Assessment of diffusional inhibition via primary and secondary cracking analysis
Journal Article
·
· J. Catal.; (United States)
Although the importance of diffusional effects in heterogeneous catalysis has long been recognized, in routine practice this factor is often overlooked. Methods of evaluating intraparticle diffusional inhibition usually involve the testing of two or more particle sizes of the same material. This procedure can reveal diffusional inhibition only if it exists in the macropores, but not if in the micropores, the lengths of which are unchanged by such manipulation. An alternative is to take a kinetic approach. The objective of this paper is to show how cracking, which is a ubiquitous reaction in hydrocarbon catalysis, can be analyzed to obtain diffusion information. The paper first describes the mechanics of PASCA (primary and secondary cracking analysis), showing how sequential reaction analysis is possible despite the lack of a formal B and C molecule. Based on this, an index of diffusional inhibition is derived. Finally, experimental data illustrating the application of PASCA is presented.
- Research Organization:
- Exxon Research and Engineering Co., Annandale, NJ (USA)
- OSTI ID:
- 5217453
- Journal Information:
- J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 106:1; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
Similar Records
Primary and secondary cracking analysis: A new and simple method for estimating diffusional inhibition
Stereological analysis of the macropore structure of chars produced under various pyrolysis conditions and the influence of macropore structure on char gasification rates in the presence of strong diffusional limitations
Mass-transfer mechanisms for zeolite ion exchange in wastewater treatment
Conference
·
Tue Mar 31 23:00:00 EST 1987
· American Chemical Society, Division of Petroleum Chemistry, Preprints; (USA)
·
OSTI ID:5086599
Stereological analysis of the macropore structure of chars produced under various pyrolysis conditions and the influence of macropore structure on char gasification rates in the presence of strong diffusional limitations
Thesis/Dissertation
·
Wed Dec 31 23:00:00 EST 1986
·
OSTI ID:6988180
Mass-transfer mechanisms for zeolite ion exchange in wastewater treatment
Journal Article
·
Wed Nov 30 23:00:00 EST 1994
· AIChE Journal (American Institute of Chemical Engineers); (United States)
·
OSTI ID:6603327
Related Subjects
02 PETROLEUM
020400 -- Petroleum-- Processing
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
CATALYSTS
CATALYTIC CRACKING
CHEMICAL REACTIONS
CONSTRAINTS
CRACKING
CRYSTAL STRUCTURE
DECOMPOSITION
DIFFUSION
ENERGY SOURCES
FOSSIL FUELS
FUELS
HYDROCARBONS
MEASURING METHODS
MICROSTRUCTURE
ORGANIC COMPOUNDS
PARTICLE SIZE
PERFORMANCE TESTING
PETROLEUM
POROSITY
PROCESSING
PYROLYSIS
REFINING
SIZE
SURFACE PROPERTIES
TESTING
THERMOCHEMICAL PROCESSES
020400 -- Petroleum-- Processing
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
CATALYSTS
CATALYTIC CRACKING
CHEMICAL REACTIONS
CONSTRAINTS
CRACKING
CRYSTAL STRUCTURE
DECOMPOSITION
DIFFUSION
ENERGY SOURCES
FOSSIL FUELS
FUELS
HYDROCARBONS
MEASURING METHODS
MICROSTRUCTURE
ORGANIC COMPOUNDS
PARTICLE SIZE
PERFORMANCE TESTING
PETROLEUM
POROSITY
PROCESSING
PYROLYSIS
REFINING
SIZE
SURFACE PROPERTIES
TESTING
THERMOCHEMICAL PROCESSES