Preparing natural clay-based catalysts for HCl catalytic oxidation to recycle chlorine

Using cheap and available natural clays (activated clay, bentonite and colin) as supports, CeCuK/activated clay, CeCuK/bentonite and CeCuK/colin catalysts for HCl oxidation were prepared, respectively, and cha- [JP2]racterized by technologies of BET, XRD, Raman, H₂-TPR, ICP and ESEM. Their corresponding catalytic oxidation performances were studied. The experimental results showed that CeCuK/activated clay catalyst had the maximum values of surface area, pore volume and pore diameter, and active component CuO was most dispersed on the support of activated clay. The reducing sequence of catalysts was as follows: CeCuK/activated clay>CeCuK/bentonite>CeCuK/colin. Under conditions of bed temperature 430°C and HCl weight space-time speed 1.53 h^-1, V(HCl):V(O₂)=1:1, the reaction capability of HCl on catalyst CeCuK/activated clay reached 749 L·kg^-1·h^-1.