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Kinetics of formation of chromia promoted skeletal iron catalysts for the water gas shift reaction

Paper ID Volume ID Publish Year Pages File Format Full-Text
55647 47060 2011 7 PDF Available
Title
Kinetics of formation of chromia promoted skeletal iron catalysts for the water gas shift reaction
Abstract

Particles of Fe2Al5 (60–211 μm diameter) were leached at 10, 30 and 50 °C in 3 M NaOH containing varying amounts of sodium chromate in the range 0.005–0.05 M. The kinetics of leaching was fitted to solid-state kinetic models. The model best fitting the data was the Avrami–Erofeev model −ln(1 − α)1/1.5 = kt. Apparent activation energies were in the range 60–63 kJ mol−1. The BET surface areas of the promoted materials were high, with values in the range 57–91 m2 g−1. Catalysts were tested for the water–gas-shift (WGS) reaction at 350 °C and it was found that the chromium content of the catalysts had a significant effect on the WGS activity, which went through a maximum for a catalyst containing around 2 wt% chromium.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (245 K)Download as PowerPoint slideHighlights► Chromate addition slows down the leaching kinetics of Fe2Al5. ► Cr is distributed throughout the skeletal structure of the leached material. ► Cr has a marked effect on WGS activity, suggesting it is a promoter.

Keywords
Skeletal iron; Water–gas-shift; Leaching kinetics; Iron catalyst; Chromium promotion; Fe2Al5
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Kinetics of formation of chromia promoted skeletal iron catalysts for the water gas shift reaction
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Today - Volume 178, Issue 1, 15 December 2011, Pages 103–109
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
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Price was $35.95
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