Preparation of 3DOM ZrTiO4 Support, WxCeMnOδ/3DOM ZrTiO4 Catalysts, and Their Catalytic Performance for the Simultaneous Removal of Soot and NOx

Ruidan Wang; Chengming Zhong; Dong Li; Xuehua Yu; Zhen Zhao; Zbigniew Sojka; Andrzej Kotarba; Yuechang Wei; Jian Liu

doi:10.3389/fchem.2022.880884

Preparation of 3DOM ZrTiO₄ Support, W_xCeMnO_δ/3DOM ZrTiO₄ Catalysts, and Their Catalytic Performance for the Simultaneous Removal of Soot and NO_x

Front Chem. 2022 May 4:10:880884. doi: 10.3389/fchem.2022.880884. eCollection 2022.

Authors

Ruidan Wang^{1

2}, Chengming Zhong¹, Dong Li¹, Xuehua Yu², Zhen Zhao^{1

2}, Zbigniew Sojka³, Andrzej Kotarba³, Yuechang Wei¹, Jian Liu¹

Affiliations

¹ State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing, China.
² Institute of Catalysis for Energy and Environment, College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang, China.
³ Faculty of Chemistry, Jagiellonian University, Kraków, Poland.

Abstract

As an efficient and durable engine, a diesel engine has a broad application. However, soot particles (PM) and nitrogen oxides (NO_x) coming from diesel engines are the main causes of air pollution, so it is necessary to design and prepare an effective catalyst for the simultaneous elimination of PM and NO_x. In this work, a novel 3DOM ZrTiO₄ support and a series of W_xCeMnO_δ/3DOM ZrTiO₄ catalysts (where x indicates the wt% of W) were designed and fabricated by the colloidal crystal template technique. Among the as-prepared catalysts, the W₁CeMnO_δ/3DOM ZrTiO₄ catalyst exhibits the highest NO conversion rate (52%) at the temperature of maximum CO₂ concentration (474°C) and achieves 90% NO conversion in the temperature range of 250-396°C. The excellent catalytic performance is associated with the macroporous structure, abundant oxygen vacancies, sufficient acid sites, and the synergistic effect among the active components. The possible reaction mechanisms of W_xCeMnO_δ/3DOM ZrTiO₄ catalysts were also discussed based on the characterization results.

Keywords: catalysts; nitrogen oxides; simultaneous removal; soot particulates; three-dimensional ordered macroporous structure.