Preparation of 3DOM ZrTiO Support, WCeMnO/3DOM ZrTiO Catalysts, and Their Catalytic Performance for the Simultaneous Removal of Soot and NO.

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.