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The role of extra-framework chromium species for the catalytic activity of [Cr]APO-5-type materials

Paper ID Volume ID Publish Year Pages File Format Full-Text
52802 46887 2007 6 PDF Available
Title
The role of extra-framework chromium species for the catalytic activity of [Cr]APO-5-type materials
Abstract

The properties of chromium-substituted aluminophosphate-5 ([Cr]APO-5) with and without extra-framework chromium generated during hydrothermal synthesis are compared with those of AlPO-5 and [Cr]APO-5 into which chromium species were partly or exclusively introduced by impregnation. The prepared materials were characterized by elemental analysis, XRD, UV–Vis spectroscopy and nitrogen adsorption. Extra-framework chromium species exhibit a slight activity for the acid-catalyzed gas-phase conversion of 2-propanol to propene. However, their major effect consists in a reduction of the specific pore volume and, thus, a decreased accessibility of acid sites in [Cr]APO-5 or AlPO-5. This pore volume reduction is more pronounced for materials with extra-framework chromium species from impregnation than from generation during synthesis.

Keywords
[Cr]APO-5; UV–Vis spectroscopy; Extra-framework species; 2-propanol conversion; Acid sites
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The role of extra-framework chromium species for the catalytic activity of [Cr]APO-5-type materials
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 8, Issue 1, January 2007, Pages 91–96
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
You save - $31
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