A series of iron ion-exchanged TiO₂- pillared clay catalysts (19Fe/Ti-PILC-x-y) were synthesized and evaluated for the performance of selective catalytic reduction of NO with propene (SCR-C₃H₆). The effect of the Ti/clay ratio and the calcination temperature on the catalytic performance was investigated. Results showed that the maximum NO conversion reached almost 100% at 400 °C, when the Ti/clay ratio was 10. The calcination temperature of the support had a very slight effect on the SCR performance. Several techniques of XRD, N₂ adsorption/desorption, Py-FTIR, etc. were used to characterize the catalysts. The Ti/clay ratio and calcination temperature led to an effect on the TiO₂ crystallites, further influencing the structure of TiO₂ pillared clay. Metal oxides (TiO₂, Fe₂O₃) were well-dispersed on these catalysts. An appropriate Ti/clay ratio obviously promoted the amount of Lewis acid, which is the dominant acidity on the catalyst surface and is the critical factor to influence the SCR activity. In situ DRIFTS studies revealed that monodentate nitrates, bidentate nitrates, formates, acetates, and isocyanates (R-NCO) were the main active species on the catalyst surface, where these nitrates promoted the oxidation of C₃H₆ to formats and acetates, and the R-NCO species were the important intermediates in the reaction of C₃H₆-SCR.

合成了一系列铁离子交换的TiO _2-柱状粘土催化剂（19Fe / Ti-PILC- x - y），并评估了丙烯（SCR-C ₃ H ₆）选择性催化还原NO的性能。研究了Ti /粘土比和煅烧温度对催化性能的影响。结果表明，当Ti /粘土比率为10时，最大的NO转化率在400°C时几乎达到100％。载体的煅烧温度对SCR性能影响很小。XRD，N ₂吸附/解吸，Py-FTIR等多种技术用于表征催化剂。Ti /粘土比和煅烧温度对TiO有影响_2个微晶，进一步影响TiO ₂柱状粘土的结构。金属氧化物（TiO ₂，Fe ₂ O ₃）很好地分散在这些催化剂上。适当的Ti /粘土比显然促进了路易斯酸的量，路易斯酸是催化剂表面的主要酸度，并且是影响SCR活性的关键因素。原位DRIFTS研究表明，单齿硝酸盐，双齿硝酸盐，甲酸盐，乙酸盐和异氰酸酯（R-NCO）是催化剂表面上的主要活性物质，这些硝酸盐促进C ₃ H ₆氧化成甲酸盐和乙酸盐，并且R-NCO是C ₃反应的重要中间体H ₆ -SCR。