Effect of Zr Incorporation on Mordenite Catalyzed Dimethyl Ether Carbonylation

Zhao, Peng; Qian, Weixin; Ma, Hongfang; Sheng, Haibing; Zhang, Haitao; Ying, Weiyong

doi:10.1007/s10562-020-03359-w

Cited by 6 publications

(3 citation statements)

References 46 publications

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“…As the Ag ion exchange concentration increased, the area of the desorption peak increased significantly and moved to the low-temperature region. Combined with the NH3-TPD results, we speculate that the moderate acid sites generated after silver modification provided new sites for CO adsorption [35,52], and the adsorption performance of MOR to CO was greatly enhanced. This helped improve the DME carbonylation performance of the catalyst.…”

Section: Catalystmentioning

confidence: 62%

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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Section: Catalystmentioning

confidence: 62%

Silver-Modified Nano Mordenite for Carbonylation of Dimethyl Ether

Qian

et al. 2021

Catalysts

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“…The decrease in strong acid strength has the potential to inhibit side reactions, minimize carbon formation, and prolong the catalyst lifespan, consistent with the results of the carbonylation activity test. As can be seen in Figure 5, the high-temperature desorption peak for the Co•Fe•DL-HMOR sample slightly shifts to a lower temperature, suggesting that additional metal Lewis acidic sites (LAS) are generated after the modification treatment with the DL complex cobalt-iron bimetal, which enhances the acidic sites of the zeolite [29]. This increase in acidic sites contributes to the heightened conversion rate of DME, consistent with the results of the carbonylation activity test.…”

Section: Bet Testmentioning

confidence: 95%

“…Pyridine, with a kinetic diameter of 0.585 nm, can enter the 12 MR channel of mercerized zeolite. However, it cannot enter its 8 MR channel [29,31]. Pyridine can only adsorb to the outer surface of HMOR and the acidic sites within the 12 MR pores [32].…”

Section: Py-ir Analysismentioning

confidence: 99%

Enhanced Stability of Dimethyl Ether Carbonylation through Pyrazole Tartrate on Tartaric Acid-Complexed Cobalt–Iron-Modified Hydrogen-Type Mordenite

Fu,

Dong

2024

Molecules

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In this study, pyrazole tartrate (Pya·DL) and tartaric acid (DL) complexed with cobalt–iron bimetallic modified hydrogen-type mordenite (HMOR) were prepared using the ion exchange method. The results demonstrate that the stability of the dimethyl ether (DME) carbonylation reaction to methyl acetate (MA) was significantly improved after the introduction of Pya·DL to HMOR. The Co∙Fe∙DL-Pya·DL-HMOR (0.8) sample exhibited sustainable stability within 400 h DME carbonylation, exhibiting a DME conversion rate of about 70% and MA selectivity of above 99%. Through modification with the DL-complexed cobalt–iron bimetal, the dispersion of cobalt–iron was greatly enhanced, leading to the formation of new metal Lewis acidic sites (LAS) and thus a significant improvement in catalysis activity. Pya·DL effectively eliminated non-framework aluminum in HMOR, enlarged its pore size, and created channels for carbon deposition diffusion, thereby preventing carbon accumulation and pore blockage. Additionally, Pya·DL shielded the Bronsted acid sites (BAS) in the 12 MR channel, effectively suppressing the side reactions of carbon deposition and reducing the formation of hard carbon deposits. These improvements collectively contribute to the enhanced stability of the DME carbonylation reaction.

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Impact of Various Silicon Sources on the Synthesis of Mordenite and Differences in the Carbonylation Reaction of Dimethyl Ether

Chen,

Wang,

et al. 2024

Chem. Res. Chin. Univ.

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Effect of Zr Incorporation on Mordenite Catalyzed Dimethyl Ether Carbonylation

Cited by 6 publications

References 46 publications

Silver-Modified Nano Mordenite for Carbonylation of Dimethyl Ether

Silver-Modified Nano Mordenite for Carbonylation of Dimethyl Ether

Enhanced Stability of Dimethyl Ether Carbonylation through Pyrazole Tartrate on Tartaric Acid-Complexed Cobalt–Iron-Modified Hydrogen-Type Mordenite

Impact of Various Silicon Sources on the Synthesis of Mordenite and Differences in the Carbonylation Reaction of Dimethyl Ether

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