Self-assemble NaA Zeolite Membrane And The Design & Application Of H-ZSM-5 Zeolite Capsule Catalyst

Zeolite, one of important catalytic and adsorption materials, were widely used in the world. Zeolite membrane which have all the properties same to zeolite can be obtained by the intergrowth of zeolite on the supports under the zeolite synthesis conditions. Chemical process miniaturization has been the subject of intense research because of the promise of more efficient and cleaner on-site, on-demand, and on-time production. In this thesis, a novel, simple method of nano-crystal self-assemble was offered. Firstly, nano-NaA zeolite self-assembly on the different supports, such as porous stainless steel, porous ceramic plate and silicate plate, were investigated, and then on the stainless steel (SS) palte with microchannles. Using the nano-crystal layer of NaA zeolite in the microchannels as the seeds layer, one defect-free NaA zeolite membrane was synthesized successfully by second growth. The microreactor incorporated with the NaA zeolite membrane SS plate gave a excellent result in the pervaporation experiment. Furthermore, according to the properties of H-ZSM-5 and Fischer-Tropsch synthesis (FTS), a novel zeolite capsule catalyst was designed and used successfully for the direct synthesis of light iso-paraffins from syngas (CO+H₂) via FTS reaction.Using TMAOH (tetramethylammonium hydroxide) as the template, the Si and Al resource came from the Ludox and Al(OiPr)₃ respectively, nano-zeolite NaA with the size of 100nm had been synthesized from the clear solution. TEM and XRD had also been used to characterize the nano-zeolite NaA.Zeolite NaA nano-crystals were readily self-assembled into uniform zeolite layers with high degrees of coverage on the surfaces of different substrates such as porous stainless steel (SS), ceramic and silicon wafer by a simple method employing 3-aminopropyltriethoxysilane (AP-TMS) as linker reagent. The fabrication process involves two steps: (1) surface functionalization by immersion of the substrate into the ethanol solution with linker reagent in an autoclave at 373K for 3h; (2) zeolite deposition by immersion of the functionalized substrate into the nano-zeolite suspension in ethanol under the same condition to above step. A continuous, intergrown, uniform zeolite membrane was obtained on the seeded substrate by the secondary growth. Influence of three linkers including 3-chloropropyltriethoxysilane (CP-TMS), 3-mercaptopropyltriethoxysilane (SP-TMS) and AP-TMS for the zeolite crystals self-assembly on the substrates was investigated. It has been found that using CP-TMS as...