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相关实验视频

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Measurement and Analysis of Atomic Hydrogen and Diatomic Molecular AlO, C2, CN, and TiO Spectra Following Laser-induced Optical Breakdown
09:40

Measurement and Analysis of Atomic Hydrogen and Diatomic Molecular AlO, C2, CN, and TiO Spectra Following Laser-induced Optical Breakdown

Published on: February 14, 2014

在Ti-silicalite中对过氧化活性部位进行光化学和FT-IR探测.

Wenyong Lin1, Heinz Frei

  • 1Physical Biosciences Division, Mailstop Calvin Laboratory, Lawrence Berkeley National Laboratory, University of California, Berkeley, California 94720, USA.

Journal of the American Chemical Society
|August 1, 2002
PubMed
概括

研究人员使用过氧化直接检测到氧化过器中的活性氧化部位. 这种水氧物种 (TiOOH) 有效地氧化了烯酸,标志着对理解催化过程的重大进步.

科学领域:

  • 不同质的催化剂.
  • 材料科学 材料科学 材料科学
  • 频谱学是一种光谱学.

背景情况:

  • 二氧化的石网是氧化反应的关键催化剂.
  • 这些材料中活性部位的确切性质,特别是当充满过氧化时,仍然是难以捉摸的.
  • 了解活性物种是优化催化性能的关键.

研究的目的:

  • 直接检测和描述在将过氧化加载到Ti-silicalite时形成的活性氧化物种.
  • 为了阐明这种物种介导的烯酸氧化机制.
  • 提供第一个活跃地点的直接光谱证据.

主要方法:

  • 将水性过氧化装入Ti 酸盐.
  • 通过疏散去除溶剂.
  • 在现场的里埃变换红外光谱 (FT-IR) 用于检测和监测.
  • 紫外线-Vis光谱学用于研究带到金属电荷转移 (LMCT) 吸收.
  • 以同位素标记 ((18) O) 来确认物种识别.

主要成果:

  • 通过FT-IR光谱学直接检测一种热稳定的水氧物种,分配给TiOOH (eta(2)).
  • 这种TiOOH物种表现出一个特有的OO延伸在837厘米(-1) 和一个宽的OH带在3400厘米(-1).

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Growth and Electrostatic/chemical Properties of Metal/LaAlO3/SrTiO3 Heterostructures
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11:47

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11:54

Growth and Electrostatic/chemical Properties of Metal/LaAlO3/SrTiO3 Heterostructures

Published on: February 8, 2018

  • 这种物种具有光效性,在UV-VIS LMCT激发时转化为醇组,随后再冷凝形成Ti-O-Si链接.
  • TiOOH部分在室温下有效氧化烯 (烯,乙烯),无论是在黑暗中还是在光刺激下.

    • 结论:

    • 水氧物种TiOOH是H(2) O(2) 负荷的Ti-silicalite中的主要活性氧化部位.
    • 这项研究提供了这个重要的催化系统中活性位点的第一个直接光谱证据.
    • 这些发现为反应机制提供了关键的见解,并为催化剂设计改进铺平了道路.