The Effect of Additional Zeolites in Amorphous Silica鈥揂lumina Supports on Hydrocracking of Semirefined Paraffinic Wax

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• 作者：Jian Jiang ; Zhaohui Dong ; Haoyi Chen ; Jibing Sun ; Chao Yang ; Fahai Cao
• 刊名：Energy & Fuels
• 出版年：2013
• 出版时间：February 21, 2013
• 年：2013
• 卷：27
• 期：2
• 页码：1035-1039
• 全文大小：378K
• 年卷期：v.27,no.2(February 21, 2013)
• ISSN：1520-5029

文摘

The amorphous SiO₂鈥揂l₂O₃ supports (SA-x) with different SiO₂ weight ratios (x) were prepared by a sol鈥揼el method. The NiW active components were loaded over the supports using an organic matrix combustion method. Semirefined 56# wax was used as the model feedstock of F-T synthetic wax for hydrocracking in a single fixed-bed reactor. The started reaction was conducted at the temperature of 380 掳C, 3.5 MPa of pressure, WHSV = 1 h^鈥?, and H₂/wax = 0.12 wt/wt. Acidities of the catalysts were determined by TPD-NH₃, and the results indicated that the SA-0.4 sample had the highest yield of middle distillate and a promising conversion rate that had a good relation with the strength of the medium acid sites. TEM showed that metal was dispersed very well on the supports using the organic matrix combustion method. Further, SA-0.4 supports were modified with H-尾 and HZSM-5 zeolites materials and were prepared with different reaction conditions. The prepared supports were denoted as 尾-SA-y and HZSM-SA-z, respectively, where y and z represent the weight percentage of 尾 zeolite and HZSM-5 zeolite. It was found that 尾-SA-0.2 had comparable results with SA-0.4 samples, while the reaction temperature was 60 掳C lower. The HZSM-SA-z series catalysts showed higher activity, whereas the selectivity of middle distillates was significantly lower, and the yield of gas was too high.