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Catalytic Reactor: Hydrogenation of Ethylene08:56

Catalytic Reactor: Hydrogenation of Ethylene

31.4K
Source: Kerry M. Dooley and Michael G. Benton, Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA
The hydrogenation of ethylene (C2H4) to ethane (C2H6) has often been studied as a model reduction reaction in characterizing new metal catalysts.1-2 While supported nickel is not the most active metal catalyst for this reaction, it is active enough that reaction can take place at < 200°C.
The reaction typically involves adsorbed, dissociated hydrogen (H2)...
31.4K
Reduction of Alkenes: Catalytic Hydrogenation02:13

Reduction of Alkenes: Catalytic Hydrogenation

13.9K
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...
13.9K
Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production08:40

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production

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Here, we present a protocol to synthesize Co nanoparticles supported on carbon nanotubes with Co- and N- dopants for hydrogen...
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Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation01:28

Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation

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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...
5.7K
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

3.8K
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...
3.8K
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

9.0K
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 Catalytic Reactor and Hydrogenation of Ethylene
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Heterogeneous Catalytic Reactor and Hydrogenation of Ethylene

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Hydrogenated Borophene Shows Catalytic Activity as Solid Acid.

Asahi Fujino1, Shin-Ichi Ito1,2, Taiga Goto1

  • 1Graduate School of Pure and Applied Sciences, Department of Materials Science, Faculty of Pure and Applied Sciences, and Tsukuba Research Center for Energy Materials Science, University of Tsukuba, 1-1-1, Tennodai, Tsukuba, Ibaraki 305-8573, Japan.

ACS Omega
|September 10, 2019
PubMed
Summary
This summary is machine-generated.

Hydrogen boride (HB) sheets catalyze ethanol reforming into ethylene and water above 493 K. These novel 2D materials function as efficient solid-acid catalysts, showing high selectivity in this chemical conversion.

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Area of Science:

  • Materials Science
  • Catalysis
  • Surface Chemistry

Background:

  • Hydrogen boride (HB) sheets, a novel 2D material composed of boron and hydrogen.
  • Limited experimental data exists on the catalytic properties of HB sheets.

Purpose of the Study:

  • To experimentally investigate the catalytic activity of HB sheets in ethanol reforming.
  • To determine the reaction conditions, selectivity, and activation energy for this process.

Main Methods:

  • Utilized HB sheets as a catalyst for ethanol reforming.
  • Analyzed the reaction products and determined selectivity and apparent activation energy.
  • Conducted experiments at temperatures above 493 K.

Main Results:

  • HB sheets effectively catalyze the conversion of ethanol to ethylene and water.
  • The reaction proceeds with high selectivity and is independent of contact time.
  • The apparent activation energy was determined to be 102.8 ± 5.5 kJ/mol.

Conclusions:

  • HB sheets exhibit significant catalytic activity for ethanol reforming.
  • The material functions as a solid-acid catalyst.
  • These findings open new avenues for using HB sheets in catalytic applications.