Highly selective palladium supported catalyst for hydrogenation of phenol in aqueous phase

2011 ◽  
Vol 12 (12) ◽  
pp. 1071-1074 ◽  
Author(s):  
Yolanda Pérez ◽  
Mariano Fajardo ◽  
Avelino Corma
Keyword(s):  
Aqueous Phase ◽  
Supported Catalyst ◽  
Palladium Supported Catalyst

scholarly journals Microemulsion Derived Titania Nanospheres: An Improved Pt Supported Catalyst for Glycerol Aqueous Phase Reforming

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1175
Author(s):  
Andrea Fasolini ◽  
Erica Lombardi ◽  
Tommaso Tabanelli ◽  
Francesco Basile
Keyword(s):  
Aqueous Phase ◽  
High Surface ◽  
High Surface Area ◽  
Supported Catalyst ◽  
Pt Nanoparticles ◽  
Acid Sites ◽  
Glycerol Conversion ◽  
Aqueous Phase Reforming ◽  
Tio2 Support ◽  
Dehydrogenation Reactions

Glycerol aqueous phase reforming (APR) produces hydrogen and interesting compounds at relatively mild temperatures. Among APR catalysts investigated in literature, little attention has been given to Pt supported on TiO2. Therefore, herein we propose an innovative titania support which can be obtained through an optimized microemulsion technique. This procedure provided high surface area titania nanospheres, with a peculiar high density of weak acidic sites. The material was tested in the catalytic glycerol APR after Pt deposition. A mechanism hypothesis was drawn, which evidenced the pathways giving the main products. When compared with a commercial TiO2 support, the synthetized titania provided higher hydrogen selectivity and glycerol conversion thanks to improved catalytic activity and ability to prompt consecutive dehydrogenation reactions. This was correlated to an enhanced cooperation between Pt nanoparticles and the acid sites of the support.

Effect of the Structure of Unsaturated Hydrocarbons and Alcohols on Their Reactivity and Adsorptivity in Hydrogenation

2000 ◽  
Vol 65 (1) ◽  
pp. 9-16 ◽  
Author(s):  
Petr Kačer ◽  
Petr Novák ◽  
Libor Červený
Keyword(s):  
Double Bond ◽  
Supported Catalyst ◽  
Double Bond Position ◽  
Major Effect ◽  
Hydroxyl Group ◽  
Adsorption Parameters ◽  
Unsaturated Hydrocarbons ◽  
Unsaturated Alcohols ◽  
Group Position ◽  
Palladium Supported Catalyst

Competitive hydrogenations of unsaturated hydrocarbons and unsaturated alcohols using a palladium supported catalyst, were studied under atmospheric pressure at 25 °C. From the acquired data and from the hydrogenation of each individual substrate, kinetic and adsorption parameters were determined. It was found that the hydroxyl group position relative to the double bond has no significant effect on the reactivity of the studied unsaturated alcohols; however, it has a major effect on their adsorptivity. Reactivity and adsorptivity of unsaturated hydrocarbons depended on the double bond position in substrates.

Beneficial role of the nitrogen-doped carbon nanotubes in the synthesis of the active palladium supported catalyst

2019 ◽  
Vol 98 ◽  
pp. 107484
Author(s):  
Ekaterina V. Matus ◽  
Arina N. Suboch ◽  
Alexander S. Lisitsyn ◽  
Dmitry A. Svintsitskiy ◽  
Evgeny Modin ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Supported Catalyst ◽  
Nitrogen Doped ◽  
Beneficial Role ◽  
Palladium Supported Catalyst ◽  
Nitrogen Doped Carbon

Aqueous Phase Diffusion in Crystalline Rock

1981 ◽  
Vol 11 ◽  
Author(s):  
M.H. Bradbury ◽  
D. Lever ◽  
D. Kinsey
Keyword(s):  
Radioactive Waste ◽  
Aqueous Phase ◽  
Water Movement ◽  
Degradation Products ◽  
Crystalline Rock ◽  
Crystalline Rocks ◽  
Radionuclide Transport ◽  
Fracture Networks ◽  
Phase Diffusion ◽  
Main Factors

One of the options being considered for the disposal of radioactive waste is deep burial in crystalline rocks such as granite. It is generally recognised that in such rocks groundwater flows mainly through the fracture networks so that these will be the “highways” for the return of radionuclides to the biosphere. The main factors retarding the radionuclide transport have been considered to be the slow water movement in the fissures over the long distances involved together with sorption both in man-made barriers surrounding the waste, and onto rock surfaces and degradation products in the fissures.

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