The present invention relates to a process for preparing a catalyst material, comprising the steps of: (a) providing a support material having surface hydroxyl (OH) groups, wherein the support material is ceria (CeO2), zirconia (ZrO2) or a combination of thereof; (b) reacting the support material having surface hydroxyl (OH) groups of step (a) with a precursor containing two transition metal atoms, each chosen independently from the group consisting of: W, Mo, Cr, Ta, Nb, V, Mn; (c) calcining the product obtained in step (b) in order to provide a catalyst material showing dual site surface species containing pairs of transition metal atoms derived from the precursor that are present in oxide form on the support material. The present invention further relates to a catalyst material as may be obtained by the process set out above, and the use of the catalyst material as an ammonia selective catalytic reduction (NH3-SCR) catalyst for nitrogen oxides (NOx) reduction.
本发明涉及一种制备催化剂材料的方法,包括以下步骤:(a)提供具有表面羟基(OH)基团的载体材料,其中所述载体材料为
氧化铈(
CeO2)、
氧化锆(ZrO2)或两者的组合物;(b)将步骤(a)中具有表面羟基(OH)基团的载体材料与含有两个过渡
金属原子的前体反应,每个过渡
金属原子独立选择自W、Mo、Cr、Ta、Nb、V、Mn组成的群体中的一种;(c)焙烧步骤(b)中获得的产物,以提供一种催化剂材料,该催化剂材料显示双位点表面物种,其中包含从前体衍生的成对的过渡
金属原子,以氧化物形式存在于载体材料上。本发明还涉及通过上述方法获得的催化剂材料以及将该催化剂材料用作
氨选择性催化还原(NH3-SCR)催化剂以减少氮氧化物(NOx)的用途。