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Electron microscopy...
Electron microscopy of some molybdenum oxide phases after use as catalysts in oxidative ammonolysis and ammoxidation of toluene
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- Hansen, Staffan (author)
- Lund University,Lunds universitet,Kemiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH
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- Andersson, Arne (author)
- Lund University,Lunds universitet,Avdelningen för kemiteknik,Institutionen för processteknik och tillämpad biovetenskap,Institutioner vid LTH,Lunds Tekniska Högskola,Division of Chemical Engineering,Department of Process and Life Science Engineering,Departments at LTH,Faculty of Engineering, LTH
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(creator_code:org_t)
- Elsevier BV, 1988
- 1988
- English.
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In: Journal of Solid State Chemistry. - : Elsevier BV. - 0022-4596. ; 75:2, s. 225-243
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Abstract
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- Five molybdenum oxide samples, subjected to conditions of oxidative ammonolysis and ammoxidation of toluene at 450 and 460°C, respectively, have been characterized using X-ray diffraction, scanning and transmission electron microscopy, and specific surface area measurements. In oxidative ammonolysis, the relatively large, freshly prepared MoO3 crystals are reduced to smaller MoO2 crystals with a crystallite size of 5–30 nm. This process gives a perfectly pseudomorphous product with pores less than 5 nm. The specific surface area increases from <0.1 m2/g to almost 40 m2/g. In subsequent ammoxidation, MoO2 transforms first into orthorhombic Mo4O11 and finally into MoO3. The crystals of Mo4O11 are about 1 μm in diameter, and their formation leads to a decrease of specific surface area. The original MoO3 morphology is retained even after the sequence of transformation as follows: MoO3 → MoO2 → Mo4O11 (→MoO3). In some cases, the new generation of MoO3 crystals grows parallel to the original MoO3 crystals.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Kemiteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Chemical Engineering (hsv//eng)
Publication and Content Type
- art (subject category)
- ref (subject category)
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