Carbonate-Modified Formate Hydrogen Release With Low CO Contamination
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Solution Overview
Problem
Existing hydrogen storage systems using a bicarbonate/formate-based aqueous reaction suffer from CO contamination in released hydrogen, necessitating energy and cost-intensive purification steps, which is problematic for low-temperature fuel cells.
Innovation Solution
Incorporating a carbonate salt, particularly K2CO3, into the bicarbonate/formate-based aqueous reaction system at specific concentrations (0.2-0.4 M) and using a Pd/TiO2-based catalyst prepared by deposition precipitation, enhances the purity of released hydrogen by minimizing CO contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If commercially available catalysts such as Pd/C are used for hydrogenation and dehydrogenation reactions, then the hydrogen storage and release process can proceed, but CO contamination is generated in the released hydrogen
Solution Approach 1:
The patent modifies the chemical composition parameters of the reaction system by introducing carbonate salts (specifically K2CO3 at concentrations of 0.2-0.4 M) to alter the reaction pathway and suppress CO formation during formate dehydrogenation, while maintaining high hydrogen release rates
Solution Approach 2:
Carbonate salts act as an intermediary substance in the reaction system, mediating between the formate and catalyst to prevent direct pathways that lead to CO formation, thereby reducing CO contamination without sacrificing hydrogen productivity
2Power
If CO-contaminated hydrogen is used in low-temperature fuel cells with Pt anodes, then energy can be generated, but the Pt anodes are poisoned by CO
Solution Approach 1:
The patent applies preliminary action by pre-treating the hydrogen production process with carbonate salts to prevent CO formation before the hydrogen reaches the fuel cell, thereby protecting the Pt anodes from poisoning and ensuring reliable operation without requiring subsequent purification
3Manufacturing precision
If purification steps are added to remove CO contamination, then hydrogen purity is improved, but energy and cost increase
Solution Approach 1:
The patent converts the potentially harmful CO formation pathway into a beneficial approach by using carbonate salts to suppress CO formation at the source, transforming a problem that would require energy-intensive purification into an opportunity for direct production of high-purity hydrogen without additional purification steps
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 method achieves highly pure hydrogen release with minimal CO contamination, suitable for low-temperature fuel cells without the need for additional purification, thereby reducing energy and cost.
Implementation Method 1
Both reactions typically take place in the presence of a catalyst... the catalyst is a heterogenous catalyst, preferably a Pd-based catalyst, such as a Pd/C catalyst or a Pd/TiO2-based catalyst
Implementation Method 2
the oxidation of formate to bicarbonate to release hydrogen... HCOOK + H2O -> H2 + KHCO3
Implementation Method 3
the Pd/TiO2-based catalyst is obtainable by a deposition precipitation method, comprising the steps of: providing a porous support material having a BET surface area of at least 150 m2
Data Source
Figure 1
AI summary
The present invention relates to a method of reversibly storing and releasing hydrogen in a bicarbonate/formate-based aqueous reaction system, wherein the method comprises providing a carbonate salt and adding said carbonate salt to the bicarbonate/formate-based aqueous reaction system.