Pore Size Effects over Hierarchical Pore Hβ via Two‐Stage Crystallization in Benzene Hydroalkylation

Abstract Hierarchical pore Hβ molecular sieve with high crystallinity were synthesized by two‐step hydrothermal crystallization and seed‐assisted, indicating that the method was more favorable to synthesize the hierarchical pore structure, and seed‐assisted was helpful to improve the relative crystallinity and acid properties of Hβ. Compared with microporous Hβ, the hierarchical pore Hβ synthesized by a two‐step hydrothermal crystallization strategy were presented high performance of benzene hydroalkylation. The conversion of benzene was 54.69 %, selectivity for cyclohexylbenzene was 74.31 %, and the catalyst activities was relatively stable within 280 h under hydrogen pressure of 2 MPa, temperature of 473 K, liquid space speed of 1 h −1 , and H 2 /benzene molar ratio of 0.8 over Hβ loading 0.2 % (wt.%) Ru. Furthermore, the mesoporous structure of sample was beneficial to improve the diffusion rate of reactants and products and exposed more acidic active centers, which was conducive to the efficient hydroalkylation.