Mechanistic kinetic modeling for catalytic conversion of DME to gasoline-range hydrocarbons over nanostructured ZSM-5

Abstract

A new kinetic model for the synthesis of gasoline-range hydrocarbons from dimethyl ether over a nanostructured ZSM-5 catalyst was developed based on the dual-cycle reaction mechanism. The production of individual...

Effects of ZSM-5 Morphology and Fe Promoter for Dimethyl Ether Conversion to Gasoline-Range Hydrocarbons

“…The results were attributed to the presence of an optimal amount of strong Brønsted acid sites, as well as well-dispersed Fe 2 O 3 nanoparticles with an average Fe 2 O 3 size of 11.1 nm by weakening the cracking reaction activity of N-ZSM-5, where the optimal Fe 2 O 3 crystallite size of ~10 nm seems to properly adjust the surface acidic sites without significant blockages of the active sites [64,65]. The more detailed reaction mechanisms for DME conversion to gasoline-range hydrocarbons by stepwise surface methoxy formation, alkylation, hydrogen transfer, and aromatization [14] were modified and are displayed in Supplementary Figure S5. As a brief summary, nanostructured N-ZSM-5 possessing abundant strong Brønsted acid sites can be one of the promising catalyst candidates for a gas-phase methanol/DTG reaction with higher gasoline-range hydrocarbon selectivity, which can be further optimized with a proper amount of Fe 2 O 3 nanoparticles (10 wt% Fe on N-ZSM-5) by modifying the surface acidic sites with the suppressed cracking reaction activity of the surface intermediates as well.…”

“…In addition, the recent techno-economic analysis of the DME-to-gasoline (DTG) process has suggested its higher economic feasibility by utilizing biomass or coal-derived syngas [11,12]. It has been reported that zeolites having unique shape selectivity and surface acidity play important roles in DME conversion to gasoline-range hydrocarbons by multiple reaction steps such as surface methyl formation, olefin methylation, olefin cracking, hydrogen transfer, cyclization, aromatics methylation, aromatics dealkylation, and so on [13,14]. In particular, ZSM-5 with MFI topology was found to be crucial for the selective production of gasoline-range hydrocarbons due to its unique channel structures with medium pore size openings, which are important for the selective penetrations of intermediates in the pores, resulting in the shape-selective formation of gasoline-range hydrocarbons [15].…”

COxFixation to Elementary Building Blocks: Anaerobic Syngas Fermentation vs. Chemical Catalysis

“…It is also a promising fuel for the transportation section due to its considerable energy density, its high cetane number (CN) and the absence of C‐C bonds, resulting in lower emissions of particulate matter (PM), soot, hydrocarbons and CO, when comparing to diesel 53, 54. DME is also a feedstock for different processes such as DME‐to‐Gasoline, DTG 55, 56, aromatic free olefins (C 4 to C 7 range) 57 and oxymethylene ethers (OMEs) 58.…”