Electron microscopy of some molybdenum oxide phases after use as catalysts in oxidative ammonolysis and ammoxidation of toluene
(1988) In Journal of Solid State Chemistry 75(2). p.225-243- Abstract
- 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... (More)
- 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. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/3914639
- author
- Hansen, Staffan LU and Andersson, Arne LU
- organization
- publishing date
- 1988
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Journal of Solid State Chemistry
- volume
- 75
- issue
- 2
- pages
- 225 - 243
- publisher
- Elsevier
- external identifiers
-
- wos:A1988P749200002
- scopus:0024064167
- ISSN
- 0022-4596
- DOI
- 10.1016/0022-4596(88)90162-4
- language
- English
- LU publication?
- yes
- id
- 90dc622f-435b-48a8-b106-3008ba1b7a25 (old id 3914639)
- date added to LUP
- 2016-04-01 15:39:07
- date last changed
- 2023-09-04 04:46:52
@article{90dc622f-435b-48a8-b106-3008ba1b7a25, abstract = {{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.}}, author = {{Hansen, Staffan and Andersson, Arne}}, issn = {{0022-4596}}, language = {{eng}}, number = {{2}}, pages = {{225--243}}, publisher = {{Elsevier}}, series = {{Journal of Solid State Chemistry}}, title = {{Electron microscopy of some molybdenum oxide phases after use as catalysts in oxidative ammonolysis and ammoxidation of toluene}}, url = {{http://dx.doi.org/10.1016/0022-4596(88)90162-4}}, doi = {{10.1016/0022-4596(88)90162-4}}, volume = {{75}}, year = {{1988}}, }