CO Shift Catalyst Using TiO2-SiO2 Support for Carbon Deposition Resistance
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Solution Overview
Problem
The existing Co—Mo/Al2O3 catalyst used in CO shift reactions is prone to carbon deposition at high temperatures, requiring excessive water vapor to prevent degradation, which negatively impacts the efficiency and durability of CO shift conversion in integrated coal gasification combined cycle (IGCC) plants aiming to reduce CO2 emissions and improve power generation efficiency.
Innovation Solution
A CO shift catalyst is developed using a complex oxide support with titanium and silicon, incorporating molybdenum or iron as the main component and nickel or ruthenium as an accessory component, fired at high temperatures to create an anatase crystal structure, allowing stable CO shift conversion even with reduced water vapor levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a Co—Mo/Al2O3 catalyst is used at high temperature, then CO shift conversion can be achieved, but carbon deposition occurs causing catalyst deterioration
Solution Approach 1:
The invention changes the chemical composition parameters of the catalyst by replacing part or all of Al2O3 with TiO2 and SiO2, and by optimizing the ratio of Mo to Ni/Ru. This compositional parameter change enables the catalyst to maintain high CO shift conversion activity while resisting carbon deposition at high temperatures, thus resolving the contradiction between productivity and reliability
Solution Approach 2:
The invention uses a composite catalyst material combining TiO2, SiO2, Mo, Ni, and Ru in specific ratios. This composite structure leverages the synergistic effects of different materials: TiO2 and SiO2 provide structural stability and resistance to carbon deposition, while Mo, Ni, and Ru provide catalytic activity for CO shift conversion. The composite material approach simultaneously achieves high conversion rate and catalyst durability
2Reliability
If excessive water vapor is added to prevent carbon deposition, then catalyst durability is improved, but plant power generation efficiency decreases
Solution Approach 1:
The invention extracts the function of preventing carbon deposition from the water vapor and transfers it to the catalyst itself. By designing a carbon-resistant catalyst composition (TiO2-SiO2-Mo-Ni-Ru), the catalyst inherently resists carbon deposition without requiring excessive water vapor, thus eliminating the energy loss associated with adding excess water vapor while maintaining catalyst durability
3Loss of energy
If water vapor supply is reduced to improve power generation efficiency, then energy loss is decreased, but carbon deposition increases causing catalyst deterioration
Solution Approach 1:
The invention changes the catalyst composition parameters to include TiO2, SiO2, Mo, Ni, and Ru in optimized ratios. This parameter change makes the catalyst inherently resistant to carbon deposition, allowing operation with reduced water vapor supply. The catalyst maintains its structural integrity and catalytic activity even under low water vapor conditions, thus achieving both improved power generation efficiency and maintained catalyst durability
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 maintains excellent durability and CO shift reaction stability over a long period, even with reduced water vapor, preventing carbon deposition and enhancing power generation efficiency in IGCC plants.
Implementation Method 1
CO+H2O⇔CO2+H2+40.9 kJ/mol (exothermic reaction)
Implementation Method 2
firing them to obtain the CO shift catalyst at a high temperature from 550° C. to 800° C. to obtain a crystal structure of an anatase type
Data Source
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.