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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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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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用于强氧化的伪Pt单层

Tonghui Zhao1, Mengting Li2, Dongdong Xiao3

  • 1Key Laboratory of Material Chemistry for Energy Conversion and Storage (Ministry of Education), Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan430074, China.

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PubMed
概括
此摘要是机器生成的。

与标准Pt/C催化剂相比,一种新的假形Pt原子层 (PmPt) 催化剂在IrPd核矩阵上显示出显著增强的性氧化反应活性和稳定性.

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科学领域:

  • 材料科学
  • 电化学
  • 催化剂

背景情况:

  • 异质皮质的核心外结构为先进的催化应用提供了协同效益.
  • 开发高效和稳定的催化剂对于氧化反应在性介质中至关重要.

研究的目的:

  • 在IrPd核心矩阵 (PmPt@IrPd/C) 上以表层增长的伪形Pt原子层 (PmPt) 的合成和特征.
  • 评估 PmPt@IrPd/C 催化剂对氧化反应的催化性能和稳定性.
  • 调查增强活动和稳定的基本机制.

主要方法:

  • 在IrPd-核心/碳支上伪形Pt原子层的长轴生长.
  • 在性电解质中测试氧化反应 (HOR) 活性和耐久性.
  • 经过5万个周期的加速稳定性测试.
  • 阳离子交换膜燃料电池 (AEMFC) 的性能评估.

主要成果:

  • 在性HOR中,PmPt@IrPd/C比基准Pt/C大约增加了29. 2倍.
  • 在5万个周期的稳定性测试后,催化剂的活性增加了25.0倍.
  • 增强的稳定性归因于耐碳腐蚀和调节的吸附.
  • 使用PmPt@IrPd/C的超低Pt负荷 (0.009 mgPt cm-2) 的AEMFC实现了1.27W cm-2的功率密度.

结论:

  • PmPt@IrPd/C核心外催化剂代表了性氧化催化学的重大进步.
  • 这种新的结构提供了卓越的活性,稳定性和燃料电池中利用率的降低.
  • 这些发现为开发下一代用于清洁能源的催化剂铺平了道路.