The interaction of molybdenum and titanium in mesoporous materials for olefin epoxidation

Reaction Kinetics, Mechanisms and Catalysis - Tập 135 - Trang 317-331 - 2022
Jian Zhang1, Huien Zhang1, Liping Liu1, Zhongfa Chen1
1Zhejiang Provincial Top Discipline of Biological Engineering (Level A), College of Biological and Environmental Sciences, Zhejiang Wanli University, Ningbo, China

Tóm tắt

A series of bimetallic Mo–Ti–SBA-15-(X), and monometallic Mo/Ti–SBA-15-(X) mesoporous materials were synthesized by direct one-step hydrothermal method. The materials were characterized by XRD, N2 adsorption/desorption, XPS, SEM, EDX, TEM and ICP-AES. XRD results clearly demonstrated that the incorporation of molybdenum and titanium species in the SBA-15 framework little affect the mesoscopic nature of the material. The oxidation state and coordination environment of the active sites was confirmed by XPS. The results revealed that Mo6+ was in octahedral geometry whereas Mo6+ and Ti4+ were in tetrahedral coordination in the SBA-15 framework. The O1s XPS spectrum well established the framework incorporation of molybdenum and titanium species. The catalytic activity of Mo–Ti–SBA-15-(6.5) material was evaluated in the epoxidation of cyclohexene with TBHP. It was found that Mo–Ti–SBA-15-(6.5) catalyst showed high catalytic activity gave a 98% conversion and > 98% selectivity within 8 h. The Mo–Ti–SBA-15-(6.5) was a promising catalyst for the epoxidation of cyclohexene and other olefins. The results showed that the materials containing Ti and Mo exhibited higher catalytic activity than monometallic modified SBA-15.

Tài liệu tham khảo

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