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Author

Rajnish Kumar

Bio: Rajnish Kumar is an academic researcher from Indian Institute of Technology Madras. The author has contributed to research in topics: Hydrate & Clathrate hydrate. The author has an hindex of 39, co-authored 101 publications receiving 5724 citations. Previous affiliations of Rajnish Kumar include Indian Institute of Science & National Research Council.


Papers
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Journal ArticleDOI
TL;DR: The present study illustrates the concept and provides basic thermodynamic and kinetic data for conceptual process design of hybrid conceptual processes for pre and post-combustion capture based on hydrate formation coupled with membrane separation.

476 citations

Journal ArticleDOI
01 Jun 2015-Energy
TL;DR: In this paper, a systematic review of the literature work done so far on the use of hydrate crystallization as a basis to develop data for the hydrate based gas separation (HBGS) process for the capture of CO2 from fuel gas mixtures is presented.

448 citations

Journal ArticleDOI
01 Oct 2004-Fuel
TL;DR: In this article, the transesterification of sunflower oil was investigated in supercritical methanol and supercritical ethanol at various temperatures at 200 bar and the rate coefficients and activation energies of the reaction were determined.

384 citations

Journal ArticleDOI
TL;DR: In this article, gas hydrates from CO 2 / N 2 and CO 2/H 2 gas mixtures were formed in a semi-batch stirred vessel at constant pressure and temperature of 273.7 K. During hydrate formation the gas uptake was determined and the composition changes in the gas phase were obtained by gas chromatography.

341 citations

Journal ArticleDOI
TL;DR: In this paper, a review comprehensively summarizes the state of the art experimental work conducted on the storage of hydrogen as hydrogen clathrates both at the molecular level and macroscopic level and identifies future directions and challenges for this exciting area of research.

319 citations


Cited by
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Journal ArticleDOI
TL;DR: The most recent developments and emerging concepts in CO(2) separations by solvent absorption, chemical and physical adsorption, and membranes, amongst others, will be discussed, with particular attention on progress in the burgeoning field of metal-organic frameworks.
Abstract: The escalating level of atmospheric carbon dioxide is one of the most pressing environmental concerns of our age. Carbon capture and storage (CCS) from large point sources such as power plants is one option for reducing anthropogenic CO(2) emissions; however, currently the capture alone will increase the energy requirements of a plant by 25-40%. This Review highlights the challenges for capture technologies which have the greatest likelihood of reducing CO(2) emissions to the atmosphere, namely postcombustion (predominantly CO(2)/N(2) separation), precombustion (CO(2)/H(2)) capture, and natural gas sweetening (CO(2)/CH(4)). The key factor which underlies significant advancements lies in improved materials that perform the separations. In this regard, the most recent developments and emerging concepts in CO(2) separations by solvent absorption, chemical and physical adsorption, and membranes, amongst others, will be discussed, with particular attention on progress in the burgeoning field of metal-organic frameworks.

3,388 citations

Journal ArticleDOI
TL;DR: In this paper, various aspects of CCS are reviewed and discussed including the state of the art technologies for CO2 capture, separation, transport, storage, leakage, monitoring, and life cycle analysis.
Abstract: Global warming and climate change concerns have triggered global efforts to reduce the concentration of atmospheric carbon dioxide (CO2). Carbon dioxide capture and storage (CCS) is considered a crucial strategy for meeting CO2 emission reduction targets. In this paper, various aspects of CCS are reviewed and discussed including the state of the art technologies for CO2 capture, separation, transport, storage, leakage, monitoring, and life cycle analysis. The selection of specific CO2 capture technology heavily depends on the type of CO2 generating plant and fuel used. Among those CO2 separation processes, absorption is the most mature and commonly adopted due to its higher efficiency and lower cost. Pipeline is considered to be the most viable solution for large volume of CO2 transport. Among those geological formations for CO2 storage, enhanced oil recovery is mature and has been practiced for many years but its economical viability for anthropogenic sources needs to be demonstrated. There are growing interests in CO2 storage in saline aquifers due to their enormous potential storage capacity and several projects are in the pipeline for demonstration of its viability. There are multiple hurdles to CCS deployment including the absence of a clear business case for CCS investment and the absence of robust economic incentives to support the additional high capital and operating costs of the whole CCS process.

2,181 citations

Journal ArticleDOI
TL;DR: The most important variables affecting methyl ester yield during the transesterification reaction are the molar ratio of alcohol to vegetable oil and the reaction temperature as discussed by the authors, which is the commonly used alcohol in this process, due to its low cost.

1,798 citations

Journal Article
TL;DR: In this paper, the authors presented a method to detect the presence of a tumor in the human brain using EPFL-206025 data set, which was created on 2015-03-03, modified on 2017-05-12
Abstract: Note: Times Cited: 875 Reference EPFL-ARTICLE-206025doi:10.1021/cr0501846View record in Web of Science URL: ://WOS:000249839900009 Record created on 2015-03-03, modified on 2017-05-12

1,704 citations

Journal ArticleDOI
TL;DR: A review of modern biomass-based transportation fuels such as fuels from Fischer-Tropsch synthesis, bioethanol, fatty acid (m)ethylester, biomethanol, and biohydrogen are briefly reviewed in this paper.

1,505 citations