Heterogeneous Catalyst for Performic Acid via Porous Composite
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Solution Overview
Problem
Current catalysts for producing performic acid (PFA) face challenges such as equilibrium limitations, corrosion issues, and instability in the presence of hydrogen peroxide, leading to low process yields and operational costs.
Innovation Solution
A heterogeneous catalyst system comprising a mesoporous catalyst material with inherent surface acidity or basicity, combined with co-catalysts like WO3 and Ag2O, which are dispersed as particles or thin films. This system allows for precise control of reaction conditions and enhances the stability and activity of the catalyst.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a homogeneous catalyst like strong mineral acid is used for PFA production, then the reaction rate is improved, but corrosion issues and catalyst stability deteriorate
Solution Approach 1:
The patent employs a heterogeneous catalyst consisting of solid acid sites supported on a porous material with specific surface area of 10-1000 m²/g. The porous structure provides high surface area for catalytic activity while maintaining physical stability and resistance to corrosion in the aqueous reaction medium, resolving the contradiction between reaction rate and catalyst stability.
Solution Approach 2:
The catalyst is designed as a composite material combining solid acid sites (such as sulfonic acid groups) with a porous support matrix. This composite structure integrates the high catalytic activity of acid sites with the mechanical stability and corrosion resistance of the porous support, eliminating the deactivation issues of homogeneous mineral acids.
2Productivity
If the reaction is equilibrium limited, then the process yield is reduced, but using reactive distillation increases complexity
Solution Approach 1:
The patent removes the product performic acid from the reaction zone continuously via extraction or phase separation, shifting the equilibrium toward product formation according to Le Chatelier's principle. This allows high conversion without requiring complex reactive distillation equipment, as the product removal is achieved through simpler extraction mechanisms.
3Quantity of substance
If formic acid and hydrogen peroxide are mixed in equilibrium limited reaction, then unreacted materials remain, but extended reaction time increases loss of time
Solution Approach 1:
The patent implements continuous removal of the product performic acid from the reaction system, maintaining the driving force for reaction throughout the process. This continuous product extraction ensures high conversion of reactants without requiring extended reaction times, as the equilibrium is continuously shifted toward product formation.
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 proposed catalyst system achieves high activity and stability for PFA synthesis, enabling efficient production in various reactor systems and reducing operational costs by minimizing catalyst deactivation and corrosion issues.
Implementation Method 1
A heterogeneous catalyst system comprising a mesoporous catalyst material with inherent surface acidity or basicity, combined with co-catalysts like WO3 and Ag2O
Implementation Method 2
The mesoporous catalyst material has a specific surface area ranging from about 100 to about 600 m2/g
Data Source
AI summary
The present disclosure provides a catalyst for the production of percarboxylic acids which includes a co-catalyst 1 being either a transition metal oxide or carbonaceous compound and a second co-catalyst 2, distinct from co-catalyst 1 and being comprised of at least one transition metal, transition metal oxide, transition metal carbide or transition metal nitride. The combination of these co-catalysts provides the necessary kinds of catalytic active sites for both the chemisorption and activation of formic acid as well as active sites for the generation of surface active oxygen species. The combination of these co-catalyst materials results in the synergistic benefits of enhancement in catalytic activity for the production of the peracid as well as improved catalyst stability.