2021
DOI: 10.21577/0103-5053.20210008
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Porosity of CHA Zeolite Driving the Formation of Polyaromatic Coke Species in the Methanol to Olefins Reaction

Abstract: The pore size of the chabazite structure is exceptionally suitable for the methanol to olefins (MTO) reaction. The reaction has an induction period required for the formation of a hydrocarbon pool (HP), usually composed of aromatic compounds of different sizes. HP is alkylated by methanol and afterward cracked, leading to the formation of olefins. Despite the importance of HP, its formation and growth in size are exceedingly dependent on the porosity of the catalyst. The ideal is that the formed HP remains sta… Show more

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Cited by 3 publications
(4 citation statements)
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“…This assumption is supported by the SEM images of both samples, where the particles of the CHA-14 sample are smaller and more polydisperse than particles of the CHA-7.5 sample. The volume of micropores and the BET area for our samples correspond to previously published values for MFI [42,43] and CHA zeolites [44,45].…”
Section: Materials Characterizationsupporting
confidence: 86%
See 1 more Smart Citation
“…This assumption is supported by the SEM images of both samples, where the particles of the CHA-14 sample are smaller and more polydisperse than particles of the CHA-7.5 sample. The volume of micropores and the BET area for our samples correspond to previously published values for MFI [42,43] and CHA zeolites [44,45].…”
Section: Materials Characterizationsupporting
confidence: 86%
“…Desorbed compounds in outlet gas were detected using the mass spectrometer OmniStar GSD 320 (Pfeiffer Vacuum GmbH, Aßlar, Germany). Masses m/e = 4, 17,18,26,28,29,31,32,44,45,46,59 and 74 were simultaneously monitored. Response factors for ethanol, ethylene and diethylether to these masses were obtained by syringe calibration doses of pure compounds.…”
Section: Fixed Bed Ethanol Dehydration Reaction Testsmentioning
confidence: 99%
“…SAPOs are zeotypes that emerged from the introduction of silicon in the structure of aluminophosphates, showing a high tolerance to incorporation of cations that silicoaluminophosphates have, as well as their moderate acidity, highly effective in methanol to olefin (MTO) conversion reactions [5][6][7][8] and hydroisomerization of alkanes [9][10][11][12] .…”
Section: Introductionmentioning
confidence: 99%
“…The superficial zeolite modification using NH 4 Cl and a subsequent thermal treatment have been utilized to tailor synthetic chabazites for the thermal degradation of high-density polyethylene to low molecular mass hydrocarbons [40] and the adsorption of ethane (41 mg/g) and propane (81 mg/g) [41]. This material had been also employed as a catalyst in the methanol to olefins reaction (forming polyaromatic coke species) [42]. However, this approach has not been applied to improve the chabazite properties for the adsorption of anionic pollutants from water.…”
Section: Introductionmentioning
confidence: 99%