Carbon-Based Noble Metal-Transition Metal Catalyst for Selective Conversion
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Solution Overview
Problem
Existing catalysts for converting cyclohexanedicarboxylic acid to cyclohexanedimethanol require high-pressure conditions, are costly, and involve complex multi-step synthesis processes, leading to high production costs and potential Al leaching issues due to low hydrothermal stability of Al2O3 carriers.
Innovation Solution
A carbon-based noble metal-transition metal composite catalyst using a carbon carrier with a high volume ratio of mesopores, pre-treated with an aqueous nitric acid solution, supports active metals like ruthenium and tin, enabling high selective conversion of carboxylic acid groups to alcohol groups at lower pressures and reduced costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Al2O3 carrier is used for RuPtSn catalyst, then catalyst activity is improved, but hydrothermal stability deteriorates leading to Al leaching
Solution Approach 1:
The patent changes the carrier material from Al2O3 to carbon-based material, fundamentally altering the chemical and thermal stability parameters. Carbon material provides resistance to hydrothermal conditions while maintaining catalyst activity, eliminating Al leaching issues that occur with Al2O3 carriers under high-temperature acidic conditions
Solution Approach 2:
The patent uses a composite structure combining carbon material with Ru-Sn active metal components. This composite approach leverages the hydrothermal stability of carbon while incorporating the catalytic activity of Ru-Sn, creating a material that simultaneously achieves both reliability and productivity
2Productivity
If Pt is added to RuSn/C catalyst, then catalyst activity is improved, but cost increases
Solution Approach 1:
The patent removes Pt from the catalyst composition, extracting only the essential Ru-Sn active metal components. This elimination of expensive Pt while retaining catalytic functionality through Ru-Sn synergy directly reduces catalyst cost while maintaining or improving activity
Solution Approach 2:
The patent replaces expensive Pt with cheaper Ru-Sn combination, using more abundant and cost-effective materials to achieve the same catalytic function, thereby reducing overall catalyst cost
3Area of stationary object
If OMC with high pore volume is used as carrier, then catalyst dispersion is improved, but mechanical strength deteriorates
Solution Approach 1:
The patent employs porous carbon material as carrier, utilizing its inherent porous structure to provide high specific surface area for catalyst dispersion. The carbon-based porous structure naturally offers both high surface area and adequate mechanical strength, avoiding the strength problems associated with OMC
4Reliability
If multi-step synthesis process is used for Al2O3 carrier coated with carbon layer, then catalyst performance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent extracts and eliminates the complex multi-step coating process by directly using carbon material as the carrier instead of coating carbon onto Al2O3. This simplification removes unnecessary intermediate steps while maintaining catalyst performance
Solution Approach 2:
The patent performs preliminary preparation of carbon carrier with appropriate pore structure and surface properties before catalyst synthesis, eliminating the need for subsequent coating steps. This preliminary structuring of the carbon carrier ensures optimal catalyst performance from the outset
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 activity and selectivity in converting cyclohexanedicarboxylic acid to cyclohexanedimethanol at lower pressures and costs, with improved mechanical strength and reduced production complexity.
Implementation Method 1
the amount of oxygen functional groups introduced on the surface of the carbon carrier is small. Thus, it is disadvantageous in effectively immobilizing a Ru—Sn active metal
Implementation Method 2
a carbon-based noble metal-transition metal composite catalyst enabling high selective conversion of a carboxylic acid functional group into an alcohol functional group
Data Source
AI summary
Provided are a carbon-based noble metal-transition metal composite catalyst enabling high selective conversion of a carboxylic acid functional group into an alcohol functional group by pre-treating a carbon carrier including a predetermined ratio or more of mesopores, and a production method therefor.