[1]李勤华,谈玲华,杭祖圣,等.三氟碘甲烷的合成及机理[J].南京理工大学学报(自然科学版),2011,(06):863-866.
 LI Qin-hua,TAN Ling-hua,HANG Zu-sheng,et al.Synthesis and Mechanism of CF3 I[J].Journal of Nanjing University of Science and Technology,2011,(06):863-866.
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三氟碘甲烷的合成及机理
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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:
2011年06期
页码:
863-866
栏目:
出版日期:
2011-12-31

文章信息/Info

Title:
Synthesis and Mechanism of CF3 I
作者:
李勤华谈玲华12杭祖圣12冒爱琴1潘仁明1
1. 南京理工大学化工学院,江苏南京210094; 2. 南京工程学院材料工程学院,江苏南京211167
Author(s):
LI Qin-hua1TAN Ling-hua12HANG Zu-sheng12MAO Ai-qin1PAN Ren-ming1
1. School of Chemical Engineering,NUST,Nanjing 210094,China;2. Department of Material Engineering,Nanjing Institute of Technology,Nanjing 211167,China
关键词:
三氟碘甲烷 合成 机理 二氟卡宾
Keywords:
trifluoroiodomethane synthesis mechanism difluorocarbene
分类号:
O643. 36; TQ426. 94
摘要:
该文采用气相催化法以三氟甲烷( CHF3) 和碘为原料合成了三氟碘甲烷( CF3 I) 。对产物进行气相色谱-质谱、气相色谱、傅里叶变换红外光谱和分子量等测试,并对使用前后的催化剂进行BET( Brunauer、Emmett 和Teller) 比表面积测试和热重分析。结果表明: 反应生成CF3 I,转化率达到52. 3%,选择性达到56. 2%。催化剂的比表面积和孔体积降低,分别由反应前的776. 8 m2 /g 和0. 38 cm3 /g 下降到反应后的359. 2 m2 /g 和0. 18 cm3 /g。反应后的催化剂在250 ~ 350 ℃之间失重率达到12wt%,说明在反应过程中催化剂表面产生积炭。根据二氟卡宾( CF2) 的歧化机理和催化剂的表面积炭现象,提出了产物CF3 I 和副产物可能的形成机理。
Abstract:
Trifluoroiodomethane( CF3 I) is synthesized via the vapor-phase catalytic method using trifluoromethane(CHF3) and iodine ( I2) . The product is characterized by gas chromatography-massspectrometry,gas chromatography,Fourier transform infrared spectroscopy and molecular weight determination.The catalyst is investigated with the BET( Brunauer,Emmett and Teller) specific surfacearea method and thermogravimetry. The results show that the conversion of CHF3 is 52. 3% and theselectivity of CF3 I is 56. 2%. The BET surface area and the pore volume of catalyst are 776. 8 m2 /gand 0. 38 cm3 /g before the reaction and decrease to 359. 2 m2 /g and 0. 18 cm3 /g after the reaction.The weight loss of the used catalyst reaches 12wt% over the temperature range of 250 ~ 350 ℃,which shows that coke forms in the process of reaction. The possible mechanism of the product andby-products is proposed based on the difluorocarbene( CF2) disproportionate and coke formation.

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备注/Memo

备注/Memo:
基金项目:“十一五”国家科技支撑计划( 2008BAK40B02) ; 江苏省2009 年度普通高校研究生科研创新计划( CX09B_095Z)作者简介: 李勤华( 1979-) ,男,博士生,助理研究员,主要研究方向: 洁净气体灭火剂性能及应用,E-mail: liqinhua7@ hotmail. com。
更新日期/Last Update: 2012-10-25