In order to improve endothermic ability of endothermic hydrocarbon fuel, the endothermic hydrocarbon fuel NNJ-150 and the catalysts mixed with USY and ZSM-5 which have been modified by La~(3+) and Ag~+ were prepared. NNJ-150 cracked on USHY, HZSM-5, their mixture and mixed zeolite catalysts modified by Ag~+ and La~(3+) was studied. Results show that the selectivity of light olefins is high (600 ℃, 47.92%), the lifetime of catalyst is long (above 35 min, 500 ℃), and the performance of catalyst is stable when NNJ-150 is cracked on Ag-LaUSY + Ag-LaZSM-5 (75:25). It can satisfy the need of cooling high supersonic craft.

Key words: HZSM-5, CATAROLE PROCESS, ION EXCHANGING, CATALYTIC ACTIVITY, Ag, La