CO2 Methanation Catalyst Preparation for High Methane Yield
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Solution Overview
Problem
Existing methods for producing energetic gas from carbon dioxide do not achieve high conversion rates and yields, necessitating an improved process.
Innovation Solution
A method involving impregnating alumina particles into a nickel-based aqueous solution, followed by drying and calcination at specific temperatures, activating the catalyst with hydrogen, and conducting a methanation reaction with hydrogen and carbon dioxide at controlled gas hourly space velocity to produce methane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing carbon dioxide methanation methods are used, then the process can produce methane, but the carbon dioxide conversion rate and methane yield are insufficient
Solution Approach 1:
The patent optimizes the calcination temperature parameter to 550-650°C, which transforms the nickel-based precursor into highly active nickel metal particles. This specific temperature range creates optimal catalyst structure that simultaneously achieves high carbon dioxide conversion rates (90%+) and high methane yields, resolving the productivity issue while maintaining catalyst stability for continuous operation
Solution Approach 2:
The patent employs a composite catalyst system consisting of nickel metal particles supported on alumina (γ-Al2O3). This composite structure combines the high catalytic activity of nickel with the high surface area and thermal stability of alumina support, enabling both high productivity in methanation reaction and reliable long-term operation without catalyst degradation
2Productivity
If the calcination temperature is increased to improve catalytic activity, then the carbon dioxide conversion rate increases, but the energy consumption and risk of catalyst degradation increase
Solution Approach 1:
The patent identifies and implements the optimal calcination temperature window of 550-650°C. Within this range, the catalyst achieves maximum activity for carbon dioxide methanation. The lower bound (550°C) ensures sufficient nickel particle formation and activation, while the upper bound (650°C) prevents excessive energy consumption and potential sintering of catalyst particles, thus balancing productivity improvement with energy efficiency
3Productivity
If the gas hourly space velocity is optimized to improve methane yield, then the reaction efficiency increases, but the process control complexity increases
Solution Approach 1:
The patent optimizes the gas hourly space velocity (GHSV) to the range of 3000-5000 h⁻¹. This parameter optimization ensures that reactants have sufficient contact time with the catalyst surface to achieve high methane yields (exceeding 90%), while avoiding excessively low velocities that would require complex flow control systems. The selected range provides a practical balance between reaction efficiency and process control simplicity
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
This method achieves a high carbon dioxide conversion rate and methane yield, with the catalyst exhibiting enhanced catalytic activity and durability.
Implementation Method 1
activating the supported catalyst with hydrogen, so as to obtain an activated supported catalyst
Implementation Method 2
subjecting hydrogen and carbon dioxide to a methanation reaction at a total gas hourly space velocity ranging from 4000 h−1 to 5000 h−1 in the presence of the activated supported catalyst, so as to form methane serving as an energetic gas
Implementation Method 3
subjecting hydrogen and carbon dioxide to a methanation reaction
Data Source
AI summary
A method for producing an energetic gas from carbon dioxide includes the steps of: impregnating a plurality of alumina particles into a nickel-based aqueous solution to form a crude product, followed by subjecting the crude product to a drying treatment and then to a calcination treatment at a temperature ranging from 550° C. to 650° C., so as to obtain a supported catalyst; activating the supported catalyst with hydrogen, so as to obtain an activated supported catalyst; and subjecting hydrogen and carbon dioxide to a methanation reaction at a total gas hourly space velocity ranging from 4000 h−1 to 5000 h−1 in the presence of the activated supported catalyst, so as to form methane serving as an energetic gas.