Application of spinel-type cobalt chromite as a novel catalyst for combustion of chlorinated organic pollutants.
Application of spinel-type cobalt chromite as a novel catalyst for combustion of chlorinated organic pollutants.
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DOI：
10.1021/es001098k
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发表时间：
2001
影响因子：
11.4
通讯作者：
D. C. Kim;S. Ihm
中科院分区：
文献类型：
--
作者：
D. C. Kim;S. Ihm
以三氯乙烯（TCE）为模型反应，研究了不同含铬催化剂对氯代有机污染物催化燃烧的影响。其中尖晶石型钴铬铁矿（CoCr 2 O 4）被证明是一种非常有前途的催化剂，显示出比传统氧化铝负载氧化铬更高的活性和更高的CO2选择性。即使在CoCr_2O_4表面同时观察到Cr_3+和Cr_6+物种，Cr_6+物种在还原环境下也是稳定的。Cr 3 +-Cr 6+对位点的存在和氧化还原处理对活性的影响进行了研究，以解释TCE分解的可能活性位点的性质。CoCr_2O_4具有较高的CO_2选择性，这与其丰富的Cr ~（3+）物种和水煤气变换活性有关。
Various chromium-containing catalysts were tested for the total oxidation of trichloroethylene (TCE) as a model reaction for the catalytic combustion of chlorinated organic pollutants. A spinel-type cobalt chromite (CoCr2O4) among others was proven to be a very promising catalyst showing higher activity and higher CO2 selectivity than traditional alumina supported chromia. Even if both Cr3+ and Cr6+ species were observed on the surface of CoCr2O4, the Cr6+ species was stable under reducing environment. The presence of Cr3+-Cr6+ pair sites and the effect of redox treatments on the activity were investigated to explain the nature of possible active sites for TCE decomposition. Higher selectivity to CO2 of CoCr2O4 was ascribed to the abundance of its Cr3+ species, together with its activity for water gas shift reaction.