Alow-costroute To Mesostructured TS-1zeolite And Sapo-34for Efficient Catalytic Conversionof Bulk Molecules

Microporous zeolite has a characteristic of regulatory pore channeland high hydrothermal stability, and show excellent catalytic activity ascatalyst or supporter so that it has a great use in petrochemicalengineering and fine chemical. But its small pore size restricts itsapplication as catalyst when the reactant size was larger than themicropore size. Compared with conventional microporous zeolite, thelarger pore size in mesoporous zeolite was in favor of large molecular.However, the amorphous wall of mesopore result in low hydrothermalstability and not good catalytic performance. Therefore, scholars aroundthe world make so much effort to synthesize mesoporous zeolitecontaining micropore structure.TS-1zeolite is derivative of Silicalite-1, having great importance inoxidation and epoxidation of organic molecule, which arouse wideattention. But both the small pore size and high cost impose restriction onits application in industry. Recently, many pursers in hierarchical porousmaterials field devoted themselves to synthesize hierarchical TS-1zeolite at low cost which combine the advantages of microporous andmesoporous zeolite.Although there were some reported hierarchical TS-1zeolites, they were mostly synthesized in high cost or the Ti species werepoorly introduced into the zeolite framework. Herein, we designed afacile, ultra-low-cost route to synthesize TS-1zeolite with intracrystallinemesopores by using cheap inorganic silicon and titanium sources andcheap meso-structure directing template under the help of directing agent.The synthesized hierarchical TS-1(HTS-1) has oval spherical withuniform size, and large specific surface area, mesopore size and mesoporevolume. Meanwhile, the HTS-1show high catalytic activity in conversionof large organic sulfide, such as dibenzothiophen (DBT) and benzylphenyl sulfide (BPS).As the core factor of MTO reaction, the SAPO-34zeolite is hotresearch for its good performance in CH3OH conversion and highselectivity in reaction product. Just as most microporous zeolite, the smallpore size was easily blocked up by the carbon deposition resulting inharassment in industry. There was little development in synthesizinghierarchical SAPO-34zeolite in spite of so much attention frominvestigators. We synthesized hierarchical SAPO-34zeolite (HSAPO-34)using silicasol and pseudoboehmite as silicon and aluminium sources,with the template of diethylamine (DEA) and organosilane DM-3010.The synthesized Hsap-34has a shape of slabs with uniform size,and large specific surface area, mesopore size and mesopore volume. TheHSAPO-34show high catalytic activity in hydrodesulfurization of largeorganic sulfide,such as dibenzothiophen (DBT),in the fixed bed reactor.