Pd-doped rare earth perovskite catalysts for progress

Lean-burn technology can greatly reduce vehicle fuel consumption, while reducing greenhouse gas emissions of carbon dioxide, but the lean (oxygen) atmosphere, the nitrogen oxide (NOx) it is hard to remove catalyst. Recently, Li Xingang Tianjin University research group using NOx trap (LNT) technology will be relatively inexpensive Pd on rare earth doped perovskite among the perovskite catalysts obtained La0.7Sr0.3Co0.97Pd0.03O3 at 275 ° C ~ 400 ° C operating temperature window, NOx elimination of N2 efficiency and product selectivity were higher than 90%. Meanwhile, the catalyst also shows excellent resistance to sulfur in the reaction gas line 100ppm SO2 added almost no effect on the catalytic activity. The catalyst can be used to replace the expensive Pt-based catalysts LNT lean NOx catalyst in the exhaust elimination Catalytic Removal of NOx with excellent results.

Task Force to use the Shanghai Light BL14W1 XAFS Line Station characterize rare earth perovskite catalysts before and after reaction of Pd valence of elements and with bit and found that Pd in lean (oxygen-rich) atmosphere to exist in the form ionic perovskite mine the crystal lattice; while in fuel-rich (oxygen-depleted) atmosphere, places metallic precipitates perovskite lattice, the catalytic elimination of nitrogen oxides involved. This indicates that ionic and metallic Pd to the continuous "lean / rich combustion" Pulse atmosphere of "smart" self-transformation, regeneration, some research results have been published in Journal of American Chemical Society, ACS Catalysis (ACS Catal. 2013, 3 , 1071-1075).
    
The paper by the American news media Chemical & Engineering News highlights work carried out for the selection of reports and noted that compared with Pt-based LNT catalyst, Pd-doped rare earth perovskite catalysts are relatively inexpensive, high sulfur capacity, has great prospects for commercial applications . Currently, the research group working on rare-earth doped perovskite catalyst Pd resistance to sulfur mechanism for further in-depth study.


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