Results 291 to 300 of about 1,489,717 (314)

Of Hydrogen

2004
H. Döpp, D. Döpp
  +6 more sources

Hydrogen complexes in hydrogenated silicon

Physica B: Condensed Matter, 1991
Experimental evidence suggests that H bonds to a fully coordinated Si network in pairs. The total energies and vibration frequencies of various possible pair configurations are calculated using a local density pseudopotential method on supercells. The H * 2 configuration, consisting of a bond centered H and a H located at an adjacent antibonding site,
Shengbai Zhang, Warren B. Jackson
openaire   +2 more sources

The Hydrogen Issue

ChemSusChem, 2010
AbstractHydrogen is often proposed as the fuel of the future, but the transformation from the present fossil fuel economy to a hydrogen economy will need the solution of numerous complex scientific and technological issues, which will require several decades to be accomplished.
Armaroli, Nicola, Balzani, Vincenzo
openaire   +5 more sources

Hydrogenation of polyaromatics in the presence of hydrogen-hydrogen sulphide system

Fuel, 1989
Abstract Thermal production of hydroaromatics by addition of molecular hydrogen to polyaromatics was studied in the presence of hydrogen sulphide or tetralin. The results indicate the importance of wall catalytic effects related to H 2 H 2 S activity during fossil fuel treatment.
B. Fixari, P. Le Perchec
openaire   +2 more sources

Hydrogenation by hydrogen bronzes I. Hydrogenation of ethylene by HxMoO3

Journal of Catalysis, 1982
Abstract Hydrogenation of ethylene has been studied on hydrogen molybdenum oxide bronzes prepared by spillover of hydrogen from supported Pt particles. The temperature of the formation and of the outgassing of the bronze, as well as the Pt content, was found to influence the rate of the reaction of ethylene.
X. Wispenninckx, Georges Poncelet, Jj. Fripiat, Jp. Marcq, D. Keravis   +4 more
openaire   +2 more sources

Of -Hydrogen

2005
M. lvarez, J. A. Joule
  +5 more sources

Hydrogenation by hydrogen bronzes II. Hydrogenation of ethylene by HxV2O5

Journal of Catalysis, 1984
Abstract Hydrogen vanadium oxide bronzes have been prepared by spillover of hydrogen from supported Pt particles. The crystallinity of the starting oxide disappears progressively during the insertion of hydrogen so that a bronze with an initial stoichiometry of about H 3.3 V 2 O 5 is quasi-amorphous.
Jp. Marcq, Jj. Fripiat, Georges Poncelet
openaire   +2 more sources

Photoreduction of hydrogen peroxide by hydrogen

The Journal of Physical Chemistry, 1976
The photoreduction of hydrogen peroxide in water under hydrogen of up to 100 atm pressure has been investigated. The reaction involves a chain mechanism with the quantum efficiency for the disappearance of hydrogen peroxide being strongly dependent upon the concentration of hydrogen peroxide. A maximum quantum efficiency of about 35 mol/einstein occurs
Dennis Postlethwaite, Richard M. Noyes, Richard J. Field   +2 more
openaire   +2 more sources

Theoretical study of silylene insertion into nitrogen-hydrogen, oxygen-hydrogen, fluorine-hydrogen, phosphorus-hydrogen, sulfur-hydrogen, and chlorine-hydrogen bonds

Journal of the American Chemical Society, 1984
Surfaces d'energie potentielle pour les reactions d'insertion du silylene dans NH 3 , H 2 O, HF, PH 3 , H 2 S et ...
Jayaraman Chandrasekhar, Ken Dykema, Krishnan Raghavachari, Mark S. Gordon   +3 more
openaire   +2 more sources

Reactions of Hydrogen Atom with Hydrogen Peroxide

The Journal of Physical Chemistry A, 2007
Rate coefficients are calculated using canonical variational transition state theory with multidimensional tunneling (CVT/SCT) for the reactions H + H2O2 --> H2O + OH (1a) and H + H2O2 --> HO2 + H2 (1b). Reaction barrier heights are determined using two theoretical approaches: (i) comparison of parametrized rate coefficient calculations employing CVT ...
Donald G. Truhlar, Jingjing Zheng, Daniel P. Theis, Benjamin A. Ellingson, Oksana Tishchenko   +4 more
openaire   +3 more sources