Cyclic CO₂ capture performance of carbide slag

ABSTRACT

The carbonate looping process is a promising technology for CO₂ capture. The decay of sorbents reactivity over multiple cycles is an obstacle for realizing the carbonate looping process. In this work, the reactivity and stability of carbide slag for CO₂ capture have been examined. The results show that carbide slag exhibits superior CO₂ capture performance even at severe calcination temperatures in comparison with limestones, shells, pure CaCO₃, and Ca(OH)₂. X-ray diffraction analysis shows that there is mayenite (Ca₁₂Al₁₄O₃₃) formed in the calcination step for carbide slag, which is the main reason for its high stability in the carbonate looping process.

KEYWORDS:

• Calcination
• carbide slag
• carbonate looping process
• carbonation
• CO₂ capture

Additional information

Funding

This work was financially sponsored by the Special Funds for the Scientific Research of State Environmental Protection Public Welfare (201109069) and the National Key Technology R &D Program (2013BAC12B02).