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化工学报  2015 

Zn、Cd化合物对模拟飞灰中二噁英生成的影响

DOI: 10.11949/j.issn.0438-1157.20150034, PP. 2643-2648

Keywords: 模拟飞灰,金属化合物,二噁英,从头合成,催化效果

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Abstract:

催化剂是二噁英(PCDD/Fs)从头合成的关键因素,但已有研究仍不足。在实验室条件下利用模拟飞灰(MFA)研究不同金属催化剂对PCDD/Fs生成量及分布的影响。结果表明,ZnO抑制PCDD/Fs的生成,ZnCl2对PCDD/Fs生成催化作用远大于CdCl2,生成PCDD/Fs浓度分别为431.78、6.32ng·g-1。ZnCl2催化下生成PCDD/Fs浓度是ZnO的338倍,CdCl2催化下生成PCDD/Fs浓度是CdO的3倍。Zn、Cd化合物催化下生成PCDD/Fs氯化程度低。利用主成分分析(PCA)研究催化剂对PCDD/Fs分布的影响,结果表明不同金属催化剂作用下,17种有毒PCDD/Fs分布变化显著。同时ZnCl2催化下,反应气氛中氧含量的提高导致PCDD/Fs生成量增加,但是对PCDD/Fs分布的影响有限。

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