cited by 12 publications

References 13 publications

Activity and Stability of Cu−CeO2 Catalysts in High-Temperature Water−Gas Shift for Fuel-Cell Applications

Activity and Stability of Cu−CeO2 Catalysts in High-Temperature Water−Gas Shift for Fuel-Cell Applications

LOW-TEMPERATURE WATER-GAS SHIFT REACTION WITH RU/TiO2 AND Ru/Al2O3 CATALYSTS

Water-Gas Shift With Integrated Hydrogen Separation Process

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Activity and Stability of Cu−CeO₂ Catalysts in High-Temperature Water−Gas Shift for Fuel-Cell Applications

Activity and Stability of Cu−CeO₂ Catalysts in High-Temperature Water−Gas Shift for Fuel-Cell Applications