title: Effectiveness of non-noble metal based diesel oxidation catalysts on particle number emissions from diesel and biodiesel exhaust.
abstract: Two new formulations of non-noble metal based diesel oxidation catalysts based on CoCe based mixed oxide (DOC2) and perovskite catalysts (DOC3) were prepared and retrofitted in a 4-cylinder diesel engine fueled by diesel and Karanja biodiesel blend (KB20). In this study, their effectiveness in reducing raw exhaust particulate emissions vis-à-vis a commercial diesel oxidation catalyst (DOC1) was evaluated. Emission characteristics such as particle number-size distribution, mass-size distribution, and surface area-size distribution, total particle number concentration and count mean diameter as a function of engine load at constant engine speed were evaluated. Variations in total particle number concentration as a function of engine speed were also determined. The prepared DOCs and the commercial DOC showed varying degrees of performance as a function of engine operating conditions. Overall, effectiveness of the prepared DOC's appeared to be more fuel specific. For diesel exhaust, overall performance of DOC1was more effective compared to both prepared DOCs, with DOC2being superior to DOC3. In case of KB20 exhaust, the overall performance of DOC2was either more effective or nearly comparable to DOC1,while DOC3being not so effective. This showed that the DOCs based on CoCe based mixed oxide catalysts have potential to replace commercial noble metal based DOC's, especially in engines fueled by biodiesel.
authors: Department of Civil Engineering, Indian Institute of Technology Kanpur, Kanpur-208016, India.
authors: Pravesh Chandra
authors: PC
authors: Shukla
authors: Department of Civil Engineering, Indian Institute of Technology Kanpur, Kanpur-208016, India.
authors: Tarun
authors: T
authors: Gupta
authors: National Environmental Engineering Research Institute, Council of Scientific & Industrial Research, Nagpur-440020, India.
authors: Nitin Kumar
authors: NK
authors: Labhasetwar
authors: National Environmental Engineering Research Institute, Council of Scientific & Industrial Research, Nagpur-440020, India.
authors: Rohini
authors: R
authors: Khobaragade
authors: Department of Civil Engineering, Indian Institute of Technology Kanpur, Kanpur-208016, India.
authors: Neeraj K
authors: NK
authors: Gupta
authors: Department of Mechanical Engineering, Indian Institute of Technology Kanpur, Kanpur-208016, India. Electronic address: akag@iitk.ac.in.
authors: Avinash Kumar
authors: AK
authors: Agarwal
keywords: Diesel; Diesel oxidation catalysts (DOCs); Karanja biodiesel; Non-noble metal based catalysts; Particulate emission