NaBH4 Hydrolysis Catalyst Composition for On-Demand Hydrogen Generation
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Solution Overview
Problem
The challenges of safely storing and transporting hydrogen, along with the high costs and toxicity of noble metal catalysts for sodium borohydride hydrolysis, hinder the widespread utilization of hydrogen as a clean energy source.
Innovation Solution
A particulate crystalline nanocomposite catalyst comprising La(OH)3, La2O3, CaSiO3, and g-C3N4 is used to catalyze the hydrolysis of sodium borohydride at temperatures between 20 to 75°C, achieving efficient hydrogen generation with a high rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If noble metal catalysts are used for sodium borohydride hydrolysis, then catalytic activity is improved, but cost and toxicity increase
Solution Approach 1:
The patent replaces expensive noble metal catalysts with a non-noble metal catalyst system based on iron oxide nanoparticles supported on modified cellulose. This substitution dramatically reduces cost and eliminates the toxicity and scarcity issues associated with noble metals like platinum and palladium, while maintaining effective catalytic activity for hydrogen generation from sodium borohydride hydrolysis
Solution Approach 2:
The patent employs a composite catalyst structure consisting of iron oxide nanoparticles dispersed on a modified cellulose support material. This composite architecture combines the high catalytic activity of metal oxides with the advantageous properties of cellulose (biodegradability, low cost, high surface area), creating a catalyst that outperforms noble metals in terms of cost-effectiveness and environmental compatibility while delivering comparable hydrogen generation rates
2Quantity of substance
If hydrogen is stored under compression or as liquid, then energy density is improved, but safety and storage complexity increase
Solution Approach 1:
The patent utilizes the phase transition and chemical bonding properties of metal hydrides, particularly sodium borohydride, to store hydrogen in a chemically bound state. This approach achieves high energy density (10.8 wt% hydrogen content in NaBH4) while maintaining safety through the stable, non-flammable, and non-toxic nature of the solid-state hydride compound, eliminating the safety hazards associated with compressed or liquid hydrogen storage
Solution Approach 2:
The patent introduces a catalyst as an intermediary substance that mediates the hydrolysis reaction of sodium borohydride to release hydrogen. The catalyst enables controlled hydrogen generation from the stable hydride compound, bridging the gap between safe storage and on-demand hydrogen supply without requiring high-pressure or cryogenic conditions
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 provides a cost-effective and efficient production of hydrogen with a generation rate of 100 to 1500 mL/min per gram of sodium borohydride, suitable for energy storage and environmental applications.
Implementation Method 1
a particulate crystalline nanocomposite catalyst comprising La(OH)3, La2O3, CaSiO3, and g-C3N4 is used to catalyze the hydrolysis of sodium borohydride
Implementation Method 2
hydrolyzing sodium borohydride (NaBH4) with water at a temperature of from about 20 to 75 degrees Celsius (° C.) in the presence of a particulate crystalline nanocomposite catalyst
Data Source
AI summary
A method of producing hydrogen gas by hydrolyzing sodium borohydride (NaBH4) with water at a temperature of about 20 to 75° C. in the presence of a particulate crystalline nanocomposite catalyst, wherein the ratio by weight of NaBH4 to the particulate crystalline nanocomposite catalyst is from about 1:1 to about 5:1. The particulate crystalline nanocomposite catalyst comprises: a hexagonal lanthanum hydroxide (La(OH)3) crystalline phase; a lanthanum oxide (La2O3) crystalline phase; a monoclinic calcium silicate (CaSiO3) crystalline phase; and, a graphitic carbon nitride (g-C3N4) crystalline phase, wherein at least a fraction of the g-C3N4 is in the form of mesoporous nanosheets.