CuO-CeO2/Nb2O5 Composite Catalysts for 150°C CO Conversion
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Solution Overview
Problem
Existing CO oxidation catalysts face issues of high cost, scarcity, rapid deactivation, and instability due to CO2 and H2O exposure, necessitating the development of cost-effective, stable, and highly active catalysts for low-temperature CO conversion.
Innovation Solution
A catalyst composed of CuO, CeO2, and Nb2O5, synthesized via wet impregnation, exhibits synergistic interactions creating oxygen vacancies and active sites, enabling efficient CO oxidation at 150°C with low activation energy (21.3 kJ mol−1) and stability over 12 hours.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If noble metal catalysts (Au, Pt, Rh, Pd) are used for CO oxidation, then high catalytic activity is achieved, but high cost and scarcity limit widespread application
Solution Approach 1:
The patent replaces expensive noble metal catalysts with non-noble metal oxide catalysts (CuO-CeO2/Nb2O5) that are abundant and cost-effective. While non-noble catalysts may have shorter operational lifetimes individually, the system achieves long-term effectiveness through catalyst regeneration capabilities and resistance to deactivation by CO2 and H2O, making them economically viable for widespread application
Solution Approach 2:
The patent employs a composite catalyst system combining CuO, CeO2, and Nb2O5 in specific ratios. This composite structure synergistically combines the advantages of each component: CuO provides catalytic activity, CeO2 enhances stability and oxygen storage capacity, and Nb2O5 improves resistance to deactivation. The composite material achieves noble-metal-level performance at a fraction of the cost
2Ease of manufacture
If non-noble metal catalysts (Co, Ni, Mn, Fe oxides) are used for CO oxidation, then cost-effectiveness is improved, but instability under CO2 and H2O exposure causes rapid deactivation
Solution Approach 1:
The patent creates a composite catalyst system where CuO-CeO2 is supported on Nb2O5. The Nb2O5 support provides structural stability and resistance to deactivation by CO2 and H2O, while the CuO-CeO2 active phase maintains high catalytic activity. This composite architecture protects the non-noble metal components from degradation, enabling long-term stable operation
Solution Approach 2:
The CeO2 component acts as an intermediary that enhances the stability of the non-noble metal catalyst. CeO2's oxygen storage capacity and redox properties allow it to buffer against deactivation by CO2 and H2O, protecting the CuO active sites while maintaining catalytic function. This intermediary role enables non-noble metals to achieve noble-metal-level stability
3Productivity
If CO oxidation is performed at high temperatures, then complete conversion is achieved, but energy consumption increases and catalyst deactivation accelerates
Solution Approach 1:
The patent modifies the catalytic system's properties through controlled synthesis parameters, creating a catalyst with optimized surface area, pore structure, and active site distribution. The CuO-CeO2/Nb2O5 composite is prepared with specific CuO (1-10 wt%) and CeO2 (1-20 wt%) loadings on Nb2O5 support, achieving maximum CO conversion at low temperatures (below 200°C) while minimizing energy input and preventing thermal deactivation
4Use of energy by moving object
If CO oxidation is performed at low temperatures, then energy consumption is reduced, but catalytic activity is insufficient for complete CO conversion
Solution Approach 1:
The CuO-CeO2/Nb2O5 composite catalyst combines multiple functional components that work synergistically at low temperatures. CuO provides the primary catalytic sites for CO oxidation, CeO2 enhances oxygen availability and stabilizes the structure, and Nb2O5 provides thermal stability and resistance to deactivation. This composite enables complete CO conversion at temperatures below 200°C, achieving high productivity with low energy input
Solution Approach 2:
The patent creates localized active sites with optimized properties within the catalyst structure. The CuO-CeO2 interfaces and surface oxygen species are strategically positioned to maximize CO oxidation activity at low temperatures. The hierarchical pore structure and surface morphology are engineered to concentrate reactants at active sites, enabling efficient low-temperature conversion without requiring high bulk temperatures
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 catalyst achieves complete CO oxidation at low temperatures with high stability and durability, offering a cost-effective alternative to noble metals, suitable for industrial applications in catalytic converters.
Implementation Method 1
a catalyst for oxidation of carbon monoxide (CO) to carbon dioxide (CO2) comprising: Copper oxide (CuO); Cerium oxide (CeO2); and Niobium oxide (Nb2O5)
Implementation Method 2
oxidation of carbon monoxide (CO) to carbon dioxide (CO2)
Data Source
AI summary
There is disclosed a highly efficient and economical catalyst for carbon monoxide (CO) oxidation at low temperatures, using a non-noble transition metal composition of copper oxide (CuO), cerium oxide (CeO2), and niobium oxide (Nb2O5). The catalyst, designated as 10CuCeNb, is synthesized via the wet impregnation method and is composed of with 10% CuO—CeO2 supported on Nb2O5. It shows a significantly improved performance with full CO conversion achieved at relatively low temperature of 150° C. It demonstrates high stability over a 12-hour reaction time. The activation energy (Ea) is 23.1 kJ mol−1, supporting low-temperature CO oxidation with minimal energy input. The catalyst's high activity and stability are attributed to the formation of oxygen vacancies and active Lewis acid sites generated from the synergistic interaction between CuO, CeO2, and Nb2O5. This catalyst offers a cost-effective alternative to noble metal catalysts for use in catalytic converters, effectively reducing CO emissions in industrial and environmental applications.