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M.R. Udupa

Bio: M.R. Udupa is an academic researcher from Indian Institute of Technology Madras. The author has contributed to research in topics: Thermal decomposition & Chromium. The author has an hindex of 6, co-authored 31 publications receiving 133 citations.

Papers
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Journal ArticleDOI
TL;DR: In this paper, a study of the thermal decomposition of intimate mixtures of different molar ratios of KClO4 and chromium(III) oxide was conducted employing thermogravimetry, differential thermal analysis, chemical analysis, infrared spectroscopy and X-ray diffraction analysis.

22 citations

Journal ArticleDOI
TL;DR: In this article, thermal decomposition studies of intimate mixtures of different molar ratios of potassium nitrate and chromium(III) oxide were made by employing thermogravimetry differential thermal analysis, chemical analysis, infrared spectral measurements and X-ray powder diffraction patterns.

11 citations

Journal ArticleDOI
TL;DR: In this paper, the preparation, characterization and thermal behaviour of morpholinium perchlorate are reported, followed by XRD, IR, TG, DTA and mass spectral techniques.

10 citations


Cited by
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Journal ArticleDOI
TL;DR: In this article, it was shown that in the presence of H2O or excess surface OH groups this is converted to type groups, thus accounting for the increased Bronsted acidity.

359 citations

Journal ArticleDOI
TL;DR: In this paper, fine-particle metal chromites (MCr2O4, where M = Mg, Ca, Mn, Fe, Co, Ni, Cu, and Zn) were prepared by the combustion of aqueous solutions containing the respective metal nitrate, chromium(III), and urea in stoichiometric amounts.
Abstract: Fine-particle metal chromites (MCr2O4, where M = Mg, Ca, Mn, Fe, Co, Ni, Cu, and Zn) have been prepared by the combustion of aqueous solutions containing the respective metal nitrate, chromium(III) nitrate, and urea in stoichiometric amounts. The mixtures, when rapidly heated to 350°C, ignite and yield voluminous chromites with surface areas ranging from 5 to 25 m2/g. MgCr2O4, sintered in air at 1500°C for 5 h, has a density of 4.0 g/cm3.

164 citations

Journal ArticleDOI
TL;DR: In this paper, the infrared reflection and Raman spectra of spinel type oxides M Cr 2 O 4 (Mg, Mn, Fe, Co, Ni, Cu, Zn) including Kramers-Kronig analyses and oscillator-fit calculations are presented.

128 citations

Journal ArticleDOI
TL;DR: In this article, the effect of TMO catalysts on solid propellant burning and decomposition, oxidizer burning, and sandwich and condensed mixture combustion is discussed. But, the exact mechanism of the effect on the burning rate modification of composite solid propellants is not clear even today.
Abstract: Introduction T metal oxides (TMO) like Fe2O3, CuO, MnO2, CuCr2O4, etc., form a very popular group of catalysts for burning rate modification of composite solid propellants. Although it is well known that these oxides affect the decomposition characteristics of polymers and oxidizers like ammonium perchlorate (AP)' and potassium perchlorate, (KP) the exact mechanism of the effect on solid propellants is by no means clear even today. Much fragmentary literature is available on the effect of these oxides on propellant burning and decomposition, oxidizer burning and decomposition, and sandwich and condensed mixture combustion. It is the purpose of this review to bring the material together so that a comprehensive picture can be drawn of the mechanism of the action of these catalysts. It may be mentioned here that these oxides also catalyze hydrocarbon oxidation reactions by inducing free radical decomposition of hydroperoxides (formed by the contact of oxidizer and hydrocarbon).

91 citations

Journal ArticleDOI
TL;DR: The chemistry of simple acyclic aminophosphines (synthesis, characterization, reactivity and applications) is covered and particular focus is given to their ability to form chalcogenides along with their role played as ligands in coordination chemistry and as synthons in inorganic heterocyclic chemistry as mentioned in this paper.
Abstract: In recent years, research in organophosphorus chemistry has mainly focused in designing newer and better phosphorus ligands for synthesizing novel metal complexes with improved catalytic activities. Aminophosphines [tricoordinate phosphorus(III)–nitrogen systems] are considered as versatile compounds owing to the presence of nitrogen centres which, in principle, can influence additional reactivity features. They are quite sensitive to air and moisture due to the presence of polar PN bond(s). In spite of this, research in aminophosphine chemistry is gaining momentum day-by-day and this is due mainly to one reason: their rich behaviour as ligands in metal complex chemistry and subsequently in catalysis. Their role as synthons in inorganic heterocyclic chemistry has also helped produce new types of heterocycles. In this paper, the chemistry of simple acyclic aminophosphines (synthesis, characterization, reactivity and applications) is covered and particular focus is given to their ability to form chalcogenides along with their role played as ligands in coordination chemistry and as synthons in inorganic heterocyclic chemistry. Copyright © 2009 John Wiley & Sons, Ltd.

79 citations