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Catalytic pyrolysis of hydrocarbons

Journal Article:

Abstract

Catalytic pyrolysis of petroleum fractions (undecane) was performed with the object of clarifying such questions as the mechanism of action of the catalyst, the concepts of activity and selectivity of the catalyst, the role of transport processes, the temperature ranges and limitations of the catalytic process, the effect of the catalyst on secondary processes, and others. Catalysts such as quartz, MgO, Al/sub 2/O/sub 3/, were used. Analysis of the experimental findings and the fact that the distribution of products is independent of the nature of the surface, demonstrate that the pyrolysis of hydrocarbons in the presence of catalysts is based on the heterogeneous-homogeneous radical-chain mechanism of action, and that the role of the catalysts reduces to increasing the concentration of free radicals. The concept of selectivity cannot be applied to catalysts here, since they do not affect the mechanism of the unfolding of the process of pyrolysis and their role consists solely in initiating the process. In catalytic pyrolysis the concepts of kinetic and diffusive domains of unfolding of the catalytic reaction do not apply, and only the outer surface of the catalyst is engaged, whereas the inner surface merely promotes deletorious secondary processes reducing the selectivity of the process  More>>
Publication Date:
Jan 01, 1979
Product Type:
Journal Article
Reference Number:
EDB-81-043797
Resource Relation:
Journal Name: Neftekhimiya; (USSR); Journal Volume: 4
Subject:
02 PETROLEUM; PETROLEUM FRACTIONS; CATALYTIC CRACKING; ALUMINIUM OXIDES; CATALYSTS; CATALYTIC EFFECTS; HYDROCARBONS; MAGNESIUM OXIDES; QUARTZ; ALKALINE EARTH METAL COMPOUNDS; ALUMINIUM COMPOUNDS; CHALCOGENIDES; CHEMICAL REACTIONS; CRACKING; DECOMPOSITION; ENERGY SOURCES; FOSSIL FUELS; FUELS; MAGNESIUM COMPOUNDS; ORGANIC COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; PETROLEUM; PYROLYSIS; SILICON COMPOUNDS; SILICON OXIDES; THERMOCHEMICAL PROCESSES; 020400* - Petroleum- Processing
OSTI ID:
6623040
Research Organizations:
Inst. of Catalysis, Novosibirsk, USSR
Country of Origin:
USSR
Language:
Russian
Other Identifying Numbers:
Journal ID: CODEN: NEFTA
Submitting Site:
HEDB
Size:
Pages: 583-586
Announcement Date:

Journal Article:

Citation Formats

Vail'eva, N A, and Buyanov, R A. Catalytic pyrolysis of hydrocarbons. USSR: N. p., 1979. Web.
Vail'eva, N A, & Buyanov, R A. Catalytic pyrolysis of hydrocarbons. USSR.
Vail'eva, N A, and Buyanov, R A. 1979. "Catalytic pyrolysis of hydrocarbons." USSR.
@misc{etde_6623040,
title = {Catalytic pyrolysis of hydrocarbons}
author = {Vail'eva, N A, and Buyanov, R A}
abstractNote = {Catalytic pyrolysis of petroleum fractions (undecane) was performed with the object of clarifying such questions as the mechanism of action of the catalyst, the concepts of activity and selectivity of the catalyst, the role of transport processes, the temperature ranges and limitations of the catalytic process, the effect of the catalyst on secondary processes, and others. Catalysts such as quartz, MgO, Al/sub 2/O/sub 3/, were used. Analysis of the experimental findings and the fact that the distribution of products is independent of the nature of the surface, demonstrate that the pyrolysis of hydrocarbons in the presence of catalysts is based on the heterogeneous-homogeneous radical-chain mechanism of action, and that the role of the catalysts reduces to increasing the concentration of free radicals. The concept of selectivity cannot be applied to catalysts here, since they do not affect the mechanism of the unfolding of the process of pyrolysis and their role consists solely in initiating the process. In catalytic pyrolysis the concepts of kinetic and diffusive domains of unfolding of the catalytic reaction do not apply, and only the outer surface of the catalyst is engaged, whereas the inner surface merely promotes deletorious secondary processes reducing the selectivity of the process and the activity of the catalyst. 6 references, 2 figures.}
journal = {Neftekhimiya; (USSR)}
volume = {4}
journal type = {AC}
place = {USSR}
year = {1979}
month = {Jan}
}