Composite metal oxide catalyst applied to direct decomposition of NO and preparation method of composite metal oxide catalyst

The invention discloses a composite metal oxide catalyst applied to direct decomposition of NO and a preparation method of the composite metal oxide catalyst, the catalyst is a compound of perovskite type oxide and metal oxide, corresponding metal ion nitrate and ethylenediamine tetraacetic acid and citric acid double complexing agents are complexed, and then water bath heating, presintering and calcination are performed to prepare the catalyst. The composite metal oxide catalyst provided by the invention has high NO direct decomposition catalytic activity (the highest NO conversion rate can reach 89%) in a temperature range of 500-850 DEG C, strong oxidation resistance and excellent long-term stability, and can obtain high catalytic activity at a high space velocity; the preparation method is a one-pot method, is simple and feasible, is economical and environment-friendly, and is suitable for large-scale industrial production. 本发明公开一种应用于NO直接分解的复合金属氧化物催化剂及其制备方法，催化剂是钙钛矿型氧化物和金属氧化物的复合物，采用相应的金属离子硝酸盐以及乙二胺四乙酸和柠檬酸双络