Experimental Study of H2-NSR Performance of Pt/Ba/Ce/γ-Al2O3 Catalyst

Abstract

Abstract:

Abstract： The perovskite catalyst Pt/Ba/Ce/γAl2O3 was prepared by the improved SolGel method combined with incipient impregnation, and the surface properties were tested. Using the NOx storage reduction circulation test, the impact of the reaction conditions, including reductant concentration, reduction time and space velocity, and components of IC engine exhaust gas represented by CO2 and HC on the performance of NOx storage reduction (NSR) with H2 as reductant were studied. The experimental results indicate that the specific surface area and catalytic activity of Pt/Ba/Ce/γAl2O3 catalyst are favorable; within the scope of the study, with different reductant concentration there is an optimum reduction time when the NOx conversion rate is the highest, and the optimum reduction time decreases when the reductant concentration increases; the increase of reductant concentration accelerates the NOx desorption; if the reductant concentration is too high, some amount of NOx will spill, and the NOx conversion rate will drop; when the space velocity characteristic is perfect, the NOx conversion rate could still maintain 86.9% under high space velocity of 7.0×104 h-1; to some extent CO2 inhibit the NOx storage activity, but the catalyst can be regenerated; using C3H6 to simulate the exhaust HC, C3H6 has a negative effect on the NOx reduction process when the C3H6 concentration is low, however the C3H6 of high concentration could accelerate this process.

Key words: perovskite catalyst, NOx storage reduction (NSR), hydrogen, circulation test

CLC Number:

TK 46

YANG Wenjie,WEN Yalin,ZHANG Wugao. Experimental Study of H2-NSR Performance of Pt/Ba/Ce/γ-Al2O3 Catalyst[J]. Journal of Shanghai Jiaotong University, 2015, 49(05): 583-589.

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