Catalytic behavior of AMoO{sub x} (A = Ba, Sr) in oxidation of 2-propanol
Journal Article
·
· Materials Research Bulletin
- Catalysis Research Center, Hokkaido University, N21-W10, 001-0021 Sapporo (Japan)
Perovskite-type oxides, BaMoO{sub 3} and SrMoO{sub 3}, were prepared by reduction of scheelite-type oxides, BaMoO{sub 4} and SrMoO{sub 4}, in H{sub 2} flow at 873 K and characterized by XRD, TG, SEM, TPR, NH{sub 3}-TPD, UV-vis DRS and BET measurement. The catalytic activity of these alkaline-earth molybdenum oxide catalysts was tested for oxidation of 2-propanol with gaseous oxygen under atmospheric pressure. Dehydration to propylene was mainly promoted over the scheelite-type with Mo{sup 6+}, while oxidative dehydrogenation to acetone was mainly promoted over the perovskite-type with Mo{sup 4+}, and selectivity to acetone was much higher over BaMoO{sub 3} than over SrMoO{sub 3}. Both perovskite-type oxide catalysts underwent oxidation to some degree during the catalytic reaction, so that they also contained some Mo{sup 6+}. We concluded that the high selectivity to acetone resulting from oxidative dehydrogenation during 2-propanol conversion is related to the constantly changing oxidation state of the catalyst, resulting in coexistence of Mo{sup 6+} octahedra and Mo{sup 4+} octahedra on the AMoO{sub 3} oxides.
- OSTI ID:
- 21199743
- Journal Information:
- Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 4 Vol. 44; ISSN MRBUAC; ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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