Mesoporous Silica Supported Re Oxide Catalyst for Low-Temperature Olefin Metathesis
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Solution Overview
Problem
Current olefin metathesis catalysts face challenges with low chemical stability, difficulty in separation and recovery, and require high temperatures, limiting their use in commercial processes.
Innovation Solution
A catalyst is developed by supporting rhenium oxide or molybdenum oxide on mesoporous silica or alumina surfaces modified with C1-C5 alkoxy groups, enhancing thermal and chemical stability, allowing for efficient metathesis of long-chain unsaturated hydrocarbons at lower temperatures and facilitating easy separation and regeneration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If metal carbene-based liquid catalysts are used, then catalytic activity is excellent, but chemical stability is weak and separation is difficult
Solution Approach 1:
The patent uses mesoporous silica or alumina as a support material with controlled pore structures to immobilize metal carbene complexes. The porous structure provides high surface area for catalyst support while maintaining accessibility of reactants, resolving the contradiction between liquid catalyst activity and stability through heterogeneous catalysis.
Solution Approach 2:
The patent creates composite catalyst systems by combining metal carbene complexes with solid support materials (silica or alumina). This composite approach integrates the high activity of metal carbene catalysts with the stability and ease of separation of solid supports, achieving both excellent catalytic performance and chemical stability.
2Reliability
If metal oxide-based solid catalysts are used, then thermal and chemical stability is high, but catalytic activity is low and high temperature (200-500°C) is required
Solution Approach 1:
The patent develops composite catalysts by supporting metal oxides (Re, Mo, W) on modified mesoporous silica or alumina surfaces. The modification of support surfaces with specific functional groups enhances the interaction between metal oxide species and the support, creating active sites that function at lower temperatures while maintaining the thermal and chemical stability of the solid catalyst structure.
Solution Approach 2:
The patent modifies the physical and chemical parameters of the catalyst system by controlling the pore size, surface area, and surface chemistry of the mesoporous support. These parameter changes enable the catalyst to achieve high activity at lower temperatures (150°C or lower) while preserving the stability advantages of solid metal oxide catalysts.
3Ease of operation
If conventional solid catalysts are used, then separation is easy, but catalytic activity is insufficient for commercial processes
Solution Approach 1:
The patent employs mesoporous materials with optimized pore structures that facilitate both catalytic activity and ease of separation. The porous structure allows small reactant molecules to access active sites while enabling simple filtration or centrifugation for catalyst recovery, meeting commercial process requirements for both high activity and operational ease.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The catalyst achieves high efficiency in metathesis reactions at 150°C or lower, can be readily recovered and reused multiple times, and is suitable for commercial olefin metathesis processes.
Implementation Method 1
rhenium (Re) oxide or molybdenum (Mo) oxide is supported on a mesoporous silica surface-modified by a compound in which one or more C1-C5 alkoxy groups are linked to one or more metals selected from the group consisting of Al, Nb, Fe, Co, Zn, Ga and Sn
Data Source
AI summary
The present invention relates to an olefin metathesis reaction catalyst where rhenium (Re) oxide or molybdenum (Mo) oxide is supported, as a catalyst main component, on a surface-modified mesoporous silica or mesoporous alumina support, and a preparation method therefor. The olefin metathesis reaction catalyst of the present invention allows highly efficient metathesis of long-chain unsaturated hydrocarbons having at least eight carbons at a low temperature of 150° C. or lower. The catalyst can be separated readily from reaction solution, regenerated at a low temperature of 400° C. or lower by removing toxins accumulated on it during the metathesis reaction, and used repeatedly in metathesis reaction many times, thereby being made good use in commercial olefin metathesis processes.