Ionic Liquid Coated Catalyst for Selective Hydrogenation
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Solution Overview
Problem
Existing catalysts used in selective hydrogenation reactions, such as those for aromatic compounds and polyunsaturated compounds, suffer from high levels of undesirable by-products, particularly at high conversion rates, due to limited selectivity.
Innovation Solution
A porous heterogeneous transition metal catalyst coated with an ionic liquid is used, which enhances selectivity and allows for high conversion rates by maintaining the ionic liquid coating under reaction conditions that prevent its detachment, utilizing metals like nickel, cobalt, and palladium, and specific ionic liquids with organic cations and anions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional supported metal catalysts are used for selective hydrogenation, then the desired hydrogenation reaction is accelerated, but the proportion of undesirable by-products is high, particularly at high conversion rates
Solution Approach 1:
An ionic liquid coating is applied to the catalyst surface to act as an intermediary layer between the reactants and the metal catalyst. This coating selectively interacts with polyunsaturated compounds, allowing them to access the catalyst surface while blocking less reactive monounsaturated compounds, thereby improving selectivity at high conversion rates
Solution Approach 2:
The ionic liquid coating changes the surface properties and local environment of the catalyst. By modifying the chemical and physical parameters at the catalyst surface, the coating enhances selectivity for specific reactions while maintaining high conversion rates through optimized reactant-catalyst interactions
2Manufacturing precision
If the ionic liquid coating is applied to enhance selectivity, then high selectivity is achieved, but the catalyst must be subjected to specific reaction conditions to prevent the IL coating from detaching
Solution Approach 1:
The ionic liquid coating is designed to be stable under specific reaction conditions but can be easily removed or replaced. This allows for simple regeneration of the catalyst by removing the coating and applying a fresh layer, maintaining high selectivity without complex permanent modifications to the catalyst structure
3Volume of moving object
If larger catalyst forms are used, then the catalyst can be used in various configurations, but there is significant loss in selectivity
Solution Approach 1:
The catalyst employs a porous structure with controlled pore sizes that allow reactants to access internal surface areas. The ionic liquid coating is applied within these pores, ensuring that even in larger catalyst forms, the active sites remain accessible and selective through the porous architecture that maintains high surface area to volume ratio
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 selectivity and conversion rates in hydrogenation reactions, reducing the formation of undesirable by-products and maintaining activity, even in larger catalyst forms without significant loss in selectivity.
Implementation Method 1
A porous heterogeneous transition metal catalyst, the inner surface of which is coated with an ionic liquid
Data Source
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AI summary
The invention relates to a porous heterogeneous catalyst. In order to prepare a catalyst that, with relatively high selectivity, catalyzes the hydrogenation of isolated unsaturated bindings of multiple unsaturated compounds, it is recommended according to the present invention that the inner surface of the catalyst is covered with an ionic fluid.