Zeolite Support Channels for CO Shift Catalyst Stability
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Solution Overview
Problem
Existing CO shift and reverse shift catalysts face issues with catalytic activity decline and short lifespan due to aggregation and carbon deposition, leading to increased resource consumption and reduced efficiency in coal gasification combined power generation, particularly in high-temperature environments.
Innovation Solution
A structured catalyst with a porous zeolite-type compound support and embedded metal nanoparticles, where the catalyst is housed within the channels of the support, preventing aggregation and maintaining catalytic activity over a long period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If CO shift catalyst particles are exposed to high temperatures for a long period of time, then the CO shift reaction can proceed, but aggregation (sintering) of the CO shift catalyst particles and the support components occurs, causing catalytic activity to decrease and catalyst life to become shorter
Solution Approach 1:
The catalytic particles are embedded within the channels of the porous support structure, creating a nested configuration where the catalyst is housed inside the support matrix. This nesting prevents direct contact between catalyst particles, thereby suppressing aggregation and sintering during high-temperature operation while maintaining catalytic activity
Solution Approach 2:
The invention utilizes a porous support structure with channels that accommodate the catalytic particles. The porous architecture provides physical separation and confinement of catalyst particles, preventing their aggregation during high-temperature reactions while allowing reactant and product molecules to diffuse through the structure
2Productivity
If CO shift catalyst is used to convert CO to CO2, then CO2 can be recovered, but the CO shift reaction increases the temperature of the CO shift catalyst, leading to aggregation and reduced catalyst life
Solution Approach 1:
The catalytic particles are nested within the porous support channels, which provides physical confinement that prevents particle aggregation during the exothermic CO shift reaction. This nesting structure maintains catalyst dispersion and activity over extended operational periods, enabling sustained CO2 recovery efficiency
Solution Approach 2:
The invention creates a composite catalyst system combining catalytic particles with a porous support material. This composite structure leverages the support's thermal stability and porous architecture to protect the catalyst particles from sintering while maintaining the catalytic function for CO conversion
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 structured catalyst exhibits high catalytic activity and heat resistance, extending its lifespan and reducing resource consumption, particularly beneficial for reverse shift reactions in high-temperature conditions.
Implementation Method 1
converted to CO2 using a CO shift catalyst by the CO shift reaction represented by Formula (1)
Implementation Method 2
performed reverse shift reaction using hydrogen and carbon dioxide, and producing a synthetic gas from the generated carbon monoxide and the unreacted portion of hydrogen
Data Source
AI summary
Provided are a structured catalyst for CO shift or reverse shift that can realize a long life time by suppressing the decline in function, a method for producing the same, a CO shift or reverse shift reactor, a method for producing carbon dioxide and hydrogen, and a method for producing carbon monoxide and water. The structured catalyst for CO shift or reverse shift (1) includes a support (10) of a porous structure composed of a zeolite-type compound, and at least one CO shift or reverse shift catalytic substance (20) present in the support (10), the support (10) has channels (11) connecting with each other, and the CO shift or reverse shift catalytic substance (20) is present at least in the channels (11) of the support (10).