【摘要】 考察了贫燃条件下Pt/SAPO-34催化剂低温(60～260℃)选择催化还原(H2-SCR)消除NO的催化性能,研究了载体、金属负载量和反应条件对催化性能的影响.结果表明,0.5%Pt/SAPO-34催化剂的活性高于相同金属负载量的Pt/SiO2和Pt/ZSM-5,其在高空速(80000h-1)时的最高NO转化率可达78.8%,N2选择性为75.2%,而在空速降低到10000h-1时,其NO转化率可达到100%.通过原外漫反射红外光谱初步研究了H2-SCR反应的机理,发现反应的中间物种主要是-NO3-.更多还原

【Abstract】 Selective catalytic reduction of NO by H2 (H2-SCR) under lean burn conditions at low temperature (60-260 ℃) was studied over the SAPO-34-supported platinum catalyst. The effects of supports,Pt loading,and reaction conditions on the catalyst activity were investigated. The NO conversion of 78.8% and N2 selectivity of 75.2% were achieved on the 0.5%Pt/SAPO-34 catalyst at GHSV of 80 000 h-1 and 120 ℃,superior to that on the Pt/SiO2 and Pt/ZSM-5 catalysts. The decrease in GHSV further enhanced the NO conversion to as high as 100% at GHSV of 10 000 h-1. The reaction mechanism of NO in H2-SCR over 0.5%Pt/SAPO-34 was investigated using in situ DRIFTS. The results showed that nitrate species were the main reaction intermediates of NO reduction.更多还原