Pd(OH)₂/CeO₂在六苄基六氮杂异伍兹烷和四乙酰基二苄基六氮杂异伍兹烷催化氢解脱苄反应中的应用

Palladium hydroxide catalysts play a key role in the preparation of hexanitrohexaazais-owurtzitane (CL-20). Eight kinds of Pd(OH)₂/CeO₂ catalysts, for which two kinds of CeO₂ are used as catalyst support, were prepared by deposition-precipitation method. The effects of the preparation temperature, immersion time, the kinds of alkali, pH and the structure of support on the catalytic performance of Pd(OH)₂/CeO₂ are investigated. Pd(OH)₂/CeO₂ catalysts exhibit excellent catalytic activity in the hydrogenolytic debenzylation reaction of both hexabenzylhexaazaisowurtzitane (HBIW) and tetraacetyl-dibenzyl-hexaazaisowurtzitane(TADBIW), and the yields of products can reach 91% and 95%, respectively. When the amount of Pd used in catalyst is 0.10% (wt/wt) of HBIW substrate, the yield of TADBIW reachs 91%. When the amount of Pd is 0.28%(wt/wt)of TADBIW substrate, the yield of the product is as high as 87%. In this research, a small amount of Pd catalyst is used to efficiently catalyze the hydrogenolytic debenzylation reaction of HBIW and TADBIW, which broadens the way for low-cost preparation of CL-20.