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368 results on '"Schuurman, Y."'

204. A non stationary kinetic approach of the methylcyclohexane cracking

Author

Fierro, Vanessa, Schuurman, Y., Mirodatos, C., Duplan, J.L., Verstraete, J., IRCELYON, ProductionsScientifiques, Institut de recherches sur la catalyse (IRC), and Centre National de la Recherche Scientifique (CNRS)

Subjects
[CHIM.CATA] Chemical Sciences/Catalysis, [CHIM.CATA]Chemical Sciences/Catalysis
Published
2001

212. On the oxygen prpomoting effect in the reaction of NO reduction with CH4 on Co/ZSM-5

Author

Pinaeva, L., Suknev, A., Sadovskaya, E., Goncharov, V., Sadykov, V.A., Balzhinimaev, B., Schuurman, Y., Decamp, T., Mirodatos, C., Institut de recherches sur la catalyse (IRC), Centre National de la Recherche Scientifique (CNRS), and IRCELYON, ProductionsScientifiques

Subjects
[CHIM.CATA] Chemical Sciences/Catalysis, [CHIM.CATA]Chemical Sciences/Catalysis
Published
1998

213. The third kinetic strategy

Author

Gleaves, J.T., Yablonsky, G.S., Schuurman, Y., Institut de recherches sur la catalyse (IRC), Centre National de la Recherche Scientifique (CNRS), and IRCELYON, ProductionsScientifiques

Subjects
[CHIM.CATA] Chemical Sciences/Catalysis, [CHIM.CATA]Chemical Sciences/Catalysis
Published
1998

214. the TAP-2 reactor as a new tool for the investigation of FFC catalysts

Author

Schuurman, Y., Pantazidis, A., Mirodatos, C., Institut de recherches sur la catalyse (IRC), Centre National de la Recherche Scientifique (CNRS), and IRCELYON, ProductionsScientifiques

Subjects
[CHIM.CATA] Chemical Sciences/Catalysis, [CHIM.CATA]Chemical Sciences/Catalysis
Published
1998

215. The TAP-2 reactor as a new tool for investigating FCC catalysts

Author

Schuurman, Y., Pantazidis, A., Mirodatos, C., IRCELYON, ProductionsScientifiques, Institut de recherches sur la catalyse (IRC), and Centre National de la Recherche Scientifique (CNRS)

Subjects
[CHIM.CATA] Chemical Sciences/Catalysis, [CHIM.CATA]Chemical Sciences/Catalysis
Published
1998

220. A la conquête des temps courts en cinétique chimique

Author

Mirodatos, C., Schuurman, Y., Institut de recherches sur la catalyse (IRC), Centre National de la Recherche Scientifique (CNRS), and IRCELYON, ProductionsScientifiques

Subjects
[CHIM.CATA] Chemical Sciences/Catalysis, [CHIM.CATA]Chemical Sciences/Catalysis
Published
1997

239. Can isotopic transient and formal steady-state kinetics lead to a converging surface chemistry analysis? Case study on the selective reduction of NO by CH4 over Co-ZSM-5 catalysts.

Author

Schuurman, Y., Veen, A., Chupin, C., and Mirodatos, C.

Subjects
CHEMICAL kinetics, CATALYSIS, NITRIC oxide, NITROMETHANE, SURFACE chemistry
Abstract

The surface coverage analysis derived from two formal steady-state kinetic models is compared to values directly obtained from steady-state isotopic transient analysis (SSITKA) for the selective catalytic reduction (SCR) of NO by CH4 over Co-ZSM-5 catalysts. It is shown that the most abundant reacting intermediates are NO x adspecies, though no clear differentiation between the various adspecies identified by DRIFT spectroscopy was achieved. Less numerous carbon containing adspecies were identified and quantified in the reacting system, essentially as methoxy species. Nitromethane-like intermediates remained undetectable due to a very rapid transformation into N2 and CO2. On the basis of these converging kinetic analyses related to each elementary step of the SCR process, a microkinetic model can be derived, which allows describing transient operation, in view of a non steady-state application. [ABSTRACT FROM AUTHOR]

Published
2006
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240. Water-Gas Shift Reaction Kinetics Over µ-Structured Pt/CeO2/Al2 O3Catalysts.

Author

Germani, G. and Schuurman, Y.

Subjects
CHEMICAL reactions, CHEMICAL kinetics, CATALYSTS, WATER-gas, MICROREACTORS
Abstract

Platinum/ceria/alumina catalysts have been prepared in the microchannels of stainless steel platelets. These catalysts are very active for the water-gas shift reaction between 250-400°C. The use of microreactors as kinetic devices has a clear advantage that the thin catalyst film allows the determination of the intrinsic kinetics even in the case of fast reactions. However, the channel design should be such that plug flow conditions are favored. The kinetics of the water-gas shift reaction, free from internal diffusion limitations, have been studied over thin catalyst layers over a large range of operation conditions. The reaction rate is almost zero-order in carbon monoxide and strongly inhibited by the partial pressure of hydrogen and to a lesser extent to that of carbon dioxide. An overall activation energy of 76.8 ± 2 kJ/mol has been measured. The data are best described by a dual-site mechanism, where platinum provides an adsorption site for carbon monoxide and ceria an adsorption site for water. The rate-determining step involves the formation of a complex between a carboxyl species and a hydroxyl group that decomposes over a free platinum site into carbon dioxide and hydrogen. [ABSTRACT FROM AUTHOR]

Published
2006
Full Text
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244. Catalyse acide des vapeurs de pyrolyse du bois

Author

Margeriat, A., Chantal Lorentz, Laurenti, D., Guilhaume, N., Geantet, C., Mirodatos, C., Schuurman, Y., IRCELYON-Ingéniérie, du matériau au réacteur (ING), Institut de recherches sur la catalyse et l'environnement de Lyon (IRCELYON), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), IRCELYON-RMN (RMN), IRCELYON-Catalyse Hétérogène pour la Transition Energétique (CATREN), and IRCELYON, ProductionsScientifiques

Subjects
[CHIM.CATA] Chemical Sciences/Catalysis, [SDE.ES] Environmental Sciences/Environmental and Society, [CHIM.CATA]Chemical Sciences/Catalysis, [SDE.ES]Environmental Sciences/Environmental and Society
Abstract

RMN+ECI2D:ING+AMR:CLO:DLA:NOG:CGE:CMI:YSC; National audience; La pyrolyse du bois est un procédé thermochimique développé pour obtenir des liquides, gaz et solides à partir de biomasse lignocellulosique. Les huiles de pyrolyse obtenues sont toutefois très instables en raison des nombreux composés oxygénés acides et corrosif, et ne peuvent être de ce fait valorisées sans un hydrotraitement sévère et couteux en hydrogène. Une des possibilités pour prétraiter ces huiles est de les hydrogéner à basse température mais ce prétraitement rajoute un coût non négligeable et exige la manipulation des huiles corrosives recondensées. Une autre alternative consiste à utiliser la catalyse couplée à la pyrolyse afin de convertir par craquage certaines molécules et commencer à désoxygéner les huiles. Dans le projet ANR Catapult, nous avons mis au point un réacteur catalytique original qui comporte un lit fixe catalytique situé juste en dessous du réacteur de pyrolyse. La biomasse, du bois de hêtre en copeaux, est injectée régulièrement dans le réacteur et les cendres sont récupérées sur un premier lit avant que les vapeurs ne traversent le lit catalytique. Divers catalyseurs et notamment des zéolites HMFI plébiscistés dans la litérature pour ce genre de procédé ont été testés. Les gaz formés sont analysés en ligne par micro-GC alors que les liquides sont caractérisées par CHONS, RMN, GCxGC et GPC. Il apparait que l'utilisation de 10% pds de catalyseur, et notamment du type M/HMFI avec M=Fe, Ni, Zn, permet de pousser la conversion et de diminuer la teneur en oxygène des huiles. Cela est confirmé par la présence d'aromatiques dans la fraction liquide. Les produits solubles dans la fraction aqueuse (acides, aldéhydes, cétones, sucres) et conduisant à l'instabilité des huiles de pyrolyse ont largement été convertis en gaz (C1-C5, CO2, CO). Les bilans massiques et carbone ont été systématiquement calculés. Durant ce procédé on assiste à la désactivation des catalyseurs dû majoritairement à la formation de coke. Toutefois, les catalyseurs peuvent être régénerés in situ par combustion et réutilisés avec une activité similaire aux solides frais. Ainsi les vapeurs de pyrolyse peuvent être partiellement converties pendant le procédé de pyrolyse sur des catalyseurs de type M/HMFI et conduirent à des huiles de meilleure qualité.

246. Use of hierarchical H-Y zeolite for the Fluid Catalytic Cracking of bio-oil with Vacuum Gas Oil

Author

Yann Chapellière, Tuel, A., Mirodatos, C., Farrusseng, D., Schuurman, Y., IRCELYON-Ingéniérie, du matériau au réacteur (ING), Institut de recherches sur la catalyse et l'environnement de Lyon (IRCELYON), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and IRCELYON, ProductionsScientifiques

Subjects
[CHIM.CATA] Chemical Sciences/Catalysis, [SDE.ES] Environmental Sciences/Environmental and Society, [CHIM.CATA]Chemical Sciences/Catalysis, [SDE.ES]Environmental Sciences/Environmental and Society
Abstract

SSCI-VIDE+ING+YCP:ATU:CMI:DFA:YSC; International audience; Fluid Catalytic Cracking (FCC) gasoline represents one third of the global gasoline pool. In order to meet objectives regarding increased renewable share in transportation fuels, production of a hybrid bio/fossil fuel by co-refining biomass pyrolysis liquids with crude oil fractions in a conventional oil refinery, is an achievable approach [1]. However, oxygenated molecules, typical for the bio-feedstock, are still present in pyrolytic liquids. For high oxygenated molecule content, co-refining may lead to severe changes in products quality, such as a higher aromaticity and residual oxygenates in the hybrid fuels that are produced. In order to adjust the reactivity of FCC catalysts, Y zeolites have been upgraded by creating an additional mesoporosity. The aim of this mesopore network is to improve the diffusion of the large lignocellulosic fragments throughout the catalytic cracking catalysts.Hierarchical H-Y zeolites were prepared according to post synthetic processes performed on commercial CBV720 from Zeolyst [2, 3]. Three catalysts with well distinct multilevel pore networks were tested on a MAT catalytic test bench. The addition of 10% of bio-oil to the VGO into the feed led to a small decrease of naphtha yield. The analysis of liquid products by GC 2D revealed the presence of phenols as residual oxygenated components. Peaks of sugars and acids were not identified contrary to what had been seen for the bio-oil before the processing in the MAT test. The main difference of selectivity between the three materials was the coke yield (Figure 1.A). H-Y1 and H-Y2, were unexpected to achieve higher coke yield than CBV720 since higher mesopore volumes were found (Figure 1.B). However, the post synthetic modifications of CBV720 induced structure rearrangement [2]. The progressive disappearance of the large mesopore-macropores observed on CBV720 (Figure 1.C-E) explained the aforesaid coke production.It is highlighted that the pore structure of the hierarchical zeolites plays a key role for the co-processing of bio-oil with VGO. Catalytic cracking of model molecules on the presented materials will be presented in order to identify the roles of oxygenates on catalytic performances.

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