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Growth of mordenite on monoliths by secondary synthesis: Effects of the substrate on the coating structure and catalytic activity

Paper ID Volume ID Publish Year Pages File Format Full-Text
44517 46037 2006 13 PDF Available
Title
Growth of mordenite on monoliths by secondary synthesis: Effects of the substrate on the coating structure and catalytic activity
Abstract

Mordenite films were grown on FeCrAl alloy, CSi foam, and cordierite monoliths in order to study the influence of chemical and physical characteristics of the support on the structure of the coatings and its catalytic activity for the SCR of NOx with CH4 as test reaction, using In as the active ingredient. The method of secondary synthesis from nanometric seeds was selected because of the higher coating homogeneities achieved. The FeCrAl alloy and cordierite yielded ordered crystals growths, preferentially with the b-axis perpendicular to the metallic surface, and with the c-axis perpendicular to the cordierite support, respectively. While high crystal intergrowth was observed for the FeCrAl alloy, in the cordierite case it was limited to the interphase. The CSi foam yielded disordered film structures, forming a dense phase in the shape of cumulus laying at the top of mordenite crystals with high intergrowth. The differences are mainly attributed to chemical characteristics that originate different local environments in which the seeds are immersed and the growth takes place, the topography of the substrates not being so important. The order in maximum NOx conversions was InHMOR/FeCrAl > InHMOR/cordierite > InHMOR powder > InHMOR/CSi, and it can be related, among other factors, to the accessibility of the reactants to the active sites.

Keywords
In-mordenite; Hydrothermal synthesis; Monoliths; SCR of NOx with CH4
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Growth of mordenite on monoliths by secondary synthesis: Effects of the substrate on the coating structure and catalytic activity
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 314, Issue 1, 25 October 2006, Pages 101–113
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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