期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 172, 期 -, 页码 18-26出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2015.02.006
关键词
Perovskite; Catalytic oxidation; Mg; Ca; VOCs
资金
- National Natural Science Foundation of China [51208458]
- Program for Zhejiang Leading Team of ST Innovation [2013TD07]
Ca2+ and/or Mg2+ modified LaCoO3 perovskites were synthesized via a continuous supercritical water (sc-H2O) route, followed by a suite of heat-treatment processes. Experimental results revealed that the introductions of Ca2+ and Mg2+ had profoundly hindered the crystal growths of La(OH)(3) and Co(OH)(2) crystallites in sc-H2O environment where the extra Mg(OH)(2) had provided a confined platform for their reaction, effectively facilitating the formation of phase pure LaCoO3 perovskite. The synergistic effect as induced by dual-site substitution of Ca2+ and Mg2+ was proven very beneficial for suprafacial oxidation process, which had reduced the apparent activation energy (Ea) of LaCoO3 to only 34 kJ/mol in toluene oxidation. This is comparable to some noble metal catalysts. However, the dual-site substitution had somehow deactivated the intrafacial reaction process as the co-substituted Ca2+ had inhibited the generation of surface lattice oxygen and decreased the reducibility of LaCoO3 perovskite. (C) 2015 Elsevier B.V. All rights reserved.
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