Analysis of Sophisticated DPNR Catalyst, Focused on PM Particle Number Emissions

Kuwajima, Masamichi; Okawara, Seiji; Tsuzuki, Masato; Yamaguchi, Masatoshi; Matsuno, Shigehiro

doi:10.4271/2009-01-0290

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Exhaust Emission Control Considerations for Diesel Engines

Johnson

2014

Encyclopedia of Automotive Engineering

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This chapter summarizes major recent developments in diesel emissions technologies and system design. Emissions challenges that are covered include particulate matter ( PM ) remediation using diesel particulate filters ( DPFs ), lean NO x remediation, and hydrocarbon (HC) and carbon monoxide controls. NO x control technologies are summarized, including SCR (selective catalytic reduction) with ammonia and HC‐based approaches. PM reduction technologies are evolving around new DPF materials for reduced back pressure and SCR integration, and optimization of regeneration and control. Technologies for NO x control are achieving >95% deNO x efficiency averaged over the certification test cycles. DOC (diesel oxidation catalyst) developments are used to precondition the exhaust for both deNO x and PM remediation systems and for removing unburned fuel components. They mainly involve NO oxidation to NO 2 as a function of catalyst formulation and HC oxidation parameters. Nitrous oxide ( N 2 O ) emissions are also addressed. System layout and fundamental control strategies are outlined for integrated systems involving all three unit operations.

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