Copper Extrudate Catalysts for Ketone Hydrogenation
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Solution Overview
Problem
Current hydrogenation catalysts for converting ketone compounds to alcohols operate at high pressures and are prone to by-product formation, leading to catalyst fouling and reduced efficiency. There is a need for catalysts that can operate at lower pressures with improved activity and selectivity, while being free of chromium.
Innovation Solution
A hydrogenation catalyst comprising copper oxide, an alkali metal, and acid-stabilized silica, with a Brunauer-Emmett-Teller (BET) surface area of greater than or equal to 15 m2/g, is developed. The catalyst is prepared by mixing copper oxide with a clay material, combining it with an aqueous acid-stabilized silica solution, a caustic material, and water, and then calcining the mixture at a sufficient temperature and time to achieve the desired properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional copper chromium catalysts are used for hydrogenation, then high catalytic activity is achieved, but chromium toxicity and environmental hazards are introduced
Solution Approach 1:
The patent removes chromium from the catalyst composition entirely, extracting only the necessary copper component and replacing chromium's functional role with alternative materials (alkali metal hydroxide and acid-stabilized silica) that achieve the same catalytic effect without toxic side effects
Solution Approach 2:
The patent creates a composite catalyst system combining copper oxide, alkali metal hydroxide, and acid-stabilized silica in specific proportions. This composite material achieves the catalytic activity previously requiring chromium while eliminating its toxic effects through synergistic interactions between components
2Productivity
If high pressure conditions are used for hydrogenation, then reaction rate is increased, but operating costs and safety risks increase
Solution Approach 1:
The patent changes the catalytic parameters by introducing acid-stabilized silica with specific surface area characteristics (15-300 m²/g) and alkali metal content (0.1-10 wt%), which modifies the reaction pathway to achieve high rates at lower pressures through enhanced surface chemistry and intermediate stabilization
3Productivity
If conventional catalysts are used, then hydrogenation proceeds at acceptable rates, but by-product formation occurs leading to catalyst fouling
Solution Approach 1:
The patent applies local quality control by optimizing the distribution and concentration of alkali metal hydroxide (0.1-10 wt%) within the catalyst matrix, creating specific active sites that selectively promote the desired hydrogenation pathway while suppressing side reactions through localized chemical environment modification
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 exhibits high catalytic activity and selectivity for hydrogenation reactions, including the conversion of ketones to alcohols, while operating at lower pressures and avoiding chromium. It also shows improved crush strength and longer catalyst life compared to existing materials.
Implementation Method 1
Copper is a known catalyst for hydrogenation reactions
Implementation Method 2
an acid-stabilized silica, wherein the catalyst has a Brunauer-Emmett-Teller ('BET') surface area of greater than or equal to about 15 m2/g
Data Source
AI summary
A hydrogenation catalyst includes copper oxide, an alkali metal, and an acid-stabilized silica, wherein hydrogenation catalyst has a Brunauer-Emmett-Teller (“BET”) surface area of greater than or equal to about 15 m2/g. The hydrogenation catalysts are effective for converting aldehydes, ketones, and esters to alcohols and/or diesters to diols.