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Manipulation of Catalyst Structure for Molybdenum Trioxide by Chemical Etching

Published online by Cambridge University Press:  15 February 2011

H.C. Zeng
H.C. Zeng*
Affiliation:
Department of Chemical and Environmental Engineering Faculty of Engineering, National University of Singapore10 Kent Ridge Crescent, Singapore119260, Email: chezhc@nus. edu. sg
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Abstract

Chemical etching method has been frequently used in defect investigation for crystalline materials in solid-state chemistry / physics and fundamental materials research. Recently, we apply this technique into catalytic materials fabrication. In this work, crystalline catalysts of orthorhombic MoO 3 have been prepared via a vapor phase deposition method and their crystallographic structure has been affirmed by XRD and FTIR investigations. A chemical etching method has been developed for restructuring these thermally processed catalysts. Using a 0.1 M NaOH etchant, {001} and {100} plane areas of the catalysts can be significantly increased while surface steps, ledges, and terraces are created upon this etching. Moreover, alternate crystal plane combinations of either {100} and {010}, or the {001} and {010} are observed on crystal edges and rectangular etch pits in the basal planes {010}. Technological merits and the processing parameters of this new method have also been identified. Following the findings of the current work, it is believed that the chemically carved surface structures may be crucial for certain MoO 3-involving catalytic reactions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 549: Symposium FF – Advanced Catalytic Materials - 1998 , 1998 , 199
Copyright
Copyright © Materials Research Society 1999

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