Bibliographic Citation
| Document | For copies of Journal Articles, please contact the Publisher or your local public or university library and refer to the information in the Resource Relation field. For copies of other documents, please see the Availability, Publisher, Research Organization, Resource Relation and/or Author (affiliation information) fields and/or Document Availability. |
|---|---|
| Title | Bismuth molybdates: preparation and catalysis |
| Creator/Author | Batist, P.A. |
| Publication Date | 1979 Aug 01 |
| OSTI Identifier | OSTI ID: 6420255 |
| Other Number(s) | Journal ID: CODEN: JCTBD |
| Resource Type | Journal Article |
| Resource Relation | Journal Name: J. Chem. Technol. Biotechnol.; (United Kingdom); Journal Volume: 29:8 |
| Research Org | Eindhoven Univ. Technol. |
| Subject | 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; BISMUTH COMPOUNDS; CATALYTIC EFFECTS; CHEMICAL PREPARATION; BUTENES; OXIDATION; MOLYBDATES; CATALYSTS; CHEMICAL REACTION KINETICS; CRYSTAL STRUCTURE; OXYGEN; SPECIFICITY; TESTING; ALKENES; CHEMICAL REACTIONS; ELEMENTS; HYDROCARBONS; KINETICS; MOLYBDENUM COMPOUNDS; NONMETALS; ORGANIC COMPOUNDS; OXYGEN COMPOUNDS; REACTION KINETICS; REFRACTORY METAL COMPOUNDS; SYNTHESIS; TRANSITION ELEMENT COMPOUNDS |
| Description/Abstract | In studies of the active species (which is thought to be Koechlinite (Bi/sub 2/MoO/sub 6/)) in such catalysts, bismuth molybdates, pure Koechlinite catalyst crystals, Bi/sub 2/Mo/sub 2/O/sub 9/ and stoichiometric and nonstoichiometric Bi/sub 2/Mo/sub 3/O/sub 12/ catalysts were very carefully prepared, characterized, and tested in the oxidation of 1-butene to butadiene (and carbon dioxide) at 400/sup 0/-460/sup 0/C in a flow reactor. Of the three bismuth molybdates, only the Koechlinite phase was active for alkene oxidation, and it is probable that terminal molybdenum octahedra, which have fewer stable O(-2) atoms than molybdenum tetrahedra, furnish the active oxygens. On this terminal layer, oxygen vacancies are next to active oxygen ions. Gaseous oxygen apparently enters the catalyst parallel to the layered structure, diffusing rapidly into the bulk, and thence perpendicularly toward the active surface layer. Separation of the alkene reaction site from the reoxidation site would explain the high catalyst selectivity. The importance of studying pure Koechlinite free of the quartz accompanying it in nature, is stressed. |
| Country of Publication | United Kingdom |
| Language | English |
| Format | Medium: X; Size: Pages: 451-466 |
| System Entry Date | 2009 Dec 17 |
Top | |