Adsorption, diffusion and catalysis of mesostructured zeolite HZSM-5 |
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Authors: | Zhiping Liu Weiming Fan Jinghong Ma Ruifeng Li |
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Institution: | 1. College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan, 030024, China 2. Key Laboratory of Coal Science and Technology MOE, Institute of Special Chemicals, Taiyuan, 030024, China
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Abstract: | Adsorption and diffusion properties of n-octane in meso-structured HZSM-5 zeolites were studied by high precision intelligent gravimetric analysis (IGA) and ZLC technology between 293?K and 393?K. As expected, great increase in adsorption capacity and diffusion efficient of n-octane in the mesostructured HZSM-5 zeolites was observed compared with conventional HZSM-5. At the same time, the adsorption activation energy of n-octane in the mesostructured HZSM-5 zeolites was significantly decreased. The adsorption heats with low n-octane loading showed a clear decline with increase of mesoporosity in the zeolite samples. These results clearly indicate that introduction of mesopores into the zeolites offered a short diffusion path and high diffusion rate for reactants and products, which resulted in a high yield of fuel oil and an enhanced resistance against the catalyst deactivation in the reaction of methanol to gasoline. |
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