Tetralin hydroconversion process is a complex reaction consisting of the hydrogenation, dehydrogenation, isomerization, ring-opening, alkyl and transalkylation. Unsupported Ni-Mo-W hydroupgrading catalysts were prepared by three different preparation methods (dry mixing,wet mix-ing,co-gelling),and tetralin was selected as a model compound to evaluate the hydrogenation and selec-tive ring-opening performance of the catalysts. The results show that the catalyst prepared by co-gelling shows higher hydrogenation conversion of tetralin as well as higher selective ring opening and isomeriza-tion performance than the other two catalysts. The wet mixing catalyst has a high hydrogenation selec-tivity and tetralin conversion rate,but lower in isomerization and ring-opening selectivity. The tetralin conversion rate,the isomerization selectivity and the hydrogenation selectivity are low for the dry mix-ing catalyst. The single molecule mechanism is mainly followed for tetralin hydrogenation and ring-o-pening reactions over the co-gelling and wet mixing catalyst,inducing less heavy products and coke. The unsupported Ni-Mo-W hydroupgrading catalyst prepared by co-gelling shows the desired dearomati-zation performance by selective ring opening.%以 Ni-Mo-W 复合氧化物为活性组分前躯物，采用干混法、湿混法和共胶法分别制得3种不同的非负载型加氢催化剂，以四氢萘为模型化合物对其选择性开环脱芳烃性能进行评价。结果表明：四氢萘的加氢开环过程是由加氢脱氢、异构化、开环作用、脱烷基及烷基转移等反应组成的复杂反应；共胶法催化剂具有较高的加氢活性，四氢萘转化率较高，并且其异构化和开环能力显著高于其它两种催化剂；湿混法催化剂具有较高的加氢选择性，四氢萘转化率较高，但其异构化和开环选择性较低；干混法催化剂作用下的四氢萘转化率、异构化选择性、开环选择性及加氢选择性均较低。采用共胶法和湿混法催化剂时四氢萘加氢开环主要遵循单分子机理，生成重组分的量较少。
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