Analysis of Copper Corrosion by Biogas: Impact of Purification with Activated Carbon and Biochar Derived from Cocoa POSD Waste

Abstract

In the context of reducing greenhouse gas emissions, this study evaluates copper corrosion in contact with biogas before and after purification using different carbons (biochar and activated carbon). Biogas, a renewable energy source, contains impurities such as hydrogen sulfide (H₂S), which accelerate the corrosion of metals, particularly copper. The materials used include carbons derived from cocoa pod waste, subjected to carbonization and chemical activation treatments. The results indicate that biogas purification significantly reduces copper corrosion, with mass loss decreasing from an average of 0.19 g to 0.03 g after 720 hours of exposure. Factorial designs were employed to assess the influence of various factors on the corrosion rate. Activated carbon was found to be 85% effective in removing H₂S, outperforming biochar, which achieved a 72% removal efficiency. In conclusion, using carbons derived from agricultural waste to purify biogas emerges as a promising solution for extending the lifespan of metallic infrastructures, with positive economic and environmental implications.