催化学报 ›› 2009, Vol. 30 ›› Issue (10): 1001-1006.

• 研究论文 • 上一篇    下一篇

载体对负载型金催化剂上甲醛催化氧化的影响

李洪芳, 刘雪松, 郭存霞, 刘统, 罗孟飞, 鲁继青   

  1. 浙江师范大学物理化学研究所, 浙江省固体表面反应化学重点实验室, 浙江金华 321004
  • 收稿日期:2009-10-25 出版日期:2009-10-25 发布日期:2013-06-06

Support Effect on Catalytic Oxidation of Formaldehyde over Supported Gold Catalysts

LI Hongfang, LIU Xuesong, GUO Cunxia, LIU Tong, LUO Mengfei, LU Jiqing*   

  1. Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, Zhejiang, China
  • Received:2009-10-25 Online:2009-10-25 Published:2013-06-06

摘要: 采用沉积-沉淀法和氨水络合法制备了 Al2O3, TiO2, CeO2 和 SiO2 负载的纳米金催化剂, 利用元素分析、X 射线衍射、氮气物理吸附、程序升温还原、透射电镜和拉曼光谱等技术对催化剂进行了表征, 并考察了其低温催化甲醛氧化活性. 结果表明, Au/CeO2 的催化性能最佳, 在 40 oC 时甲醛转化率仍能保持在 80% 以上. 催化剂的活性同时受 Au 的化学状态和载体性质的影响. Au/CeO2 催化剂较高的低温活性可能与离子态的 Au 物种有关, 同时 AuxCe1-xO2-δ 固溶体的形成产生了大量的氧缺位, 提高了氧的活化能力, 也有助于提高催化剂的低温活性.

关键词: 金, 负载型催化剂, 甲醛, 低温氧化, 金-铈固溶体

Abstract: Au catalysts supported on Al2O3, TiO2, CeO2, and SiO2 were tested for HCHO oxidation. The reactivity was influenced by the chemical state of Au and the properties of the supports. The highest activity obtained on the Au/CeO2 catalyst was due to cationic Au species in the catalyst and the formation of AuCeO2 solid solution, by which oxygen vacancies could activate the oxygen species for the reaction.

Key words: gold, supported catalyst, formaldehyde, low temperature oxidation, gold-ceria solid solution