Combined Reaction System for NH₃ Decomposition and CO₂ Methanation Using Hydrogen Permeable Membrane Reactor in 1D...

Area of Science:

• Chemical Engineering
• Catalysis
• Membrane Reactors

Background:

• Integrated reaction systems offer enhanced performance through efficient separation.
• Previous work developed a combined ammonia decomposition and CO2 methanation system in a membrane reactor.

Purpose of the Study:

• To optimize the performance of an integrated membrane reactor for ammonia decomposition and CO2 methanation.
• To identify key parameters influencing CO2 conversion and overall system efficiency.

Main Methods:

• Utilized a 1D model simulation (FlexPDE Professional Version 7.21/W64) for validation.
• Investigated various parameters: reactor arrangement, catalyst bed positioning, heat transfer, rate constants, and H2 permeance.
• Performed sensitivity analysis to determine influential factors.

Main Results:

• Optimal configuration: ammonia decomposition on the shell side, CO2 methanation on the tube side.
• Maximized CO2 conversion achieved by shifting the methanation catalyst bed downward by 10 mm.
• Rate constant of ammonia decomposition catalyst and H2 permeance were most critical for CO2 conversion.

Conclusions:

• Reactor configuration and catalyst bed positioning significantly impact system efficiency.
• Improving membrane H2 permeance and ammonia decomposition catalyst activity are priorities for maximizing CO2 conversion.
• The integrated system shows potential for efficient chemical processes.