Hydrogenation of aromatics on Pt/Pd bimetallic catalyst supported by al-containing mesoporous silica

摘要

Aluminum substituted mesoporous molecular sieves (Al-MMS) were prepared using H_2SiF_6 as a silicon source with the mole ration of SiO_2:Al_2O_3:HF:NH_4OH:CTMABR:H_2O=1 : 0.0066-0.02: 6.75: 7.19: 0.32: 220. Aluminum substituted silica-based mesoporous molecular sieve with good crystallinity and narrow pore size distribution could be prepared at atmospheric pressure in several hours. In order to prepare the catalysts for aromatic hydrogenation, platinum and palladium precursors were impregnated on Al-MMS. The activity of Pt-Pd/Al-MMS was compared with that of Pt-Pd/DAY (dealuminated zeolite Y). Pt-Pd/Al-MMS catalyst has more activity than Pt-Pd/DAY, and has much less cracking activity due to mild acidity, indicating high yield of liquid. These above results well illustrate the application of Pt-Pd/Al-MMS as catalyst for selective aromatic hydrogenation.