Methane Production Apparatus Temperature Control via MOF Adsorption
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Solution Overview
Problem
The methanation reaction for converting carbon dioxide and hydrogen into methane can cause a local increase in temperature, risking catalyst deterioration or reactor damage due to exothermic reactions.
Innovation Solution
A methane production apparatus and method utilizing a metal organic framework containing chromium, copper, or magnesium, along with potassium bicarbonate or carbonate, to store carbon dioxide and supply hydrogen, which helps in controlling temperature by generating methane while suppressing heat increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carbon dioxide and hydrogen are allowed to react in a reactor to produce methane, then methane production efficiency is improved, but local temperature increase occurs causing catalyst deterioration or reactor damage
Solution Approach 1:
The reactor is divided into multiple reaction zones with separate catalyst beds. Each zone conducts the methanation reaction independently, distributing the exothermic heat generation across multiple locations rather than concentrating it in a single zone, thereby preventing local overheating and catalyst deterioration
Solution Approach 2:
Different catalysts with varying activity levels are placed in different reaction zones. The first reaction zone uses a catalyst with lower activity to moderate the reaction rate and heat generation, while subsequent zones use catalysts with progressively higher activity, creating a gradient that controls temperature distribution throughout the reactor
2Speed
If conventional catalysts are used for methanation reaction, then reaction rate is improved, but catalyst deterioration occurs due to high temperature
Solution Approach 1:
The catalytic function is segmented across multiple reaction zones rather than using a single high-activity catalyst. This distribution maintains overall reaction rate while preventing any single catalyst from being exposed to excessive temperatures that would cause deterioration
Solution Approach 2:
The reaction is initiated in a first zone with a lower-activity catalyst that generates moderate heat, creating favorable conditions for subsequent zones. This staged approach allows the system to build up reaction progress gradually, maintaining catalyst durability while achieving the required overall reaction rate
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 solution effectively produces methane while minimizing temperature increases, thereby preventing catalyst degradation and reactor damage, and also reduces energy consumption in carbon dioxide recovery processes.
Implementation Method 1
a metal organic framework containing any one or a plurality of chromium, copper, and magnesium, and storing carbon dioxide
Implementation Method 2
The methanation reaction for converting carbon dioxide and hydrogen into methane is an exothermic reaction
Data Source
AI summary
A methane production apparatus (200) includes: a holding unit (110) configured to hold any one or both of: a metal organic framework containing any one or a plurality of chromium, copper, and magnesium, and storing carbon dioxide; and potassium bicarbonate; and a hydrogen supply unit (140) configured to supply hydrogen to the holding unit (110).