@article { ISI:000309370500003, title = {Carbon dioxide capture using amine functionalized silica gel}, journal = {Indian Journal of Chemistry Section A-Inorganic Bio-Inorganic Physical Theoretical \& Analytical Chemistry}, volume = {51}, number = {9-10, SI}, year = {2012}, month = {SEP}, pages = {1214-1222}, publisher = {NATL INST SCIENCE COMMUNICATION-NISCAIR}, address = {DR K S KRISHNAN MARG, PUSA CAMPUS, NEW DELHI 110 012, INDIA}, abstract = {

Commercially available silica gel is chemically modified for carbon dioxide capture. Calcinated silica gel of certain particle size functionalized with amine using two different methods, wet impregnation and grafting via silane chemistry has been employed as a porous media. The prepared material is characterized by Fourier transform infrared, scanning electron microscopy, energy dispersive analysis of X-rays, thermogravimetry and N-2 physisorption techniques. Gas uptake measurements have been carried out to ascertain the CO2 capture capacity of the amine functionalized material. The experiments have been carried out at moderate pressure and temperature range to ascertain its potential for easy scale up.

}, keywords = {Amine functionalized silica gel, Carbon dioxide capture, grafting, Poly(ethyleneimine), Silane chemistry, Wet impregnation}, issn = {0376-4710}, author = {Sakpal, Tushar and Kumar, Asheesh and Kamble, Sanjay and Kumar, Rajnish} } @article { ISI:000311935400073, title = {Influence of contact medium and surfactants on carbon dioxide clathrate hydrate kinetics}, journal = {Fuel}, volume = {105}, year = {2013}, month = {MAR}, pages = {664-671}, publisher = {ELSEVIER SCI LTD}, address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND}, abstract = {

Carbon dioxide (CO2) hydrate formation kinetic was investigated in a fixed bed crystallizer at constant pressure (3.55 MPa) and temperature (274 K). Porous media of three different silica gels were used, with a mesh size of 60-120, 100-200 and 230-400 having different surface area. The observed trends indicate that silica gel with larger surface area leads to higher gas consumption as well as reduces the induction time. The effect of pore diameter and particle size distribution has already been reported in a previous study [1]. In this study the effect of additives on hydrate formation kinetics were also investigated. The additives studied were nonionic surfactant Tween-80 (T-80), cationic dodecyltrimethylammonium chloride (DTACl) and anionic Sodium Dodecyl Sulphate (SDS). Out of the three surfactants used in this study, SDS was found to be most effective in enhancing the rate of hydrate formation as well as reducing the induction time. The current result shows significant improvement in water to hydrate conversion in silica gel media compared to quiescent water or surfactant-water system under similar conditions. (C) 2012 Elsevier Ltd. All rights reserved.

}, keywords = {Carbon dioxide capture, Clathrate hydrate, kinetics, Silica gel, Surfactants}, issn = {0016-2361}, doi = {10.1016/j.fuel.2012.10.031}, author = {Kumar, Asheesh and Sakpal, Tushar and Linga, Praveen and Kumar, Rajnish} } @article {47049, title = {Hydrate-based carbon capture process: assessment of various packed bed systems for boosted kinetics of hydrate formation}, journal = {Journal of Energy Resources Technology-Transactions of the ASME}, volume = {143}, year = {2021}, month = {MAR }, pages = {033005}, type = {Article}, abstract = {

The case for developing novel technologies for carbon dioxide (CO2) capture is fast gaining traction owing to increasing levels of anthropogenic CO2 being emitted into the atmosphere. Here, we have studied the hydrate-based carbon dioxide capture and separation process from a fundamental viewpoint by exploring the use of various packed bed media to enhance the kinetics of hydrate formation using pure CO2 as the hydrate former. We established the fixed bed reactor (FBR) configuration as a superior option over the commonly used stirred tank reactor (STR) setups typically used for hydrate formation studies by showing enhanced hydrate formation kinetics using the former. For the various packing material studied, we have observed silica gel with 100 nm pore size to return the best kinetic performance, corresponding to a water to hydrate conversion of 28 mol\% for 3 h of hydrate growth. The fundamental results obtained in the present study set up a solid foundation for follow-up works with a more applied perspective and should be of interest to researchers working in the carbon dioxide capture and storage and gas hydrate fields alike.

}, keywords = {air emissions from fossil fuel combustion, Carbon dioxide capture, combustion of waste, Fixed bed reactor, fuel combustion, Gas hydrate, hydrates, kinetics, Silica gel}, issn = {0195-0738}, doi = {10.1115/1.4048304}, author = {Arora, Amit and Kumar, Asheesh and Bhattacharjee, Gaurav and Balomajumder, Chandrajit and Kumar, Pushpendra} }