Open AccessSynthesis of Zirconia Doped Molybdenum Oxide as Efficient Catalysts for Ultrasound Assisted Synthesis of Substituted Pyrazoles
Author(s) -
Amal A. Muftah,
Shobha Waghmode,
Sharda P. Dagade
Publication year - 2021
Publication title -
asian journal of chemistry/asian journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.145
H-Index - 34
eISSN - 0975-427X
pISSN - 0970-7077
DOI - 10.14233/ajchem.2021.23260
Subject(s) - chemistry , catalysis , nanocrystalline material , x ray photoelectron spectroscopy , molybdenum , yield (engineering) , cubic zirconia , inorganic chemistry , hydrazine (antidepressant) , raman spectroscopy , oxide , desorption , nuclear chemistry , mixed oxide , chemical engineering , organic chemistry , ceramic , adsorption , materials science , physics , optics , chromatography , engineering , metallurgy , crystallography
To explore green methodology for the synthesis of mixed oxide, its catalytic activity and temperaturestability of series of ZrO2/MoO3 and ZrO2 were prepared by sol-gel method and characterized byXRD, FT-IR, X-ray photoelectron spectroscopy (XPS), temperature programmed Desorption (TPD),Raman spectroscopy and transmission electron microscopes (TEM). These mixed oxides were showedhigh stability with nanocrystalline nature. Due to highly acidic nature of the catalysts, ultra soundassisted synthesis of substituted pyrazoles was carried out successfully with high yield. The reactionwas carried out in solvent free medium, which showed green approach and energy saving reaction.Condensation of dibenzoyl methane and hydrazine to form substituted pyrazoles with 97.7% yield.The acid strength and acid amount of synthesized catalysts were determined by temperature programmeddesoprtion (TPD), incorporation of zirconia into the molybdenum, network has changed its surface acidproperties due to the Zr2+ and Mo6+ ions. After addition of ZrO2 on MoO3, it showed weak and strongacid sites.