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

化工学报 ›› 2015, Vol. 66 ›› Issue (7): 2643-2648.DOI: 10.11949/j.issn.0438-1157.20150034

Zn、Cd 化合物对模拟飞灰中二噁英生成的影响

廖钧红, 杨杰, 孟炜杰, 李晓东, 陈彤

浙江大学能源清洁利用国家重点实验室, 浙江杭州 310027

收稿日期:2015-01-09 修回日期:2015-04-08 出版日期:2015-07-05 发布日期:2015-07-05
通讯作者: 李晓东
基金资助:
国家重点基础研究发展计划项目(2011CB201500)。

Effect of Zn, Cd compounds on formation of dioxins in model fly ash

LIAO Junhong, YANG Jie, MENG Weijie, LI Xiaodong, CHEN Tong

State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, Zhejiang, China

Received:2015-01-09 Revised:2015-04-08 Online:2015-07-05 Published:2015-07-05
Supported by:
supported by the National Basic Research Program of China (2011CB201500).

摘要/Abstract

摘要：

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、6.32 ng·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。

关键词: 模拟飞灰, 金属化合物, 二噁英, 从头合成, 催化效果

Abstract:

Catalyst is the key factor for formation of dioxins i.e. PCDD/Fs, for which there is not enough study currently. In this paper, the effect of different metal catalyst contained in model fly ash (MFA) on both PCDD/Fs concentration and distribution is studied under laboratory conditions. The results show that ZnO can inhibit the formation of PCDD/Fs. The catalytic effect of ZnCl₂ on PCDD/Fs is far more obvious than that of CdCl₂ and the concentrations of PCDD/Fs obtained are 341.78 and 16.32 ng·g^-1, respectively. PCDD/Fs formed by ZnCl₂ promotion is 338 times as many as that of ZnO, while the concentration of PCDD/Fs catalyzed by CdCl₂ is twice more than that of CdO. Principal component analysis (PCA) is used to research the effect of catalyst on PCDD/Fs distribution. It is observed that the change of distribution for 17 toxic PCDD/Fs catalyzed by different metal catalyst is significant. Meanwhile, the PCDD/Fs concentration rises with increase of O₂ content, but for PCDD/Fs distribution it has only limit influence.

Key words: MFA, metallic compound, PCDD/Fs, de novo synthesis, catalytic effect

中图分类号:

TK229

廖钧红, 杨杰, 孟炜杰, 李晓东, 陈彤. Zn、Cd 化合物对模拟飞灰中二噁英生成的影响[J]. 化工学报, 2015, 66(7): 2643-2648.

LIAO Junhong, YANG Jie, MENG Weijie, LI Xiaodong, CHEN Tong. Effect of Zn, Cd compounds on formation of dioxins in model fly ash[J]. CIESC Journal, 2015, 66(7): 2643-2648.

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Zn、Cd 化合物对模拟飞灰中二噁英生成的影响

Effect of Zn, Cd compounds on formation of dioxins in model fly ash

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