DME carbonylation over a HSUZ-4 zeolite

Xiong, Zhiping; Zhan, Ensheng; Li, Mingrun; Shen, Wenjie

doi:10.1039/d0cc00886a

Cited by 32 publications

(32 citation statements)

References 43 publications

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“…At Si : Al > 39 with the most stable skeleton as the structure, by choosing the desorption temperature larger than 850 K (strong Brønsted acid site), we found that 24 zeolites hit the target. Among them, 11 zeolites (ATT, BIK, EON, GOO, JBW, MAZ, MON, MOR, SZR, THO and WEN) were already synthesized in the form of aluminosilicate with high Si : Al ratio (Si : Al > 5) where 4 of them (BIK, 98 MAZ, 99 MOR 93 and SZR 100 ) have indeed been reported to have strong Brønsted acid sites.…”

Section: Advanced Zeolite Applications Using ML Potentialsmentioning

confidence: 99%

Machine learning potential era of zeolite simulation

Liu

2022

Chem. Sci.

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Section: Advanced Zeolite Applications Using ML Potentialsmentioning

confidence: 99%

Machine learning potential era of zeolite simulation

Liu

2022

Chem. Sci.

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“…No existence of a larger channel system leads to a low mass-transfer efficiency for EU-12, and this is the reason why this catalyst shows a low DME conversion (<24%) even at a higher reaction temperature of 240 °C. Shen et al 20 In 2005, a high-silica zeolite Ruhr University Bochum-fortyone (RUB-41) with a 2D pore system of intersecting 8-MR (5.0 × 2.7 Å) and distorted 10-MR (6.5 × 4.0 Å) channels, framework type code RRO, was synthesized by Gies et al 22 via calcination of another layered silicate RUB-39. During the calcination process, the 2D pore system of RUB-41 was situated in the interlayer space through topotactic condensation of RUB-39.…”

Section: Introductionmentioning

confidence: 99%

“…No existence of a larger channel system leads to a low mass-transfer efficiency for EU-12, and this is the reason why this catalyst shows a low DME conversion (<24%) even at a higher reaction temperature of 240 °C. Shen et al reported that SUZ-4 zeolite can give comparable DME conversion and stability to ZSM-35 in the DME carbonylation reaction. Most recently, SSZ-13 zeolite, as uncovered by Davis et al, realized catalyzing DME carbonylation at a much lower temperature of 165 °C.…”

Section: Introductionmentioning

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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“…Currently, catalysts for this process are mainly divided into two types: zeolite catalysts (such as mordenite (MOR) [5], ZSM-35 [6], ZSM-5 [7], and HFER [8,9]) and heteropoly acid catalysts [10,11]. In recent years, EU-12 [12], SSZ-13 [13], and HSUZ-4 [14] zeolites have also been used in this reaction. However, owing to its unique structure and properties, MOR occupies an important position in the DME carbonylation reaction.…”

Section: Introductionmentioning

confidence: 99%

Silver-Modified Nano Mordenite for Carbonylation of Dimethyl Ether

Qian

et al. 2021

Catalysts

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Mordenite (H-MOR) catalysts were synthesized by a hydrothermal method, and silver-modified mordenite (Ag-MOR) catalysts were prepared by ion exchange with AgNO3 at different concentrations. The performance of these catalysts in the carbonylation of dimethyl ether (DME) to methyl acetate (MA) was also evaluated. The catalysts were characterized by Ar adsorption/desorption, XRD, ICP-AES, SEM, HRTEM, 27Al NMR, H2-TPR, NH3-TPD, Py-IR, and CO-TPD. According to the characterization results, Ag ion exchange sites were mainly located in the 8-membered ring (8-MR) channels of Ag-MOR; evenly dispersed Ag2O particles were also present. The acid site distribution was changed by the modification of Ag, and the amount of Brønsted acid sites increased in 8-MR and decreased in 12-MR. The CO adsorption performance of the catalyst significantly increased with the modification of Ag. These changes improved the conversion and selectivity of the carbonylation of DME. Over 4Ag-MOR in particular, DME conversion and MA selectivity reached 94% and 100%, respectively.

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DME carbonylation over a HSUZ-4 zeolite

Abstract: Molecule diffusion through the abundant 8-MR pore openings on the side surfaces of a HSUZ-4 rod facilitated DME carbonylation.

Cited by 32 publications

References 43 publications

Machine learning potential era of zeolite simulation

Machine learning potential era of zeolite simulation

A Carbonylation Zeolite with Specific Nanosheet Structure for Efficient Catalysis

Silver-Modified Nano Mordenite for Carbonylation of Dimethyl Ether

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