نتایج جستجو برای: supported vanadia catalyst

تعداد نتایج: 234385  

Journal: :Journal of the Japan Petroleum Institute 2017

Journal: :Chemical & pharmaceutical bulletin 2008
Biswanath Das Martha Krishnaiah Keetha Laxminarayana Duddukuri Nandankumar

Silica supported phosphomolybdic acid, an eco-friendly heterogeneous catalyst, has been found to be highly efficient for Friedlander synthesis of quinolines in excellent yields. A variety of ketones afford the quinolines smoothly. The catalyst can be easily recovered and reused.

Journal: :Chemical communications 2014
S Jagtap Y Kaji A Fukuoka K Hara

A high density monolayer of diisocyanide on gold surface was utilized as a platform of supported Rh catalyst for selective 1,4-hydrogenation of α,β-unsaturated carbonyl compounds. The catalyst exhibited high turnover numbers in a range of 50 000 to 150 000 per Rh atom and showed steady catalyst performance over six recycle usages.

Journal: :Physical chemistry chemical physics : PCCP 2009
Sepideh Zamani Vera Meynen Alina-Mihaela Hanu Myrjam Mertens Eveline Popovici Sabine Van Doorslaer Pegie Cool

Framework-incorporated vanadium mesoporous silica materials with different contents in vanadium were obtained by a facile, direct synthesis at room temperature, using VOSO4 x 5H2O as the vanadium precursor. The porous characteristics of the samples and the coordination environment of the vanadia in the structure were studied by a combination of techniques: X-ray diffraction, N2-adsorption/desor...

Journal: :Chemical communications 2008
Anna Komáromi Zoltán Novák

Palladium on charcoal serves as an efficient and reusable solid supported catalyst for the Sonogashira coupling of aryl chlorides with terminal acetylenes in the presence of a bulky, electron-rich biphenyl type ligand (XPhos), without copper co-catalyst.

In this paper, 4,4ʹ-bipyridinium dichloride  supported SBA-15 (SBA@BiPy2+ 2Cl-) was used for the synthesis of dihydropyrimidinones. The synthesized catalyst was characterized by FT-IR spectroscopy, scanning electron microscopy (SEM), Transmission electron microscopy (TEM) and Thermogravimetric analysis (TGA). This nanocomposite was shown to be an efficient heterogeneous ca...

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