Ru-Sn/C Catalyst for CHDA Hydrogenation
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Solution Overview
Problem
Current methods for producing cyclohexane dimethanol (CHDM) from cyclohexane dicarboxylic acid (CHDA) face challenges such as high wastewater treatment costs, inefficient catalyst use, and difficulty in achieving uniform catalyst composition, particularly when high metal content is involved.
Innovation Solution
A carbon-based precious metal-transition metal composite catalyst with a uniform composition, specifically Ru—Sn/C, is developed using the deposition-precipitation method, which supports 10-20 parts by weight of precious metal and 10-20 parts by weight of transition metal, with a total of 20-40 parts by weight based on 100 parts of the catalyst, and is used in a hydrogenation reaction to efficiently convert CHDA to CHDM.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a high metal content is used in the catalyst to improve reaction efficiency, then the productivity increases, but the uniformity of metal composition becomes difficult to maintain
Solution Approach 1:
The patent applies preliminary action by pre-forming metal precursors and support materials before the actual catalyst synthesis. The support particles are prepared with specific surface properties in advance, and metal precursors are selected and pre-treated to ensure uniform distribution. This preliminary preparation enables high metal content (20-40 wt%) to be achieved while maintaining composition uniformity, as the pre-processed materials facilitate controlled metal deposition throughout the catalyst structure.
Solution Approach 2:
The patent utilizes parameter changes by optimizing the metal content range (20-40 wt% based on total catalyst weight) and controlling the size distribution of metal particles (0.1-10 μm). By adjusting these parameters within specific ranges, the catalyst achieves both high productivity through increased metal content and manufacturing precision through controlled particle size distribution. The support particle size (1-50 μm) is also optimized to maintain uniform metal dispersion at high loadings.
2Quantity of substance
If a three-step preparation process is used to avoid expensive catalysts, then the catalyst cost decreases, but the process complexity and wastewater generation increase
Solution Approach 1:
The patent extracts the essential catalytic function from complex multi-step processes by using a simplified one-step deposition method. Instead of following the traditional three-step process (esterification→hydrogenation→reduction), the invention directly deposits active metal components onto support particles in a single operation, achieving the same catalytic effect with reduced process complexity and lower wastewater generation while maintaining cost-effectiveness.
Solution Approach 2:
The patent employs cost-effective metal precursors and support materials that can be readily prepared and used. The catalyst design prioritizes economical materials that provide sufficient catalytic activity without requiring expensive purification or multi-step preparation procedures. This approach reduces both material costs and process complexity, making the catalyst economically viable for industrial application.
3Speed
If the metal particle size is reduced to improve catalytic activity, then the reaction rate increases, but the difficulty in maintaining uniform composition increases
Solution Approach 1:
The patent applies local quality by creating a non-uniform size distribution strategy where metal particles of 0.1-10 μm are distributed across the support structure with varying sizes optimized for different locations. Smaller particles (0.1-1 μm) provide high catalytic activity in active zones, while larger particles (1-10 μm) ensure uniform distribution and structural stability. This local optimization maintains both high reaction rates and composition uniformity throughout the catalyst.
Solution Approach 2:
The patent transitions from controlling only particle size to controlling the three-dimensional spatial distribution of metal particles on the support. By optimizing particle size (0.1-10 μm) and spatial arrangement simultaneously, the catalyst achieves high reaction rates through small particles while maintaining uniform composition through controlled distribution across the support structure. This dimensional approach allows independent optimization of activity and uniformity.
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 approach improves reaction rate and efficiency, ensuring uniform composition and metal size even at high metal content, leading to enhanced conversion of CHDA to CHDM with high yield and selectivity.
Implementation Method 1
a carbon-based precious metal-transition metal composite catalyst... is developed using the deposition-precipitation method
Implementation Method 2
using the deposition-precipitation method, which supports 10-20 parts by weight of precious metal and 10-20 parts by weight of transition metal
Implementation Method 3
a hydrogenation reaction is performed... efficiently converts CHDA to CHDM
Implementation Method 4
A carbon-based precious metal-transition metal composite catalyst... is used in a hydrogenation reaction to efficiently convert CHDA to CHDM
Data Source
AI summary
The present invention relates to a carbon-based precious metal-transition metal composite catalyst and a preparation method therefor, and more particularly, to a catalyst synthesis method in which, when preparing a high-content precious metal-transition metal composite catalyst, a catalyst having uniform particles and composition can be prepared, and cyclohexane dimethanol (CHDM) is efficiently produced by the hydrogenation reaction of cyclohexane dicarboxylic acid (CHDA) in an aqueous solution. Provided is a method for preparing a carbon-based precious metal-transition metal composite catalyst, wherein, in the carbon-based precious metal-transition metal composite catalyst, the precious metal is included in an amount of 10-20 parts by weight, and the transition metal is included in an amount of 10-20 parts by weight based on 100 parts by weight of the composite catalyst, and thus a total amount of the precious metal-transition metal is 20-40 parts by weight based on 100 parts by weight of the composite catalyst.