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J. C. Kuriacose

Bio: J. C. Kuriacose is an academic researcher from Indian Institute of Technology Madras. The author has contributed to research in topics: Catalysis & Flash photolysis. The author has an hindex of 9, co-authored 34 publications receiving 248 citations.

Papers
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DOI
01 Aug 1978
TL;DR: In this paper, certain salient features of the oscilliatory reaction in the iodate-hydrogen peroxide-manganese sulphate-malonic acid system are presented.
Abstract: Certain salient features of the oscilliatory reaction in the iodate-hydrogen peroxide-manganese sulphate-malonic acid system are presented Oscillations were followed by recording the potential developed at a platinum electrode Reproducibility of the results in such a complicated system is established Evidence is provided for the periodic formation of Mn3+ in the system Effect of the concentration of the constituents as well as the effect of temperature are discussed
DOI
01 Mar 1984
TL;DR: In this paper, the influence of varying concentrations of Co(dmgh)2, NaOH and axial base on the rate of hydrogenation of fumaric and maleic acids has been studied in detail.
Abstract: The influence of varying concentrations of Co(dmgh)2, NaOH and axial base on the rate of hydrogenation of fumaric and maleic acids has been studied in detail. Intramolecular hydrogen bonding in the monoanion of maleic acid and thetrans orientation of carboxylic acid groups in fumaric acid are important factors which account for the difference in the rate of hydrogenation of these substrates. Mono-, di-and trialkyl amines as axial bases modify the activity of the catalyst, dialkylamines conferring the maximum activity and trialkylamines the least. Back-strain on nitrogen atom and solvation energy of the amines are responsible for their different behaviours. A rate law has been proposed and verified
TL;DR: In this article , the performance of polycrystalline zinc oxide and tungsten trioxide has been compared with similar photoelectrocatalytic reactions of organic compounds, such as alcohols, amines, amide, etc.
Abstract: Different electrode preparations witb polycrystalline zinc oxide and tungsten trioxide have been attempted and their performance studied. Even though both the oxides are o·type semiconductors, their behaviour towards d•ssohed species in the electro· lyte is difterent. Tbe pretreatment of the material and the mode ot preparation of the electrodes influence the performance of the cataly~t. Pbotomduced catalytic reactions of organic compounds llke alcohols, amines, amide&, etc. on these semiconducting oxide powders in suspension are compared witb similar photoelectrocatalytic reactions.
DOI
01 Aug 1988
TL;DR: The transient borate radical is produced by flash photolysis of an aqueous alkaline solution of NaBO2 and K2S2O8 and the absorption spectrum of this radical shows two maxima as mentioned in this paper.
Abstract: The borate radical is produced by the flash photolysis of an aqueous alkaline solution of NaBO2 and K2S2O8. The absorption spectrum of the transient borate radical shows two maxima. The self decay of this radical is second order. Rate constants for the reactions of this radical with some organic substrates have been determined.

Cited by
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Journal ArticleDOI
TL;DR: A review of the known inorganic catalysts with a focus on structure-activity relationships is given in this article, where the first water splitting system based on TiO2 and Pt was proposed by Fujishima and Honda in 1972.
Abstract: Photochemical splitting of water into H2 and O2 using solar energy is a process of great economic and environmental interest. Since the discovery of the first water splitting system based on TiO2 and Pt in 1972 by Fujishima and Honda, over 130 inorganic materials have been discovered as catalysts for this reaction. This review discusses the known inorganic catalysts with a focus on structure–activity relationships.

1,977 citations

Journal ArticleDOI
TL;DR: Past and present developments in hydrogenolysis reactions are highlighted, with special emphasis on the direct utilization of cellulosic feedstocks, to bridge currently available technologies and future biomass-based refinery concepts.
Abstract: In view of the diminishing oil resources and the ongoing climate change, the use of efficient and environmentally benign technologies for the utilization of renewable resources has become indispensible. Therein, hydrogenolysis reactions offer a promising possibility for future biorefinery concepts. These reactions result in the cleavage of C-C and C-O bonds by hydrogen and allow direct access to valuable platform chemicals already integrated in today's value chains. Thus, hydrogenolysis bears the potential to bridge currently available technologies and future biomass-based refinery concepts. This Review highlights past and present developments in this field, with special emphasis on the direct utilization of cellulosic feedstocks.

735 citations

Journal ArticleDOI
TL;DR: For a variety of metals and semiconductors, an attempt is made to generalize observations in the literature on the effect of process conditions applied during photodeposition on (i) particle size distributions, (ii) oxidation states of the metals obtained, and (iii) consequences for photocatalytic activities.
Abstract: In this review, for a variety of metals and semiconductors, an attempt is made to generalize observations in the literature on the effect of process conditions applied during photodeposition on (i) particle size distributions, (ii) oxidation states of the metals obtained, and (iii) consequences for photocatalytic activities. Process parameters include presence or absence of (organic) sacrificial agents, applied pH, presence or absence of an air/inert atmosphere, metal precursor type and concentration, and temperature. Most intensively reviewed are studies concerning (i) TiO2; (ii) ZnO, focusing on Ag deposition; (iii) WO3, with a strong emphasis on the photodeposition of Pt; and (iv) CdS, again with a focus on deposition of Pt. Furthermore, a detailed overview is given of achievements in structure-directed photodeposition, which could ultimately be employed to obtain highly effective photocatalytic materials. Finally, we provide suggestions for improvements in description of the photodeposition methods applied when included in scientific papers.

648 citations

Journal ArticleDOI
TL;DR: The use of CO as a reductant had been in the past confined to few reactions, but its use in organic synthesis, especially in the reductive carbonylation of nitro aromatics and the oxidative carbonylations of aromatic amines, has increased dramatically as mentioned in this paper.
Abstract: Although the use of CO as a reductant had been in the past confined to few reactions, its use in organic synthesis, especially in the reductive carbonylation of nitro aromatics and the oxidative carbonylation of aromatic amines, has increased dramatically. Since the discovery of CO-induced reduction of nitro groups, there has been a wide spread increase of interest in the application and mechanistic understanding of this reaction. In a major review published in 1988 it was noted, that in practice no studies of the mechanism of N-carbonylation of aromatic nitro compounds with alcohols leading to carbamates have been carried out. This review clearly shows a major change since that publication. Indeed, metal-catalyzed reductive carbonylation of nitro aromatics using CO as reducing agent has been in the past 10 years the subject of intense investigation both in academia and in the chemical industry. Several articles and reviews have covered the subject up to the late 1980s. The authors will concentrate on more recent literature, but sometimes older data will be used to establish an understanding of these reactions. 127 refs.

622 citations

Journal ArticleDOI
TL;DR: A framework for this hypothesis is provided and the potential sources and properties of these radicals that are likely to become increasingly recognized as important mediators of biological processes are discussed.

487 citations