Boron-Doped Graphene Solid Acid Catalyst for Stable Esterification
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Solution Overview
Problem
Conventional carbon-based solid acid catalysts suffer from insufficient catalytic activity and degradation when used repeatedly, particularly in aqueous environments, limiting their industrial application as alternatives to sulfuric acid.
Innovation Solution
A carbon-based solid acid catalyst is developed by incorporating boron into the carbonaceous material through a doping process, followed by carbonization and sulfonation, resulting in a material with a graphene structure and high sulfonic acid group content, which maintains catalytic activity even after repeated use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional carbon-based solid acid catalysts are used, then they can be easily separated and recovered from products, but they have insufficient catalytic activity and degrade when used repeatedly
Solution Approach 1:
The patent changes the chemical composition parameters of the carbon-based material by introducing boron elements and controlling the sulfuric acid treatment conditions. This modifies the catalytic properties to achieve both high initial activity and long-term stability, resolving the contradiction between productivity and reliability
Solution Approach 2:
The patent creates a composite structure combining carbonaceous materials with boron compounds and sulfonic acid groups. This composite approach enhances both the catalytic activity and the stability of the material, allowing it to maintain performance over repeated use cycles
2Productivity
If sulfuric acid is used as acid catalyst, then it has low price and high catalytic activity, but large amount of energy is required for separation, recovery, purification, and recycling
Solution Approach 1:
The patent replaces the liquid sulfuric acid system with a solid carbon-based catalyst system. This substitution eliminates the need for complex separation, recovery, and purification processes, dramatically reducing energy consumption while maintaining catalytic functionality
Solution Approach 2:
The solid carbon-based catalyst can be easily separated from reaction products through filtration or decantation, and then recovered and reused multiple times without significant loss of activity, eliminating the energy-intensive processing required for liquid acid catalysts
3Ease of operation
If solid acid catalysts such as silica-alumina or zeolite are used, then they can be easily separated from products, but they decrease in catalytic activity when used in water
Solution Approach 1:
The patent modifies the chemical parameters of the carbon-based material by introducing boron and sulfonic acid groups, which enhance its stability in aqueous environments. This allows the catalyst to maintain high activity in water-based reactions while retaining easy separation properties
Solution Approach 2:
The creation of a composite carbon-boron-sulfuric acid system provides both hydrophobic carbon structure for easy separation and hydrophilic sulfonic acid groups for water compatibility, resolving the contradiction between ease of operation and adaptability
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 boron-doped, graphene-containing carbon-based solid acid catalyst exhibits high and stable catalytic activity for chemical reactions, including esterification and hydrolysis, even at elevated temperatures, outperforming conventional catalysts in terms of yield and retention rates.
Implementation Method 1
a boron doping step including mixing a carbonaceous material precursor and a boron-containing compound
Implementation Method 2
a carbonizing step including heating a boron-containing carbonaceous material precursor to carbonize at least part of the boron-containing carbonaceous material precursor
Implementation Method 3
a sulfonic acid group introducing step including mixing a boron-containing carbonaceous material with at least one selected from the group consisting of concentrated sulfuric acid, fuming sulfuric acid, and sulfur trioxide
Implementation Method 4
The carbon-based solid acid catalyst exhibits high and stable catalytic activity for chemical reactions, including esterification and hydrolysis
Data Source
AI summary
[Problem] The main purpose is to provide a novel carbon-containing solid acid which has an excellent catalytic activity and of which the catalytic activity cannot be deteriorated easily even when used repeatedly. [Solution] A carbon-containing solid acid which comprises a carbonaceous material having a sulfonate group, wherein the carbonaceous material has a graphene structure in at least a part thereof and contains boron.