Abstract: A series of monometallic and metal-acid dual-functional catalysts were prepared by impregnation method, and the effects of different metals, acid materials, metal loading, number of acid centers, and the distance between metal and acid center on the reaction of benzene and syngas were investigated. Stability of the catalyst was also evaluated. As a result, Zn is the most active metal component; the dual-function catalyst composed of Zn and HZSM-5 has higher activity than the single-function catalyst; the proper ratio of metal to acid center is beneficial to the better dispersion of active components on the carrier and promote the reaction; the catalyst prepared by the impregnation method has a closer distance between the metal and the acid center, and has the highest reaction activity. At the same time, the possible reaction path of the benzene and syngas alkylation reaction is verified. The 300 h stability experiment result show that the average conversion rate of benzene is 36%, the selectivity of toluene and xylene is greater than 90%, and the catalyst has good reactivity and stability.

Key words: benzene, syngas, alkylation reaction, catalyst