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An Experimental Study of a Zeolite Membrane Reactor for Reverse Water Gas Shift
Motomu Sakai1, Kyoka Tanaka2, Masahiko Matsukata1,2,3
1Research Organization for Nano & Life Innovation, Waseda University, 513 Wasedatsurumaki-cho, Shinjuku-ku, Tokyo 162-0041, Japan.
Membranes
|December 23, 2022
Summary
This study demonstrates that a membrane reactor enhances carbon dioxide conversion via the reverse water gas shift (RWGS) reaction. Combining a conventional and membrane reactor further boosts CO yield by preventing reactant loss.
Area of Science:
- Chemical Engineering
- Catalysis
- Carbon Capture and Utilization
Background:
- Reverse water gas shift (RWGS) is a key technology for CO2 conversion.
- Conventional reactors are limited by equilibrium conversion.
- Selective water removal can enhance CO2 conversion.
Purpose of the Study:
- To investigate the effectiveness of membrane reactors for RWGS.
- To improve CO2 conversion beyond equilibrium limits.
- To compare CO yields in conventional and membrane reactor configurations.
Main Methods:
- Development of a conventional plug-flow reactor.
- Design and testing of two types of RWGS membrane reactors using ZSM-5 membranes.
- Comparative analysis of CO yields at 560 K across different reactor setups.
Main Results:
- A membrane reactor (Case 2) increased CO yield by 2-3% compared to a conventional reactor (Case 1).
- A combined conventional and membrane reactor (Case 3) achieved the highest CO yield (29.0% at 560 K).
- Case 3 suppressed H2 and CO2 permeation, preventing reactant loss and maximizing CO yield.
Conclusions:
- Membrane reactors are effective for enhancing RWGS CO2 conversion.
- A hybrid reactor design offers superior performance by preventing reactant leakage.
- This approach significantly improves CO yield and process efficiency for CO2 utilization.
