scholarly journals Hydrogen Liberation from Gaseous 2-Bora-1,3-diazacycloalkanium Cations

2017 ◽  
Vol 121 (41) ◽  
pp. 7910-7916
Author(s):  
Jay-Ar Bendo ◽  
Jonathan Martens ◽  
Giel Berden ◽  
Jos Oomens ◽  
Thomas Hellman Morton
Keyword(s):  
Hydrogen Liberation

H2-Generation from Alcohols by the MOF-Based Noble Metal-Free Photocatalyst Ni/CdS/TiO2@MIL-101

2019 ◽  
Vol 72 (10) ◽  
pp. 842 ◽  
Author(s):  
Dominic Tilgner ◽  
Mara Klarner ◽  
Sebastian Hammon ◽  
Martin Friedrich ◽  
Andreas Verch ◽  
...  
Keyword(s):  
Noble Metal ◽  
Metal Organic Framework ◽  
Multiple Bond ◽  
Bond Formation ◽  
Metal Free ◽  
Fossil Carbon ◽  
Gas Atmosphere ◽  
Metal Organic ◽  
Hydrogen Liberation ◽  
Activation Of Alcohols

The synthesis of important classes of chemical compounds from alcohols helps to conserve Earth’s fossil carbon resources, since alcohols can be obtained from indigestible and abundantly available biomass. The utilisation of visible light for the activation of alcohols permits alcohol-based C–N and C–C bond formation under mild conditions inaccessible with thermally operating hydrogen liberation catalysts. Herein, we report on a noble metal-free photocatalyst able to split alcohols into hydrogen and carbonyl compounds under inert gas atmosphere without the requirement of electron donors, additives, or aqueous reaction media. The reusable photocatalyst mediates C–N multiple bond formation using the oxidation of alcohols and subsequent coupling with amines. The photocatalyst consists of a CdS/TiO2 heterojunction decorated with co-catalytic Ni nanoparticles and is prepared on size-optimised colloidal metal–organic framework (MOF) crystallites.

Impulse character of hydrogen liberation from finished rolled bars at room temperature

1977 ◽  
Vol 13 (1) ◽  
pp. 19-21
Author(s):  
V. M. Tupilko ◽  
V. I. Zaika ◽  
G. M. Kovalev ◽  
T. V. Tupilko
Keyword(s):  
Room Temperature ◽  
Hydrogen Liberation

Hydrogen Liberation from Formic Acid Mediated by Efficient Iridium(III) Catalysts Bearing Pyridine-Carboxamide Ligands

2018 ◽  
Vol 2018 (20-21) ◽  
pp. 2247-2250 ◽  
Author(s):  
Gabriel Menendez Rodriguez ◽  
Chiara Domestici ◽  
Alberto Bucci ◽  
Massimiliano Valentini ◽  
Cristiano Zuccaccia ◽  
...  
Keyword(s):  
Formic Acid ◽  
Hydrogen Liberation

scholarly journals Imperfections in plaster surfaces caused by the release of hydrogen gas of polyvinylsiloxane impression materials

2013 ◽  
Vol 1 (2) ◽  
pp. 98
Author(s):  
Jefferson Ricardo Pereira ◽  
Janaina Salomon Ghizoni ◽  
Paulo Henrique Orlato Rossetti ◽  
Naudy Brodbeck May ◽  
Accácio Lins do Valle
Keyword(s):  
Stainless Steel ◽  
Statistical Analysis ◽  
Plaster Cast ◽  
Hydrogen Gas ◽  
Tukey Test ◽  
Type Iv ◽  
Impression Materials ◽  
Hydrogen Liberation ◽  
Stone Type ◽  
The Ideal

Purpose: The purpose of this study was to evaluate the number of bubbles of hydrogen liberation from different polyvinylsiloxane impression materials. Material and Methods: A metallic stainless steel jig containing six receptacles, like trays, was constructed to accommodate the impression materials. The molds were poured immediately, and at 1 hour, 12 hours and 24 hours in order to evaluate the number of bubbles present in each sample. Each sample was made of improved stone (type IV), totaling 48 samples for each polyvinylsiloxane impression material. After setting, the surface of each sample was inspected under a light microscope at 40x magnification and the number of bubbles was recorded. Results were submitted to statistical analysis by ANOVA and Tukey Test (p=.05). Results: ANOVA test showed statistically significant differences among the polyvinylsiloxane impression materials, as determined by the number of bubbles (p<.05). The Tukey test showed statistically significant differences among the three groups (p<.05). Conclusions: Statistical differences were found between addition silicone with regard to the ideal time to wait for the plaster cast, showing that Aquasil results in fewer bubbles in plaster, followed by the President and Simply Perfect samples.

CO2-based hydrogen storage – hydrogen liberation from methanol/water mixtures and from anhydrous methanol

2018 ◽  
Vol 3 (9) ◽  
Author(s):  
Monica Trincado ◽  
Matthias Vogt
Keyword(s):  
Hydrogen Storage ◽  
Heterogeneous Catalysts ◽  
Biological Systems ◽  
Anhydrous Methanol ◽  
Mild Conditions ◽  
Production Of Hydrogen ◽  
Hydrogen Liberation ◽  
Dehydrogenation Reactions ◽  
Molecular Catalysts ◽  
New Strategies

Abstract New strategies for the reforming of methanol under mild conditions on the basis of heterogeneous and molecular catalysts have raised the hopes and expectations on this fuel. This contribution will focus on the progress achieved in the production of hydrogen from aqueous and anhydrous methanol with molecular and heterogeneous catalysts. The report entails thermal approaches, as well as light-triggered dehydrogenation reactions. A comparison of the efficiency and mechanistic aspects will be made and principles of catalytic pathways operating in biological systems will be also addressed.

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