Plasma Reactor Catalyst for Air Purification Ozone Reduction
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Solution Overview
Problem
Current air purification systems, such as ion enhanced electrostatic filters, face limitations in effectively reducing ozone and NOx levels, and inactivating biological organisms and volatile organic compounds, while also dealing with issues like arcing and charge buildup in electrostatic filters.
Innovation Solution
A plasma reactor system is introduced, featuring a non-thermal plasma chamber with a catalyst, such as manganese dioxide, to enhance the conversion of reactive species, reduce ozone and NOx, and inactivate biological organisms, along with a catalyst electrode to attract charged species and improve VOC destruction, and a catalyst arrangement with spaced blocks and a mixing plate to enhance air interaction with the catalyst.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If ion enhanced electrostatic filters are used to purify air, then particulate filtration is improved, but ozone and NOx reduction is insufficient
Solution Approach 1:
A catalyst (such as manganese dioxide) is introduced as an intermediary substance between the ionizer and the output. This catalyst mediates the chemical transformation of harmful reactive species (ozone and NOx) into less harmful substances, thereby resolving the contradiction between maintaining filtration efficiency and reducing harmful byproducts.
Solution Approach 2:
The chemical parameters of the air stream are changed by introducing a catalyst that facilitates the decomposition of ozone and NOx. The catalyst alters the chemical composition and reactivity of the air stream, transforming harmful species into benign substances while preserving the beneficial filtration effects.
2Reliability
If plasma generators are used to inactivate biological organisms, then biological purification is improved, but charge buildup and arcing occur in electrostatic filters
Solution Approach 1:
The harmful effect of charge buildup is extracted and addressed by introducing a catalyst that facilitates charge neutralization. The catalyst system removes the accumulated charge that would otherwise lead to arcing, while preserving the biological inactivation capability of the plasma generators.
Solution Approach 2:
The harmful charge buildup that causes arcing is converted into a beneficial effect through the catalyst. The catalyst utilizes the charged species to enhance the inactivation of biological organisms while preventing the charge from accumulating to dangerous levels that would cause arcing.
3Object-generated harmful factors
If catalyst is added to reduce reactive species, then ozone and NOx reduction is improved, but device complexity increases
Solution Approach 1:
A porous catalyst structure is employed to maximize the surface area available for catalytic reactions while maintaining a compact form factor. The porous morphology allows efficient contact between the air stream and catalyst material, achieving effective reactive species reduction without requiring a large or complex device structure.
Solution Approach 2:
The catalyst is formulated as a composite material combining manganese dioxide with a porous support structure. This composite approach enhances the catalytic activity and stability while maintaining a simple, integrated component that can be easily incorporated into the existing air purification device architecture.
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 system achieves significant reduction of ozone and NOx levels, improved inactivation of biological organisms, and effective destruction of volatile organic compounds, while preventing arcing and charge buildup, resulting in enhanced air purification efficiency and safety.
Implementation Method 1
subject particulates carried in the fluid stream to a non-thermal (cold) plasma that has a sufficiently high concentration of reactive species to treat at least some of the particulates passing there through
Implementation Method 2
The catalyst is arranged to significantly enhance the conversion of reactive species that are contained in the fluid stream before the stream emerges from the plasma reactor
Implementation Method 3
the catalyst may be arranged to reduce ozone that emerges from the plasma reactor to a level that is below an ambient ozone concentration level
Implementation Method 4
a catalyst electrode to attract charged species and improve VOC destruction
Data Source
AI summary
A variety of reactors that are arranged to treat aerosol particulates that are carried in a fluid stream passing through the reactor is described. In one aspect, the reactor includes a plasma chamber arranged to receive the fluid stream and subject particulates carried in the fluid stream to a cold plasma that has a sufficiently high concentration of reactive species to treat at least some of the particulates passing therethrough. A catalyst is provided downstream of the plasma chamber. The catalyst is arranged to enhance the conversion of reactive species that are contained in the fluid stream before the stream emerges from the reactor. In another aspect, a catalyst electrode is described. The catalyst electrode may include a catalyst material carried on an electrode. A potential may be applied to the electrode during use to attract charged species towards the catalyst. In some embodiments, the catalyst electrode includes a metal frame that serves as the conductive electrode and a catalyst material such as manganese dioxide is applied to the metal frame.