نتایج جستجو برای: selective oxidation of propane

تعداد نتایج: 21188084  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه رازی - دانشکده علوم 1389

selective desulfurization of thiocarbonyls to carbonyls thioacetalization of aldehydes and ketones a useful reagent system for the dethioacetalization reactions

Journal: :Chemical communications 2012
Neema A Mashayekhi Yi Y Wu Mayfair C Kung Harold H Kung

Au nanoparticles decorated with mononuclear Ti-oxo units dispersed in silica clusters were formed by activating Au nanoparticles (~2 nm) stabilized with Ti- and amine-functionalized siloxane oligomers. These Au nanoparticles were active catalysts for selective oxidation of propane to acetone, and the activity increased with increasing Ti density.

Journal: :Dalton transactions 2015
Steven E Kalman Dominik Munz George C Fortman Nicholas C Boaz John T Groves T Brent Gunnoe

The efficient and selective partial oxidation of light alkanes using potassium periodate and potassium chloride is reported. Yields of methane functionalization in trifluoroacetic acid reach >40% with high selectivity for methyl trifluoroacetate. Periodate and chloride also functionalize ethane and propane in good yields (>20%).

2009
Jared C. Lewis Frances H. Arnold

Efficient catalysts for selective oxidation of C–H bonds using atmospheric oxygen are highly desirable to decrease the economic and environmental costs associated with conventional oxidation processes. We have used methods of directed evolution to generate variants of bacterial cytochrome P450 BM3 that catalyze hydroxylation and epoxidation of a wide range of nonnative substrates. This fatty ac...

2010
Wei Zheng Zhenxing Yu Yuhang Zhang Hongying Fu Xiaoli Zhang Ping Zhang Qiquan Sun Xinguo Hu

The effects of chemical composition and preparation conditions, especially calcination atmosphere, water content and oxygen content on the catalytic performances of MoVTeNbO mixed oxide catalyst system for the selective oxidation of propane to acrylic acid have been investigated and discussed. Among the catalysts studied, the Mo1.0V0.3Te0.23Nb0.12O catalyst calcined in inert atmosphere under a ...

Journal: :Angewandte Chemie 2016
Xuan Li Thomas Lunkenbein Verena Pfeifer Mateusz Jastak Pia Kjaer Nielsen Frank Girgsdies Axel Knop-Gericke Frank Rosowski Robert Schlögl Annette Trunschke

The electronic and structural properties of vanadium-containing phases govern the formation of isolated active sites at the surface of these catalysts for selective alkane oxidation. This concept is not restricted to vanadium oxide. The deliberate use of hydrothermal techniques can turn the typical combustion catalyst manganese oxide into a selective catalyst for oxidative propane dehydrogenati...

Journal: :Chemphyschem : a European journal of chemical physics and physical chemistry 2006
Jurriaan Beckers Lars M van der Zande Gadi Rothenberg

The problem of soot emissions from diesel engines is introduced and the possible solution of combining doped perovskites and microwave (mw) irradiation to "clean up" diesel soot filters is outlined. Eighteen doped perovskite catalysts are synthesized and tested for propane and CO oxidation, which are taken as model components for soot. The activity, selectivity, and SO2 tolerance are compared u...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه رازی - دانشکده علوم 1390

abstract ion selective electrodes (ises) are electrochemical sensors that respond selectivity to the activity of ionic species. an ion-selective electrode is an electrochemical device that uses a thin selective membrane or film as the recognition element, and is an electrochemical half-cell equivalent to other half-cells of the zeroth (inert metal in a redox electrolyte). in common methods o...

Journal: :Angewandte Chemie 2014
Michael M Konnick Brian G Hashiguchi Deepa Devarajan Nicholas C Boaz T Brent Gunnoe John T Groves Niles Gunsalus Daniel H Ess Roy A Periana

Direct partial oxidation of methane, ethane, and propane to their respective trifluoroacetate esters is achieved by a homogeneous hypervalent iodine(III) complex in non-superacidic (trifluoroacetic acid) solvent. The reaction is highly selective for ester formation (>99%). In the case of ethane, greater than 0.5 M EtTFA can be achieved. Preliminary kinetic analysis and density functional calcul...

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