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- W70592034 abstract "Abstract Coking of HZSM-5 samples of polycrystalline spherical and polyhedral morphology was studied during n-hexane and mesitylene cracking. By measuring the influence of coke deposits on molecular self-diffusion, it is possible to distinguish between intracrystalline and surface coke. Coking with n-hexane exhibits two periods: During an initial period, coke is deposited in the intracrystalline channel network and during the final period, coke is deposited mainly near the external surface of the zeolite crystals. In contrast, coke from mesitylene is predominantly deposited near the external surface from the very beginning of the cracking reaction. Combining this finding with the measurement of the chemisorption of pyridine on coked samples, via the loss of acidity it is demonstrated that coking of HZSM-5 causes a combination of pore blocking and acid site poisoning. From comparing HZSM-5 samples of polycrystalline structure and polyhedral morphology, it is concluded, that in addition to the first order pores of the regular zeolite channel network, polycrystalline grains contain second order pores. The second order pores exhibit two remarkable properties: self-diffusion is enhanced, and coke is deposited preferentially within them." @default.
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- W70592034 date "1987-01-01" @default.
- W70592034 modified "2023-10-17" @default.
- W70592034 title "Coke Deposition on HZSM-5 type Zeolites" @default.
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- W70592034 doi "https://doi.org/10.1016/s0167-2991(09)60372-4" @default.
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