Experimental Study on Optimizing Hydrogen Production from Sludge by Microwave Catalytic Pyrolysis Using Response...

Area of Science:

• Waste Management
• Catalysis
• Renewable Energy

Background:

• Sludge disposal poses environmental challenges.
• Catalytic pyrolysis offers a sustainable method for waste treatment and resource recovery.
• Hydrogen production from sludge is a key area for renewable energy research.

Purpose of the Study:

• To prepare a bifunctional catalyst from electroplating sludge for microwave-assisted catalytic pyrolysis.
• To investigate the effects of process parameters on hydrogen production from municipal sludge.
• To optimize the catalytic pyrolysis process for maximizing unit hydrogen production (UHP).

Main Methods:

• Preparation of a bifunctional catalyst via carbonization and acid modification of electroplating sludge.
• Characterization of the catalyst using XRD, BET, SEM, XPS, and FTIR.
• Experimental investigation using a conventional-then-microwave pyrolysis method.
• Application of central composite design (CCD) and response surface methodology (RSM) for process optimization.

Main Results:

• The prepared catalyst exhibited favorable surface area and pore structure.
• A second-order polynomial regression model accurately predicted the UHP.
• Conventional pyrolysis temperature, microwave irradiation time, and catalyst addition ratio significantly influenced UHP.
• Optimal conditions yielded a UHP of 13.22 mmol/g, closely matching the predicted value.

Conclusions:

• The developed bifunctional catalyst is effective for sludge pyrolysis.
• The conventional-then-microwave pyrolysis method, optimized with RSM, enhances hydrogen yield.
• This approach presents a viable strategy for sludge valorization and sustainable hydrogen generation.