Glycerol Conversion to Formic Acid via Vanadium Catalyst
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Solution Overview
Problem
Current methods for producing hydrogen from biomass, such as aqueous phase reforming of glycerol, face challenges in achieving high selectivity and efficiency due to high reaction temperatures and catalyst deactivation, while also being limited to diluted solutions, making it difficult to integrate biodiesel production into a renewable fuel concept effectively.
Innovation Solution
The method involves converting glycerol to formic acid using vanadium-substituted phosphomolybdic acid catalysts and molecular oxygen at relatively low temperatures, allowing for high-concentration glycerol solutions and achieving high selectivity and yield of formic acid, which can then be selectively converted to hydrogen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If aqueous phase reforming is used to produce hydrogen from glycerol, then hydrogen production is achieved, but the process requires high reaction temperatures and suffers from catalyst deactivation
Solution Approach 1:
The patent changes the reaction pathway from aqueous phase reforming to oxidative conversion, operating at lower temperatures (423-523 K) compared to conventional reforming methods. This parameter change in reaction conditions and mechanism resolves the contradiction by achieving hydrogen production without the high temperatures that cause catalyst deactivation.
Solution Approach 2:
The patent introduces formic acid as an intermediate product in the conversion of glycerol to hydrogen. This intermediary approach allows the reaction to proceed through a two-step process (glycerol to formic acid, then formic acid to hydrogen), avoiding the direct high-temperature reforming that causes catalyst deactivation while maintaining hydrogen production efficiency.
2Quantity of substance
If diluted glycerol solutions are used in aqueous phase reforming, then the process can operate, but conversion efficiency and productivity are limited
Solution Approach 1:
The patent changes the concentration parameter from diluted solutions to highly concentrated glycerol solutions (up to 90 wt%). This parameter change, combined with the oxidative conversion mechanism, resolves the contradiction by enabling both high glycerol concentration and high conversion efficiency, achieving up to 36.4 wt% formic acid yield.
3Speed
If high reaction temperatures are used for hydrogen production, then reaction rate increases, but selectivity decreases and catalyst deactivation occurs
Solution Approach 1:
The patent changes the temperature parameter to lower operating conditions (423-523 K) and introduces molecular oxygen as a reactant. This parameter change resolves the contradiction by maintaining high reaction rates through the oxidative mechanism while achieving high selectivity for formic acid production, avoiding the side reactions and catalyst deactivation associated with high temperatures.
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
This process achieves exceptionally high conversion efficiency of glycerol to formic acid, with yields up to 36.4 wt%, enabling a more efficient and cost-effective route for hydrogen production from biodiesel byproducts, integrating biodiesel into the renewable fuel concept and offering advantages in storage and transportation of hydrogen.
Implementation Method 1
converting glycerol to formic acid in the presence of a catalyst and O2 at a temperature of about 455 K or less
Implementation Method 2
converting glycerol to formic acid using vanadium-substituted phosphomolybdic acid catalysts and molecular oxygen
Data Source
AI summary
Embodiments of the present disclosure provide for methods of converting glycerol to formic acid and the like.