Multi-Channel Co@CM Ceramic Catalytic Membrane for Stable Cobalt Loading
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Solution Overview
Problem
Traditional catalytic membranes have low activity, poor stability, and limited load capacity due to weak bonding between active components and membrane materials, hindering large-scale industrial application.
Innovation Solution
A preparation method for a multi-channel Co@CM ceramic catalytic membrane involving the forced circulation of solutions containing 2-methylimidazole and cobalt nitrate hexahydrate to form ZIF-67 on ceramic membranes, followed by calcination, resulting in a nitrogen-rich composite with evenly distributed active centers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional preparation methods are used to load active components on ceramic membranes, then the membrane structure is maintained, but the load capacity per unit volume is low and bonding is weak
Solution Approach 1:
The invention utilizes multi-channel ceramic membranes with porous structures to increase the surface area and load capacity for active components. The porous channels provide abundant sites for coating catalyst precursors, significantly increasing the quantity of active components per unit volume while maintaining strong bonding through the porous structure.
Solution Approach 2:
The invention creates a composite structure by coating metal organic framework (MOF) precursor on ceramic membrane channels, then converting it to active metal catalyst through calcination. This composite approach combines the structural stability of ceramic membranes with the high catalytic activity of metal catalysts, achieving both high load capacity and strong bonding.
2Reliability
If precious metal catalysts are used, then catalytic activity is improved, but cost increases and metal loss occurs
Solution Approach 1:
The invention replaces expensive precious metal catalysts with non-precious metal catalysts such as cobalt, nickel, or iron based on MOF precursors. These alternative catalysts significantly reduce material cost and eliminate the issue of precious metal loss during reaction processes, while maintaining acceptable catalytic activity for applications like p-nitrophenol hydrogenation.
Solution Approach 2:
The invention changes the material parameter from precious metals to non-precious metals, fundamentally altering the cost and stability characteristics of the catalyst system. This substitution maintains catalytic functionality while eliminating the economic and material loss issues associated with precious metals.
3Quantity of substance
If multi-channel ceramic membranes are used, then load capacity per unit volume increases, but preparation complexity increases
Solution Approach 1:
The invention employs a preliminary coating step where MOF precursor is deposited on the ceramic membrane channels before calcination. This preliminary action simplifies the overall process by pre-organizing the catalyst precursor in the desired locations, making subsequent activation easier and more efficient.
Solution Approach 2:
The invention replaces complex mechanical assembly processes with a chemical coating and calcination approach. Instead of mechanically assembling catalyst particles onto the membrane, the precursor is chemically deposited and then thermally converted in situ, significantly simplifying the preparation process despite the multi-channel structure.
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 method enhances catalytic efficiency and stability by increasing active component loading and preventing agglomeration, enabling high catalytic activity and suitability for large-scale industrial use.
Implementation Method 1
filling channels of a multi-channel ceramic membrane tube with the solution A; under an action of a peristaltic pump, forcing the solution A in the channels to flow through membrane pores of the multi-channel ceramic membrane tube... replacing the solution A with the solution B, and iterating the above operation; and conducting at least two cycles of alternate forced circulations of the solution A and the solution B
Implementation Method 2
the calcination is conducted in an argon atmosphere, such that a reductive gas generated from the pyrolysis of an imidazole framework reduces Co2+ in ZIF-67 in situ into catalytically-active Co0
Implementation Method 3
a reductive gas generated from the pyrolysis of an imidazole framework reduces Co2+ in ZIF-67 in situ into catalytically-active Co0
Implementation Method 4
under an action of a peristaltic pump, forcing the solution A in the channels to flow through membrane pores of the multi-channel ceramic membrane tube
Data Source
AI summary
A preparation method of a novel multi-channel Co@CM ceramic catalytic membrane is provided. The catalytic membrane is prepared as follows: a multi-channel ceramic membrane is adopted as a support, and ZIF-67 is assembled layer by layer on a surface and inside pores of the ceramic membrane and then reduced through one-step pyrolysis to produce the catalytic membrane. The preparation method has the following advantages: Nano-scale Co particles are loaded instead of a precious metal on a ceramic membrane, and the surface of the Co particles is wrapped by carbon and nitrogen, which can effectively inhibit the loss of Co particles during a reaction. The prepared Co@CM ceramic membrane has excellent catalytic activity and stability, solves the problem that the traditional catalysts can hardly be separated from products subsequently, and can be widely used in hydrogenation reaction processes.