介孔ZSM-5沸石的制备及在2-甲基萘甲基化反应中的应用

以γ-氨丙基三乙氧基硅烷(APTES)为硅烷偶联剂，采用硅烷化晶种法制备介孔ZSM-5沸石，并利用XRD、FT-IR、SEM、TEM、N₂吸附-脱附、NH₃-TPD等手段对其进行表征。结果表明，APTES硅烷化晶种法可以合成出具有介孔结构的纯相ZSM-5沸石，该样品为由若干纳米晶粒团聚而成的粒径300~500 nm的球形颗粒，并且可以通过调变APTES加入量来调节ZSM-5沸石的晶粒尺寸及其孔道结构。该介孔ZSM-5沸石催化剂用于2-甲基萘（2-MN）与甲醇烷基化生成2,6-二甲基萘反应中， 2-MN初始转化率为40%(而未加APTES者仅为30%)，反应至10 h，2-MN转化率仍可达32%(而未加APTES者已降至16%)。

Synthesis of Mesoporous ZSM-5 Zeolite and Its Application in Alkylation of 2-Methylnaphthalene with Methanol

Mesoporous ZSM-5 zeolite was synthesized by seed silanization with (γ-aminopropyl)-triethoxysilane (APTES) as the silylating agent, and characterized by XRD, FT-IR, SEM, N₂ adsorption-desorption and NH₃-TPD. The results showed that the ZSM-5 zeolite with mesoporous structure could be obtained by using this synthesis method. The mesoporous ZSM-5 zeolite possessed the crystal morphology with the average particle size in the range of 300~500 nm, which was aggregated by nanocrystals. The crystal size and pore structure of the zeolite could be tuned by varying the amount of APTES in zeolite synthesis. The initial 2-MN conversion of 2-methylnaphthalene methylation with methanol to produce 2,6-dimethylnaphthalene over the mesoporous ZSM-5 zeolite was 40% (30% for non-APTES zeolite). Within 10 h of reaction, the 2-MN conversion was still 32% (16% for non-APTES zeolite).