Abstract
To obtain a new low-cost catalyst that possesses well Hg-0 removal activity in a broad temperature range, a series of Cu-Zr-x/Cl-BC catalysts were synthesized with the application of bio-char which was activated by NH4Cl. CuO-ZrO2 as the active component largely improved Hg-0 removal activity of the catalysts. The catalysts were characterized by SEM-EDX, BET, XRD, H-2-TPR, XPS and FT-IR. When the CuO-ZrO2 loading value was 10%, Cu-Zr-10/Cl-BC reached the best Hg-0 removal efficiency (98.87%) at 120 degrees C and maintained over 80% until 240 degrees C. O-2 was of benefit to Hg-0 removal process especially at high temperature because it could regenerate the lattice oxygen which participated in the removal reaction. In addition, Hg-0 removal was mainly determined by adsorption at low temperature and the function of oxidation increased at high temperature. The characterization results indicated that the superior performance of Cu-Zr-10/Cl-BC might be ascribed to lower crystallinity, stronger redox ability and better texture properties which resulted from the interaction of CuO and ZrO2. The mechanism for Hg-0 removal over Cu-Zr-10/Cl-BC was also proposed on the basis of above studies.