Mg enhances the catalytic selectivity and stability of mordenite for carbonylation of dimethyl ether

Hong, Zhe; Lv, Jiangang; Chen, Chong; Zhao, Guoqing; Miao, Lei; Yang, Weimin; Zhu, Zhirong

doi:10.1016/j.apcata.2022.118928

Cited by 6 publications

(2 citation statements)

References 47 publications

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“…FTIR was applied to detect the acid distribution. As shown in Figure b, the FTIR spectrum in the hydroxyl region was deconvoluted into three separate peaks (3668, 3635, and 3590 cm –1 ) and assigned to extraframework alumina, Brønsted acid sites in 12-MR, and Brønsted acid sites in 8-MR in the order of wavenumber. − The peak areas of 12-MR and 8-MR Brønsted acid sites ( B 12‑MR and B 8‑MR ) were integrated, and the ratios of B 8‑MR / B 12‑MR were calculated. The B 8‑MR / B 12‑MR ratios are also listed in Table .…”

Section: Resultsmentioning

confidence: 99%

Wheel-like Mordenite Nanoassemblies with Shortened Channel Lengths for Improved Catalytic Performance in Dimethyl Ether Carbonylation

Liu,

Wang,

et al. 2023

ACS Appl. Nano Mater.

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To achieve a better catalytic performance, it is of great interest to synthesize nanosized zeolites with reduced internal diffusion limitations. Herein, c-axis shortened wheel-like mordenite nanoassemblies were synthesized. The crystal growth along the [001] direction was successfully inhibited with K + cations as structure breaking agents. The wheel-like crystal is 1.5−2 μm in diameter and 200−300 nm in thickness. The growth of such a unique structure underwent a nonclassical crystallization process including the generation of amorphous worm-like particles and formation of wheel-like crystallites followed by a−b plane oriented growth of the crystals. The obtained MOR wheel-like assemblies possessed larger surface area and external surface area, displayed better mass transfer properties, and exhibited much better catalytic performance than MOR spheroid-like assemblies and conventional bulk MOR zeolite in dimethyl ether (DME) carbonylation reaction, with two and a half times higher the conversion of DME than the bulk MOR, although these samples had identical Si/Al ratios and acid properties. This work provides a simple route to control the zeolite morphology by alkali metal cations and brings forward an effective strategy to prepare zeolite materials with improved catalytic performance.

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Section: Resultsmentioning

confidence: 99%

Wheel-like Mordenite Nanoassemblies with Shortened Channel Lengths for Improved Catalytic Performance in Dimethyl Ether Carbonylation

Liu,

Wang,

et al. 2023

ACS Appl. Nano Mater.

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“…Compared with a traditional organometallic homogeneous catalyst system, zeolite catalysts have enormous advantages in the nonuse of corrosive halide promoters, the realization of continuous plug-flow processing and easy product separation [ 14 , 15 , 16 ]. MOR zeolite has been widely reported to be the most active and selective catalyst for carbonylation of DME, while its 12-membered ring (12 MR) channel would be easily blocked by coke, which would lead to a dramatic decrease in activity with a prolonged reaction time [ 6 , 17 , 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

Activity Enhancement of Ferrierite in Dimethyl Ether Carbonylation Reactions through Recrystallization with Sodium Oleate

Chen

et al. 2023

Molecules

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Methyl acetate (MA) has a wide range of applications as an important industrial chemical. Traditional MOR zeolite for carbonylation of DME to MA accumulated carbon easily because of a 12-membered ring (12 MR) channel. In this work, we innovatively developed the method of recrystallization ferrierite (FER) zeolite using special chelating ligand sodium oleate which can affect ions other than alkali metals. The characterization results of N2 adsorption, transmission electron microscopy (TEM), and Fourier transform infrared spectroscopy (FT-IR) show that hydrothermal recrystallization of ferrierite using sodium oleate resulted in a higher Si/Al ratio, a bigger specific surface area and a larger number of Brønsted acid sites in the eight MR channels, which was more efficient in the reaction of carbonylation of dimethyl ether than ordinary alkali treatment.

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Insights Into the one‐Step Dimethyl Ether Carbonylation to Ethanol Over Cu/ZnO@Cu‐MOR Core‐Shell Catalysts with Porogen Engagement

Lu,

Nyako,

Lin

et al. 2024

ChemistrySelect

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This study investigates the one‐step ethanol synthesis from dimethyl ether and syngas using the catalysts combining Cu/ZnO oxides and modified Cu‐MOR zeolite. In addition to physically mixed two‐component catalysts, multifunctional catalysts featuring a Cu/ZnO core and modified zeolite (Cu‐MOR and HMOR) shell are also presented. Further, the porogenic agent of dihexadecyldimethylammonium bromide (DHAB) was involved in the synthesis process of the MOR zeolite components of Cu/ZnO@Cu‐MOR and Cu/ZnO/Cu‐MOR catalysts, but not in that of Cu/ZnO@Cu‐MOR° catalyst. A series of characterization measures including XRD, TGA, BET, SEM, TEM and EDS have been systematically studied on the prepared catalysts. Characterizations of the catalyst surface structure and texturing parameters revealed a disturbance in crystallinity upon Cu insertion, facilitating syngas separation and promoting DME carbonylation while preventing undesired CO hydrogenation. The addition of DHAB as a porogen in the synthesis of zeolite shell improved specific surface area and porosity of zeolite shell, and reduced coke deposition, without leaching active metal components, resulting in enhanced reaction properties. Cu/ZnO@Cu‐MOR core‐shell catalyst showed good performance with 28.9 % DME conversion and 43.8 % selectivity for ethanol. The optimized pore structure and enhanced catalytic performance of the modification process validate the effectiveness and efficiency of this strategy.

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Mg enhances the catalytic selectivity and stability of mordenite for carbonylation of dimethyl ether

Cited by 6 publications

References 47 publications

Wheel-like Mordenite Nanoassemblies with Shortened Channel Lengths for Improved Catalytic Performance in Dimethyl Ether Carbonylation

Wheel-like Mordenite Nanoassemblies with Shortened Channel Lengths for Improved Catalytic Performance in Dimethyl Ether Carbonylation

Activity Enhancement of Ferrierite in Dimethyl Ether Carbonylation Reactions through Recrystallization with Sodium Oleate

Insights Into the one‐Step Dimethyl Ether Carbonylation to Ethanol Over Cu/ZnO@Cu‐MOR Core‐Shell Catalysts with Porogen Engagement

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