Fabrication of CaO-Based Sorbents for CO₂ Capture by a Mixing Method

Three types of sorbent were fabricated using various calcium and support precursors via a simple mixing method, in order to develop highly effective, durable, and cheap CaO-based sorbents suitable for CO₂ capture. The sorption performance and morphology of the sorbents were measured in a thermogravimetric analyzer and a scanning electron microscopy, respectively. The experimental results indicate that cement is a promising low-cost support precursor for contributing to the enhancement of cyclic CO₂ sorption capacity, especially when organometallic calcium precursors were used. A sorbent (with 75% CaO content) made from calcium l-lactate hydrate and cement showed the highest CO₂ sorption capacity of 0.36 g of CO₂/g of sorbent and its capacity decreased only slightly after 70 cycles of carbonation and calcination.