Showing papers by "Preeti Aghalayam published in 2007"
TL;DR: In this article, the potential for UCG in India is studied by comparing the properties of Indian coals with those of coal that are utilized by various UCG trials, which will help to motivate both applied and theoretical research on UCG sites in India and after detailed analysis it will provide basic data to interested industries.
195 citations
TL;DR: In this article, a quantitative surface reaction mechanism based on elementary steps was developed to understand the phenomena of catalytic reduction of NO by CO. The elementary reaction mechanism was coupled with the continuously stirred tank reactor/packed bed reactor models and the simulation results were validated against literature experiments for the NO-CO reaction on Pt, and the NO−CO-O 2 reaction on Ir catalyst.
38 citations
TL;DR: In this article, the acid-catalyzed dimerization of C4 olefins was performed in a batch reactor, and a suitable rate model was developed to evaluate the performance of a continuous reactive distillation (RD) column.
Abstract: Kinetic analysis for the acid-catalyzed dimerization of C4 olefins was performed in a batch reactor, and a suitable rate model was developed. It was further used in the rate-based simulation model of a continuous reactive distillation (RD) column. The results obtained were compared with the experimental observations made on a pilot-scale high-pressure RD column. An important outcome of the present work is that RD can be used efficiently to enhance the selectivity of C8 dimers, thereby avoiding the formation of trimers and tetramers. The use of polar components (such as water or alcohols), as selectivity enhancers, is not necessary.
24 citations
TL;DR: In this article, an elementary reaction mechanism based on NO dissociation applicable to Pt group catalysts and simulated with CHEMKIN 4.0.2 using single and multiple PSR (Perfectly Stirred Reactor) model is presented.
Abstract: Catalytic reduction using CO has significant potential for the control of NOx using Pt group catalysts as CO is already present in the exhausts and Pt group catalysts have high durability in the presence of SO2 and H2O. Different reaction mechanisms are given in the literature for this reaction based on NO dissociation, -NCO formation and so on, but the exact reaction mechanism capable of capturing experimentally observed features is as yet unavailable. To determine the kinetics and reaction mechanism, we propose here an elementary reaction mechanism based on NO dissociation applicable to Pt group catalysts and simulated with CHEMKIN 4.0.2 using single and multiple PSR (Perfectly Stirred Reactor) model. The activation energies of the elementary steps are found from the Unity Bond Index-Quadratic Exponential Potential (UBI-QEP) method. Excellent agreement between literature experiments and our simulation results are observed for the NO-CO reaction on Pt and Rh catalysts and for the NO-CO-O2 reaction on Ir catalyst. The effect of temperature on the NO reduction activity is captured well by the model. Additionally the simulations can also point towards importance of particular reactions, selectivity to N2, effects of surface coverage, effects of residence time and catalytic surface area on NO reduction.
5 citations