Cu-CeO2 Catalyst for Low-Temperature CO Oxidation
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Solution Overview
Problem
Current catalysts for preferential oxidation of carbon monoxide (CO) in hydrogen-rich gases, especially for fuel cell applications, often require high temperatures, expensive metals, or are not effective at low temperatures and in the presence of excess hydrogen and water, which limits their practicality and cost-effectiveness.
Innovation Solution
A nanocrystalline Cu-Ce oxide catalyst with a composition of 5-10 wt% CuO and 90-95 wt% CeO2, prepared through a process involving precipitation, stirring, heating, and calcination, is used for preferential oxidation of CO to CO2 at low temperatures (40-100°C) under atmospheric pressure, utilizing a specific gas mixture and space velocity to achieve high conversion without deactivation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If noble metal based catalysts (Pt, Au, Ir) are used for CO oxidation, then high CO conversion is achieved, but cost increases and temperature requirements increase
Solution Approach 1:
The patent replaces expensive noble metal catalysts (Pt, Au, Ir) with a inexpensive base metal oxide catalyst system (Cu-CeO2). The copper-ceria catalyst achieves comparable CO conversion performance to noble metal catalysts but at significantly lower cost, making the catalyst economically viable for industrial applications.
Solution Approach 2:
The patent employs a composite catalyst system combining copper oxide (CuO) with cerium oxide (CeO2). This composite structure leverages the synergistic effects of both materials: CuO provides catalytic activity for CO oxidation while CeO2 enhances stability, provides oxygen storage capacity, and maintains structural integrity at operating temperatures, achieving high performance without requiring expensive noble metals.
2Productivity
If conventional catalysts operate at high temperature, then CO oxidation activity is maintained, but energy consumption increases and electrode longevity in fuel cells is reduced
Solution Approach 1:
The patent modifies the operating temperature parameter from conventional high temperatures (200-400°C) to low temperatures (40-100°C). The Cu-CeO2 catalyst system is specifically designed to maintain high CO oxidation activity at these reduced temperatures, thereby lowering energy consumption and protecting fuel cell electrodes from thermal degradation while achieving complete CO conversion.
3Adaptability or versatility
If catalysts are used in presence of excess hydrogen and water, then fuel cell feed composition is maintained, but catalyst deactivation occurs
Solution Approach 1:
The patent converts the previously harmful effects of excess hydrogen and water into beneficial conditions for the catalyst. The Cu-CeO2 system is designed to tolerate and even perform optimally in the presence of high hydrogen concentrations (simulating actual fuel cell conditions) and water vapor. The cerium oxide component helps manage water formation and prevents copper particle aggregation, transforming what would normally be deactivating factors into acceptable or beneficial operating conditions.
Solution Approach 2:
The catalyst system incorporates cerium oxide as a protective component that prevents copper particle sintering and aggregation before they can occur during operation. The CeO2 matrix provides structural support and oxygen storage capacity that maintains catalyst activity even under harsh conditions with excess hydrogen and water, ensuring long-term stability without deactivation.
4Ease of manufacture
If base metal oxide catalysts are used instead of noble metals, then cost decreases, but CO oxidation activity at low temperature is insufficient
Solution Approach 1:
The patent employs a composite catalyst system combining copper oxide (CuO) with cerium oxide (CeO2). This composite structure leverages the synergistic effects of both materials: CuO provides catalytic activity for CO oxidation while CeO2 enhances stability, provides oxygen storage capacity, and maintains structural integrity at operating temperatures, achieving high performance without requiring expensive noble metals.
Solution Approach 2:
The patent modifies the operating temperature parameter from conventional high temperatures (200-400°C) to low temperatures (40-100°C). The Cu-CeO2 catalyst system is specifically designed to maintain high CO oxidation activity at these reduced temperatures, thereby lowering energy consumption and protecting fuel cell electrodes from thermal degradation while achieving complete CO conversion.
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 process achieves 100% carbon monoxide conversion to carbon dioxide without deactivation for up to 100 hours at low temperatures, is economical, and operates effectively in the presence of excess hydrogen and water, enhancing the longevity of fuel cell electrodes by removing CO efficiently.
Implementation Method 1
Catalytic preferential oxidation of CO (CO-PROX) is one of the most suitable methods of purification of H2 because of high CO conversion to CO2 at low temperature range
Implementation Method 2
The process provides a carbon monoxide conversion of 100% without deactivation till 100 h
Implementation Method 3
a nanosize Cu—Ce oxide catalyst comprises CuO in the range of 5-10 wt % and CeO2 in the range of 95-90 wt %
Data Source
AI summary
The present invention provides a catalyst and a process for the selective oxidation of carbon monoxide (CO) to produce carbon dioxide gas (CO2). The process provides a process which selectively oxidizes CO to CO2 in presence of excess hydrogen. The process provides a selective oxidation of CO to CO2 gas over Cu/CeO2 catalyst between temperature range 40° C. to 90° C. at atmospheric pressure in presence of excess H2, H2O and CO2. The process provides a CO conversion up to 100% without deactivation till 100 h.