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相关概念视频

Heterogeneous Catalysis01:22

Heterogeneous Catalysis

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Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
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Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

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Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
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稳定的无形乔治石作为高活性催化剂的前体

Simon A Kondrat1, Paul J Smith1, Peter P Wells2,3

  • 1Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, UK.

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|February 16, 2016
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概括

超临界抗溶剂沉产生稳定的乔治石,这是先进的铜/催化剂的前体. 这种方法产生低碳酸盐,增强甲醇合成和水气转移反应.

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科学领域:

  • 材料科学
  • 催化剂
  • 矿物学

背景情况:

  • 铜和碳酸如石是甲醇合成和低温水气转移 (LTS) 反应的关键催化剂前体.
  • 目前用于制备这些前体的方法,通常使用碳酸,引入可以毒害催化剂的杂物.

研究的目的:

  • 开发一种具有低含量的铜/碳化合物前体的新合成方法.
  • 研究超临界抗溶剂 (SAS) 沉产生稳定的乔治石及其催化应用的潜力.

主要方法:

  • 使用二氧化碳的超临界抗溶剂 (SAS) 沉来合成铜/碳酸前体.
  • 描述了所产生的矿物阶段,并评估了它们作为催化剂的性能.

主要成果:

  • 成功制备具有显著降低含量的铜/碳化合物前体.
  • 通过SAS合成的稳定的乔治石作为高活性甲醇合成和优质LTS催化剂的前体.
  • 鉴定出地质石作为一个有价值的,以前未被充分利用的前体.

结论:

  • 超临界抗溶剂 (SAS) 沉是一种有效的先进合成方法,用于生产低铜/碳化合物前体.
  • 稳定的乔治石可以合成并用于制造工业应用的高活性催化剂.
  • 这项工作开辟了通过先进材料合成改进已有的工业催化剂的途径.