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Wet impregnation of alumina-washcoated monoliths: Effect of the drying procedure on Ni distribution and on autothermal reforming activity

Paper ID Volume ID Publish Year Pages File Format Full-Text
44417 46025 2007 13 PDF Available
Title
Wet impregnation of alumina-washcoated monoliths: Effect of the drying procedure on Ni distribution and on autothermal reforming activity
Abstract

The complete preparation procedure of catalytic cordierite monoliths has been studied, from the washcoating with alumina to the deposition of Ni by wet impregnation. The effect of drying (oven, room temperature or microwaves drying) on Ni distribution was investigated by SEM, TEM, XPS and surface area measurements.The use of γ-Al2O3 suspensions of suitable particles size allows a faster alumina loading and the deposition of a washcoat layer with better adhesion properties than those obtained with boehmite precursors.The Ni distribution is strongly influenced by drying method applied to wet-impregnated monoliths. At a macroscopic scale, the Ni distribution is more homogeneous after microwaves or room temperature drying. At a microscopic scale, there is a surface enrichment of the washcoat in Ni, whatever the drying method applied. In all catalysts, the Ni is present in two forms: it is predominantly incorporated in a Ni-alumina spinel phase, but some large metal particles (10–20 nm) are also present, in a larger extent in the monoliths dried by microwaves and oven procedures.All monoliths deactivate slowly with time on stream during ATR of isooctane, but the oven-dried monoliths deactivate more markedly. Amorphous carbon film and whiskers were identified on all catalysts. The deactivation is not directly related to the total amount of deposited coke, but rather to the type of carbon and to Ni dispersion at both microscopic (large/small Ni particles) and macroscopic (axial Ni distribution in the channels) scales.

Graphical abstractThe preparation procedure of catalytic cordierite monoliths was studied, from the washcoating with alumina to the deposition of Ni by wet impregnation. The effect of drying (oven, room temperature or microwaves drying) on Ni distribution was investigated, and the monoliths were characterised by various techniques. The monolithic catalysts were tested in autothermal reforming of isooctane and the coke deposits characterised.Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Monolith; Alumina washcoat; Ni catalyst; Hydrogen production; Autothermal reforming
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Wet impregnation of alumina-washcoated monoliths: Effect of the drying procedure on Ni distribution and on autothermal reforming activity
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 320, 22 March 2007, Pages 43–55
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
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