Auswahl der wissenschaftlichen Literatur zum Thema „Méthanethiol – Synthèse“
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Dissertationen zum Thema "Méthanethiol – Synthèse":
Péruch, Olivier. „Nouveaux catalyseurs pour la synthèse du méthanethiol par hydrosulfuration du méthanol“. Thesis, Poitiers, 2017. http://www.theses.fr/2017POIT2282.
Methanethiol is a key intermediate in methionine synthesis, an amino-acid which is widely used in food-processing industry
Gay, Julien. „Synthèse de méthanethiol à partir de méthanol et d'H2S en présence de K2WO4/Al2O3“. Thesis, Poitiers, 2014. http://www.theses.fr/2014POIT2297.
Methanethiol (MeSH) is a key intermediate involved in the synthesis of methionine, an essential amino acid widely used in food-processing industry. Given that methionine market is constantly growing, optimizing MeSH production from methanol (MeOH) and hydrogen sulfide (H2S) is of paramount importance. The impact of key parameters, such as MeOH conversion, temperature, or H2S/MeOH molar ratio has been studied in a range consistent with industrial conditions. A strong inhibiting effect of water (which is the co-product of the reaction) has been highlighted, both on catalytic activity and selectivities towards the different products. However, carbon dioxide (CO2) and carbon monoxide (CO), which are non-recoverable products, have no influence on catalytic performances. A complete reaction scheme accounting for the formation of the different reaction products has been proposed. A kinetic model using Langmuir-Hinshelwood formalism was developed, which affords precise estimation of experimental data.Characterization of K2WO4/Al2O3 catalyst confirmed that acid-base dual sites were the active sites responsible for MeSH formation. Acidity is mainly brought by tungsten species whereas potassium addition allows increasing the basicity of the catalyst. Based on these observations, the catalytic performances of rare-earth based oxides, which possess stronger acidity and basicity, have been measured. These materials exhibit significantly higher activity than K2WO4/Al2O3 catalyst, with similar MeSH selectivity
Montroussier, Nicolas. „Développement de catalyseurs sulfures supportés pour la conversion de CO et CO2 en méthanethiol“. Electronic Thesis or Diss., Université de Lille (2022-....), 2022. http://www.theses.fr/2022ULILR078.
Methanethiol (CH3SH) is a platform chemical molecule whose major use is related to its role as an intermediary for the synthesis of methionine, an essential amino acid which global demand is constantly increasing. Industrially, methanethiol is mainly synthesized from methanol and hydrogen sulfide (H2S). Since methanol itself is most often obtained from a CO/H2 mixture derived from fossil resources, the environmental footprint or even the economic cost of the catalytic process for the synthesis of methanethiol could be substantially reduced by preparing it directly from CO/H2/H2S mixture. This approach is in line with the design of new strategies of synthesis more respectful of the environment. The catalyst formulations developed were evaluated in tests carried out under conditions close to industrial conditions. The catalytic performances were confronted to the characterizations of the solids in the oxide and sulfide state before/after catalytic tests in order to identify the nature of the active phase
Cordova, Alexia. „Supported molybdenum and tungsten based catalysts for the direct synthesis of methylmercaptan from syngas“. Thesis, Lille 1, 2013. http://www.theses.fr/2013LIL10012/document.
Methyl mercaptan (CH3SH), widely used as raw material for the production of organosulfur compounds such as methionine, is commercially synthesized by the reaction of methanol with hydrogen sulfide. Although the formation of CH3SH from CH3OH/H2S route is a fast and selective reaction, a several-steps pathway is required for the synthesis of methanol (CH4 + H2O --------> Syngas --------> Methanol). In this regard, the one-step synthesis of methyl mercaptan from simple starting materials (syngas + hydrogen sulfide) is increasingly attractive for industrial application. So far, the disclosed researches in CH3SH production by this route have been focused in the improvement of catalytic performances. In this work, the improvement of catalytic performances as well as the understanding of the nature of the active phase has been studied. K-Mo(W)-based catalysts supported on alumina, silica and hydroxyapatite were used with this purpose. Different metal loading and catalytic pretreatment were evaluated. The simultaneous presence of Mo and K in the catalytic system allows achieving higher CO conversions and CH3SH selectivity and a decrease in CO2 selectivity. The higher CH3SH productivity was achieved with a high loaded K2MoO4/Al2O3 catalyst (211,4 g.h-1.L-1). With the study and analysis of a series of reference catalysts characterized by XPS, we evidenced the presence of a new phase named KxMS2 (M = Mo or W) in which potassium cations are intercalated between the Mo(W)S2 layers. By correlating the amount of KxMS2 phase with the catalytic performances, we observed that the higher the amount of KxMS2 phase in the catalyst, the higher the CO conversion in the reaction of syngas with hydrogen sulfide to produce CH3SH. Based on these statements we propose that KxMS2 is the active phase acting in the reaction of thiolation of syngas
Cordova, Alexia. „Supported molybdenum and tungsten based catalysts for the direct synthesis of methylmercaptan from syngas“. Electronic Thesis or Diss., Lille 1, 2013. http://www.theses.fr/2013LIL10012.
Methyl mercaptan (CH3SH), widely used as raw material for the production of organosulfur compounds such as methionine, is commercially synthesized by the reaction of methanol with hydrogen sulfide. Although the formation of CH3SH from CH3OH/H2S route is a fast and selective reaction, a several-steps pathway is required for the synthesis of methanol (CH4 + H2O --------> Syngas --------> Methanol). In this regard, the one-step synthesis of methyl mercaptan from simple starting materials (syngas + hydrogen sulfide) is increasingly attractive for industrial application. So far, the disclosed researches in CH3SH production by this route have been focused in the improvement of catalytic performances. In this work, the improvement of catalytic performances as well as the understanding of the nature of the active phase has been studied. K-Mo(W)-based catalysts supported on alumina, silica and hydroxyapatite were used with this purpose. Different metal loading and catalytic pretreatment were evaluated. The simultaneous presence of Mo and K in the catalytic system allows achieving higher CO conversions and CH3SH selectivity and a decrease in CO2 selectivity. The higher CH3SH productivity was achieved with a high loaded K2MoO4/Al2O3 catalyst (211,4 g.h-1.L-1). With the study and analysis of a series of reference catalysts characterized by XPS, we evidenced the presence of a new phase named KxMS2 (M = Mo or W) in which potassium cations are intercalated between the Mo(W)S2 layers. By correlating the amount of KxMS2 phase with the catalytic performances, we observed that the higher the amount of KxMS2 phase in the catalyst, the higher the CO conversion in the reaction of syngas with hydrogen sulfide to produce CH3SH. Based on these statements we propose that KxMS2 is the active phase acting in the reaction of thiolation of syngas