Alkylation of Benzene and Methanol over MCM-56 Molecular Sieve Catalyst Modified by Phosphomolybdic Heteropoly
1.Chemical Engineering Institute, East China University of Science and Technology, Shanghai 200237, China; 2.Research Institute of Urumuqi Petrochemical Company, Urumuqi 830019, China
Abstract：The MCM-56 molecular sieve catalyst modified by phosphomolybdic heteropoly(H3PMo12O40) was prepared by the impregnation method and was characterized by chemisorption of NH3 and X-ray diffusion (XRD). The catalyst was evaluated using alkylation reaction of benzene and methanol in a micro-reactor. The results showed that the PMo2 loading had certain influence on the total amount of acid and acid distribution on the modified MCM-56 catalyst. As the PMo12 loading increased, the total amount of acid increased, while the acidity of the catalyst decreased. The appropriate catalyst was MO3/MCM-56 (H3PMo12O40) molecular sieve with 5% PMO12 loading, and over it, the benzene conversion was above 50% and selectivity of toluene and xylene reached more than 90% under the conditions of temperature of 460-475 ℃ and space velocity of 3.33 h-1, which indicated that the modified catalyst had excellent activity.
Xu Yarong1,2,Zhu Xuedong1 et al. Alkylation of Benzene and Methanol over MCM-56 Molecular Sieve Catalyst Modified by Phosphomolybdic Heteropoly[J]. 化学反应工程与工艺, 2013, 29(6): 572-575.
