Wang Ruidan, Zhong Chengming, Li Dong, Yu Xuehua, Zhao Zhen, Sojka Zbigniew, Kotarba Andrzej, Wei Yuechang, Liu Jian
State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing, China.
Institute of Catalysis for Energy and Environment, College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang, China.
Front Chem. 2022 May 4;10:880884. doi: 10.3389/fchem.2022.880884. eCollection 2022.
As an efficient and durable engine, a diesel engine has a broad application. However, soot particles (PM) and nitrogen oxides (NO) 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. In this work, a novel 3DOM ZrTiO support and a series of WCeMnO/3DOM ZrTiO catalysts (where x indicates the wt% of W) were designed and fabricated by the colloidal crystal template technique. Among the as-prepared catalysts, the WCeMnO/3DOM ZrTiO catalyst exhibits the highest NO conversion rate (52%) at the temperature of maximum CO 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 WCeMnO/3DOM ZrTiO catalysts were also discussed based on the characterization results.
作为一种高效且耐用的发动机，柴油发动机有着广泛的应用。然而，柴油发动机排放的碳烟颗粒（PM）和氮氧化物（NO）是空气污染的主要成因，因此有必要设计并制备一种能同时消除PM和NO的高效催化剂。在本工作中，通过胶体晶体模板技术设计并制备了一种新型的三维有序大孔（3DOM）ZrTiO载体以及一系列WCeMnO/3DOM ZrTiO催化剂（其中x表示W的质量分数）。在所制备的催化剂中，WCeMnO/3DOM ZrTiO催化剂在最大CO浓度温度（474°C）下表现出最高的NO转化率（52%），并在250 - 396°C的温度范围内实现了90%的NO转化率。优异的催化性能与大孔结构、丰富的氧空位、充足的酸性位点以及活性组分之间的协同效应有关。基于表征结果，还讨论了WCeMnO/3DOM ZrTiO催化剂可能的反应机理。
