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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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Catalysis02:50

Catalysis

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The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
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Reduction of Alkenes: Catalytic Hydrogenation02:13

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Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
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Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...
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The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
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Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

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Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
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Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction
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用于将二氧化碳化为甲醇的宿主-客多元件催化剂系统中的工程第二球相互作用

Thomas M Rayder1, Adam T Bensalah1, Banruo Li1

  • 1Department of Chemistry, Boston College, Chestnut Hill, Massachusetts 02467, United States.

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概括
此摘要是机器生成的。

这项研究开发了一种新的金属有机框架 (MOF) 催化剂系统,用于高效的二氧化碳化. MOF 的宿主

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科学领域:

  • 催化剂
  • 材料科学
  • 超分子化学

背景情况:

  • 酶使用外层相互作用来提高催化性能.
  • 在合成催化剂中复制这些复杂的相互作用是具有挑战性的.
  • 金属有机框架 (MOF) 为设计先进的催化系统提供了一个平台.

研究的目的:

  • 开发一种模仿酶外界相互作用的合成催化剂系统.
  • 研究宿主与客体相互作用对催化剂反应性和选择性的影响.
  • 使用MOF封装催化剂优化二氧化碳转化为甲醇.

主要方法:

  • 在UiO-66MOF宿主体内封装钉复合物.
  • 使用功能化的UiO-66-X主机探测结构-活动关系.
  • 使用同位素效应和机械实验研究反应机制.
  • 通过测量周转数 (TON) 和周转频率 (TOF) 来评估催化剂的性能.

主要成果:

  • -66MOF宿主,特别是功能组 (UiO-66-NH3+),显著增强了二氧化碳化.
  • 氨基组作为一般的布伦斯特德酸,改善了最初的化步骤.
  • 功能组与封装催化剂的接近对于合作效应至关重要.
  • 当除去水时,观察到活动增加了4倍,突出显示了组的好处.
  • 在二氧化碳化成甲醇方面实现了创纪录的量 (19,000) 和TOF (9100小时-1).

结论:

  • 用MOF封装的催化剂可以有效地利用外层的相互作用来提高反应性.
  • 功能化MOF为催化剂设计和优化提供了一个模块化平台.
  • 该系统具有高效率,可回收性和可用于二氧化碳转化工业应用的潜力.