A comparative investigation of the catalytic properties of crystalline aluminosilicates of different types. 2. Selectivity in the cracking of n-octane

Journal Article · Mon Mar 01 04:00:00 EST 1982 · Bull. Acad. Sci. USSR, Div. Chem. Sci. (Engl. Transl.); (United States)

DOI:https://doi.org/10.1007/BF00949779· OSTI ID:5571841

Stepanov, V G; Mastikhin, V M; Ione, K G

This investigation examines the dependence of the rate and selectivity of the cracking of n-octane over zeolites on the state of the aluminum atoms present. To ensure the correctness of the comparative determinations of the catalytic properties of the zeolites, the contact times were varied over a range of three to four orders of magnitude. The cracking of paraffins over decationized type Y zeolites, mordenites, erionite, and high-silica zeolites (HSZ) occurs by the same route: paraffins ..-->.. unsaturated fragments ..-->.. paraffinic fragments and monoaromatic hydrocarbons ..-->.. polyalkylaromatic (nondesorbed) compounds. The extent of conversion of the intermediate products, and hence the selectivity of cracking, is determined for erionite by the geometrical parameters of the pore structure, and for type Y zeolites, mordenites, and HSZ, by the concentration of groups which include aluminum atoms in cationic positions. On type Y zeolites with greatest concentration of aluminum atoms in cationic positions, conversion of the hydrocarbons proceeds as far as the formation of nondesorbed compounds, and on HSZ with the lowest concentration of such sites, it proceeds as far as the formation of monoaromatic compounds.

• Research Organization: Academy of Sciences of the USSR, Novosibirsk
• OSTI ID: 5571841
• Journal Information: Bull. Acad. Sci. USSR, Div. Chem. Sci. (Engl. Transl.); (United States), Journal Name: Bull. Acad. Sci. USSR, Div. Chem. Sci. (Engl. Transl.); (United States) Vol. 31:3; ISSN BACCA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400* -- Petroleum-- Processing
ALKANES
ALUMINIUM COMPOUNDS
ALUMINIUM SILICATES
AROMATICS
CATALYTIC CRACKING
CATALYTIC EFFECTS
CHEMICAL REACTIONS
COMPARATIVE EVALUATIONS
CRACKING
DECOMPOSITION
HYDROCARBONS
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
MINERALS
MORDENITE
OCTANE
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PYROLYSIS
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
THERMOCHEMICAL PROCESSES
ZEOLITES