A-B-OMS Catalyst for Base-Free Selective Oxidation
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Solution Overview
Problem
Current catalysts for selective oxidation of biomass-derived compounds like 5-hydroxymethylfurfural (HMF) face challenges such as lack of recyclability, requirement of external bases, high oxygen pressures, and time-consuming processes, which hinder the production of high yields of valuable chemicals like 2,5-furandicarboxylic acid (FDCA) in an environmentally friendly and cost-effective manner.
Innovation Solution
Development of a novel, cost-effective, and recyclable catalyst composition A-B-OMS, where 'A' is a noble metal and 'B' is an alkali or alkaline earth metal, supported on octahedral molecular sieves (OMS) like todorokite and cryptomelane, which enables base-free selective aerobic oxidation of HMF, glucose, and furfural to produce high yields of FDCA, Gluconic Acid, and Furoic Acid under optimized conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional catalysts are used for selective oxidation of HMF, then oxidation reaction can be carried out, but the catalyst lacks recyclability and requires external bases and high oxygen pressures
Solution Approach 1:
The invention extracts and eliminates the need for external bases and high oxygen pressure conditions from the oxidation process by designing a catalyst (A-B-OMS) with integrated basic sites within its structure. The basic sites are incorporated into the octahedral molecular sieve framework, allowing the catalyst to function autonomously without requiring additional base additives or extreme pressure conditions.
Solution Approach 2:
The invention employs a composite catalyst structure A-B-OMS where noble metal A is combined with basic sites B within the octahedral molecular sieve OMS framework. This composite structure integrates multiple functions (catalytic activity from noble metal and basic properties from site B) into a single material, enabling both high catalytic performance and recyclability without requiring separate base additives.
2Productivity
If conventional oxidation processes are used, then oxidation of HMF can be achieved, but the process is time-consuming and requires high oxygen pressure
Solution Approach 1:
The invention changes the reaction parameters by enabling the oxidation to proceed at atmospheric oxygen pressure (1 atmosphere) rather than high pressure conditions. The unique A-B-OMS catalyst structure facilitates rapid electron transfer and oxygen activation, allowing the reaction to achieve high productivity under milder pressure conditions, thus improving safety and reducing equipment requirements.
3Object-affected harmful factors
If base-free oxidation is implemented, then environmental sustainability is improved, but achieving high yield in short time is challenging
Solution Approach 1:
The A-B-OMS catalyst is designed to be self-sufficient by incorporating basic sites directly into its structure. This eliminates the need for external base additives, making the process environmentally friendly. The catalyst's internal basic sites autonomously facilitate the oxidation reaction, achieving both green chemistry goals and high productivity without requiring additional chemical auxiliaries.
4Power
If noble metal catalysts are used, then catalytic activity is improved, but cost-effectiveness decreases
Solution Approach 1:
The invention applies local quality by concentrating the noble metal A specifically at active sites within the A-B-OMS structure rather than using bulk noble metal. This localized placement maximizes the catalytic activity per unit of noble metal while minimizing the overall amount of expensive material required, thereby improving cost-effectiveness while maintaining high catalytic 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 A-B-OMS catalyst achieves high yields and selectivity of FDCA, Gluconic Acid, and Furoic Acid in shorter reaction times without the need for external bases, ensuring recyclability and environmental sustainability, making the process industrially viable and cost-effective.
Implementation Method 1
A-B-OMS catalyst achieves high yields and selectivity of FDCA, Gluconic Acid, and Furoic Acid in shorter reaction times
Implementation Method 2
base-free green process for selective aerobic oxidation of 5-hydroxymethylfurfural (HMF), glucose, glycerol and furfural by said catalyst
Implementation Method 3
A-B-OMS, wherein 'A' is selected from noble metals; 'B' is selected from alkali or alkaline earth metals; and OMS is octahedral molecular sieve
Data Source
AI summary
Described herein is a novel, cost effective, stable and recyclable catalyst composition i.e. A-B-OMS, wherein ‘A’ is selected from noble and transition metals; ‘B’ is selected from alkali or alkaline earth metals; and OMS is octahedral molecular sieve which includes synthetic todorokite (OMS-1) and cryptomelane (OMS-2); and characterization thereof. Further the invention provides base free green process for selective aerobic oxidation of 5-hydroxymethylfurfural (HMF) catalyzed by said catalyst composition under optimized reaction conditions to obtain high yield of 2,5-furandicarboxylic acid (FDCA) in a shorter span of time. Invention also provides for selective oxidation of glucose to Gluconic Acid, furfural to furoic Acid and glycerol to Glyceric acid. Invention can also applicable for the selective oxidation of hexoses, pentoses, disaccharides to corresponding acids.