Catalyst Pore Structure for Ester Production Durability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing catalysts for producing carboxylic acid ester suffer from reduced activity and selectivity due to pH swing and temperature resistance issues, leading to decreased durability over long-term use.
Innovation Solution
A catalyst with a narrow pore diameter distribution, specifically a half-width of 10 nm or less, is developed using catalyst particles like nickel, cobalt, palladium, and gold supported on an aluminum-containing silica-based composition, ensuring uniform pore structure and enhanced pH and temperature resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a basic substance is added to control pH during reaction, then pH is maintained in a predetermined range, but local elevation of pH occurs which reduces catalyst durability
Solution Approach 1:
A basic substance (alkali metal hydroxide, alkali metal carbonate, or alkaline earth metal hydroxide) is introduced as an intermediary to neutralize the acid byproduct (methacrylic acid) generated during the oxidation reaction. This mediator maintains the pH within a predetermined range (6-9) without requiring direct manipulation of the reaction conditions, thereby preserving catalyst durability while simplifying operation.
2Productivity
If the catalyst is used for long-term production over several years, then high productivity is achieved, but pH swing and temperature exposure reduce catalyst activity and selectivity
Solution Approach 1:
The catalyst is pre-treated with a basic substance to establish a buffered environment before the oxidation reaction begins. This prior cushioning against acid byproducts (pH swing) protects the catalyst structure and active sites from degradation, maintaining consistent activity and selectivity throughout long-term operation (several years) and ensuring sustained productivity.
3Productivity
If the catalyst operates at relatively high temperatures for long-term use, then reaction efficiency is maintained, but temperature exposure reduces catalyst activity and selectivity over time
Solution Approach 1:
The operating temperature is optimized within a specific range (60-100°C) to balance reaction efficiency with catalyst stability. By controlling the temperature parameter within this window, the catalyst maintains high productivity while minimizing thermal degradation of active sites and selectivity loss over long-term operation.
4Adaptability or versatility
If the pore diameter distribution of the support is wide, then catalyst flexibility is improved, but variation in pore diameter reduces catalyst durability
Solution Approach 1:
The support structure is designed with a controlled pore diameter distribution where the half-width (Wa) is specifically optimized to balance flexibility and durability. This local quality control ensures that pores within the catalyst maintain appropriate dimensions for reactant diffusion while providing structural stability, enabling the catalyst to adapt to reaction conditions without compromising long-term durability.
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 improved durability, pH swing resistance, and temperature resistance, maintaining high reactivity and selectivity over extended periods.
Implementation Method 1
setting a half-width of pore diameter distribution of a catalyst for production of carboxylic acid ester, which is measured by a predetermined method, to a predetermined range so that variation in pore diameter inside pores of a support is suppressed
Implementation Method 2
catalyst particles comprising at least one element selected from the group consisting of nickel, cobalt, palladium, lead, platinum, ruthenium, gold, silver, and copper
Implementation Method 3
the half-width Wa being calculated using BJH method from an adsorption isotherm obtained by nitrogen adsorption
Data Source
AI summary
A catalyst for production of carboxylic acid ester, containing:catalyst particles containing at least one element selected from the group consisting of nickel, cobalt, palladium, lead, platinum, ruthenium, gold, silver, and copper; anda support supporting the catalyst particles, whereinthe catalyst for production of carboxylic acid ester has half-width Wa of pore distribution of 10 nm or less, the half-width Wa being calculated using BJH method from an adsorption isotherm obtained by nitrogen adsorption.