High-Temperature Fired CO Shift Catalyst Reduces Carbon Deposition
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Solution Overview
Problem
Existing CO shift catalysts, such as Co-Mo/Al2O3, are prone to carbon deposition at high temperatures, requiring excessive water vapor to prevent degradation, which reduces power generation efficiency in IGCC plants due to high water vapor consumption.
Innovation Solution
A CO shift catalyst produced by firing a complex oxide support with molybdenum or iron as the main component and nickel or ruthenium as an accessory component at high temperatures (550°C to 850°C), reducing carbon deposition and maintaining stability even with reduced water vapor supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional CO shift catalyst (e.g., Co-Mo/Al2O3) is used at high temperature, then CO conversion activity is maintained, but carbon deposition occurs causing catalyst deterioration
Solution Approach 1:
The invention changes the firing temperature parameter from conventional low temperatures (500-600°C) to high temperatures (700-850°C). This parameter change transforms the catalyst structure to be more resistant to carbon deposition while maintaining CO conversion activity, thereby resolving the contradiction between durability and carbon deposition
Solution Approach 2:
The invention uses a composite oxide support containing multiple metal oxides (e.g., TiO2, ZrO2, CeO2, Al2O3) in specific combinations. This composite structure provides both high-temperature stability and resistance to carbon deposition, solving the durability issue without excessive carbon formation
2Reliability
If excessive water vapor is added to prevent carbon deposition, then catalyst stability is improved, but power generation efficiency decreases due to high water vapor consumption
Solution Approach 1:
The invention converts the harmful effect of high-temperature operation (which normally causes carbon deposition) into a benefit by designing a catalyst that is specifically activated and stabilized at high temperatures. The high firing temperature creates a catalyst structure that is inherently resistant to carbon deposition, eliminating the need for excessive water vapor addition and thus resolving the energy loss issue
3Loss of energy
If water vapor addition is reduced to improve power generation efficiency, then energy loss is decreased, but catalyst deterioration accelerates due to insufficient carbon deposition prevention
Solution Approach 1:
The invention changes multiple parameters simultaneously: firing temperature (to 700-850°C), support composition (composite oxides with specific ratios), and metal component selection. These combined parameter changes create a catalyst that maintains durability even with reduced water vapor addition, as the high-temperature fired structure is inherently more resistant to degradation and carbon deposition
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 exhibits excellent durability and maintains stable CO shift reaction performance for a long time, allowing for efficient CO conversion with reduced water vapor, thereby improving power generation efficiency and reducing carbon deposition.
Implementation Method 1
firing the complex oxide and the active ingredient at a high temperature equal to or higher than 550°C and equal to or lower than 850°C
Implementation Method 2
CO + H 2 O ⇔ CO 2 + H 2 + 40.9kJ/mol (exothermic reaction)
Data Source
Figure 1
Figure 2
AI summary
A CO shift catalyst according to the present invention reforms carbon monoxide (CO) in gas. The CO shift catalyst has one of molybdenum (Mo) or iron (Fe) as a main component and has an active ingredient having one of nickel (Ni) or ruthenium (Ru) as an accessory component and one or two or more kinds of oxides from among titanium (Ti), zirconium (Zr), and cerium (Ce) for supporting the active ingredient as a support. The temperature at the time of manufacturing and firing the catalyst is equal to or higher than 550°C.