Y分子筛负载型双贵金属脱芳烃催化剂抗硫性能的研究

 制备了Y分子筛负载的Pt-Pd和Pt-Ir两种双贵金属催化剂，采用程序升温还原法和吡啶吸附傅立叶红外光谱法表征了催化剂活性相的结构。采用固定床微型反应器，以加入一定量噻吩的甲苯为模型反应物，在压力4.0MPa、空速2h-1、温度300℃、氢/油体积比1000的条件下，进行模型化合物的加氢脱芳烃反应，比较了这两种催化剂的抗硫性能。结果表明，尽管Pt-Ir催化剂具有良好的开环选择性，但是相对于Pt-Pd催化剂，其抗硫性能较差。Pt-Pd催化剂较高的抗硫性能归因于Pt-Pd双金属的合金化效应。

STUDY ON SULFUR RESISTIBILITY OF BIMETALLIC CATALYSTS SUPPORTED ON Y ZEOLITE

Bimetallic catalysts (Pt-Pd, Pt-Ir) supported on Y zeolite were prepared and the structures of their active components were characterized by using TPR and pyridine-adsorbed infrared spectroscopy. The resistance of these catalysts to sulfur poisoning was investigated by the hydrogenation reaction of thiophene-toluene model reactant (containing 100 μg/g sulfur) in a fixed-bed micro-reactor under the conditions of 4.0MPa, LHSV 2h-1, 300℃. The results showed that the ring-opening selectivity of toluene hydrogenation on the Pt-Ir catalyst was better than that on Pt-Pd catalyst, but the sulfur-resistance of Pt-Ir catalyst was lower. The higher sulfur-resistance of Pt-Pd catalyst attributed to the alloy effect of Pt and Pd metal.