Synthesis Of Higher Hydrocarbons Research Articles

Effect of mechanoactivated chemical additives on the process of gas hydrate formation

This study addresses the production of gas hydrate of methane with a high gas-hydrate-forming content in a solid phase in the isolated system at T=274 K and pressure of 5 MPa and presence of mechanically activated rocks close to the bottom of the chamber. We used mechanically activated samples of various degrees of grinding to increase an area of contact surface of heterogeneous phases. We carried out mechanochemical activation of materials in a vertical vibrating mill (VVM). In the study, we found out that formation of gas hydrates on activated aluminosilicates leads to the cryochemical synthesis of hydrocarbons, due to formation of additional reaction centers formed upon activation. This indicates a change in the mechanism of formation of GH during the process. We calculated three rate constants for the formation of GH of methane, which vary from 1.20×10 -2 to 1.25×10 -2 hour -1 , based on semi-logarithmic anamorphosis. The study showed that formation of methane gas hydrates in presence of activated additives leads to formation of up to 5−6 % of ethane. Chromatographic method confirmed this. This indicates possibility of carrying out a low-temperature synthesis of higher hydrocarbons in the artificial production of GH, in contrast to the known mechanochemical transformations during the process of obtaining gas from gas hydrates.

Synthesis of hydrocarbons from a model gas of the gasification of oil shale

Gases from the gasification of oil shale contain CO and H2; this fact makes it possible to use them as a raw material in the synthesis of higher hydrocarbons. The possibility of obtaining a long distillate of hydrocarbons on a cobalt catalyst was demonstrated using a CO-CO2-H2-N2 model mixture of the gasification products of Leningrad shale as an example. In this case, to 83.8% selectivity for C5+ hydrocarbons with a low yield of methane (7.3%) was reached. The resulting hydrocarbons were characterized by a chain growth probability to 0.84.

Bell-boudoir and water gas shift reactions under conditions of the Fischer-Tropsch synthesis

Underground coal gasification gases contain CO and H2; therefore, they can be used as raw materials in the Fischer-Tropsch synthesis of higher hydrocarbons. The profitability can be increased by decreasing the selectivity of this process for undesirable products. The water gas shift and Bell-Boudoir reactions are considered; CO2 is formed as a result of these reactions. Promoted and unpromoted cobalt catalysts on the basis of silica gel and aluminum oxide were tested. The processes occurring on these samples were evaluated quantitatively under the conditions that simulate the Fischer-Tropsch synthesis.

Hydrocarbon synthesis from a model gas of underground coal gasification

Underground coal gasification gases contain CO and H2; therefore, they can be used as raw materials in the synthesis of higher hydrocarbons. The possibility of obtaining a wide-cut hydrocarbon fraction on a cobalt catalyst was demonstrated with the use of CO-H2-N2 and CO-CO2-H2-N2 model mixtures as an example. In this case, the selectivity for C5+ hydrocarbons was to 96% at a low yield of methane. The resulting hydrocarbons were characterized by a chain-growth probability to 0.89.

High temperature catalytic synthesis of higher hydrocarbons from methane

It has been revealed that methane conversion to higher hydrocarbons over MgO catalyst involves the direct participation of heterogeneous catalyst at contact times of up to τ∼3s and is a homogeneous reaction at τ∼10s.

The effect of additions of certain oxides of rare and rare-earth elements on the activities of cobalt catalysts in the synthesis of hydrocarbons from carbon monoxide and hydrogen

1. Among the rare and rare-earth oxides (Y2O3, L2O3, CeO2, Nd2O3, and HfO2), HfO2 (at 190°) and CeO2 (at 200–205°) have the strongest promoting effect on Co-kieselguhr and Co-MgO-kieselguhr catalysts in the synthesis of higher hydrocarbons from CO and H2. 2. The promoting effects of these oxides are weaker than those of ZrO2, TiO2, and ThO2.

Synthesis of Higher Hydrocarbons from Water Gas—II1,2

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of Higher Hydrocarbons from Water Gas—II1,2David F. Smith, Charles O. Hawk, and D. A. ReynoldsCite this: Ind. Eng. Chem. 1928, 20, 12, 1341–1348Publication Date (Print):December 1, 1928Publication History Published online1 May 2002Published inissue 1 December 1928https://doi.org/10.1021/ie50228a019RIGHTS & PERMISSIONSArticle Views22Altmetric-Citations4LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (1 MB) Get e-Alerts

Synthesis of Higher Hydrocarbons from Water Gas1

Synthesis of Higher Hydrocarbons from Water Gas¹