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Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

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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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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.
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Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
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Amines to Alkenes: Hofmann Elimination01:16

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Alkenes can be obtained from amines via an E2 elimination. The amine is first converted into a good leaving group, such as a quaternary ammonium salt. This is accomplished by treating the amine with an excess of alkyl halide, which results in a halide salt. Next, the halide salt is transformed into a hydroxide salt that functions as a base to enable elimination.
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Highly selective urea electrooxidation coupled with efficient hydrogen evolution.

Guangming Zhan1, Lufa Hu1, Hao Li2

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|July 14, 2024
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Atomically isolated Ni-O-Ti sites enable highly selective electrochemical urea oxidation to nitrogen gas (N2), a key step for sustainable hydrogen production and wastewater treatment. This breakthrough overcomes limitations of previous catalysts, paving the way for efficient decentralized systems.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Sustainable Energy

Background:

  • Electrochemical urea oxidation is a promising route for hydrogen (H2) production and wastewater denitrification.
  • Current methods are hindered by the formation of undesirable byproducts like cyanate or nitrite instead of nitrogen gas (N2).
  • Existing nickel-based electrocatalysts exhibit limited N2 selectivity, often below 55%.

Purpose of the Study:

  • To develop an electrocatalyst for highly selective urea oxidation to N2.
  • To improve hydrogen production efficiency and wastewater treatment.
  • To enable decentralized, solar-powered urine processing.

Main Methods:

  • Fabrication of atomically isolated asymmetric Ni-O-Ti sites on a titanium (Ti) foam anode.
  • Electrochemical characterization of the catalyst's performance in urea oxidation.
  • Coupling the anode with a platinum (Pt) cathode for hydrogen evolution.
  • Integration into a prototype device powered by a silicon (Si) photovoltaic cell.

Main Results:

  • Achieved 99% N2 selectivity in electrochemical urea oxidation, significantly outperforming Ni-O-Ni counterparts.
  • Demonstrated a hydrogen evolution rate of 22.0 mL h⁻¹ at a high current density (213 mA cm⁻²) and potential (1.40 VRHE).
  • The asymmetric Ni-O-Ti sites facilitate urea interaction, preventing C-N bond cleavage and promoting N-N coupling for N2 formation.
  • A functional prototype device demonstrated solar-powered, on-site urine processing and decentralized H2 production.

Conclusions:

  • Atomically isolated asymmetric Ni-O-Ti sites are highly effective for selective urea oxidation to N2.
  • This advancement addresses key limitations in electrochemical urea oxidation for water-energy nexus applications.
  • The developed technology offers a sustainable solution for decentralized hydrogen production and urine treatment.