Vinylpyridine Resin Catalyst Support for Methanol Carbonylation
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Solution Overview
Problem
The existing vinylpyridine resins used as catalyst supports for methanol carbonylation reactions face challenges in maintaining high catalytic activity while ensuring heat and abrasion resistance, as increased crosslinking decreases pore diameter and pyridine group content, leading to reduced catalytic performance.
Innovation Solution
A vinylpyridine resin with specific properties is developed, including a nitrogen content of 3.00% to 8.00% by mass, a degree of crosslinking of 35% to 70% by mole, a C/N molar ratio of 12.00 to 36.00, a total pore volume of 0.20 to 0.45 cc/g, a specific surface area of 70.0 to 280.0 m2/g, and an average pore diameter of 5.0 to 25.0 nm, along with a high proportion of pores with diameters of 10 nm or more, which enhances heat resistance, abrasion resistance, and catalytic activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the degree of crosslinking is increased to improve heat resistance and abrasion resistance, then the structural stability is improved, but the pore diameter decreases and pyridine group content decreases, leading to reduced catalytic activity
Solution Approach 1:
The patent precisely controls the degree of crosslinking within 35-70% by mole, nitrogen content within 3.00-8.00% by mass, and C/N ratio within 12.00-36.00. These parameter ranges optimize the balance between crosslinking density (for heat and abrasion resistance) and pore structure/pyridine group content (for catalytic activity), resolving the contradiction between structural stability and catalytic performance
Solution Approach 2:
The vinylpyridine resin is synthesized as a crosslinked composite material combining vinylpyridine monomer with crosslinking agents (divinylbenzene, dimethyl vinyl benzene, or glycidyl methacrylate). This composite structure provides both the mechanical/thermal stability from crosslinking and the catalytic functionality from pyridine groups, simultaneously achieving heat resistance, abrasion resistance, and high catalytic activity
2Strength
If the degree of crosslinking is increased to improve abrasion resistance, then the catalyst support durability is improved, but the pore volume and surface area decrease, reducing the catalyst activity
Solution Approach 1:
The patent establishes an optimal window for degree of crosslinking (35-70% by mole) that balances abrasion resistance with pore structure preservation. Within this range, the crosslinked network provides mechanical strength while maintaining sufficient pore volume (0.20-0.45 cc/g) and specific surface area (70.0-280.0 m2/g) for high catalytic activity
Solution Approach 2:
The crosslinking is distributed throughout the resin matrix to provide uniform mechanical strength and abrasion resistance, while the pore structure and pyridine groups are maintained in specific regions to ensure catalytic activity. This spatial differentiation of properties allows simultaneous optimization of both durability and performance
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 optimized vinylpyridine resin exhibits improved heat resistance, abrasion resistance, and catalytic activity, allowing for efficient production of acetic acid with prolonged catalyst life and reduced thermal decomposition rates, even under high-temperature conditions.
Implementation Method 1
the vinylpyridine resin has sufficient specific surface area, pore volume, average pore diameter, heat resistance, and abrasion resistance
Implementation Method 2
a technique for allowing a reaction to proceed in a heterogeneous system using a catalyst in which rhodium is supported on a porous vinylpyridine resin
Data Source
AI summary
A vinylpyridine resin for a catalyst support; a method for producing thereof; and a catalyst for carbonylation of methanol are disclosed. The vinylpyridine resin has: content of nitrogen derived from a pyridine group of 3.00% by mass or more and 8.00% by mass or less; degree of crosslinking of 35% by mole or more and 70% by mole or less; molar ratio C/N of carbon atoms to nitrogen atoms of 12.00 or more and 36.00 or less; total pore volume of 0.20 cc/g or more and 0.45 cc/g or less; specific surface area of 70.0 m2/g or more and 280 m2/g or less; average pore diameter of 5.0 nm or more and 25.0 nm or less; and proportion of a volume of pores having a pore diameter of 10 nm or more to a volume of the whole pores of 4.0% or more and 90.0% or less.