Results 261 to 270 of about 24,483 (311)

Effect of solvent and hydrogen during selective hydrogenation

Tetrahedron Letters, 2001
Abstract Described is the solvent effect for the chemoselective hydrogenation of alkenes having a benzyloxy group (Bn-O-) using a hydrogenation system employing atomic hydrogen permeating through a Pd sheet electrode.
Shojiro Maki, Yasuhiro Harada, Ryo Matsui, Makiko Okawa, Takashi Hirano, Haruki Niwa, Megumi Koizumi, Yoshinori Nishiki, Tsuneto Furuta, Hiroshi Inoue, Chiaki Iwakura   +10 more
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Selection of the hydrogen-sorbing material for hydrogen accumulators

International Journal of Hydrogen Energy, 2016
Abstract The hydrogen accumulation in metal hydrides is the urgent problem of hydrogen power engineering and the demand for metal hydrides as capacitive, safe and convenient in service sources of hydrogen has stimulated the study of hydrogen capacity of multicomponent alloys.
D.V. Schur, M.T. Gabdullin, V.A. Bogolepov, A. Veziroglu, S.Yu. Zaginaichenko, A.F. Savenko, K.A. Meleshevich   +6 more
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Selective Hydrogenation of Dicyclopentadiene

Russian Journal of Applied Chemistry, 2020
The previously developed procedures for preparing dihydrodicyclopentadiene (DHDCPD) and tetrahydrodicyclopentadiene (THDCPD) are considered comprehensively. The performance of traditional dicyclopentadiene (DCPD) hydrogenation catalysts (Raney Ni, Pd/C) is compared to that of catalysts based on Ni or Pd nanoparticles on a polymer matrix.
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Selective hydrogenation of nitroaromatics by ceria nanorods

Nanoscale, 2013
Ceria (CeO2) nanorods with well-defined surface planes can be synthesized and utilized for the hydrogenation of nitroaromatics. The CeO2 nanorods containing a {110} plane can efficiently and selectively catalyse the hydrogenation of nitroaromatics with N2H4 as a reducing agent, while nano-ceria with a {100} or {111} plane shows poor performance for the
Hai-Zhou, Zhu, Yong-Ming, Lu, Feng-Jia, Fan, Shu-Hong, Yu   +3 more
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Selective Hydrogenation by Carbocatalyst: The Role of Radicals

Organic Letters, 2019
The selective hydrogenation of the nitro moiety is a difficult task in the presence of other reducible functional groups such as alkenes or alkynes. We show that the carbon-based (metal-free) catalyst can be used to selectively reduce substituted nitro groups using H2 as a reducing agent, providing a great potential to replace noble-metal catalysts and
Muhammad Sohail Ahmad, Huixin He, Yuta Nishina   +2 more
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Selective Hydrogenation Reactions

2013
Gold catalysts demonstrated high selectivity in hydrogenation of the multifunctional molecules. Selective hydrogenation of succinic anhydride (SAN) over gold catalysts was studied. Gold catalysts demonstrated higher activity and selectivity compared to other studied metals.
Olga A. Simakova, Robert J. Davis, Dmitry Yu. Murzin   +2 more
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The hydrogen-ion selective glass electrode

Talanta, 1975
The properties and mechanism of operation of hydrogen-ion selective glass electrodes are reviewed and a model using information from recent research is presented. In the gel layer of a pH-glass protons or hydronium ions are bound to negative charges in a silicon network cross-linked with bi- or tervalent metal ions.
G, Johansson, B, Karlberg, A, Wikby
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Selectivities in Partial Hydrogenation

Journal of the American Oil Chemists' Society, 2009
They also mention AOCS Official Method Tz 1b-79 to calculate the above selectivities. However, when these selectivity ratios were defined more than 40 years ago, simplifications had to be introduced and assumptions had to be made and it is my impression that nowadays, people are insufficiently aware of these simplifications and assumptions and moreover
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Hydrogen-selective thermoelectric gas sensor

Sensors and Actuators B: Chemical, 2003
Abstract A thermoelectric (TE) hydrogen gas sensor was fabricated by depositing a platinum catalyst thin film on the half surface of nickel oxide thick film. When it was exposed to combustible gas diluted by synthetic air, the catalyst layer converts hydrogen and oxygen effectively to water vapor, and give out heat energy, resulting temperature ...
Shin, Woosuck, Matsumiya, Masahiko, Izu, Noriya, Murayama, Norimitsu   +3 more
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Selective Oxidation of Hydrogen to Hydrogen Peroxide

1992
Abstract The synthesis of hydrogen peroxide (H 2 O 2 ) using H 2 ‐O 2 was studied at temperatures from -10°C to 25°C and pressures from 0.50 MPa to 2.3 MPa. Active catalysts included platinum group metals attached to hydrophobic carbon, supported on a mixture of hydrophobic and hydrophilic materials.
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