一种高比表面积合成丙烯腈的催化剂及其制备方法
By combining organic-inorganic hybrid design and multi-step surface modification with modified rare earth metal oxides and organosilane coupling agents, a catalyst with a multi-level porous structure was prepared, which solved the problems of easy catalyst agglomeration and uneven pore distribution, and achieved high specific surface area and high acrylonitrile yield.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- JI HUA JI TUAN JI LIN SHI XING GONG MAO YOU XIAN GONG SI
- Filing Date
- 2025-11-05
- Publication Date
- 2026-07-17
AI Technical Summary
Existing catalysts for propylene ammoxidation are prone to agglomeration during drying or calcination, resulting in a decrease in specific surface area and limited improvement in acrylonitrile yield. Furthermore, conventional silica sol tends to form a dense network after calcination, hindering the uniform dispersion of active ingredients and reducing catalytic performance.
An organic-inorganic hybrid design and multi-step surface modification method were adopted. By pretreatment with β-cyclodextrin and the use of modified rare earth metal oxides, a mesoporous-microporous composite structure was formed. Combined with organosilane coupling agent modification and sol-gel method to prepare a silica support with a multi-level porous structure, the catalyst's wear resistance and mass transfer efficiency were improved.
It significantly improved the pore structure and wear resistance of the catalyst, enhanced the mass transfer efficiency of the reactants, and achieved an acrylonitrile yield of over 85%. It also solved the problems of catalyst agglomeration and uneven pore distribution, thereby improving catalytic efficiency.
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