费托合成产物中低碳直链烷烃经加氢异构化后，产物可用于优质高辛烷值汽油,是实现煤炭资源清洁化利用的一种重要手段。通过调控MOR沸石晶体碱溶解程度，以沸石溶解液为硅铝源合成介孔MCM-41，采用重结晶法制备了一系列MOR/MCM-41微-介孔复合材料，与金属活性组分离子交换后得到MOR/MCM-41为载体的Pt系催化剂，并选取正己烷为费托低碳烃模型化合物进行加氢异构化性能评价。分别通过SEM、TEM、吡啶红外、XRD、BET、氮气吸脱附等手段表征复合材料形貌、孔道结构及理化性质，表征结果表明，经过原位重结晶改性后，MOR晶粒粒径减小，外表面成功包覆MCM-41材料，吸附性能得到改善，适当的碱处理能够改善MOR沸石的颗粒易聚集现象，调变了Brønsted酸和Lewis酸的比值，弱酸量基本不变而中强酸量显著减少。加氢异构化性能评价结果表明，在反应温度为200~280 ℃，转化率随反应温度的升高而升高，且在相同转化率水平下，具有较高的正己烷加氢异构化选择性。随碱处理浓度增大，异构产物的选择性得到提高，且裂化程度减弱，主要归因于复合材料碱处理对MOR颗粒的分散作用与重结晶合成MCM-41带来的扩孔效果，通过调变催化剂孔道结构，缩短反应物分子与活性中心间传质路径，提高异构化催化性能。通过制备微-介孔复合材料并建立改性体系，可在相近转化率水平下提高正己烷加氢异构化的选择性。本研究为低碳正构烷烃加氢异构化催化剂载体的制备提供参考依据，有望通过对介孔复合的调控实现异构产物的高效转化。

Hydroisomerization of the low carbon straight chain alkanes in the products of F-T synthesis,which could be used in high quality gasoline with high octane number,is promising to realize clean utilization of coal resources. Here- in,a series of MOR / MCM-41 micro-mesoporous composites are prepared by in-situ recrystallization method,with the degree of alkali dissolution of MOR zeolite crystals being controlled and the mesoporous MCM-41 being synthesized by using zeolite solution as Si and Al sources. A series of Pt-loaded catalysts are obtained by ion exchange and impregna- tion of metal active components,and n-hexane is selected as the model compound of F-T low carbon n-alkanes for hydroisomerization performance evaluation. TEM, SEM, XRD, BET, Pyridine-IR, and N2 adsorption-desorption iso- therms measurements are introduced to characterize the morphologies,structures and chemical and physical properties of the hybrids. After in-situ recrystallization modification,the grain size of MOR crystals decrease,the outer surface of MOR is coated with MCM-41,and the adsorption performance of MOR is improved,which indicates that appropriate al- kali treatment could reduce the particle aggregation of MOR zeolite and adjust the ratio of Brönsted acid to Lewis acid. In catalytic performance evaluation,the conversion rate of n-hexane increases when the reaction temperature is in- creased from 200 ℃ to 280 ℃ . With the increasing of the alkali treatment concentration,the selectivity of isomer prod- ucts is improved,and the degree of cracking is reduced,mainly due to the composite alkali treatment effect on MOR particle dispersion. Additionally,the synthesis method of MCM-41 could expand the channels through adjusting the cat- alyst pore structure and shorten the mass transfer path between the reactant molecules and the active center,also con- tributes to the selectivity improvement. The selectivity of n-hexane hydroisomerization can be improved by preparing micro-mesoporous composites and setting up a modified system. This study will provide reference for more efficient conversion of low carbon n-alkanes hydroisomerization.