富氧条件下Rh/Co_3O_4催化剂对C_3H_6还原NO性能的影响

采用液相沉淀法制备Co3O4氧化物,并以其为载体制备负载型Rh催化剂。考察不同焙烧温度制备的载体和催化剂的结构、织构、氧化还原性能及其对C3H6催化还原NO性能的影响。结果发现,经600℃焙烧的载体制备的Rh/Co3O4催化剂中Rh与Co3O4的相互作用较强,促进对N—O键的削弱作用,提高对C3H6还原NO的还原能力。在相同实验条件下,当体系中C3H6为500×10-6、NO为500×10-6和O2体积分数为5%时,NO转化率50%,催化性能优于Rh/Al2O3催化剂。

Performance of Rh/Co3O4 catalyst for catalytic reduction of NO with C3H6 under excess oxygen

Co₃O₄ oxide was prepared by the liquid precipitation method,and then using it as the support,Rh/Co₃O₄ catalyst were prepared.The structure,the texture,the redox and the performance of the supports calcined at the different temperatures and the catalysts for catalytic reduction of NO withC₃H₆ were investigated.The results showed that the performance of Rh/Co₃O₄ catalyst prepared byCo₃O₄ 600 for the catalytic reduction of NO withC₃H₆ was improved,which ascribed to the stronger interreaction between Rh andCo₃O₄ ,resulting in weakening N-O bond.Under the same condition ofC₃H₆ 500×10^-6,NO 500×10^-6 and O₂ 5vol%,NO conversion was 50%.The performance of Rh/Co₃O₄ catalyst for catalytic reduction of NO withC₃H₆ was better than that of Rh/Al₂O₃ catalyst.