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Catalysts
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Feature Papers
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Feature Papers

A special issue of Catalysts (ISSN 2073-4344).

Deadline for manuscript submissions: closed (31 October 2011) | Viewed by 27890

Special Issue Editor

Prof. Dr. Keith Hohn

E-Mail Website
Editor-in-Chief
Carl R. Ice College of Engineering, Kansas State University, Manhattan, KS, USA
Interests: catalysis and reaction engineering; natural gas conversion; oxidative dehydrogenation of light hydrocarbons; millisecond contact time reactors; nanoparticle catalysts; biomass conversion
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Special Issue Information

Dear Colleagues,

This is a collection of top quality papers published free of charge in Open Access form by the editorial board members, or those invited by the editorial office and the Editor-in-Chief. The papers should be long research papers (or review papers) with full and detailed summary of the author's own work done so far.

Prof. Dr. Keith Hohn
Editor-in-Chief

Keywords

  • catalysts feature papers

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Published Papers (2 papers)

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Research

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16 pages, 354 KiB  
Article
Hydrogenation of Anthracene in Supercritical Carbon Dioxide Solvent Using Ni Supported on Hβ-Zeolite Catalyst
by Endalkachew Sahle-Demessie, Venu Gopal Devulapelli and Ashraf Aly Hassan
Catalysts 2012, 2(1), 85-100; https://doi.org/10.3390/catal2010085 - 30 Jan 2012
Cited by 32 | Viewed by 13311
Abstract
Catalytic hydrogenation of anthracene was studied over Ni supported on Hβ-zeolite catalyst under supercritical carbon dioxide (sc-CO2) solvent. Hydrogenation of anthracene in sc-CO2 yielded 100% conversion at 100 °C, which is attributed to the reduced mass transfer limitations, and increased [...] Read more.
Catalytic hydrogenation of anthracene was studied over Ni supported on Hβ-zeolite catalyst under supercritical carbon dioxide (sc-CO2) solvent. Hydrogenation of anthracene in sc-CO2 yielded 100% conversion at 100 °C, which is attributed to the reduced mass transfer limitations, and increased solubility of H2 and substrate in the reaction medium. The total pressure of 7 MPa was found to be optimum for high selectivity of octahydroanthracene (OHA). The conversion and selectivity for OHA increased with an increase in H2 partial pressure, which is attributed to higher concentration of hydrogen atoms at higher H2 pressures. The selectivity reduced the pressure below 7 MPa because of enhanced desorption of the tetrahydro-molecules and intermediates from Ni active sites, due to higher solubility of the surface species in sc-CO2. The selectivity of OHA increased with the increase in catalyst weight and reaction time. The rate of hydrogenation of anthracene was compared with that found for napthalene and phenanthrene. The use of acetonitrile as co-solvent or expanded liquid with CO2 decreased the catalytic activity. Full article
(This article belongs to the Special Issue Feature Papers)
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Review

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32 pages, 514 KiB  
Review
Oxidation Catalysts for Elemental Mercury in Flue Gases—A Review
by Beatrice-Andreea Dranga, Liliana Lazar and Heinz Koeser
Catalysts 2012, 2(1), 139-170; https://doi.org/10.3390/catal2010139 - 13 Feb 2012
Cited by 92 | Viewed by 13933
Abstract
The removal of mercury from flue gases in scrubbers is greatly facilitated if the mercury is present as water-soluble oxidized species. Therefore, increased mercury oxidation upstream of scrubber devices will improve overall mercury removal. For this purpose heterogeneous catalysts have recently attracted a [...] Read more.
The removal of mercury from flue gases in scrubbers is greatly facilitated if the mercury is present as water-soluble oxidized species. Therefore, increased mercury oxidation upstream of scrubber devices will improve overall mercury removal. For this purpose heterogeneous catalysts have recently attracted a great deal of interest. Selective catalytic reduction (SCR), noble metal and transition metal oxide based catalysts have been investigated at both the laboratory and plant scale with this objective. A review article published in 2006 covers the progress in the elemental mercury (Hgel) catalytic oxidation area. This paper brings the review in this area up to date. To this end, 110 papers including several reports and patents are reviewed. For each type of catalyst the possible mechanisms as well as the effect of flue gas components on activity and stability are examined. Advantages and main problems are analyzed. The possible future directions of catalyst development in this environmental research area are outlined. Full article
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