Compound Carrier Load Tungsten Base Catalyst Preparation And Catalysis Performance Study

In recent years, with the rapid economic development, and oil-related products has increased continuously. Gasoline consumption is even more alarming rate, resulting in air pollution are getting worse. As an important means to improve the octane number of gasoline, alkanes isomerization research has become increasingly active efforts are being made research and development of high activity, high stability, both for alkanes isomerization can also be an excellent catalyst for industrialization, which for raising gasoline quality, reduce environmental pollution and improve the environment for human survival has an important practical significance.In this paper, the sol-gel method, coprecipitation of the TiO₂-Al₂O₃, ZrO₂-Al₂O₃ two kinds of complex oxides in order to TiO₂-Al₂O₃, ZrO₂-Al₂O₃ as the carrier prepared by the load of nickel and tungsten oxide bifunctional catalyst, investigated isomerization of n-heptane on these catalysts, discussed the effect of different preparation conditions, reduction conditions and reaction conditions on the conversion and isomerization selectivity of n-heptane. The main contents of the thesis were discussed as follows:For the Ni-WO₃/TiO₂-Al₂O₃ catalyst, it is found that the conversion of n-heptane and isomerization selectivity to i-heptane can reach 15.50% and 84.06% on Ni-WO₃/TiO₂-Al₂O₃ catalyst when reduction temperature is 500℃, flow rate of H2 is 60 ml/min, reduction time is 6 h, WO₃ content of the catalyst is 25%, Ni content is 10%, n(TiO₂)/n(Al₂O₃) is 2, calcination temperature of WO₃/TiO₂-Al₂O₃ is 500℃, reaction temperature is 315℃, n(H2)/n(n-Heptane) is 13.17 and WHSV is 6.15 h?1.The isomerization of n-heptane on Ni-WO₃/ZrO₂-Al₂O₃ catalysts was investigated. The result showed that the conversion of n-heptane and isomerization selectivity to i-heptane can reach 27.32% and 79.13% on Ni-WO₃/ZrO₂-Al₂O₃ catalyst when WO₃ content of the catalyst is 20%, Ni content is 12%, Al₂O₃ content is 10%, reduction temperature is 525℃, reduction time is 5 h, calcination temperature of WO₃/ZrO₂-Al₂O₃ is 750℃, reaction temperature is 230℃, n(H2)/n(n-Heptane) is 15.80, and WHSV is 4.07 h?1.