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• W2946562910 abstract "The evolution and distribution of products during the reaction of dimethyl ether-to-olefins on SAPO-34 were studied in a fixed-bed reactor at different severities ranging from 0.2 to 20 h–1. Thereby, the time scale of deactivation at low severities smaller than 1 h–1 is slow enough for online gas chromatography (GC) to give detailed information on changes of the product distribution and the reaction network. However, at higher and commercially relevant severities >1 h–1, the time scale of deactivation becomes too fast to be adequately followed by online GC. In order to follow the rapidly changing reaction products, FTIR spectroscopy in the gas phase was applied in measurement intervals down to 5 s. Multivariate analysis of the FTIR spectra and correlation to the online product analysis by GC was used for in situ training of chemometrical models for all major products between C1 and C5. These models were used for the prediction of product selectivities from the FTIR spectra in high time resolution giving valuable insights into the product formation during the induction, steady-state, and deactivation periods of the catalyst. The results indicate that the product distribution on SAPO-34 depends on the time-on-stream (TOS) deactivation and coke content. Partially burning-off the coke on the catalyst further demonstrated that the remaining coke on the catalyst is linked to the product distribution and that a certain selectivation by the coke is required to yield the maximum olefins selectivity. Finally, the temperature and severity were varied in a short design of experiments (DoE), showing the influence of these parameters on product distribution and conversion capacity." @default.
• W2946562910 created "2019-05-29" @default.
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• W2946562910 date "2019-05-13" @default.
• W2946562910 modified "2023-09-25" @default.
• W2946562910 title "Time-Resolved Product Analysis of Dimethyl Ether-to-Olefins Conversion on SAPO-34" @default.
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• W2946562910 doi "https://doi.org/10.1021/acscatal.9b00765" @default.
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