نتایج جستجو برای: natural catalyst

تعداد نتایج: 524102  

Journal: :iranian journal of catalysis 2016
zinat gordi mohammad vazan

substituted 2, 4- diphenyl quinolines were synthesized by a multicomponent domino reaction of anilines, aldehydes and terminal aryl alkynes. the synthetic pathway involves the formation of an imine, followed by the intermolecular addition of an alkyne to the imine. this intermediate immediately undergoes ring closure and oxidative aromatization. the reaction is catalyzed by natural kaolin, a st...

Journal: :jundishapur journal of natural pharmaceutical products 0
mohammad reza bigdeli department of chemistry, ahvaz branch, islamic azad university, ahvaz, ir iran mohammad reza shushizadeh department of medicinal chemistry, marine pharmaceutical science research center, ahvaz jundishapur university of medical sciences, ahvaz, ir iran; department of medicinal chemistry, marine pharmaceutical science research center, ahvaz jundishapur university of medical sciences, ahvaz, ir iran. tel/fax: +98-6113738379 bahare mohandespur islamic azad university of ahvaz, ahvaz, ir iran

conclusions calcined coral/sodium nitrate as a new, efficient, and natural heterogeneous catalyst used in aldol condensation reaction of ketones and aldehydes led to β-hydroxyketones in good to high yields in appropriate condition. materials and methods marine coral (acropora sp.) was washed several times using methanol-ethyl acetate and deionized water and then dried in an oven at 80°c for 48 ...

2002
John D. Burger

Qanda uses a general architecture for human language technology called Catalyst, (Burger & Mardis 2002, Nyberg et al., to appear). Developed at MITRE for the DARPA TIDES program, the Catalyst architecture is specifically designed for fast processing and for combining the strengths of Information Retrieval and Natural Language Processing into a single framework. Catalyst uses a dataflow architec...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه سیستان و بلوچستان 1390

during natural gas processing, water in natural gas may cause to hydrates formation in pipelines which may lead to serious damages to process equipments. given the problems raised by present of water in natural gas, glycol solvent uses to remove water.in contact of glycol with gas always an amount of btex and voc absorb along with water, which on glycol recovery process, these substances separa...

Journal: :Journal of the American Chemical Society 2003
Sean P Brown Michael P Brochu Christopher J Sinz David W C MacMillan

The first direct enantioselective catalytic alpha-oxidation of carbonyls has been accomplished. The use of enamine catalysis has provided a new organocatalytic strategy for the enantioselective oxyamination of aldehydes, to generate alpha-oxyaldehydes, important chiral synthons for natural product and medicinal agent synthesis. The use of l-proline as the asymmetric catalyst has been found to m...

2007
Linjie Hu Shazam Williams

Palladium-based catalyst can be employed for natural gas exhaust clean up due to its high activity for light hydrocarbon oxidation. Unfortunately, trace amounts of sulfur in the natural gas feed severely deactivate the catalyst. In this paper, SO2 adsorption over a monolithic Pd/Al2O3 oxidation catalyst is monitored in a time-resolved manner in the presence of 100 ppm SO2 under simulated aging ...

2015
Ahed Zyoud Amani Zu’bi Muath H. S. Helal DaeHoon Park Guy Campet Hikmat S. Hilal

BACKGROUND Photo-degradation of organic contaminants into non-hazardous mineral compounds is emerging as a strategy to purify water and environment. Tremendous research is being done using direct solar light for these purposes. In this paper we report on optimum conditions for complete mineralization of aqueous methyl orange using lab-prepared ZnO nanopowder catalyst under simulated solar light...

Fereshteh farrokhi nejad Mohammad Reza Shushizadeh,

A natural and efficient method has been developed for the synthesis of quinoline derivatives in good-to-high yields, from various aryl aldehydes, amines and phenyl acethylene, using marine sponge/I2 as a green catalyst

2013
Driss Ouzebla Hassan B. Lazrek Michael Smietana Jean-Jacques Vasseur

An efficient Knoevenegel reaction, addition of Michael, trans-esterification for the synthesis of new polyanionic acyclonucleosids using natural phosphate as catalyst

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