Copper-Modified Titania Photocatalyst for Simultaneous CO2 and NO Control
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Solution Overview
Problem
Current methods for controlling nitric oxide (NO) and carbon dioxide (CO2) emissions from combustion systems are energy intensive and lack effective simultaneous control and conversion technologies, particularly in post-combustion streams where impurities like NOx impact CO2 photoreduction processes.
Innovation Solution
A photoreduction system utilizing a titania-based photocatalyst, specifically copper-modified titanium dioxide, is employed to reduce CO2 and NO levels in post-combustion streams, generating nitrous oxide (N2O) through ultraviolet radiation, enabling efficient conversion of NO and CO2 into valuable products like carbon monoxide and N2O.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If current energy intensive NOx control techniques are used, then nitric oxide levels are controlled, but energy consumption increases and carbon dioxide levels are not simultaneously controlled
Solution Approach 1:
The patent combines CO2 and NO control into a single photocatalytic process using titania-based catalysts. The system simultaneously reduces both CO2 to CO and NO to N2O in one reactor, eliminating the need for separate treatment processes and reducing overall energy consumption compared to conventional sequential control methods.
Solution Approach 2:
The titania-based photocatalyst performs multiple functions: it acts as both a CO2 reduction catalyst and a NO reduction catalyst. The same catalyst material and reaction conditions enable simultaneous conversion of both pollutants, making the system universally applicable for dual-pollutant control from a single combustion source.
2Object-generated harmful factors
If separate control methods are used for CO2 and NO, then each pollutant can be controlled individually, but device complexity and process inefficiency increase
Solution Approach 1:
The patent merges CO2 and NO control into a single integrated photocatalytic reactor system. Both pollutants are treated simultaneously in one device using the same titania-based catalyst, eliminating the need for multiple separate control units and reducing overall system complexity.
3Productivity
If photoreduction of CO2 is performed in the presence of NOx impurities, then CO2 conversion can occur, but NOx impurities negatively impact the photoreduction process
Solution Approach 1:
Instead of treating NOx as a harmful impurity that must be removed before CO2 photoreduction, the patent converts the harmful NOx into a beneficial product (N2O). The photocatalytic process simultaneously reduces both CO2 and NO, transforming the interfering impurity into a valuable commodity that can be separated and utilized.
Solution Approach 2:
The patent changes the reaction parameters and catalyst composition to enable simultaneous reduction of CO2 and NO. By using titania-based photocatalysts with specific band gap energies and incorporating dopants, the system achieves favorable CO and N2O production while converting what would normally be interfering impurities into desired products.
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 high nitric oxide conversion (>50%) and nitrous oxide yield (>4%), providing a cost-effective and efficient method for controlling CO2 and NO emissions while producing valuable commodities, thus addressing environmental regulations and industrial needs.
Implementation Method 1
a photoreduction system utilizing a titania-based photocatalyst, specifically copper-modified titanium dioxide, is employed to reduce CO2 and NO levels in post-combustion streams, generating nitrous oxide (N2O) through ultraviolet radiation
Implementation Method 2
Photoreduction of nitric oxide provided by the photocatalyst is used to generate nitrous oxide
Data Source
AI summary
Systems and methods for simultaneous control of carbon dioxide and nitric oxide and generation of nitrous oxide are provided. In particular, the present invention provides systems and methods utilizing a titania-based photocatalyst to simultaneously control carbon dioxide and nitric oxide levels generated by combustion systems. Additionally, photoreduction of nitric oxide provided by the photocatalyst is used to generate nitrous oxide.