Purified hydrogen peroxide gas generation methods and devices
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Solution Overview
Problem
Existing methods for producing purified hydrogen peroxide gas (PHPG) face challenges such as the formation of hydrated forms, high concentrations exceeding safety limits, and inhibition by reactive species in photocatalytic plasmas, which limit its effective production and application in occupied areas.
Innovation Solution
A device comprising an air-permeable substrate with a catalyst coated on its surface, exposed to ultraviolet light, which directs airflow through the substrate to produce non-hydrated PHPG, minimizing contact with degrading species and optimizing airflow to achieve a steady-state concentration of at least 0.005 ppm in a closed air volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If vaporized aqueous solutions of hydrogen peroxide are used, then hydrogen peroxide can be delivered to the environment, but the hydrogen peroxide becomes hydrated and its electrostatic interaction capability is greatly attenuated
Solution Approach 1:
The invention transitions hydrogen peroxide from aqueous liquid phase to gas phase through controlled evaporation and photocatalytic generation, eliminating the hydration shell that forms in liquid solutions. This phase transition allows hydrogen peroxide to exist as non-hydrated gas molecules that retain full electrostatic interaction capability with environmental targets.
Solution Approach 2:
The invention replaces thermal vaporization methods with photocatalytic generation using UV-activated catalysts. This substitution enables direct generation of hydrogen peroxide gas from water and oxygen without requiring heating or phase transition of aqueous solutions, thereby preventing hydration while maintaining production efficiency.
2Productivity
If photocatalytic plasma is used to generate hydrogen peroxide, then hydrogen peroxide can be produced, but reactive species in the plasma inhibit production by destroying hydrogen peroxide
Solution Approach 1:
The invention extracts and eliminates the harmful reactive plasma species from the photocatalytic system while retaining the beneficial hydrogen peroxide generation. By using controlled photocatalysis on solid surfaces rather than generating bulk plasma, the system removes ozone and other destructive radicals that would otherwise consume the produced hydrogen peroxide.
Solution Approach 2:
The invention introduces a solid photocatalyst surface as an intermediary between UV light and the water-oxygen mixture. This catalyst mediates the photochemical reaction to produce hydrogen peroxide selectively, avoiding the uncontrolled plasma chemistry that generates destructive reactive species. The catalyst acts as a controlled interface that directs energy toward productive hydrogen peroxide formation.
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 solution effectively produces non-hydrated PHPG, reducing ozone and plasma species, achieving a stable concentration of hydrogen peroxide gas while minimizing degradation, thus enhancing its application in air purification and disinfection.
Implementation Method 1
a catalyst on its surface, exposed to ultraviolet light, which directs airflow through the substrate to produce non-hydrated PHPG
Data Source
AI summary
The present disclosure provides for and includes improved devices and methods for the production of Purified Hydrogen Peroxide Gas (PHPG) that is substantially non-hydrated and substantially free of ozone.