Advances in Molecular Sieve-based Catalysts for Catalytic Reforming of Chain Alkanes
Alkanes are an important component of naphtha,but their application value and economic benefits are relatively low,especially for medium to long-chain alkanes that require further processing to enhance their practical value.Owing to the complicated structure of alkanes,to fully utilize the resources of alkanes and enhance their value,researchers have improved the quality of alkanes through catalytic reforming technology.Under the catalysis,medium to long-chain alkanes with a higher carbon number are transformed into short-chain hydrocarbons,isomers,and aromatics,which present an effective way to enhance the quality and economic value of alkanes.The ctalytic reforming technology primarily contains such as aromatization,isomerization,and catalytic cracking,and the catalyst is the core of the reforming process,including Pt/Cl-/Al2O3 single/bifunctional catalysts,metal oxide catalysts,and modified molecular sieve catalysts.Molecular sieve-based catalysts have garnered significant attention due to their unique pore structures and the versatility of active metals.In recent years,researchers mainly have improved the performance of catalysts by regulating the types of active metals,adjusting electronic properties,and optimizing pore structures.However,the impact of microenvironment changes in the molecular sieve skeleton on the catalytic active center has not been fully studied and remains a key point of future research work.In addition,exploring the mechanism of alkanes reforming catalytic reactions has always been a core frontier topic in catalytic research and a direction for future research.This review provides an overview of the main reaction mechanisms of chain alkanes in catalytic reforming,outlines the recent research advances,and discusses the performance optimization of molecular sieve-based catalysts.
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