The catalytic performance and characterization of ZrO2 support modification on CuO-CeO2/TiO2 catalyst for the simultaneous removal of Hg0 and NO.

The different addition amounts of ZrO 2 on CuO-CeO 2 /TiO 2 catalyst synthesized by co-precipitation method were investigated to research the simultaneous removal of Hg 0 and NO in simulated flue gas. Results indicated that the CuCe/TiZr 0.15 catalyst exhibited the superior Hg 0 removal efficiency (72.7%) and prominent NO conversion (83.3%). Hg 0 slightly restrained the NO conversion. Except for the effect of the separate NH 3 and NO on Hg 0 removal, significances of the increased NH 3 /NO ratio on Hg 0 removal and NO conversion were detected. The lower GHSV could give rise to the significant acceleration of Hg 0 and NO removal. With the existence of SO 2 and H 2 O, the slightly prohibitive effect on Hg 0 and NO removal was displayed. BET, XRD, SEM, H 2 -TPR, XPS, FTIR analysis were applied to characterize catalysts and the results revealed the ZrO 2 modified support on CuO-CeO 2 /TiO 2 resulted in strong redox ability, great mobility of surface oxygen and growing total amount of chemisorbed oxygen and lattice oxygen, which favorably impacted on Hg 0 and NO removal. The introduction of Zr benefited great surface area, weakened crystallinity of TiO 2 and then improved the dispersion of metal oxide species. More stable Lewis acid sites to form coordinated NH 3 were generated due to ZrO 2 additive . The synergetic effect through redox equilibrium of C e 3 + + C u 2 + ↔ C e 4 + + C u + contributed to Hg 0 removal and NO conversion. In addition, the simultaneous removal of Hg 0 and NO on CuCe/TiZr 0.15 in terms of detailed mechanism was discussed. [ABSTRACT FROM AUTHOR]