Microtubular Carbon Reactor Assembly for Higher Catalyst Loading
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Solution Overview
Problem
Current microcatalytic reactor systems face complexity in processes such as channel formation, catalyst coating, and joining metal thin films, limiting miniaturization and efficiency due to short channel lengths and restricted catalyst loading, with no reported use of cellulose fiber as a catalyst support.
Innovation Solution
A microcatalytic reactor system utilizing a microtubular honeycomb carbon material produced from heat-treated cellulose fiber, featuring a simple assembly process and enhanced catalyst loading capacity, with a microtubular structure that allows for efficient reaction fuel processing and catalyst coating using capillary force and vapor deposition methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If metal thin film with microchannels is used in conventional microcatalytic reactor systems, then the system can be constructed with defined channels, but the processes become very complicated including channel forming, catalyst coating, calcining, and joining processes
Solution Approach 1:
The patent employs a porous ceramic membrane as the reactor structure, which inherently provides microchannels for reactant flow. This eliminates the need for separate channel forming processes required in metal thin film systems. The porous structure is formed through ceramic processing techniques that integrate channel creation with the base material fabrication, significantly simplifying manufacturing while maintaining defined flow paths.
Solution Approach 2:
The patent creates a composite structure by coating catalyst particles onto the porous ceramic membrane surface. This composite approach combines the structural advantages of ceramic (porosity, thermal stability) with the catalytic functionality of metal particles, eliminating the need for complex metal thin film deposition and joining processes while achieving the same catalytic reactor function.
2Volume of moving object
If metal thin film with short microchannels is used, then the reactor can be miniaturized, but the channel length is limited and catalyst coating amount is restricted
Solution Approach 1:
The porous ceramic membrane provides a three-dimensional network of interconnected pores that serve as channels. This structure allows for significantly longer effective channel lengths within the same reactor volume compared to planar metal thin films. The tortuous path through the porous structure increases the residence time and contact between reactants and catalyst, enhancing reaction efficiency without increasing reactor footprint.
Solution Approach 2:
The patent transitions from the two-dimensional channel structure of metal thin films to a three-dimensional porous network. This dimensional change allows channels to extend in multiple directions simultaneously, increasing the total channel length and catalyst loading capacity within the same external dimensions, thereby improving productivity while maintaining miniaturization.
3Length of moving object
If conventional metal thin film reactor systems are used, then the system can be constructed, but miniaturization is difficult due to process complexity and channel length limitations
Solution Approach 1:
The porous ceramic membrane structure inherently provides long, tortuous channels within its thickness. By controlling the pore size, porosity, and membrane thickness during ceramic fabrication, the patent achieves long effective channel lengths without requiring complex multi-step assembly processes. The channels are formed as an integral part of the membrane structure, not as separate components requiring joining.
4Adaptability or versatility
If forest resources such as cellulose fiber are not used as catalyst support, then conventional materials are used, but there is no reported use of cellulose fiber carbonized at high temperature as catalyst support with microtubular structure
Solution Approach 1:
The patent applies thermal treatment at high temperatures to cellulose fiber, transforming it into a carbonized material with microtubular structure. This parameter change (temperature treatment) converts an organic material into a structurally sophisticated catalyst support with inherent microchannels, achieving both material versatility and manufacturing simplicity through a single thermal processing step.
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 system achieves improved reaction efficiency and miniaturization by leveraging the mesoporous surface of cellulose carbide, enabling applications in small-sized energy systems, fuel cells, VOC treatment, and low-concentration hydrogen systems, with increased catalyst loading and simplified production.
Implementation Method 1
a microtubular reactor module, which is produced by assembling and sealing a reactor frame around a microtubular honeycomb carbon material, obtained by heat-treating cellulose microfiber
Implementation Method 2
an evaporation heater disposed in a region that is part of the transport pipe line such that it vaporizes the reaction fuel supplied to the microtubular reactor module when the reaction fuel is in a liquid state
Implementation Method 3
a very small heater wound such that it can locally heat only the microtubular reactor module
Implementation Method 4
catalyst coating using capillary force and vapor deposition methods
Implementation Method 5
catalyst coating using capillary force and vapor deposition methods
Data Source
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AI summary
Disclosed herein is a microcatalytic reactor system (10) comprising a microtubular reactor module (1) produced using a microtubular honeycomb carbon material (11) obtained by heat-treating cellulose fiber, the microcatalytic reactor system (10) comprising: a microtubular reactor module (1), which is produced by assembling and sealing a reactor frame (15) around a microtubular honeycomb carbon material (11), obtained by heat-treating cellulose microfiber, using an adhesive (14), and serves to allow reaction fuel (6) supplied thereto to catalytically react; a very small heater (2) wound around the microtubular reactor module (1) such that it can locally heat only the microtubular reactor module (1); a transport pipe line (4) connected to the microtubular reactor module (1) such that it supplies reaction fuel (6) and purge gas (61) to the microtubular reactor module (1); an evaporation heater (5) disposed in a region that is part of the transport pipe line (4) such that it vaporizes the reaction fuel (6) supplied to the microtubular reactor module (1) when the reaction fuel (6) is in a liquid state; a control unit (51) for controlling the temperature of the evaporation heater (5); and a quartz reactor (3) for fixing the entire reaction portion of the microtubular reactor module (1).