Abstract
A series of hierarchical H-MOR zeolites with different pore structure were designed and synthesized by alkaline and alkaline-acid post-synthesis methods. The catalytic performance of hierarchical H-MOR zeolite-supported vanadium oxide was investigated for dimethyl ether (DME) direct oxidation. Different pore structures apparently affect the distribution of oxidation product distribution, especially the selectivity of DMMx and CO. The formation of mesopores for 10%V2O5/deAlmm-H-MOR markedly improved the DMMx selectivity up to 78.2% from 60.0%, and more notably, CO selectivity dropped to zero compared to that of 10%V2O5/H-MOR. The hierarchical H-MOR zeolites were confirmed to be successfully prepared by the post-synthesis method. Due to the presence of mesoporous structure, the dispersion of vanadium oxide species was enhanced, which could improve the reducibility of vanadium oxide species and also make better contact with the acid sites of zeolite to exert the synergistic effect of the bifunctional active sites. More importantly, the creation of mesopores was proved to be favorable to the mass transfer of intermediate and products to avoid the occurrence of secondary reaction, which could effectively suppress the formation of by-products. This work is helpful for us to provide a novel insight to design the catalyst with suitable pore structure to effectively synthesize diesel fuel additives from DME direct oxidation.
Highlights
IntroductionDimethyl ether (DME) is a clean fuel and a potential non-petroleum route chemical material
Dimethyl ether (DME) is a clean fuel and a potential non-petroleum route chemical material.it can be widely synthesized by one-step method from syngas generated from coal, renewable biomass, and natural gas [1,2]
X-ray diffraction (XRD) Characterization acid-leached treatment decreases the crystallinity of supported catalysts, itit suggests acid-leached treatment decreases the crystallinity crystallinity of supported supported catalysts, and it itand suggests well-aa wellacid-leached treatment decreases the of catalysts, and suggests aaa wellacid-leached treatment decreases the crystallinity of supported catalysts, and suggests wellacid-leached treatment the crystallinity of supported catalysts, it acid-leached treatment decreases the crystallinity supported ititand suggests preserved structure after the treatments
Summary
Dimethyl ether (DME) is a clean fuel and a potential non-petroleum route chemical material. In comparison, oxidizing DME directly to synthesize DMMx is considered as a very competitive and environmentally friendly route for the synthesis of clean fuel additives due to the advantages of short process, low investment, low CO2 emissions, and high energy efficiency. In comparison, oxidizing DME directly to synthesize DMMx is considered as a very competitive and environmentally friendly route for the synthesis of clean fuel additives due to the advantages. Reaction fabricating the mesopores structure in the zeolite crystals an efficientstructure method to the zeolite crystals is an efficient method to solve the mass transfer limitation of zeolite micropores to solve the mass transfer limitation of zeolite micropores to improve the catalytic performance [16,17].
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