Lignite Char Supported Nano-Cobalt Catalyst for Low-Temperature CO2 Methanation
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Solution Overview
Problem
Current CO2 methanation catalysts face deactivation due to reactions between active metals and oxide supports, requiring high temperatures and pressures, which are energy-intensive and costly, and lack efficient low-temperature catalysts, especially for cobalt-based systems.
Innovation Solution
A lignite char supported nano-cobalt composite catalyst is prepared through a modified impregnation method followed by high-temperature pyrolysis, providing a hierarchical pore structure, high surface area, and controlled nano-cobalt loading, avoiding deactivation and reducing preparation costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If oxide supported catalysts are used for CO2 methanation, then catalytic activity can be achieved, but catalyst deactivation occurs due to reactions between active metals and oxide supports
Solution Approach 1:
The patent uses lignite char, a porous carbon material, as a support for cobalt nanoparticles. The porous structure provides high surface area for catalyst dispersion while the carbon support is chemically inert and does not react with cobalt metal, preventing the formation of inactive spinel compounds that occur with oxide supports like Al2O3.
Solution Approach 2:
The patent creates a composite catalyst system combining cobalt nanoparticles with lignite char support. This composite structure leverages the catalytic activity of cobalt while utilizing the chemical stability and porous structure of carbonized lignite to prevent deactivation and maintain long-term catalyst performance.
2Productivity
If high temperature and pressure conditions are applied, then CO2 conversion and CH4 selectivity improve, but energy consumption increases and catalyst deactivation accelerates
Solution Approach 1:
The patent changes the support material from traditional oxides to carbonized lignite, which fundamentally alters the reaction conditions. The new support enables CO2 methanation to proceed at lower temperatures and pressures while maintaining high conversion rates, thereby reducing energy consumption and preventing thermal deactivation of the catalyst.
Solution Approach 2:
The patent uses lignite, a low-cost and abundant biomass resource, as the catalyst support. This replaces expensive noble metal catalysts and enables the use of cheaper cobalt-based catalysts that would otherwise require harsh conditions. The economical approach allows for more frequent catalyst replacement or regeneration without significant cost penalty.
3Reliability
If noble metal catalysts are used, then catalytic activity and CH4 selectivity are excellent, but preparation cost increases significantly
Solution Approach 1:
The patent replaces expensive noble metal catalysts (Ru, Rh) with cobalt-based catalysts supported on carbonized lignite. Cobalt is abundant and much cheaper than noble metals. The lignite support is also a low-cost biomass material, making the overall catalyst preparation economically viable for large-scale industrial application.
Solution Approach 2:
The porous structure of carbonized lignite provides high surface area that allows efficient dispersion of cobalt nanoparticles, maximizing their catalytic activity. This compensates for the lower intrinsic activity of cobalt compared to noble metals, enabling cost-effective catalysis with high performance.
4Ease of manufacture
If transition metal catalysts are used, then preparation cost decreases, but reaction temperature must be increased over 350°C
Solution Approach 1:
The patent changes the support material to carbonized lignite, which fundamentally alters the reaction conditions. This modification enables transition metal catalysts to operate at lower temperatures while maintaining cost-effectiveness, eliminating the need for high-temperature operation that causes deactivation and energy waste.
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 catalytic activity for CO2 methanation at low temperatures, conserving energy and reducing greenhouse emissions, while being cost-effective and suitable for industrial application.
Implementation Method 1
CO2 is a carbon source, which can be converted into various useful chemical raw materials and fuels (including CH4, CO, CH3OH, HCOOH, etc.) by CO2 hydrogenation. Hydrogenation of CO2 to methane (CH4) is one of the most promising CO2 conversion technologies
Implementation Method 2
adding a cobalt precursor and the lignite particles into a solvent and mixing, subjecting the lignite particles to an impregnating, and drying the resulting mixture after the impregnating
Implementation Method 3
subjecting the solid substance A to a high-temperature pyrolysis treatment to obtain a lignite char supported nano-cobalt composite catalyst
Data Source
AI summary
The present disclosure provides a lignite char supported nano-cobalt composite catalyst and a preparation method thereof. In the method, lignite is used as a raw material, and a lignite char supported high dispersion nano-cobalt composite catalyst is obtained by a modified impregnation method followed by a high temperature pyrolysis process. The composite catalyst prepared by the present disclosure has a hierarchical pore structure, a high specific surface area, and uniformly dispersing nano-sized cobalts on the lignite char with controllable particle size, so that the obtained catalyst has an excellent catalytic activity for low-temperature CO2 methanation; moreover, the preparation process is simple and feasible, the raw materials used are cheap and easily available. Therefore, the composite catalyst is very suitable for industrial production and application.