Segmented Monolithic Catalyst for CO2 Hydrogenation
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Solution Overview
Problem
Existing monolithic catalysts for carbon dioxide hydrogenation reactions suffer from poor activity and stability, low conversion rates, and low product yield, and are rarely used for such reactions due to their limited radial mixing and mass transfer limitations.
Innovation Solution
A monolithic catalyst with a honeycomb ceramic carrier, where the holes are divided into upper and lower segments with different active components, enabling bifunctional catalysis for efficient carbon dioxide or carbon dioxide-enriched syngas conversion, combining reverse water gas shift and synthesis reactions for methanol or methane production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If monolithic catalysts are used for carbon dioxide hydrogenation reaction, then the catalyst structure provides good thermal stability and resistance to chemical corrosion, but the limited radial mixing and almost no mass transfer between adjacent channels result in poor catalyst activity and stability
Solution Approach 1:
The catalyst channel is divided into multiple segments along the flow direction, with each segment containing different active components. This segmentation allows different reactions to occur in different segments while maintaining the monolithic structure's thermal stability. The upper segment contains active components for reverse water gas shift reaction, while the lower segment contains active components for synthesis reaction, enabling bifunctional catalysis within a single monolithic structure.
Solution Approach 2:
Different active components are selectively distributed in different segments of the monolithic catalyst. The upper segment is loaded with active components optimized for reverse water gas shift reaction, while the lower segment is loaded with active components optimized for synthesis reaction. This local differentiation of catalytic functions allows the catalyst to address multiple reaction requirements simultaneously, improving overall productivity while maintaining the structural reliability of the monolithic form.
2Device complexity
If single-function catalysts are used, then the catalyst structure is simple, but the conversion rate of CO2 and product yield are low
Solution Approach 1:
The monolithic catalyst is designed to perform multiple functions simultaneously by incorporating different active components in different segments. The upper segment performs reverse water gas shift reaction while the lower segment performs synthesis reaction, allowing the single catalyst structure to handle multiple reaction steps. This multi-functionality increases the conversion rate of CO2 and improves product yield without requiring multiple separate catalysts, thus maintaining reasonable structural complexity.
3Ease of manufacture
If active components are uniformly distributed throughout the catalyst, then the manufacturing process is simple, but the catalytic stability and product yield are reduced
Solution Approach 1:
The catalyst is segmented into upper and lower portions, with different active components loaded in each segment. This segmentation allows optimization of catalytic stability for specific reactions in specific locations. The upper segment contains active components optimized for reverse water gas shift reaction stability, while the lower segment contains active components optimized for synthesis reaction stability, improving overall catalytic stability despite the added complexity of differential loading.
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 segmented monolithic catalyst achieves high conversion rates, improved catalytic stability, and reduced process costs by optimizing the distribution of active components, enhancing the efficiency of carbon dioxide conversion and product yield.
Implementation Method 1
a monolithic catalyst used for a carbon dioxide hydrogenation reaction for methanation or alcoholation
Implementation Method 2
The carrier not only is useful for carrying the coating and active components, but also provides a suitable fluid channel for a catalytic reaction
Implementation Method 3
the coating also enables the active components of the catalyst to bind effectively and firmly to the carrier, and makes the active components greatly function
Data Source
AI summary
A monolithic catalyst used for a carbon dioxide hydrogenation reaction and a method for preparing the same. The catalyst comprises a carrier, a coating, and active components. The carrier is a honeycomb ceramic. The coating and the active components are separately applied to honeycomb ceramic hole walls from inside to outside. Moreover, each of the honeycomb ceramic holes is divided into an upper segment and a lower segment, and different active components are separately loaded on the two segments. The method for preparing the monolithic catalyst comprises first applying a coating to a honeycomb ceramic by means of impregnation to obtain a coating-containing carrier, and then applying active components to an upper segment and a lower segment of the coating-containing carrier successively by means of impregnation to obtain the monolithic catalyst.