The catalytic performance and characterization of ZrO 2 support modification on CuO-CeO 2 /TiO 2 catalyst for the simultaneous removal of Hg 0 and NO

Enhancement of catalytic activity in NH3-SCR reaction by promoting dispersibility of CuCe/TiO2-ZrO2 with ultrasonic treatment

“…5 displays FT-IR spectra of various catalysts. In the high wavenumber range, the band is observed at 3438 cm −1 of N–H stretching region, indicating that NH 3 can be adsorbed steadily on Lewis acid sites and Brønsted acid sites [30] . It has been reported that the bands at 1100–1300 cm −1 , 1500–1750 cm −1 are ascribed to NH 3 adsorb on Lewis acid sites, while those at 1340–1560 cm −1 , 1640–1850 cm −1 are assigned to NH 4 + species adsorb on Brønsted acid sites [31] , [32] .…”

“…It means that the increase of copper oxidation state and decrease of cerium oxidation state coexist and encouraged by ultrasonic treatment. There has occurred the synergistic interaction of copper with ceria, which is inferred as follows [26] , [30] : Cu + + Ce 4+ ↔ Cu 2+ + Ce 3+ …”

Bimetallic Fe–Cu-Based Metal–Organic Frameworks as Efficient Adsorbents for Gaseous Elemental Mercury Removal

“…Fitting the Cu 2p 3/2 and Cu 2p 1/2 peaks, it can be seen that the FeCu-MOFs surface includes two valences of Cu (Cu 2+ and Cu + ). 43,44 After the mercury removal experiment, the relative percentage of Cu 2+ on the FeCu-MOF surface is decreased from 73.99 to 67.14%, and the relative content Cu + is increased from 26.01 to 32.86%. The transformation from Cu 2+ to Cu + is accompanied by the conversion from elemental mercury to oxidized mercury.…”

“…For the O 1s spectrum, the peak near the binding energy of 531.7 eV belongs to the lattice oxygen (O α ), while the peak at the binding energy of 533.2 eV belongs to the chemisorbed oxygen (O β ). 44,45 After the mercury removal reaction, the relative percentage of the chemisorbed oxygen decreases from 27.31 to 14.55%, while the relative percentage of lattice oxygen increases from 72.69 to 85.45%. The results show that the chemisorbed oxygen is mainly in the charge of the catalytic oxidation and removal of gaseous Hg 0 .…”

Cr Doping MnOx Adsorbent Significantly Improving Hg0 Removal and SO2 Resistance from Coal-Fired Flue Gas and the Mechanism Investigation

“…In recent years, various technologies for Hg 0 removal have been developed, such as metal oxides catalytic oxidation − and adsorbents injection. − Activated carbon injection is recognized as a useful method for Hg 0 emission in some coal–fired power plants, but high cost and low utilization rate limit its application in power plants. − Metal oxides are supposed to be new alternative materials due to their higher mercury removal efficiency and lower application cost. − …”