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Reduction of Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

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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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Microbes and Methanogenesis01:26

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Methanogenesis is a critical microbial process in anaerobic ecosystems responsible for the biological production of methane, a potent greenhouse gas and valuable biofuel. This metabolic pathway is primarily facilitated by methanogenic archaea, which thrive in anoxic environments such as wetlands, sediments, and animal gastrointestinal tracts. The absence of oxygen in these habitats prevents aerobic respiration, thereby favoring alternative biochemical pathways for organic matter degradation.In...
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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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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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Hydroboration-Oxidation of Alkenes03:08

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In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
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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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A Simple, Low-cost, and Robust System to Measure the Volume of Hydrogen Evolved by Chemical Reactions with Aqueous Solutions
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Base-free hydrogen generation from methanol using a bi-catalytic system.

Angèle Monney1, Enrico Barsch, Peter Sponholz

  • 1Leibniz-Institut für Katalyse e.V. and der Universität Rostock, Albert-Einstein-Strasse 29a, 18059 Rostock, Germany. matthias.beller@catalysis.de.

Chemical Communications (Cambridge, England)
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Summary

A novel bi-catalytic system efficiently dehydrogenates methanol without a base, producing high-purity hydrogen gas. This system achieves a turnover number over 4200 with minimal carbon monoxide contamination.

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Area of Science:

  • Catalysis
  • Green Chemistry
  • Hydrogen Production

Background:

  • Methanol dehydrogenation is a key process for hydrogen production.
  • Developing efficient and selective catalysts is crucial for sustainable energy solutions.
  • Base-free conditions are desirable to simplify product purification and reduce waste.

Purpose of the Study:

  • To develop a synergistic bi-catalytic system for base-free methanol dehydrogenation.
  • To achieve high catalytic activity and selectivity.
  • To minimize carbon monoxide (CO) formation during the reaction.

Main Methods:

  • Utilized a bi-catalytic system involving Ru-MACHO-BH and Ru(H)2(dppe)2.
  • Investigated the synergistic interaction between the two catalytic components.
  • Performed base-free dehydrogenation of methanol under optimized conditions.

Main Results:

  • Achieved a total turnover number (TON) greater than 4200.
  • Demonstrated high selectivity with minimal carbon monoxide (CO) contamination (<8 ppm).
  • The synergistic interaction between Ru-MACHO-BH and Ru(H)2(dppe)2 was crucial for the system's performance.

Conclusions:

  • The developed bi-catalytic system offers an efficient and selective route for base-free methanol dehydrogenation.
  • This approach significantly reduces CO contamination in the produced hydrogen gas.
  • The findings present a promising advancement in catalytic hydrogen production technologies.