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Characterization of redox and acid properties of mesoporous Cr–TiO2 and its efficient performance for oxidative dehydrogenation of propane

Paper ID Volume ID Publish Year Pages File Format Full-Text
40967 45872 2012 10 PDF Available
Title
Characterization of redox and acid properties of mesoporous Cr–TiO2 and its efficient performance for oxidative dehydrogenation of propane
Abstract

Mesoporous Cr–TiO2 materials with chromium content from 0.02 to 0.30 (Cr/Ti molar ratio) were synthesized using a nonionic Pluronic F127 surfactant, and the mesostructure was confirmed by BET, SAXS and TEM. The stability of the mesoporous structure under the atmospheres of propane oxidative dehydrogenation (PODH) and air was investigated. The variety in valence states and the distribution of Cr species on the surface were also evaluated by WXRD, XPS, UV–vis and H2-TPR methods. The acid properties including kinds, number and strength were measured by NH3-TPD and IR-Py experiment. Propane oxidative dehydrogenation to propylene employed as a probe reaction suggested that the catalytic performance relates closely with the content of Cr, the easily reducible soluble Cr species, and the modification of the acid properties on the surface, while TiCr0.15 catalyst performs good conversion and selectivity, with a yield of propylene near 19%.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (105 K)Download as PowerPoint slideHighlights► Mesoporous Cr–TiO2 materials with high content of Cr have been synthesized. ► They exhibit high catalytic activity in propane oxidative dehydrogenation. ► Cr3+ was related to propane conversion and Cr6+ to the selectivity. ► The mesoporous structure is beneficial for the dispersion of Cr species and could modulate the acid properties.

Keywords
Mesoporous material; Redox process; Acid properties; Propane oxidative dehydrogenation
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Characterization of redox and acid properties of mesoporous Cr–TiO2 and its efficient performance for oxidative dehydrogenation of propane
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 427–428, 15 June 2012, Pages 145–154
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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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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Any Questions? feel free to contact us