High-pressure oligomerization of propene over heteropoly acids

Journal Article · Wed Jun 01 00:00:00 EDT 1994 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1006/jcat.1994.1161· OSTI ID:7275846

Vaughan, J S; O'Connor, C T; Fletcher, J C.Q. ^[1]

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1. Univ. of Cape Town, Rondebosch (South Africa)

Ammonium, potassium, nickel, copper, cobalt, iron, cerium, and aluminium salts of 12-tungstophosphoric acid (HPW) as well as the ammonium and aluminium salts of 12-tungstosilicic acid have been synthesized and characterized by TG-DTA, nitrogen adsorption, XRD, electron microscopy, ammonia temperature programmed desorption, and FTIR. Consistent with the findings of other heteropolyacid (HPA) characterization studies the HPAs could be divided into two types: Type A, low surface area salts with multiple endothermic mass losses, and Type B, high surface area salts with a single endothermic mass loss. The surface acidity of some of these catalysts was evaluated using butane cracking and butene isomerization as probe reactions. These indicated that the Type B salts had strong acid sites on the surface as they were inactive for these reactions. The propene oligomerization activity of the HPW salts decreased in the order: Al [much gt] Co > Ni, NiH, NH[sub 4] > H, Cu > Fe, Ce > K. 64 refs., 13 figs., 7 tabs.

• OSTI ID: 7275846
• Journal Information: Journal of Catalysis; (United States), Vol. 147:2; ISSN 0021-9517
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
02 PETROLEUM
HETEROPOLY ACIDS
CATALYTIC EFFECTS
PROPYLENE
POLYMERIZATION
ABSORPTION
ABSORPTION SPECTROSCOPY
ALUMINIUM COMPOUNDS
AMMONIUM COMPOUNDS
BUTANE
CATALYTIC CRACKING
CERIUM COMPOUNDS
COBALT COMPOUNDS
COPPER COMPOUNDS
DESORPTION
DIFFERENTIAL THERMAL ANALYSIS
HYDRIDES
IRON COMPOUNDS
ISOMERIZATION
NICKEL COMPOUNDS
NICKEL HYDRIDES
POTASSIUM COMPOUNDS
THERMAL GRAVIMETRIC ANALYSIS
TUNGSTEN COMPOUNDS
ALKALI METAL COMPOUNDS
ALKANES
ALKENES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
CRACKING
DECOMPOSITION
GRAVIMETRIC ANALYSIS
HYDROCARBONS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
ORGANIC COMPOUNDS
PYROLYSIS
QUANTITATIVE CHEMICAL ANALYSIS
RARE EARTH COMPOUNDS
REFRACTORY METAL COMPOUNDS
SORPTION
SPECTROSCOPY
THERMAL ANALYSIS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
400201* - Chemical & Physicochemical Properties
020400 - Petroleum- Processing