XU Xihua, FEI Zhaoyang, CHEN Xian, et al. CeO2 nanoclusters stabilized in aerogel matrix as catalysts for Cl2 production from HCl oxidation[J]. CIESC Journal, 2015, (9): 3421-3427. DOI: 10.11949/j.issn.0438-1157.20150902.
XU Xihua, FEI Zhaoyang, CHEN Xian, et al. CeO2 nanoclusters stabilized in aerogel matrix as catalysts for Cl2 production from HCl oxidation[J]. CIESC Journal, 2015, (9): 3421-3427. DOI: 10.11949/j.issn.0438-1157.20150902.DOI:
CeO2 nanoclusters inserted into aerogel matrix (CeO2@MxOy
MxOy= SiO2
ZrO2
Al2O3) prepared by a single-step sol-gel method were used as catalysts for recycling Cl2 from HCl oxidation. Due to their remarkable quantum-size effects
the properties of CeO2 nanoclusters were significantly different from crystal phase CeO2. The CeO2 nanoclusters could be completely reduced at the temperature range for reduction of the surface oxygen species of crystal phase CeO2. The unique properties of CeO2 nanoclusters resulted in the high activity of CeO2@MxOy in the process of HCl oxidation reaction. 40CeO2@SiO2 exhibited the highest activity and the STY (space time yield of Cl2) reached to 2.10 g·(g cat)-1·h-1 at 430℃ with VO2/VHCl of 1 and contact time of 0.1598 h. Kinetic studies showed that both O2 and HCl competed for the active sites rendering desorption of surface Cl as the rate-determining step.