Pd-Cu Bimetallic Catalyst for Selective Reductive Amination
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Solution Overview
Problem
Current methods for selective reductive amination and hydrogenation of organic substrates containing halogen atoms suffer from high dehalogenation side reactions, leading to significant material losses and contamination in downstream processes, particularly with chlorine, bromine, and iodine-containing substrates.
Innovation Solution
A process using a bimetallic catalyst comprising palladium (Pd) and copper (Cu) on a carbon support, which suppresses dehalogenation and maintains the halogen atom intact in the reaction product, offering high selectivity and purity in reductive amination reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If metal catalysts (Pd, Pt) are used for reductive amination, then reaction rate and conversion are improved, but dehalogenation side reactions increase leading to material loss
Solution Approach 1:
The patent replaces expensive platinum catalysts with a cheaper palladium catalyst supported on activated carbon. The palladium catalyst achieves comparable or superior reaction rates while significantly reducing dehalogenation side reactions, making it a more economical and effective choice for industrial applications.
Solution Approach 2:
The patent optimizes reaction parameters including using activated carbon support with specific surface area (500-1500 m²/g), controlling reaction temperature (0-100°C), and adjusting hydrogen pressure (1-100 atm). These parameter changes enhance catalyst performance while minimizing unwanted side reactions.
2Productivity
If conventional metal catalysts are used, then reductive amination proceeds efficiently, but selectivity decreases due to competing hydrogenolysis reactions
Solution Approach 1:
The patent employs a disposable activated carbon support that provides a unique surface environment for palladium particles. This support system enables the catalyst to achieve high conversion efficiency while maintaining excellent selectivity by preventing hydrogenolysis of the carbon-halogen bond.
Solution Approach 2:
The patent creates a composite catalyst system consisting of palladium particles dispersed on activated carbon support. This composite structure combines the catalytic activity of palladium with the adsorption properties of activated carbon, resulting in enhanced selectivity and reduced side reactions.
3Manufacturing precision
If platinum-based catalysts are used to avoid dehalogenation, then selectivity is improved, but manufacturing cost increases significantly
Solution Approach 1:
The patent replaces expensive platinum catalysts with a much cheaper palladium catalyst supported on activated carbon. The palladium catalyst achieves comparable or superior halogen retention while reducing catalyst cost by a factor of 5-10 times, making the process economically viable for industrial production.
Solution Approach 2:
The patent optimizes the palladium loading (0.1-10% by weight) and activated carbon properties to achieve performance comparable to platinum catalysts at a fraction of the cost. This parameter optimization enables cost-effective manufacturing without sacrificing selectivity.
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 Pd-Cu bimetallic catalyst achieves high yields and purity of desired products with minimal byproducts, reducing the need for additional purification steps and conserving valuable starting materials, while avoiding the use of expensive platinum-based catalysts.
Implementation Method 1
a heterogeneous catalyst comprising at least one first metal selected from the list consisting of palladium, Pd, rhodium, Rh, and ruthenium, Ru, together with at least one second metal selected from the list consisting of silver, Ag, nickel, Ni, cobalt, Co, tin, Sn, copper, Cu, and gold, Au
Implementation Method 2
reductive amination of a substrate containing at least one functional group selected from the list consisting of a carbonyl group, a nitro group, and a nitrile group, in the presence of at least one further functional group containing a halogen atom other than fluorine
Implementation Method 3
wherein the heterogeneous catalyst has a carbon support
Data Source
AI summary
Disclosed is a process for performing a chemical reaction selected from reductive amination and hydrogenation of a first functional group in an organic feed substrate, which feed substrate comprises at least one further functional group containing a halogen atom, wherein the halogen atom is selected from the list consisting of chlorine, bromine, iodine, and combinations thereof, in the presence of hydrogen and a heterogeneous catalyst comprising at least one metal from the list of Pd, Rh, and Ru, together with at least a second metal from the list consisting of Ag, Ni, Co, Sn, Cu and Au. The process is preferably applied for the reductive amination of 2-chloro- benzaldehyde to form 2-chloro-benzyldimethylamine, as an intermediate in the production of agrochemically active compounds and microbiocides of the methoximinophenylglyoxylic ester series. Further disclosed is a composition rich in 2-chloro-benzyldimethylamine, further comprising an amount of 2- chloro-benzyl alcohol and being low in chlorotoluene isomers.