Effect of calcium precursors on pelletized property and cyclic CO₂ capture performance

¹ Department of Chemical Engineering, Faculty of Engineering, King Mongkut’s University of Technology North Bangkok, Bangkok 10800, Thailand
² Department of Chemical Engineering, Faculty of Engineering and Industrial Technology, Silpakorn University, Nakhon Pathom 73000, Thailand
³ The Joint Graduate School of Energy and Environment, King Mongkut’s University of Technology Thonburi, Bangkok 10140, Thailand
⁴ Center of Excellence in Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand

^* Worapon Kiatkittipong: kiatkittipong_w@su.ac.th

Abstract

CaO is widely used for capturing CO₂ in large scale application however the work on the manufacture of CaO based pellets for the application of CO₂ capture is relatively limited. In this research investigated the effect of calcium precursors (Ca(OH)₂, Ca(NO₃)₂ and Ca(CH₃COO)₂) and their synthesis method (sol-mixing and wet-mixing) on pelletization. Adsorbent synthesized from Ca(CH₃COO)₂ as a precursor using sol-mixing pelletize to porous spherical provide the best mechanical strength and CO₂ adsorption capacity 0.51 and 0.41 g CO₂/ g CaO at first cycle and tenth cycle respectively. The outstanding cyclic performance of Ca(CH₃COO)₂ sol-mixing can be ascribed to the presence of inert support material i.e. Ca₉Al₆O₁₈ and Ca₁₂Al₁₄O₃₃ with suitable pore volume to prevent sintering of CaO and structure collapsing at high temperature.