Papers by Keyword: Pillared Clays

Abstract: Different Cu-loading pillared clays catalysts were studied in selective catalytic reduction of NO by propylene. The catalyst prepared by incipient wetness impregnation (Cu/Ti-PILCs) had better catalytic activity and stability than that prepared by ion-exchanged method (Cu-Ti-PILCs). Cu/Ti-PILCs has higher BET surface area than Cu-Ti-PILCs. Pore size distribution analysis and XRD showed that Cu species dispersed well in Cu/Ti-PILCs but formed conglomeration in Cu-Ti-PILCs. TPR showed that Cu²⁺ species were the main active species on the Cu/Ti-PILCs, which was responsible for the high catalytic activity of catalyst.

Abstract: Catalyst Cu/Ti-PILCs were used for selective catalytic reduction of NO by propylene. The effect of calcinations temperature of Cu/PILCs on catalytic activity, pore structure and active species were investigated. Cu/Ti-PILCs calcined at 500°C had best activity. On 500°C-calcined catalyst, the Cu species was highly-dispersed and existed mainly as Cu2＋species which was the catalytic active component to SCR reaction. The pore structure of Cu/Ti-PILCs had good thermal stability below 600°C calcinations. 700°C-calcined catalyst has poor catalytic activity. High-temperature calcinations destroyed the catalyst’s pore structure, and formed CuO bulky aggregation which had no catalytic activity, all these led to the decrease of the SBET of catalysts and the drop of catalytic activity.