华南理工大学学报(自然科学版) ›› 2010, Vol. 38 ›› Issue (8): 137-141,146.doi: 10.3969/j.issn.1000-565X.2010.08.026

• 环境科学与技术 • 上一篇    下一篇

纳米Pd—Cu/SnO2复合催化还原硝酸盐氮

程建华1,2  胡勇有1,2  吴以保1,2   

  1. 1.华南理工大学 环境科学与工程学院, 广东 广州 510006;2.华南理工大学 工业聚集区污染控制与生态修复教育部重点实验室, 广东 广州 510006
  • 收稿日期:2010-01-07 修回日期:2010-04-11 出版日期:2010-08-25 发布日期:2010-08-25
  • 通信作者: 程建华(1976-),男,博士,讲师,主要从事水处理技术研究. E-mail:jhcheng@scut.edu.cn
  • 作者简介:程建华(1976-),男,博士,讲师,主要从事水处理技术研究.
  • 基金资助:

    国家科技重大专项资助项目(2008ZX07211-005)

Catalytic Reduction of Nitrate Nitrogen by Nano-Sized Bimetallic Pd-Cu/SnO2 Catalyst

Cheng Jian-hua 1.2  Hu Yong-you 1.2  Wu Yi-bao 1.2   

  1. 1. School of Environmental Science and Engineering, South China University of Technology, Guangzhou 510006, Guangdong, China; 2. Key Laboratory of Pollution Control and Ecological Remediation for Industrial Agglomeration Area of the Ministry of Education, South China University of Technology, Guangzhou 510006, Guangdong, China
  • Received:2010-01-07 Revised:2010-04-11 Online:2010-08-25 Published:2010-08-25
  • Contact: 程建华(1976-),男,博士,讲师,主要从事水处理技术研究. E-mail:jhcheng@scut.edu.cn
  • About author:程建华(1976-),男,博士,讲师,主要从事水处理技术研究.
  • Supported by:

    国家科技重大专项资助项目(2008ZX07211-005)

摘要: 采用热分解法制备纳米SnO2,并运用浸渍法制备Pd—Cu负载在SnO2 上的双金属纳米负载型催化剂.对纳米SnO2进行x射线衍射、透射电镜、比表面积分析;以甲酸为还原剂,在常压下考察了纳米Pd.Cu/SnO 2催化还原硝酸盐氮的活性和选择性.结果表明:制备的纳米SnO2 的晶粒粒径为8.9~10.4nm或9.3~10.7nm,颗粒粒径在10.0nm左右。BET比表面积最大为144.9892m2 /g;催化还原硝酸盐氮的Pd—Cu配比为6:1,甲酸的投加量为16.0mmol/L时,硝酸盐氮的去除率为100.00%,催化活性达到0.119mmol/(min·g),总氮的去除率为76.23%,反应的最佳pH值为4.0.

关键词: SnO2 Pd—Cu/SnO2, 甲酸, 硝酸盐氮, 催化还原

Abstract:

Nano-sized SnO2 and bimetallic Pd-Cu/SnO2  catalysts were successfully prepared via the thermal decomposition method and the impreganation method, respectively. Then, the nano-sized SnO2 was characterized by means of XRD, TEM and specific surface area analyzer, etc. , and the catalytic reduction activity and selectivity of the nano-sized Pd-Cu/SnO2  for nitrate nitrogen were analyzed at atmospheric pressure, with formic acid as the reducing agent. The results show that ( 1 ) the prepared nano-sized SnO2 is of a crystalline size of about 8.9 10. 4 nm or 9.3- 10. 7 nm, with a particle size of about 10. 0 nm and a BET specific surface area being up to 144. 9892m2 /g; and that, in the catalytic reduction of nitrate at a Pd-to-Cu ratio of 6:1 and a formic acid dosage of 16. 0mmol/L, nitrate is completely reduced; 76.23% of the total nitrogen is removed; the catalytic activity reaches 0. ll9mmoL/(min· g) ; and the optimal pH value is 4.0

Key words: tin dioxide, Pd-Cu/SnO2, formic acid, nitrate nitrogen, catalytic reduction