Hydration of dimethyl ether to methanol over solid acids

Бадмаев, С. Д.; Belyaev, V. D.; Volkova, G. G.; Паукштис, Е. А.; Sobyanin, V. A.

doi:10.1007/s11144-007-5081-9

Cited by 15 publications

(4 citation statements)

References 11 publications

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“…The Lewis acid/weak acid sites in DME carbonylation are inefficient to formation of MA. Hence, methanol, which can be formed at the initial induction stage by the reaction of DME with Bronsted acid sites (H + ) in/on zeolite, or the hydration of DME on Bronsted acid sites, , became the main byproduct. It is worth mentioning here that the H 2 O mainly comes from the carbon deposition reaction, but because of the limited mass transfer of zeolite channel and the quick conversion of carbon depositing precursors to hard carbons, most of the products of carbon deposition reaction cannot be detected by GC analysis.…”

Section: Resultsmentioning

confidence: 99%

A Carbonylation Zeolite with Specific Nanosheet Structure for Efficient Catalysis

Yao

Fan

et al. 2021

ACS Nano

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Up to now, the member of zeolite family has expanded to more than 230. However, only little part of them have been reported as catalysts used in reactions. Discovering potential zeolites for reactions is significantly important, especially in industrial applications. A carbonylation zeolite catalyst Al-RUB-41 has special morphology and channel orientation. The 8-MR channel of Al-RUB-41 is just perpendicular to its thin sheet, making a very short mass-transfer distance along 8-MR. This specific nature endows Al-RUB-41 with efficient catalytic ability to dimethyl ether carbonylation reaction with beyond 95% methyl acetate selectivity. Compared with the most widely accepted carbonylation zeolite catalysts, Al-RUB-41 behaves a much better catalytic stability than H-MOR and a greatly enhanced catalytic activity than H-ZSM-35. A space-confined deactivation mechanism over Al-RUB-41 is proposed. By erasing the acid sites on outer surface, Al-RUB-41@SiO2 catalyst achieves a long-time and high-efficiency activity without any deactivation trend.

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Section: Resultsmentioning

confidence: 99%

A Carbonylation Zeolite with Specific Nanosheet Structure for Efficient Catalysis

Yao

Fan

et al. 2021

ACS Nano

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“…These results are consistent with the catalytic performance of the five MFI zeolites (Table 1). In the hydration of DME using MFI zeolites, no MeOH production was observed at 673 K due to thermodynamic disadvantages, although a high MeOH selectivity was reported at 473-573 K [26,27]. Magomedova et al reported that in the DTO reaction at 593 K, MeOH was selectively produced at <70% DME conversion in the alkene cycle [28].…”

Section: Screening Of Zeolitesmentioning

confidence: 99%

n-Butene Synthesis in the Dimethyl Ether-to-Olefin Reaction over Zeolites

2021

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Zeolite catalysts that could allow the efficient synthesis of n-butene, such as 1-butene, trans-2-butene, and cis-2-butene, in the dimethyl ether (DME)-to-olefin (DTO) reaction were investigated using a fixed-bed flow reactor. The zeolites were characterized by N2 adsorption and desorption, X-ray diffraction (XRD), thermogravimetry (TG), and NH3 temperature-programmed desorption (NH3-TPD). A screening of ten available zeolites indicated that the ferrierite zeolite with NH4+ as the cation showed the highest n-butene yield. The effect of the temperature of calcination as a pretreatment method on the catalytic performance was studied using three zeolites with suitable topologies. The calcination temperature significantly affected DME conversion and n-butene yield. The ferrierite zeolite showed the highest n-butene yield at a calcination temperature of 773 K. Multiple regression analysis was performed to determine the correlation between the six values obtained using N2 adsorption/desorption and NH3-TPD analyses, and the n-butene yield. The contribution rate of the strong acid site alone as an explanatory variable was 69.9%; however, the addition of micropore volume was statistically appropriate, leading to an increase in the contribution rate to 76.1%. Insights into the mechanism of n-butene synthesis in the DTO reaction were obtained using these parameters.

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“…Recently, a WO x /ZrO 2 system was proved to be an active and selective catalyst for the DME hydration to methanol [25]. The catalyst provided the DME conversion close to the equilibrium value and 100% methanol selectivity in the temperature range of 200-300°C, GHSV = 10000 h -1 , and molar ratio H 2 O/DME = 3.…”

Section: Introductionmentioning

confidence: 99%

“…WO x /ZrO 2 was used as a solid-acid catalyst for the DME hydration. The synthesis and catalytic performance of WO x /ZrO 2 in the DME hydration to methanol are given in [25]. The commercial CuZnAlO x catalyst (chemical composition Cu : ZnO : Al 2 O 3 : Cr 2 O 3 = 38 : 28 : 33 : 1.5 wt.%, BET surface area 75 m 2 /g) was used as a catalyst for methanol SR. As special experiments showed, CuZnAlO x is an active and selective catalyst for the methanol SR at 230-300°C and appears to be completely inactive for both the DME SR and DME hydration at temperatures up to 360°C.…”

Section: Introductionmentioning

confidence: 99%

Steam reforming of dimethyl ether to hydrogen-rich gas

Бадмаев

Volkova

Belyaev

et al. 2007

React Kinet Catal Lett

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The steam reforming of dimethyl ether (DME) (SR) to a hydrogen-rich gas over a mechanical mixture of WO x /ZrO 2 (the DME hydration catalyst) and CuZnAlO x (the methanol SR catalyst) was studied. The mechanically mixed catalyst was shown to provide almost complete conversion of DME to the hydrogen-rich gas containing <0.5 vol.% of CO at 300°C, atmospheric pressure, gas hourly space velocity (GHSV) of 10000 h -1 and molar ratio H 2 O/DME = 3. The hydrogen production rate in DME SR was found to reach 180-250 mmol H 2 /(g cat ⋅h) at 250-300°C.

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Hydration of dimethyl ether to methanol over solid acids

Cited by 15 publications

References 11 publications

A Carbonylation Zeolite with Specific Nanosheet Structure for Efficient Catalysis

A Carbonylation Zeolite with Specific Nanosheet Structure for Efficient Catalysis

n-Butene Synthesis in the Dimethyl Ether-to-Olefin Reaction over Zeolites

Steam reforming of dimethyl ether to hydrogen-rich gas

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