STRUCTURAL ASPECTS and SURFACE PROPERTIES MOLYBDENUM /COMPOSITE OXIDE CATALYTS | ||||
| The International Conference on Chemical and Environmental Engineering | ||||
| Article 12, Volume 3, 3rd International Conference On Chemical & Environmental Engineering, May 2006, Page 140-154 PDF (657.82 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/iccee.2006.41062 | ||||
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| Author | ||||
| Mary Riad | ||||
| Egyptian Petroleum Research Institute. | ||||
| Abstract | ||||
| 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 determined using different techniques: Fourier transform infrared spectroscopy, x-ray diffraction pattern, differential scanning calorimetery and surface properties. X-ray diffraction pattern exhibited the formation of MgMoO4 phase on the surface of alumina-magnesia support with small crystallite size. Bulky crystallites Cr2(MoO4)3 were formed on alumina-chromia support. The thermal decomposition data confirmed the formation of MoO2 (200-230oC), Cr2(MoO4)3 (230-280oC), MoO3 (400-450oC) and MgMoO4 (450-550oC) phases. Surface properties indicate that, the bulky crystallites formed on the surface of alumina-chromia support, caused blocking of its pores and led to a significant decrease in surface area from 240.2 m2/g for Mo/alumina-magnesia to 91.04 m2/g for Mo/alumina-chromia catalyst. | ||||
| Keywords | ||||
| molybdenum; Support; Catalyst; Alumina; Magnesia; Chromia Composite mixed oxides | ||||
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