Research progress on metal-acid balance of alkane hydroisomerization catalysts
The hydroisomerization of alkanes plays an increasingly important role in the chemical industry.However,due to the complex synergistic effect between the metal and acid sites on bifunctional catalysts,preparing catalysts with excellent hydroisomerization performance remains a challenge.To further improve the performance of the catalyst,it is necessary to optimize the equilibrium relationship between metal sites and acid sites,and a good metal acid equilibrium state helps to improve the selectivity of isomeric products in the catalyst.This review first introduces the bifunctional mechanism in the hydroisomer-ization of alkanes,and then summarizes the relevant research results of metal-acid balance between metal sites and acid sites in this catalytic system in recent years from two aspects:concentration balance and distance balance.Finally,some modification methods for optimizing the metal-acid balance of catalysts are exampled.