Ordered mesopores have been constructed outside MTT zeolite for efficient hydroisomerization. Micro/mesoporous H-SSZ-32@MCM-41 composite with tunable size of mesopore have been prepared by alkali treatment and surfactant-directed reorganization. Alkyltrimethylammonium bromide with different chain length was employed to control the structure of mesopores. XRD, TEM, ²⁷Al MAS NMR, NH₃-TPD, N₂-adsorption/desorption, and in situ FTIR were used to elucidate the structure, pore properties and acidity. The mesopore channels are parallel to the MTT micropore channels along the a-axis direction, and the mesopores are connected with the micropores at the a-axis port of H-SSZ-32 core. The as-fabricated core-shell composites possess increased specific surface area and decreased ratio of Bronsted acidity/Lewis acidity (B/L). The obtained bifunctional catalysts of Pt/H-SSZ-32@MCM-41 exhibit higher yield of isomers and lower selectivity for cracking products than conventional Pt/H-SSZ-32 for the hydroisomerization of n-hexadecane. A sequential reaction network was determined by examining the selectivity plots of differing orders. The kinetic behaviors of n-hexadecane hydroisomerization on microporous Pt/H-SSZ-32 and micro/mesoporous Pt/H-SSZ-32@MCM-41 were studied systematically, and kinetic models were established by data regression. Finally, the mechanism of the hydroisomerization of long-chain n-paraffins on the core-shell zeolite has been discussed.

为了有效的加氢异构化，已在MTT沸石外构建了有序的中孔。通过碱处理和表面活性剂定向重组制备了具有可调介孔尺寸的微孔/介孔H-SSZ-32 @ MCM-41复合材料。采用不同链长的烷基三甲基溴化铵控制中孔的结构。XRD，TEM，²⁷ Al MAS NMR，NH ₃ -TPD，N _2-吸附/解吸和原位FTIR用于阐明结构，孔性能和酸度。中孔通道平行于沿所述MTT微孔通道一轴方向，和中孔与在所述微细孔连接一个H-SSZ-32核心的轴端口。所制造的核-壳复合材料具有增加的比表面积和降低的布朗斯台德酸度/路易斯酸度（B / L）比。与传统的Pt / H-SSZ-32的正十六烷加氢异构化反应相比，所获得的Pt / H-SSZ-32 @ MCM-41的双功能催化剂显示出更高的异构体收率和更低的裂解产物选择性。通过检查不同顺序的选择性图确定了顺序反应网络。系统研究了正十六烷加氢异构化在微孔Pt / H-SSZ-32和微孔/中孔Pt / H-SSZ-32 @ MCM-41上的动力学行为，并通过数据回归建立了动力学模型。最后，长链正丁烯的加氢异构化机理已经讨论了核-壳沸石上的石蜡。