Ni-WO3/ZrO2固体强酸催化剂的制备及催化正庚烷异构化反应性能

采用浸渍法制备了以具有一定晶相结构的ZrO₂为载体的Ni-WO₃/ZrO₂系列固体强酸催化剂。采用XRD、BET、NH₃-TPD 等方法测定了Ni-WO₃/ZrO₂系列催化剂的晶相结构和表面酸性，并考察了其在正庚烷异构化反应中的催化性能。结果表明，Ni的引入使得Ni-WO₃/ZrO₂催化剂由具有单一酸中心催化功能的催化剂变成由酸中心与金属中心共同催化的双功能催化剂，其催化性能显著提高。在n(H₂)/n(n-C₇H₁₆)=12、MHSV=3.52 h^-1、m(Cat)=0.3 g、反应温度300℃条件下，载体焙烧温度800℃所制备的5%Ni-15%WO₃/ZrO₂催化剂催化正庚烷异构化反应的转化率可达39.96%，异庚烷的选择性可达94.79%。

Preparation of Ni-WO3/ZrO2 Solid Acid Catalyst and Its Catalytic Performance for n-Heptane Hydroisomerization

A series of Ni-WO₃/ZrO₂ catalysts were prepared by impregnation method. Their crystal structure and acidity were determined by XRD, BET, NH₃-TPD . The catalytic performance of the Ni-WO₃/ZrO₂ samples for the n-heptane isomerization under different conditions was studied. The results showed that the addition of Ni made the Ni-WO₃/ZrO₂  catalyst with only acid active sites becoming a bi-function catalyst of acid and metal active sites, which had a good catalytic performance for n-heptane hydroisomerization. Under the conditions of n(H₂)/n(n-C₇H₁₆)=12, MHSV=3.52 h^-1, m(Cat)=0.3 g, reaction temperature of 300℃, and with the 5%Ni-15%WO₃/ZrO₂ as catalyst, whose supporter was calcined at 800℃, the conversion of n-heptane isomerization and its selectivity to i-heptane could reach 39.96% and 94.79%, respectively.