Article
Chemistry, Applied
Ana Palcic, Sara Navarro Jaen, Dan Wu, Mengdie Cai, Chong Liu, Evgeny A. Pidko, Andrei Y. Khodakov, Vitaly Ordomsky, Valentin Valtchev
Summary: The study demonstrates that using embryonic zeolite units as catalysts shows superior activity, selectivity, and stability, promoting efficient synthesis of dimethyl ether.
MICROPOROUS AND MESOPOROUS MATERIALS
(2021)
Article
Chemistry, Physical
Mauro Mureddu, Sarah Lai, Luciano Atzori, Elisabetta Rombi, Francesca Ferrara, Alberto Pettinau, Maria Giorgia Cutrufello
Summary: CO2-derived methanol and dimethyl ether can serve as important fuels, energy carriers, and bulk chemicals. Converting CO2 into methanol is seen as a promising approach to mitigate global warming.
Article
Engineering, Chemical
Inigo Perez-Miqueo, Oihane Sanz, Mario Montes
Summary: Different structured catalytic reactors for direct DME synthesis were compared based on catalyst hold-up, thermal conductivity, and volumetric productivity. Coating method shows advantages over packed-bed monolith in terms of catalyst inventory per reactor volume, but completely filling a monolith with powder catalyst leads to a significant decrease in CO conversion. The nature and shape of the substrate have minimal impact on the CO conversion values and selectivity to different compounds.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Chemistry, Physical
Hela Lassoued, Noelia Mota, Elena Millan Ordonez, Sahar Raissi, Mohamed Kadri Younes, Carlos Quilis Romero, Rufino M. Navarro Yerga
Summary: This study investigates the effect of synthesis conditions on the catalytic behavior of bifunctional composite catalysts and optimizes the catalyst for the direct production of DME from syngas. The mesoporous aerogel catalyst with higher acidity exhibits significantly higher DME production compared to the xerogel catalyst.
Article
Energy & Fuels
Jie Tuo, Jilong Wang, Xianchen Gong, Chengwei Zhai, Hao Xu, Teng Xue, Jingang Jiang, Yejun Guan, Peng Wu
Summary: Enriching aluminum atoms in T2 and T4 sites of FER zeolite is crucial for achieving high catalytic activity in the carbonylation reaction of dimethyl ether. This study successfully synthesized FER nanosheets with preferential aluminum distribution, and found that the assistance of CTAB played a key role in regulating the morphology and aluminum distribution.
Article
Energy & Fuels
Wonho Jung, Seulah Lee, Hyeona Kim, Woo-Jae Kim, Jinwon Lee
Summary: We proposed an integrated process to produce methyl acetate (MA) from shale gas-derived dimethyl ether (DME), with high selectivity and conversion rate achieved using specific catalysts. The mathematically modeled technoeconomic analysis demonstrated low production costs and high net present values, supporting the feasibility of industrially producing MA from syngas-derived DME intermediates.
Article
Energy & Fuels
Fatima Magzoub, Shane Lawson, Fateme Rezaei, Ali A. Rownaghi
Summary: Additive manufacturing, also known as 3D printing, was used to produce customizable heterogeneous catalysts for the conversion of methanol into dimethyl ether. Among the catalysts tested, the one containing 4 wt % Ga2O3 alongside ZSM-5 showed the best performance at 200 degrees C, achieving 85% methanol conversion and 74% DME selectivity.
Article
Chemistry, Applied
J. C. Bedoya, R. Valdez, L. Cota, M. A. Alvarez-Amparan, A. Olivas
Summary: In this study, mesoporous Al-MCM-41 nanospheres with variable sizes were successfully synthesized and characterized, showing hexagonal and mesoporous structure with the successful incorporation of Al ions. The smaller nanospheres exhibited more medium acidic sites on the surface. All samples displayed good selectivity towards DME, with the smallest nanospheres achieving 78% DME yield at 300 degrees C. The stability test revealed high DME yield (>60%) maintained during a 48-hour time-on-stream, indicating the potential for material recycling.
Review
Chemistry, Applied
A. Ateka, P. Rodriguez-Vega, J. Erena, A. T. Aguayo, J. Bilbao
Summary: The direct synthesis of dimethyl ether (DME) on bifunctional catalysts is attractive for valorizing CO2 and syngas from biomass gasification. Performing methanol synthesis and its dehydration in the same reactor favors the formation of DME from CO2 and CO2 co-fed with syngas. Catalyst performance has been improved by modifying the composition and properties to enhance activity, selectivity, and minimize deactivation. The core-shell configuration of the bifunctional catalyst improves stability by separating the environments of methanol synthesis and its conversion into DME.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Energy & Fuels
L. N. Vosmerikova, Z. M. Matieva, Yu M. Snatenkova, N. Kolesnichenko, V. Zaikovskii, A. V. Vosmerikov
Summary: Zinc-isomorphously substituted HZSM-5 catalyst (Zn/HZSM-5(iso)) exhibits high selectivity and efficiency in the conversion of a mixture of DME + syngas.
Article
Energy & Fuels
Merve Celik Ozcan, Birce Pekmezci Karaman, Nuray Oktar, Timur Dogu
Summary: The direct synthesis of dimethyl ether (DME) from syngas was studied using a bifunctional catalyst containing STA@SBA-15. The results showed that incorporating STA into SBA-15 significantly improved the selectivity and conversion of DME. Furthermore, the removal of CO2 from the reaction medium further enhanced the selectivity of DME.
Article
Chemistry, Applied
Xiaobo Feng, Jie Yao, Yan Zeng, Yu Cui, Shun Kazumi, Reubroycharoen Prasert, Guangbo Liu, Jinhu Wu, Guohui Yang, Noritatsu Tsubaki
Summary: Converting syngas into ethanol remains a challenge, but a new route has been opened by converting dimethyl ether to methyl acetate on zeolite and further hydrogenating to ethanol on a Cu-based catalyst. By utilizing a nano-sized ZSM-35 zeolite and an auto-reduced CuZnAl catalyst, ethanol synthesis has been achieved with stable DME conversion and MA selectivity under optimized conditions.
Article
Chemistry, Multidisciplinary
Itzhak I. Maor, Svetlana Heyte, Oren Elishav, Meirav Mann-Lahav, Joelle Thuriot-Roukos, Sebastien Paul, Gideon S. Grader
Summary: A new architecture of Cu- and Cu/Zn-based catalysts supported on electrospun alumina nanofibers was synthesized for the synthesis of methanol and DME from CO2 and green hydrogen. The hierarchical fibrous structure of the catalyst played a crucial role in the reaction activity and selectivity. The Cu or Cu/ZnO formed a unique nanosheet structure, providing a large surface area for the reaction. The catalysts containing 7% wt. Cu/Zn with a weight ratio of 2.3 Zn to Cu achieved maximal production of methanol and DME.
Article
Engineering, Chemical
Kainakhone Pathoumthong, Putong Ratanamalaya, Sunun Limtrakul, Terdthai Vatanatham, Palghat A. Ramachandran
Summary: A two-phase model was developed to scale up bubbling fluidized bed reactors for dimethyl ether production. Correlations for the kinetic model and mass transfer coefficient were developed from experimental data. Scaling up from laboratory to industrial scale was carried out using three similarity criteria. The hydrodynamic criterion was found to be inadequate, while the criteria for performance and residence time yielded the same dimethyl ether yield in all scales. The two-phase models, combined with correlations for kinetic and mass transfer parameters, are useful for analyzing and scaling up laboratory and industrial-scale reactors.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Sara Navarro-Jaen, Mirella Virginie, Joelle Thuriot-Roukos, Robert Wojcieszak, Andrei Y. Khodakov
Summary: This study found that copper dispersion was higher and CO2 conversion rate was greater on alumina and zirconia supported catalysts, followed by ceria supported catalysts. The CO2 hydrogenation process appears to be mainly influenced by the higher copper dispersion and to a lesser extent by the concentration of Bronsted acid sites in the catalysts studied. Due to lower reverse water gas-shift activity, the alumina supported catalyst showed a higher dimethyl ether yield compared to the zirconia and ceria supported catalysts.
JOURNAL OF MATERIALS SCIENCE
(2022)
