A Novel Effective Approach for Synergistic No Reduction During the Carbonationprocess by Biomass-Modified Calcium-Based Sorbents

A novel effective method to realize the synergistic NO reduction during thecarbonation step by biomass-modified calcium-based sorbents is proposed. Coconutshell, a waste from the coconut industry, and calcined limestone were used as biomasssources and calcium sources, respectively. The volatile released and the continuouspyrolysis of biochar thereafter from the biomass – modified sorbents improved themicrostructure of sorbents. Biomass in the modified sorbents played an important rolein NO reduction, both homogeneous and heterogeneous contributing to the reactionduring the carbonation process. CaO in the sorbents showed a catalytic effect onpromoting both NO-biochar and NO-CO reactions during the simultaneous CO 2 /NOremoval process. The easy blocking of active sites by carbonation products wasalleviated by sorbents modified with biomass. The continuously improvedmicrostructure of sorbents and the exposure of active sites during the process enabledthe effective CO 2 capture as well as the synergic stable reduction of NO