Surface-Modified Calcium Carbonate Catalyst Carrier for Metal Loading Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current catalyst systems face challenges such as high transition metal consumption, toxicity, rare resource availability, high costs, and environmental impact due to the need for low catalyst loadings and efficient recycling.
Innovation Solution
A catalyst system comprising a transition metal compound on a solid carrier made from surface-reacted calcium carbonate, which is treated with CO2 and H+ ion donors to create a specific surface area and pore volume, reducing the amount of transition metal required while enhancing catalytic activity and recyclability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional calcium carbonate carriers are used, then the catalyst system is simple and easy to manufacture, but the catalytic activity is insufficient requiring higher catalyst loadings
Solution Approach 1:
The patent applies parameter changes by treating calcium carbonate carriers with specific acids (nitric acid, hydrochloric acid, sulfuric acid, or phosphoric acid) to modify surface properties. This chemical treatment changes the surface area, pore volume, and surface chemistry of the carrier, enabling higher catalytic activity at lower transition metal loadings. The acid treatment creates surface defects and increases basicity, which enhances the interaction with transition metal compounds and improves catalytic performance.
Solution Approach 2:
The patent creates a composite material system combining treated calcium carbonate carrier with transition metal compounds. The composite consists of the modified calcium carbonate support (with enhanced surface area and pore structure) and the active transition metal catalyst, where the carrier provides structural support and surface properties that enhance catalyst dispersion and activity, reducing the required amount of expensive transition metal.
2Productivity
If higher catalyst loadings are used to improve catalytic activity, then conversion rates increase, but transition metal consumption and costs increase
Solution Approach 1:
By changing the physical and chemical parameters of the calcium carbonate carrier through acid treatment, the patent achieves higher catalytic activity per unit of transition metal. The treated carrier provides better dispersion and stabilization of transition metal species, increasing the effective utilization of each metal atom and reducing overall metal consumption while maintaining high conversion rates.
Solution Approach 2:
The modified calcium carbonate carrier acts as a self-service support that actively enhances catalyst performance through its improved surface properties. The carrier's increased basicity and surface area automatically promote better metal dispersion and stability, reducing the need for additional metal loading to achieve desired conversion rates.
3Ease of operation
If conventional carriers are used, then manufacturing is simple, but catalyst recovery and recycling are difficult
Solution Approach 1:
The acid treatment of calcium carbonate carriers modifies physical parameters such as surface area, pore volume, and particle morphology. These changes improve the carrier's mechanical strength and surface properties, making the catalyst system more robust during filtration and washing operations. The treated carriers provide better catalyst retention during recovery while maintaining ease of preparation through straightforward acid treatment protocols.
4Object-affected harmful factors
If transition metal loadings are reduced to lower costs and environmental impact, then sustainability improves, but catalytic activity decreases
Solution Approach 1:
The patent uses parameter changes in the carrier properties (surface area, pore volume, surface chemistry) to decouple the relationship between catalyst loading and catalytic activity. By optimizing the carrier's physical and chemical parameters through acid treatment, the system achieves high catalytic activity with reduced transition metal content, thereby lowering environmental impact and costs without sacrificing productivity.
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 system achieves higher conversion rates and easier recovery, with improved catalytic activities in reactions like C-C cross coupling and glycerol hydrogenolysis, while reducing the overall consumption of transition metals and environmental impact.
Implementation Method 1
surface-reacted calcium carbonate which is treated with CO2 and H+ ion donors to create a specific surface area and pore volume
Implementation Method 2
catalyst system comprising a transition metal compound on a solid carrier... improved catalytic activities in reactions like C-C cross coupling and glycerol hydrogenolysis
Data Source
AI summary
The present invention relates to a catalyst system comprising a transition metal compound on a solid carrier which is a "surface-reacted calcium carbonate" comprising calcium carbonate and a water-insoluble calcium salt other than calcium carbonate, such as hydroxylapatite. The invention further relates to a method for manufacturing said catalyst system and to its use in heterogeneous catalysis, especially in C-C cross couplings and glycerol hydrogenolysis.