Hydrothermal Synthesis of In2O3-SiO2 as Recyclable Mesostructured Catalyst Utilized for 2,3-Dihydrophthalazine-1,4-dione (DHP) Derivatives

Abstract

Mesostructured In2O3-SiO2 as recyclable heterogeneous catalyst material was synthesized by an aqueous solution based wet chemistry method, i.e. hydrothermal method and utilized for the reaction between pathalic anhydride and substituted hydrazine hydrate in DMF medium to synthesize 2,3-dihydrophthalazine-1,4-dione (DHP) derivatives. The advantages of this protocol are cost effective, ease of handling and environmental friendly. This catalytic material were characterized by using X-ray diffraction spectroscopy, scanning electron microscopy, energy dispersive spectroscopy, Fourier transform infrared spectroscopy, temperature-programmed desorption and Brunauer–Emmett–Teller. The proposed synthetic method results in a high yield, has an easy work-up procedure, is non-toxic and clean, and facilitates the simple recovery and reusability of the catalytic system.

Approaches for selectivity improvement of conductometric gas sensors: an overview

“…In this case, the interference gas was completely converted into an inert species to improve the sensor selectivity. Common catalytic filters included ceramic carriers (alumina, silica and ferric oxide) on precious metals (such as Pt, Pd and Au), 30 metal oxides, 130 mixed metal catalysts, 131 etc. Their surface composition, structure and operating temperature jointly determined the overall reactivity and then the selectivity.…”