催化学报

催化学报 ›› 2013, Vol. 34 ›› Issue (10): 1945-1950.DOI: 10.1016/S1872-2067(12)60696-2

• 研究论文 • 上一篇    下一篇

催化氧化处理工业废气中高浓度甲醛

魏日出a,b, 陈洪林b, 张小明b, 索继栓b   

  1. a 中国科学院大学, 北京100049;
    b 中国科学院成都有机化学研究所, 四川成都610041
  • 收稿日期:2013-05-24 修回日期:2013-08-16 出版日期:2013-09-29 发布日期:2013-09-29

Removal of high concentrations of formaldehyde in industrial exhaust by catalytic oxidation

Richu Weia,b, Honglin Chenb, Xiaoming Zhangb, Jishuan Suob   

  1. a University of Chinese Academy of Sciences, Beijing 100049, China;
    b Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, Sichuan, China
  • Received:2013-05-24 Revised:2013-08-16 Online:2013-09-29 Published:2013-09-29
  • Contact: Xiaoming Zhang

PDF

1155

摘要：

制备了用于温和条件下催化氧化去除工业废气中高浓度甲醛(HCHO)的1%Pt-4%CeO2/AC催化剂. 将高浓度甲醛的催化氧化过程与双甘膦氧化制备草甘膦的反应过程集成在一起,使草甘膦合成过程中产生和排放出来的甲醛(100-300 mg/m3)在通过催化剂床层时被完全除去. 系统研究了温度、空速和甲醛含量对甲醛去除率的影响. 在气体空速(GHSV)低于20000 h-1时废气中几乎所有的甲醛都被氧化,处理后的废气中的甲醛含量低于0.1 mg/m3,甲醛的转化率为99.1%-100%. 当GHSV为30000- h-1,催化剂床层温度为12℃时,生产废气通过催化剂床层后的甲醛含量小于1.5 mg/m3,甲醛的转化率为97.56%-99.99%. 1%Pt-4%CeO2/AC催化剂的中试试验结果表明,处理后最终尾气中甲醛含量小于10 mg/m3,有效地防止了甲醛对人们健康的危害,具有良好的产业化前景.

关键词: 铂-二氧化铈/活性炭催化剂, 甲醛废气, 草甘膦生产, 甲醛去除

Abstract:

A Pt-CeO2/AC catalyst was developed for the removal of high concentrations of formaldehyde (HCHO) in industrial exhaust under mild conditions. The HCHO removal was integrated into a N-(phosphonomethyl)glycine production process to remove in situ the high concentrations of HCHO in its exhaust stream. The HCHO produced and emitted (100-300 mg/m3) in N-(phosphonomethyl)glycine synthesis was completely removed by passage through the catalyst bed. The effects of temperature, space velocity, and HCHO content on removal efficiency were systematically studied. Almost all the HCHO was oxidized at gas hourly space velocities (GHSV) below 20000 h-1, and the HCHO content was decreased to below 0.1 mg/m3, that is, the HCHO conversion rate was 99.10%-100%. When the GHSV was in the range of 30000-50000 h-1 and the catalyst bed temperature was 12 ℃, the HCHO content in the treated gas was still less than 1.5 mg/m3, and the HCHO conversion rate was 97.56%-99.99%. The 1%Pt-4%CeO2/AC catalyst is now in the pilot phase of its use in treating glyphosphate production exhaust gas containing high concentrations of HCHO, and good initial progress has been made. The concentrations of HCHO in the treated industrial exhaust were less than 10 mg/m3, which effectively has no HCHO health hazard, and there are good prospects for industrialization.

Key words: Platinum-ceria/activated carbon catalyst, Formaldehyde waste gas, Glyphosphate production, Formaldehyde removal