Catalytic Materials for Gasoline Particulate Filters Soot Oxidation

Abstract

The energy efficiency of Gasoline Direct Injection (GDI) engines is leading to a continuous increase in GDI engine vehicle population. Consequently, their particulate matter (soot) emissions are also becoming a matter of concern. As required for diesel engines, to meet the limits set by regulations, catalyzed particulate filters are considered as an effective solution through which soot could be trapped and burnt out. However, in contrast to diesel application, the regeneration of gasoline particulate filters (GPF) is critical, as it occurs with almost an absence of NOx and under oxygen deficiency. Therefore, in the recent years it was of scientific interest to develop efficient soot oxidation catalysts that fit such particular gasoline operating conditions. Among them ceria- and perovskite-based formulations are emerging as the most promising materials. This overview summarizes the very recent academic contributions focusing on soot oxidation materials for GDI, in order to point out the most promising directions in this research area.

Catalytic Diesel and Gasoline Particulate Filters

“…This Special Issue includes three reviews [1][2][3] and three articles [4][5][6]. The review by Lisi et al [1] addresses the most important issue to an effective regeneration of catalytic (i.e., catalyst-coated) diesel particulate filters (DPFs): the contact between soot and catalyst.…”

“…They found that, thanks to its capability of releasing active oxygen species, this catalyst exhibited a remarkable activity and CO 2 selectivity at low oxygen concentrations. Matarrese [3] reviewed the most relevant and significant publications regarding soot oxida-…”