Influence of impregnation conditions on formation of MoO/sub 3/-Al/sub 2/O/sub 3/ system in hydrotreating catalysts

Journal Article · Sun Jan 01 04:00:00 EST 1984 · Chem. Technol. Fuels Oils (Engl. Transl.); (United States)

OSTI ID:6727508

Irisova, K N; Abramkina, N P; Nefedov, B K; Smirnov, V K

This article investigates the influence of the concentration and pH of the impregnating solution of ammonium molybdate and the characteristics of the aluminium oxide pore structure on the process of MoO/sub 3/ accumulation on the support. The introduction of active components by impregnating a support with aqueous solutions of compounds of these components is widely used in the manufacture of hydrotreating catalysts. The impregnation was performed by adding 500 ml of aqueous ammonium molybdate solution to 100 cm/sup 3/ of the support in a tightly closed flask. The results show that the highest rate of MoO/sub 3/ accumulation on the supports corresponds to an impregnation time of 0.5-1 /SUP h/ . Weight losses following an exo-effect is observed in the region of temperatures corresponding to sublimation of MoO/sub 3/ from the surface of the MoO/sub 3/-Al/sub 2/O/sub 3/ systems. It is determined that when MoO/sub 3/ is introduced into aluminium oxide by impregnating calcined granules with an ammonium molybdate solution (with MoO/sub 3/ concentration 135-173 g/liter and pH 5.6-6.9), the MoO/sub 3/ content depends on the length of the impregnation period and the pH of the solution to a greater degree than it depends on the concentration. Includes 4 tables.

• Research Organization: All-Union Sci.-Res. Inst. for Petroleum Processing
• OSTI ID: 6727508
• Journal Information: Chem. Technol. Fuels Oils (Engl. Transl.); (United States), Journal Name: Chem. Technol. Fuels Oils (Engl. Transl.); (United States) Vol. 19:5-6; ISSN CTFOA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
AMMONIUM COMPOUNDS
AQUEOUS SOLUTIONS
CALCINATION
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
CRACKING
DECOMPOSITION
DISPERSIONS
EVAPORATION
GRANULAR MATERIALS
HYDROCRACKING
IMPREGNATION
MATERIALS
MIXTURES
MOLYBDATES
MOLYBDENUM COMPOUNDS
MOLYBDENUM OXIDES
OXIDES
OXYGEN COMPOUNDS
PH VALUE
PHASE TRANSFORMATIONS
POROSITY
PYROLYSIS
QUANTITY RATIO
SOLUTIONS
SUBLIMATION
SYNTHESIS
THERMOCHEMICAL PROCESSES
TIME DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
WEIGHT MEASUREMENT