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Surface versus bulk alkali promotion of cobalt-oxide catalyst in soot oxidation

Paper ID Volume ID Publish Year Pages File Format Full-Text
49294 46733 2015 5 PDF Available
Title
Surface versus bulk alkali promotion of cobalt-oxide catalyst in soot oxidation
Abstract

•Location of alkali is of high importance for promotion of Co3O4 catalytic activity.•Bulk promotion leads to enhanced catalytic activity in soot combustion.•Surface doping decreases the catalytic activity in soot combustion.•Optimal catalyst lowers soot oxidation temperature by 340 °C.

The effect of surface and bulk alkali (Na, K) promotions on the cobalt-oxide catalyst activity in soot oxidation was investigated. While surface promotion does not alter the cobalt spinel structure, the introduction of alkali into the bulk leads to the formation of layered cobaltates (revealed by XRD, Raman spectroscopy and XPS). The catalytic activity was determined using the temperature programmed oxidation of model soot (Printex 80), both in tight and loose contact conditions. The alkali bulk promotion is much more effective than surface promotion in soot oxidation, lowering the soot ignition temperature by 340 °C for the most active catalyst K0.25CoO2.

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Keywords
Cobaltate; Cobalt spinel; Alkali promotion; Soot combustion; Catalyst; Oxidation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 71, 5 November 2015, Pages 37–41
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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