Surface Modified Metallic Foam for Raney Catalyst Separation
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Solution Overview
Problem
Raney catalysts in powder form require time-consuming and costly separation from reaction media, and their high bulk density leads to low activity per weight of catalytically active metal, making them inefficient for continuous and batch processes.
Innovation Solution
A surface modified metallic foam body is created by applying a leachable metallic compound onto a metallic foam, forming an alloy skin, and then treating it with a leaching agent to increase surface area and control the catalytic properties, allowing for efficient use in chemical reactions and easy separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Raney catalysts are used in powder form, then catalytic activity is achieved, but separation from reaction medium becomes time-consuming and costly
Solution Approach 1:
The patent applies porous ceramic materials as catalyst supports, which provide high surface area for catalytic activity while maintaining a fixed structure that enables easy separation from reaction media. The porous structure allows reactants to access active sites while the rigid framework prevents catalyst particles from dispersing in the liquid phase.
Solution Approach 2:
The invention extracts the catalytic function from loose powder form and immobilizes it onto a solid support structure. This separation of catalytic activity from free-floating particles allows the catalyst to remain fixed in the reactor while enabling continuous operation without frequent separation steps.
2Productivity
If Raney catalysts are used in powder form, then catalytic function is provided, but bulk density is high leading to low activity per weight
Solution Approach 1:
The patent utilizes porous ceramic supports with controlled pore structures that provide extremely high surface area to volume ratios. This allows a given weight of catalyst to distribute active sites over a much larger surface area, dramatically increasing catalytic activity per unit weight compared to dense powder forms.
Solution Approach 2:
The invention transitions from zero-dimensional powder particles to three-dimensional porous structures with hierarchical pore networks. This dimensional transformation creates internal surface areas that are orders of magnitude larger than external surfaces, enabling high catalytic activity within a compact, low-density form factor.
3Productivity
If alloy skin is formed on metallic foam body, then catalytic properties are enhanced, but manufacturing complexity increases
Solution Approach 1:
The patent forms the alloy skin on the metallic foam body before the final catalyst activation step. This preliminary alloy formation creates a controlled interface structure that simplifies subsequent leaching operations and ensures uniform catalyst distribution, reducing the complexity of later manufacturing steps.
Solution Approach 2:
The invention creates a composite structure combining metallic foam with an alloy skin layer. This composite approach integrates the mechanical stability of the foam core with the catalytic functionality of the alloy surface, achieving enhanced performance while using a systematic, multi-material fabrication process.
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 surface modified metallic foam body offers a highly controllable and efficient catalyst with increased surface area, improved mechanical stability, and enhanced catalytic activity, facilitating easy separation and optimized performance in chemical reactions.
Implementation Method 1
treating it with a leaching agent to increase surface area and control the catalytic properties
Implementation Method 2
forming an alloy skin of the metallic foam body obtained in step (b) by alloying the first metallic material and the second metallic material
Implementation Method 3
a surface modified metallic foam body, obtainable by a process comprising: (a) providing a metallic foam body
Data Source
AI summary
The invention relates to a surface modified metallic foam body, obtainable by a process comprising the steps: (a) providing a metallic foam body comprising a first metallic material; (b) applying a second metallic material which is different from the first metallic material and which contains a first metallic compound that is leachable as such and/or that can be transformed by alloying into a second metallic compound that is leachable and different from the first metallic compound on a surface of the metallic foam body; (c) forming an alloy skin of the metallic foam body obtained in step (b) by alloying the first metallic material and the second metallic material; and (d) treating the alloyed metallic foam body obtained in step (c) with an agent that is capable of leaching out the leachable first and/or second metallic compound from the alloy skin of the metallic foam body. The invention moreover relates to a process for the production of the surface modified metallic foam body and a use of the surface modified metallic foam body.