Porous Catalyst Support for LOHC Dehydrogenation
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Solution Overview
Problem
Current catalysts for dehydrogenation of liquid organic hydrogen carriers (LOHC) suffer from low dispersibility, reduced specific surface area due to metal catalyst aggregation, and physical desorption, leading to low activity and durability, with heat transfer limitations further hindering reaction rates.
Innovation Solution
A catalyst with a support having a pore size of 10 nm or more, utilizing Pt or other noble metals like Ni, Pd, Ru, and Re on supports such as CeO2 or TiO2, prepared through the glycine-nitrate process (GNP) to enhance reaction rate and stability, facilitating mass transfer and heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a noble metal catalyst is impregnated on a carrier surface, then catalytic activity is provided, but metal dispersibility is low and aggregation occurs reducing specific surface area
Solution Approach 1:
The patent employs a porous support material with specifically controlled pore size (10 nm or more) to accommodate large LOHC molecules. The porous structure provides high surface area for metal dispersion while preventing aggregation through appropriate pore size control, thus maintaining both catalytic activity and surface area.
Solution Approach 2:
The patent optimizes the local environment by controlling pore size distribution and metal particle distribution within the porous support. This local optimization ensures adequate metal dispersibility in critical reaction zones while maintaining overall structural stability and activity.
2Quantity of substance
If a catalyst is used for LOHC dehydrogenation, then hydrogen storage capacity is enabled, but heat transfer limitations reduce reaction rate
Solution Approach 1:
The porous support structure with 10 nm or more pore size facilitates heat transfer throughout the catalyst bed by allowing better fluid circulation and reducing thermal resistance. This maintains high reaction rates while enabling hydrogen storage capacity.
Solution Approach 2:
The patent transitions from dense catalyst structures to porous three-dimensional structures, adding dimensional complexity that improves heat transfer pathways while maintaining catalytic function for hydrogen storage.
3Area of stationary object
If a catalyst with small pore size is used, then metal dispersibility is improved, but mass transfer of large LOHC molecules is hindered
Solution Approach 1:
The patent uses porous materials with specifically engineered pore sizes (10 nm or more) that are large enough to accommodate and facilitate the diffusion of large LOHC molecules while still providing sufficient surface area for metal dispersion. This resolves the contradiction between metal dispersibility and mass transfer.
4Productivity
If a catalyst is used for dehydrogenation, then reaction activity is achieved, but physical durability is low due to metal desorption
Solution Approach 1:
The porous support structure provides mechanical anchoring for metal particles through pore walls and surface interactions, preventing metal desorption during reaction cycles. This maintains both reaction activity and physical durability over time.
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 significantly improves dehydrogenation reaction rates by 10 times or more, reduces reactor size and costs, and enhances electric power storage density, overcoming heat transfer limitations and maintaining catalytic activity over time.
Implementation Method 1
carrying out combustion of the mixture obtained from the mixing step
Implementation Method 2
catalyst for dehydrogenation reaction for liquid organic hydrogen carriers (LOHC)
Data Source
AI summary
The present disclosure provides a catalyst for dehydrogenation of liquid organic hydrogen carriers, including: a support; and a catalytically active ingredient on the support, wherein the support has a pore size of 10 nm or more.