This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
New High-Performance Gas Flow Equalizing Metal Supports for Automotive Exhaust Gas Catalysts
Annotation ability available
Sector:
Language:
English
Abstract
Under any driving conditions, the gas flow in present-day monoliths for automotive exhaust catalysts shows laminar characteristics resulting in thick boundary layers. These tend to restrict mass transfer, a highly desirable prerequisite to good catalytic activity.
Based on the theory of catalysis and in the light of such all-important mass transfer, the design of the existing type of catalyst metal supports has been revised.
The new metal supports vary from their predecessors by largely split and slotted honeycomb passages. In this way, gas flow is split and divided over and over again. This results in thin boundary layers and turbulence on the catalytically active support surfaces, with intense mass transfer between the core stream and the surface-contacting zone.
The resultant improvements are discussed in terms of catalytic effect, size, weight, cost, internal flow, temperature equalization and component strength.
Authors
Topic
Citation
Nonnenmann, M., "New High-Performance Gas Flow Equalizing Metal Supports for Automotive Exhaust Gas Catalysts," SAE Technical Paper 900270, 1990, https://doi.org/10.4271/900270.Also In
References
- Lewis, W.K. Mech. Eng. 44 1922 445
- Eckert, E.R.G. Springerverlag Berlin
- Nonnenmann, M. New Metal Supports for Exhaust Gas Catalytic Converters for Improved Activity and Internal Flow Equalization 1989
- Ă–ser, P. Novel Autocatalyst Concepts and Strategies for the Future with Emphasis on Metal Supports SAE 880319
- Abthoff, J. Schuster H.-D. Noller Ch. Concept of Catalytic Exhaust Emission Control For Europe SAE 852095
- Klein, B. Blech, Rohre 1985 45
- Nonnenmann, M. Metal Supports for Exhaust Gas Catalysts SAE 850131