Intermetallic Catalyst Selectivity for Hydrofluoroolefin Production
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Solution Overview
Problem
The existing methods for producing hydrofluoroolefins from chlorofluoroolefins suffer from insufficient reduction of by-products and require more selective metal catalysts to improve productivity while maintaining the carbon-carbon double bond.
Innovation Solution
A method involving the reaction of chlorofluoroolefins with hydrogen in the presence of an intermetallic compound containing specific metals like palladium, platinum, rhodium, copper, or iridium, supported on a carrier, to enhance the selectivity and residual ratio of the carbon-carbon double bond substitution reaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a catalyst made of an alloy including at least one platinum group element and at least one second element is used, then the residual ratio of carbon-carbon double bond and selectivity of substitution reaction are improved, but the reduction of by-products is not sufficient
Solution Approach 1:
The invention changes the chemical composition parameters of the catalyst by specifying that it must contain at least one platinum group element (Pd, Pt, Rh, Ir) and at least one second element (Mn, Cu, Al, Au, Li, Na, K, Mg, Ag, Zn, Cd, In, Si, Ge, Sn, Pb, As, Sb, or Bi), with the platinum group element content being 0.1-10 wt% and the second element content being 0.1-10 wt%. This parameter optimization resolves the contradiction by achieving both high selectivity and low by-product formation.
Solution Approach 2:
The invention uses a composite catalyst material combining platinum group elements with second elements, where the synergistic effect between these metal components achieves both high substitution reaction selectivity and effective by-product reduction. The composite structure allows the catalyst to simultaneously maintain carbon-carbon double bonds while promoting selective hydrogenation of chlorine atoms.
2Stability of the object's composition
If a catalyst made of an alloy including at least one platinum group element and at least one second element is used, then the residual ratio of carbon-carbon double bond is improved, but productivity is not sufficiently improved
Solution Approach 1:
The invention optimizes catalyst parameters by controlling the content of platinum group elements (0.1-10 wt%) and second elements (0.1-10 wt%), and by selecting appropriate metal combinations that provide both high double bond preservation and high reaction activity. This parameter optimization resolves the contradiction between stability and productivity.
Solution Approach 2:
The invention applies local quality by creating a catalyst with specific metal distribution and interaction zones, where platinum group elements provide selectivity for maintaining carbon-carbon double bonds while second elements enhance overall reaction productivity. The localized synergistic effects resolve the contradiction between preserving molecular structure and improving production efficiency.
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 effectively improves the selectivity and productivity of hydrofluoroolefin production by using intermetallic compounds like Pd3Bi, Pd3In, or Pd3Sn supported on carriers, reducing by-products and maintaining the carbon-carbon double bond integrity.
Implementation Method 1
reacting a chlorofluoroolefin that is represented by following Formula (I) or following Formula (II) and that has 8 or less carbon atoms with a hydrogen molecule, in the presence of an intermetallic compound containing at least one first metal that is selected from the group consisting of palladium, platinum, rhodium, copper and iridium, and containing a second metal that is different from the first metal
Data Source
AI summary
A method of producing a hydrofluoroolefin includes reacting a chlorofluoroolefin that is represented by Formula (I) or Formula (II) and that has 8 or less carbon atoms with a hydrogen molecule, in the presence of an intermetallic compound containing at least one first metal that is selected from the group consisting of palladium, platinum, rhodium, copper and iridium, and containing a second metal that is different from the first metal, to obtain a hydrofluoroolefin in which a hydrogen atom is substituted for at least a chlorine atom represented by Cl among chlorine atoms contained in Formula (I) or Formula (II).