Methanol Conversion to Hydrocarbons (MTH) Over H-ITQ-13 (ITH) Zeolite

Skistad, Wegard; Teketel, Shewangizaw; Bleken, Francesca Lønstad; Beato, Pablo; Bordiga, Silvia; Nilsen, Merete Hellner; Olsbye, Unni; Svelle, Stian; Lillerud, Karl Petter

doi:10.1007/s11244-013-0170-7

Cited by 22 publications

(17 citation statements)

References 56 publications

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“…31,159,163,247,447,[512][513][514][515][516][517][518][519][520][521][522][523][524][525][526][527][528][529][530][531] Framework trivalent heteroatoms (Al, Fe, Ga, In, and B) are responsible for Brønsted activity (see Section 2) of different strengths. Other examples of isomorphic substitution of framework silicon atoms are iron, titanium, gallium, germanium, boron, vanadium and tin.…”

Section: Heteroatoms Substituted In Framework T Positionsmentioning

confidence: 99%

Probing zeolites by vibrational spectroscopies

et al. 2015

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This review addresses the most relevant aspects of vibrational spectroscopies (IR, Raman and INS) applied to zeolites and zeotype materials. Surface Brønsted and Lewis acidity and surface basicity are treated in detail. The role of probe molecules and the relevance of tuning both the proton affinity and the steric hindrance of the probe to fully understand and map the complex site population present inside microporous materials are critically discussed. A detailed description of the methods needed to precisely determine the IR absorption coefficients is given, making IR a quantitative technique. The thermodynamic parameters of the adsorption process that can be extracted from a variable-temperature IR study are described. Finally, cutting-edge space- and time-resolved experiments are reviewed. All aspects are discussed by reporting relevant examples. When available, the theoretical literature related to the reviewed experimental results is reported to support the interpretation of the vibrational spectra on an atomic level.

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Section: Heteroatoms Substituted In Framework T Positionsmentioning

confidence: 99%

Probing zeolites by vibrational spectroscopies

et al. 2015

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“…In full accordance with this observation, switching 12 The dual cycle concept has been considered the state of the art in the mechanistic understanding of the MTH reaction since 2007. Originally, it was proposed over H-ZSM-5, but the mechanism has been successfully used to explain the operation and product distribution of many other zeolitic structures in the MTH reaction [138][139][140][141][142][143][144][145][146][147][148][149]. Many studies have attempted to correlate the characteristics of the catalyst (especially topology and acidity) with the relative propagation of the two catalytic cycles, which is fundamental to understand the effluent product selectivities.…”

Section: Autocatalytic Stage Of the Mth Reactionmentioning

confidence: 99%

Benzene co-reaction with methanol and dimethyl ether over zeolite and zeotype catalysts: Evidence of parallel reaction paths to toluene and diphenylmethane

Martínez-Espín

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Erichsen

et al. 2017

Journal of Catalysis

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“…Recently, besides the CHA framework, other small-pore zeolites, such as LEV, DDR, AEI, RHO, KFI, ITH and AFX, have also been identified as interesting candidates for the MTO process. 6 − 14 Small differences in the framework topology of these small-pore zeolites can have a large effect on both product selectivity and the intermediate species involved in the MTO process. 6 , 15 , 16 For instance, DDR catalysts exhibit a high selectivity toward ethylene and propylene over C 2 and C 3 paraffins due to their pore structure.…”

Section: Introductionmentioning

confidence: 99%

Insights into the Activity and Deactivation of the Methanol-to-Olefins Process over Different Small-Pore Zeolites As Studied with Operando UV–vis Spectroscopy

et al. 2017

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The nature and evolution of the hydrocarbon pool (HP) species during the Methanol-to-Olefins (MTO) process for three small-pore zeolite catalysts, with a different framework consisting of large cages interconnected by small eight-ring windows (CHA, DDR, and LEV) was studied at reaction temperatures between 350 and 450 °C using a combination of operando UV–vis spectroscopy and online gas chromatography. It was found that small differences in cage size, shape, and pore structure of the zeolite frameworks result in the generation of different hydrocarbon pool species. More specifically, it was found that the large cage of CHA results in the formation of a wide variety of hydrocarbon pool species, mostly alkylated benzenes and naphthalenes. In the DDR cage, 1-methylnaphthalene is preferentially formed, while the small LEV cage generally contains fewer hydrocarbon pool species. The nature and evolution of these hydrocarbon pool species was linked with the stage of the reaction using a multivariate analysis of the operando UV–vis spectra. In the 3-D pore network of CHA, the reaction temperature has only a minor effect on the performance of the MTO catalyst. However, for the 2-D pore networks of DDR and LEV, an increase in the applied reaction temperature resulted in a dramatic increase in catalytic activity. For all zeolites in this study, the role of the hydrocarbon species changes with reaction temperature. This effect is most clear in DDR, in which diamantane and 1-methylnaphthalene are deactivating species at a reaction temperature of 350 °C, whereas at higher temperatures diamantane formation is not observed and 1-methylnaphthalene is an active species. This results in a different amount and nature of coke species in the deactivated catalyst, depending on zeolite framework and reaction temperature.

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Methanol Conversion to Hydrocarbons (MTH) Over H-ITQ-13 (ITH) Zeolite

Cited by 22 publications

References 56 publications

Probing zeolites by vibrational spectroscopies

Probing zeolites by vibrational spectroscopies

Benzene co-reaction with methanol and dimethyl ether over zeolite and zeotype catalysts: Evidence of parallel reaction paths to toluene and diphenylmethane

Insights into the Activity and Deactivation of the Methanol-to-Olefins Process over Different Small-Pore Zeolites As Studied with Operando UV–vis Spectroscopy

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