Structural Aspects and Surface Properties Molybdenum /Composite Oxide Catalysts

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Structural Aspects and Surface Properties  Molybdenum /Composite Oxide Catalysts

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Abstract

Molybdenum / composite oxide catalysts play an important role in dehydrogenation -hydrogenation process. In the present investigation, alumina-magnesia and aluminachromia composite materials were used as supports. The structural and phase changes of the prepared catalysts were confirmed using different techniques: Fourier transformer infrared spectroscopy, x-ray diffraction pattern, differential scanning calorimetery and surface properties. X-ray diffraction pattern exhibited the formation of MgMoO 4 phase on the surface of alumina-magnesia support with small crystallite size. Bulky crystallites of MoO 3 and Cr 2 (MoO 4 ) 3 were formed on alumina-chromia support. The thermal decomposition data emphasized the formation of Cr 2 (MoO 4 ) 3 (230-280 o C), MoO 3 (400-450 o C) and MgMoO 4 (350-500 o C) phases. Surface properties indicate that, the bulky crystallites formed on the surface of alumina-chromia support, caused blocking of its pores and lead to an observed decrease in surface area from 240.2 m 2 /g for Mo/alumina-magnesia to 91.04 m 2 /g for Mo/alumina-chromia catalysts.

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Funding

No external funding was declared for this work.

Conflict of Interest

The authors declare no conflict of interest.

Ethical Approval

No ethics committee approval was required for this article type.

Data Availability

Not applicable for this article.

How to Cite This Article

Dr. M.Riad. . "Structural Aspects and Surface Properties Molybdenum /Composite Oxide Catalysts". Global Journal of Research in Engineering GJRE Volume 10 (GJRE Volume 10 Issue 6).

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Journal Specifications

Crossref Journal DOI 10.17406/gjre

Print ISSN 0975-5861

e-ISSN 2249-4596

Keywords
Version of record

v1.2

Issue date
November 10, 2010

Language
English
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Structural Aspects and Surface Properties Molybdenum /Composite Oxide Catalysts

Dr. M.Riad
Dr. M.Riad Egyptian petroleum research institute