Vinylpyridine Resin Pore Structure for Catalyst Carrier Stability
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Solution Overview
Problem
Vinylpyridine resins used as catalyst carriers for methanol carbonylation are prone to pulverization and thermal decomposition, leading to accelerated degradation of catalytic activity due to pore clogging by substances released during these processes.
Innovation Solution
A vinylpyridine resin with a specific pore structure, characterized by a volume ratio of 3-5 nm pores of 4-60%, a total pore volume of 0.15-0.35 cc/g, and a specific surface area of 20-100 m^2/g, manufactured using a combination of good and poor solvents as porous agents, which reduces pulverization and thermal decomposition, maintaining catalytic activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vinylpyridine resin is used as catalyst carrier for methanol carbonylation, then catalytic activity is achieved, but the resin is prone to pulverization and thermal decomposition leading to pore clogging and accelerated degradation of catalytic activity
Solution Approach 1:
The patent changes the physical and chemical parameters of the resin structure, specifically controlling pore diameter (3-5 nm), volume ratio of small pores (4-60%), total pore volume (0.15-0.35 cc/g), and specific surface area (20-100 m²/g). These parameter optimizations enhance the resin's resistance to pulverization and thermal decomposition while maintaining catalytic activity, resolving the contradiction between reliability and structural stability.
Solution Approach 2:
The patent employs a composite porous structure combining different pore size distributions (micro-pores of 3-5 nm and larger pores) within the resin matrix. This composite pore structure provides both mechanical strength to prevent pulverization and adequate catalytic sites, while the synergistic structure resists thermal decomposition better than uniform pore structures, thus improving both reliability and structural stability.
2Productivity
If conventional vinylpyridine resin is used, then catalyst carrier function is provided, but pores become clogged by substances released during pulverization and thermal decomposition
Solution Approach 1:
By optimizing the pore diameter to 3-5 nm and controlling the volume ratio of these small pores to be 4-60% of total pores, the patent creates a pore structure that is resistant to clogging. The specific surface area (20-100 m²/g) and total pore volume (0.15-0.35 cc/g) are also controlled to maintain adequate reactant access while preventing pore blockage by decomposition products, thus maintaining productivity without suffering from substance loss due to pore clogging.
3Productivity
If resin structure is optimized for catalytic activity, then reaction efficiency increases, but resistance to pulverization and thermal decomposition decreases
Solution Approach 1:
The patent creates a composite pore structure with a hierarchical arrangement: micro-pores of 3-5 nm provide high surface area for catalytic activity (20-100 m²/g), while the controlled total pore volume (0.15-0.35 cc/g) and distribution include larger pores that provide structural integrity. This composite structure allows the resin to maintain both high reaction efficiency and adequate mechanical strength, resolving the contradiction between productivity and strength.
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 resin exhibits reduced pulverization and thermal decomposition rates, maintaining high catalytic activity and preventing pore clogging, thus enhancing the stability and efficiency of the carbonylation reaction.
Implementation Method 1
a rhodium complex supported on resin carrier
Implementation Method 2
a volume ratio of the pores having a diameter of 3 through 5 nm to all the pores of not less than 4% and not more than 60%; a total pore volume of not less than 0.15 cc/g and not more than 0.35 cc/g; and a specific surface area of not less than 20 m2
Data Source
Figure 1~3
Figure 4~5
AI summary
A vinylpyridine resin that is hardly pulverized and thermally decomposed such that the degradation of the catalytic activity is suppressed while having a pore volume and a specific surface area to maintain a sufficient catalytic activity, and also a method of manufacturing the vinylpyridine resin are provided. The resin represents: a volume ratio of the pores having a diameter of 3 through 5 nm to all the pores of not less than 4% and not more than 60%; a total pore volume of not less than 0.15 cc/g and not more than 0.35 cc/g; and a specific surface area of not less than 20 m2/g and not more than 100 m2/g. The resin can be manufactured by using a combination of a poor solvent, such as octane and not less than 50 wt% and not more than 90 wt% of a good solvent, in particular a compound having a benzene ring such as toluene, as porous agent.