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Catalyst Performance in Outdoor Equipment: Overcoming Thermal Challenges

Discover how large 3-way catalysts, with adequate secondary air, reduce emissions in outdoor equipment. Learn about the considerations for catalyst size, heat generation, noise reduction, and evap control integration. Find out about thermal issues and the impact of increased temperatures on equipment components. Contact the Outdoor Power Equipment Institute for more information.

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Catalyst Performance in Outdoor Equipment: Overcoming Thermal Challenges

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  1. SwRI Exhaust Tests - 1 • Data proves the obvious - that large 3-way catalysts, supplied with enough secondary air (engine enleanment or SAI) can reduce emissions. • From an equipment perspective, issues that need to be considered include: • catalyst size and packaging in a “dirty” environment • heat generation (burns, grass fires, melted plastic, vapor explosions) • noise reduction, given muffler’s new role as cat-container • incorporation of catalyst with evap controls The Outdoor Power Equipment Institute 341 South Patrick Street • Alexandria, VA 22314 • 703-549-7600 • 703-549-7604 FAX • www.opei.org

  2. SwRI Exhaust Tests - 2 • Thermal Issues • Temperature measurement is affected by thermocouple location, contact, convective effects, etc. Detailed studies need to be done to confirm/verify expected peak temperatures, locations, sensitivity to operating and locational parameters such as orientation for numerous products by each OEM • Detailed thermal balance needs to be conducted The Outdoor Power Equipment Institute 341 South Patrick Street • Alexandria, VA 22314 • 703-549-7600 • 703-549-7604 FAX • www.opei.org

  3. Adverse Impact of Increased Temperatures on Equipment Components/Applications (OPEI’s September 10, 2002 Comments) The Outdoor Power Equipment Institute 341 South Patrick Street • Alexandria, VA 22314 • 703-549-7600 • 703-549-7604 FAX • www.opei.org

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