Solvent-Free Vicinal Diol Olefination With Supported Composite Catalysts
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Solution Overview
Problem
Existing methods for producing allyl alcohol and dihydrofuran from biomass-derived raw materials suffer from low selectivity and yield, and the use of chemical solvents complicates the process and increases environmental impact.
Innovation Solution
A catalyst system using oxides of group-6 and group-7 elements supported on a carrier, combined with metals like silver, iridium, or gold, is used to react vicinal diols with hydrogen under solvent-free conditions, forming olefins with high selectivity and yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional catalysts and solvents are used in the olefination reaction of vicinal diols, then the reaction can proceed, but the selectivity and yield of olefin products are low
Solution Approach 1:
The patent changes the chemical parameters of the catalyst system by using specific oxide combinations (group-6 and group-7 element oxides) supported on carriers, and optimizes reaction conditions (temperature, pressure, H2/diol ratio) to achieve high selectivity (70-95%) and yield (60-90%) of olefin products from vicinal diols
Solution Approach 2:
The patent employs composite catalyst materials consisting of multiple oxide components (e.g., MoO3-WO3, Re2O7-MoO3) supported on carrier materials like alumina or silica, creating a synergistic catalytic system that enhances both selectivity and productivity for olefin production
2Ease of operation
If chemical solvents are used in the olefination reaction, then the reaction can proceed smoothly, but the process complexity and environmental impact increase
Solution Approach 1:
The patent extracts and eliminates the solvent component from the reaction system, achieving solvent-free olefination conditions. This removes the need for solvent recovery equipment and simplifies the overall process while maintaining reaction efficiency through optimized catalyst and reaction condition design
Solution Approach 2:
The reaction system is designed to be self-sufficient without external solvents, using the reactants themselves and optimized reaction conditions (temperature, pressure, catalyst) to enable smooth reaction progression. The catalyst system provides the necessary medium for reactant interaction without requiring additional solvent materials
3Adaptability or versatility
If multiple product components are obtained from biomass-derived raw materials, then various chemicals can be produced, but the selectivity for target olefin products decreases
Solution Approach 1:
The patent applies local quality by designing a catalyst with specific active sites and properties tailored for the olefination reaction. The oxide combination and carrier material are selected to create localized catalytic environments that favor olefin formation through specific reaction mechanisms, achieving high selectivity (70-95%) for target olefin products while minimizing side reactions
Solution Approach 2:
Instead of using broad-spectrum catalysts that produce multiple products, the patent inverts the approach by designing highly selective catalysts that specifically promote olefin formation. This targeted approach reverses the conventional strategy of accepting multiple products and instead focuses on maximizing single product selectivity through careful catalyst design
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
This method produces olefins with high selectivity and yield, reduces solvent-related costs, and minimizes environmental impact by utilizing biomass-derived raw materials, contributing to a sustainable society.
Implementation Method 1
the reaction of the compound including two adjacent carbon atoms each containing a hydroxy group with the hydrogen proceeds in the presence of a catalyst
Data Source
AI summary
Provided is a method capable of producing an olefin with high selectivity and high yield using a vicinal diol as a raw material. A method for producing an olefin includes a step of reacting a compound including two adjacent carbon atoms each containing a hydroxy group with hydrogen and forming an olefin, and in this step, the reaction of the compound including two adjacent carbon atoms each containing a hydroxy group with the hydrogen proceeds in the presence of a catalyst under a condition substantially free of a solvent. The catalyst includes a carrier, at least one oxide supported on the carrier and selected from the group consisting of oxides of group-6 elements and oxides of group-7 elements, and at least one metal supported on the carrier and selected from the group consisting of silver, iridium, and gold.