Washcoat Technology and Precious Metal Loading Study Targeting the California LEV MDV2 Standard

Paper #:
  • 961904

Published:
  • 1996-10-01
Citation:
Smaling, R., Sung, S., and Bartlett, R., "Washcoat Technology and Precious Metal Loading Study Targeting the California LEV MDV2 Standard," SAE Technical Paper 961904, 1996, https://doi.org/10.4271/961904.
Pages:
10
Abstract:
Meeting the California Medium-Duty truck emissions standards presents a significant challenge to automotive engineers due to the combination of sustained high temperature exhaust conditions, high flow rates and relatively high engine out emissions. A successful catalyst for an exhaust treatment system must be resistant to high temperature deactivation, maintain cold start performance and display high three-way conversion efficiencies under most operating conditions. This paper describes a catalyst technology and precious metal loading study targeting a California Medium-Duty truck LEV (MDV2) application. At the same time a direction is presented for optimizing toward the Federal Tier 1 standard through reduction of precious metal use. The paper identifies catalytic formulations for a twin substrate, 1.23 L medium-coupled converter. Two are used per vehicle, mounted 45 cm downstream of each manifold on a 5.7 L V8 engine.
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