Abstract
Light olefins are key components of modern chemical industry and are feedstocks for the production of many commodity chemicals widely used in our daily life. It would be of great economic significance to convert light alkanes, produced during the refining of crude oil or extracted during the processing of natural gas selectively to value-added products, such as light alkenes, aromatic hydrocarbons, etc., through catalytic dehydrogenation. Among various catalysts developed, Ga-modified ZSM-5-based catalysts exhibit superior catalytic performance and stability in dehydrogenation of light alkanes. In this mini review, we summarize the progress on synthesis and application of Ga-modified ZSM-5 as catalysts in dehydrogenation of light alkanes to olefins, and the dehydroaromatization to aromatics in the past two decades, as well as the discussions on in-situ formation and evolution of reactive Ga species as catalytic centers and the reaction mechanisms.
Highlights
Zeolites are a kind of aluminosilicate crystals with well-defined microporous systems, and are widely applied in catalysis, selective adsorption, ion exchange, etc
We focused on the recent progress on the synthesis and application of Ga-modified ZSM-5 as catalysts for dehydrogenation and dehydroaromatization of alkanes, as well as the discussions on in-situ formation and evolution of reactive Ga species as catalytic centers and the reaction mechanisms
Contrary to Ga-modified ZSM-5, synthesized by ion exchange and incipient wetness impregnation, which require pre-treatment to achieve a reasonable dispersion of Ga species, extra-framework Ga species are well-dispersed in the samples synthesized by chemical vapor deposition (CVD) [75,81]
Summary
Zeolites are a kind of aluminosilicate crystals with well-defined microporous systems, and are widely applied in catalysis, selective adsorption, ion exchange, etc. Pt is capable of catalyzing scission of C-C bonds, leading to limited product selectivity to olefins [16,17,27] These catalysts suffer from carbon deposition and sintering of metal species in reaction conditions [28]. CrOx was proposed effective for dehydrogenation in 1930s and is used in industry for butane dehydrogenation Both carbon deposition in reaction conditions and diffusion of Cr species into the bulk support are the major sources of deactivation of. We focused on the recent progress on the synthesis and application of Ga-modified ZSM-5 as catalysts for dehydrogenation and dehydroaromatization of alkanes, as well as the discussions on in-situ formation and evolution of reactive Ga species as catalytic centers and the reaction mechanisms
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