[1]固旭,李东,蒋金龙,等.Pd/C中Pd粒径调控及对多氯硝基苯的催化还原影响[J].南京理工大学学报(自然科学版),2010,(06):838-842.
 GU Xu,LI Dong,JIANG Jin-long,et al.Pd Particles Size-control of Pd/C and Its Effect on Catalytic Reduction of Polychloronitrobenzene[J].Journal of Nanjing University of Science and Technology,2010,(06):838-842.
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Pd/C中Pd粒径调控及对多氯硝基苯的催化还原影响
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《南京理工大学学报》(自然科学版)[ISSN:1005-9830/CN:32-1397/N]

卷:
期数:
2010年06期
页码:
838-842
栏目:
出版日期:
2010-12-31

文章信息/Info

Title:
Pd Particles Size-control of Pd/C and Its Effect on Catalytic Reduction of Polychloronitrobenzene
作者:
固旭;李东;蒋金龙;刘晓勤;
南京工业大学化学化工学院
Author(s):
GU Xu12LI Dong2JIANG Jin-long2LIU Xiao-qin1
1.College of Chemistry and Chemical Engineering,Nanjing University of Technology,Nanjing 210009,China;2.Faculty of Life Science and Chemical Engineering,Huaiyin Institute of Technology,Huaian 223003,China
关键词:
活性炭 多氯硝基苯 催化还原
Keywords:
charcoal palladium polychloronitrobenzene catalytic reduction
分类号:
TQ246.1
摘要:
为控制多氯硝基苯加氢制备多氯苯胺的深度脱氯,在Pd/C催化剂制备中,考察了硝酸浓度、催化剂还原温度和时间对催化剂上Pd粒径及催化加氢活性和选择性的影响。结果表明:Pd粒径的增大导致催化剂对多氯硝基苯的催化活性下降,但多氯苯胺的选择性上升;随着硝酸浓度的增加,Pd的分散性和粒径先增大后减少,而还原温度和时间的增加可增大Pd的粒径;采用15%硝酸处理、200~250℃下氢气还原4~5 h可获得较理想的Pd粒径为16~20 nm的Pd/C催化剂;对五氯硝基苯加氢还原呈现较高的加氢活性和选择性,转化率可达99%以上,五氯苯胺选择性可达96%以上。
Abstract:
To control the excessive dechlorination of polychloronitrobenzene hydrogenation to produce polychloroaniline,the effects of nitric acid concentration,catalyst reduction temperature and time in the preparation of Pd/C catalyst on the Pd particle size and catalytic hydrogenation activity and selectivity are investigated.The results indicate that the Pd/C catalytic activity decreases as the Pd particle sizes increase,and the catalyst selectivity goes up;the dispersion and particle sizes of Pd go up first and then down with the increase of nitric acid concentration;the elevated reduction temperature and time yields larger Pd particles;the optimal Pd catalyst with the particle sizes from 16 to 20 nm can be prepared on 15% nitric acid by reduction under hydrogen atmosphere at 200~250 ℃ for 4~5 h;the catalyst shows relatively high hydrogenation activity and selectivity in the hydrogenation reduction of polychloronitrobenzene;the yield can reach more than 99% and the selectivity for pentachloroaniline can reach above 96%.

参考文献/References:

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备注/Memo

备注/Memo:
基金项目: 江苏省科技攻关项目( BE2004386)作者简介: 固旭( 1963- ), 男, 博士生, 副教授, 主要研究方向: 有机合成, E-m ail:guxu@ hy it. edu. cn; 通讯作者: 刘晓勤( 1958- ), 女, 教授, 博士生导师, 主要研究方向: 吸附分离与工业催化, E-m a il:L iuxq@ n jut. edu. cn。
更新日期/Last Update: 2012-11-02