DOC Study on the Effects of Catalyst Active Component Loading and Carrier Properties on the Catalytic Conversion Efficiency of Key Gaseous Pollutants

Yantao Zou and Liguang Xiao ()
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Yantao Zou: School of Materials Science and Engineering, Jilin Architecture University, Changchun 130052, China
Liguang Xiao: School of Materials Science and Engineering, Jilin Architecture University, Changchun 130052, China

Sustainability, 2025, vol. 17, issue 14, 1-14

Abstract: Based on engine bench testing, this study investigated the effect of diesel oxidation catalytic converter (DOC) formulations on the gaseous emissions performance of diesel engines equipped with a DOC+ catalyzed diesel particulate filter (CDPF)+selective catalytic reduction (SCR) system after the treatment system. The experimental results indicate that changes in DOC formulations have no significant effect on engine fuel economy. As the precious metal loading increases and the Pt/Pd ratio decreases, the T 50 for CO and HC decreases, and the low-temperature conversion rates (<300 °C) for CO and HC increase. However, as the temperature continues to rise, the beneficial effect of increased precious metal loading or Pd on CO and HC conversion rates gradually weakens. The average conversion rates in the high-temperature range (≥300 °C) show little difference. The NO conversion rate increases with increasing precious metal loading. The NO conversion rate is more sensitive to Pt content, with higher Pt content formulations promoting NO oxidation, contrary to the trends observed for CO and HC conversion rates. When the SCR inlet temperature is low, high NO 2 concentrations are beneficial for improving the SCR’s NOx conversion efficiency. When the SCR inlet temperature is high, the SCR’s NOx conversion efficiency exceeds 90% with no significant differences. No significant impact of DOC formulation changes on CDPF pressure drop under external conditions was observed.

Keywords: catalyst; diesel engine; emission control; DOC+CDPF+SCR; gaseous emissions (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2025
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