Sintering of 'shell' molybdena-alumina catalysts

Journal Article · Fri Mar 30 04:00:00 EST 1979 · J. Catal.; (United States)

DOI:https://doi.org/10.1016/0021-9517(79)90046-0· OSTI ID:7128262

Srinivasan, R; Liu, H C; Weller, S W

Catalysts containing an outer shell of molybdenum trioxide were prepared by impregnating Houdry 2005 alumina (0.39 cc/g pore volume) with ammonium molybdate solution by the no-excess-solution technique. Sintering of these catalysts in air at 750/sup 0/-925/sup 0/C for 1-6 hr led to an increased average pore size, a change from bimodel to unimodal pore distributions, and an increase in pore volume to 0.49 cc/g. Below 850/sup 0/C, the molybdena shell inner boundary migrated towards the pellet center. Volatilization of the molybdena occurred at higher temperatures. The molybdena specific surface area, as measured by oxygen adsorption, decreased over the entire range of sintering temperatures. The migration of the molybdena shell was measured microscopically after reducing the molybdena to the visible blue molybdenum(V) oxide with hydrazine or hydrogen.

• Research Organization: State Univ. of New York, Buffalo
• OSTI ID: 7128262
• Journal Information: J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 57:1; ISSN JCTLA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADSORPTION
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL COATING
CHEMICAL PREPARATION
DEPOSITION
ELEMENTS
FABRICATION
MOLYBDENUM COMPOUNDS
MOLYBDENUM OXIDES
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
POROSITY
SINTERING
SORPTION
SORPTIVE PROPERTIES
SURFACE COATING
SURFACE PROPERTIES
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
VERY HIGH TEMPERATURE