Application of Pt-Al2O3 catalyst in selective catalytic reduction of nitrogen oxide by propene

作者：Li JH^*; Hao JM; Fu LX; Zhu TL; Chen LL; Cui XY; Liu ZM

来源：Chemical Journal of Chinese Universities, 2004, 25(1): 131-135.

• pt-Al2O3 catalyst
• impregnation
• sol -gel
• NOx
• NO selective reduction

Pt-Al2O3 is an excellent catalyst for selective catalytic reduction nitrogen oxide at a lower temperature in the presence of oxygen. A series of Pt-Al2O3 catalysts with various platinium loadinds were prepared by the sol-gel(SG) and impregnation (IM) methods and the selective catalytic reduction activity of NOx with propene(C3H6) as the reductant in the presence of excess oxygen was investigated in a fixed-bed microreactor. The results show that Pt-Al2O3 has a high activity. Based on the preparation method used in this paper, the optimal Pt loading in mass fraction is 0. 35% for IM and 2% for SG respectively; the relationships between the activities over these catalysts and the reaction temperature and the concentrations of reactants and the operation condition were studied respectively. The increase of the C3H6 concentration and O-2 concentration in a certain range both promoted the reduction of NO, the optimal oxygen mass fraction is about 8 %. The presence of 0. 009% SO2 decreases the catalytic activity, but the ability of resistance SO2 of 2% Pt-Al2O3 (SG) is better than 0. 35% Pt-Al2O3 (IM), 10% water present in the feed can enhance the catalytic activity above, 250 degreesC and promoted the selective catalytic reduction of NOx over a wide window (200-450 degreesC).

• 出版日期2004-1
• 单位清华大学