纳米复合Al_2O_3-Hβ烷基化催化剂的制备及性能评价  

Preparation and Performance Evaluation for Composite Nano-Al_2O_3 -Hβ Alkylation Catalysts

作　　者：姚建辉[1] 段艳[1] 侯凯湖[1] 

机构地区：[1]河北工业大学化工学院,天津300130

出　　处：《石油学报（石油加工）》2013年第4期577-583,共7页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：河北省自然科学基金(B2010000036)资助

摘　　要：采用水热合成晶化法制备了纳米级Hβ分子筛,然后采用机械混捏法制备了纳米复合Al2O3-Hβ烷基化催化剂。采用SEM、NH3-TPD、XRD、Py-IR技术表征了Hβ分子筛和Al2O3-Hβ烷基化催化剂,并以正己烯、正庚烷与混合C4烃类的混合物为模拟原料,在连续高压固定床微反装置中考察了Hβ分子筛的制备条件(晶化方式、n(TEAOH)/n(SiO2)、n(H2O)/n(SiO2))以及Hβ分子筛与拟薄水铝石的质量比(以w(Hβ)表示)对Al2O3-Hβ催化剂烷基化性能的影响。结果表明,在旋转晶化、n(TEAOH)/n(SiO2)为0.3、n(H2O)/n(SiO2)为8、w(Hβ)为80时,所制备的Al2O3-Hβ催化剂表现出良好的烷基化催化性能;在压力2MPa、温度90℃、液时空速2h-1、氢/油体积比10的条件下,烷基化产物收率高达70%,活性稳定时间50h。The nanometer scale Hβ molecular sieves were prepared by the method of hydrothermal synthesis, and then the composite Al2O3-Hβ alkylation catalysts were prepared by the mechanical kneading method, which were characterized by SEM, NH3-TPD, XRD and Py-IR. The effects of the crystallization way, TEAOH/SiO2 molar ratio, H2O/SiO2 molar ratio of Hβ preparation conditions and the mass ratio of Hfl and pseudo boehmite（W（Hβ）） on the alkylation activity of the prepared catalysts were investigated in a continuous high pressure fixed bed reactor with a modeling feed （the mixture of n-hexene, n-heptane and mixed C4-hydrocarbons）. The results showed that the composite Al2O3-Hβ catalyst with w（Hfl） of 80%, and the Hfi prepared under the conditions of the rotating crystallization, TEAOH/SiO2 molar ratio 0.3, H2O/SiO2 molar ratio 8, exhibited good alkylation performance. Under the conditions of pressure 2 MPa, temperature 90℃, LHSV 2 h-1 , H2/Oil volume ratio 10, the alkylation product yield of 70% could be obtained, and the activity of the catalyst could be maintained for 50 h.

关 键 词：纳米Al2O3-Hβ 烷基化 混合C4 

分 类 号：O643.32[理学—物理化学]