锌/银二元金属体系中五氯吡啶的电催化还原脱氯

化工学报 ›› 2008, Vol. 59 ›› Issue (S1): 55-59.

锌/银二元金属体系中五氯吡啶的电催化还原脱氯

龚金星;徐颖华;马淳安;马昊;祝占根

浙江工业大学绿色化学合成技术国家重点实验室培育基地

出版日期:2008-06-30 发布日期:2008-06-30

Electrical catalytic dechlorination of pentachloropyridine in Zn/Ag bimetallic system

GONG Jinxing;XU Yinghua;MA Chun’an;MA Hao;ZHU Zhangen

Online:2008-06-30 Published:2008-06-30

摘要/Abstract

摘要：

研究了Zn/Ag二元金属体系对五氯吡啶的催化还原脱氯性能。实验考察了初始pH值、催化剂的投加量、反应温度等参数对反应的影响，在此基础上探讨了其脱氯机理。实验结果表明：反应温度为60℃时，单一锌粉能够对五氯吡啶进行还原脱氯生成四氯吡啶，但是收率不高，只有20%左右，在银的催化作用下，四氯吡啶收率得到了很大提高。当反应初始pH控制在弱酸条件下（5左右），硝酸银浓度为10 g·L^-1时，反应3h后四氯吡啶收率可达到60%以上。在Zn/Ag双金属表面，五氯吡啶的脱氯反应符合一级反应，速率常数为0.0097 min^-1。

关键词:

Zn/Ag二元金属, 四氯吡啶, 五氯吡啶, 脱氯

Abstract:

Dechlorination of pentachloropyridine catalyzed by Zn/Ag bimetal particles was studied in this workThe effects of initial pH of the system, amount of catalyst and reaction temperature on the reaction were studiedThe results showed that the zinc powder could be used to reductively dechlorinate pentachloropyridine to tetrachloropyridine with its yield about 20%Under the catalytic effect of silver, the dechlorination efficiency of pentachloropyridine was greatly improvedWhen the initial pH was about 5, the concentration of silver nitrate was 10 g·L^-1, the yield of tetrachloropyridine could be above 60%The reaction took place on the bimetal surface in a first order reaction, and the rate constant was 0.0097 min^-1

Key words:

Zn/Ag二元金属, 四氯吡啶, 五氯吡啶, 脱氯

龚金星, 徐颖华, 马淳安, 马昊, 祝占根. 锌/银二元金属体系中五氯吡啶的电催化还原脱氯 [J]. 化工学报, 2008, 59(S1): 55-59.

GONG Jinxing, XU Yinghua, MA Chun’an, MA Hao, ZHU Zhangen. Electrical catalytic dechlorination of pentachloropyridine in Zn/Ag bimetallic system[J]. CIESC Journal, 2008, 59(S1): 55-59.

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