溶胶凝胶法制备的Pd-钙钛矿催化剂的氧化还原性能

Three-way catalysts with low precious metal loading but effective eliminating function are highly expected. The precious metals could be remarkably reduced by using perovskites, LaFe0.57Co0.38Pd0.05O3 and CaTi0.98Pt0.02O3, in which precious metal could incorporate into the B-site of the perovskite lattice with a self-regenerative function. However, the organic precursors have to employ for synthesis such kind of materials. Here we prepare LaFe1-xPdxO3 perovskites with a sol-gel method by using routine metal salts. The states of the Pd species and the interaction between Pd and LaFeO3 were extensively investigated. The Pd-perovskites exhibited well crystallinity structure and enhanced redox properties. The Pd species could incorporate into the LaFeO3 lattice with appropriate amount, including Pd4+ and Pd2+, and can move out of the LaFeO3 lattice under reductive atmosphere