Soot oxidation catalyst materials and selective catalytic reduction filter devices incorporating the same

An exhaust gas treatment system, the system comprising:

• an exhaust gas source;
• an exhaust gas conduit capable of receiving an exhaust gas stream from the exhaust gas source;
• and
• a selective catalytic reduction filter (SCRF) device in fluid communication with the exhaust gas conduit and disposed downstream relative to the oxidation catalyst device, wherein the SCRF device includes:
• a shell,
• a filter disposed within the shell having an upstream side and a downstream side,
• a selective catalytic reduction (SCR) catalyst disposed within the shell on at least a portion of the filter and configured to receive reductant, and
• a soot oxidizing catalyst (SOC) material disposed on at least a portion of one or more of the filter and the SCR catalyst, wherein the SOC material comprises one or more of titanium oxide, acidic zirconia, or a perovskite and the SOC material confers a suitable net in-situ NO2 generating benefit relative to its reductant oxidizing effect.

A selective catalytic reduction filter (SCRF) device, the device comprising:

• a shell;
• a filter disposed within the shell having an upstream side and a downstream side;
• a selective catalytic reduction (SCR) catalyst disposed within the shell on at least portion of the filter and configured to receive reductant;
• and
• a soot oxidizing catalyst (SOC) material disposed on at least a portion of one or more of the filter and the SCR catalyst, wherein the SOC material comprises one or more perovskites, and wherein the one or more perovskites are capable of generating in-situ NO2 and the SOC material confers a suitable net in-situ NO2 generating benefit relative to its reductant oxidizing effect.