• Article dans une revue

Role of oxygen vacancies in the basicity of ZnO: From the model methylbutynol conversion to the ethanol transformation application

C. Drouilly, J.M. Krafft, F. Averseng, H. Lauron-Pernot, Delphine Bazer-Bachi, Céline Chizallet, V. Lecocq, Guylène Costentin

The parameters governing the basic reactivity of kadox and ex-carbonate zinc oxide samples towards alcohol conversion were investigated varying the atmosphere of pre-treatment for a model reaction, the methylbutynol (MBOH) conversion, and the ethanol conversion reaction, a transformation of…

Applied Catalysis A : General, 2012, 453, pp.121-129. ⟨10.1016/j.apcata.2012.11.045⟩. ⟨hal-00811509⟩

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Influence of the nitric acid treatment on Al removal, framework composition and acidity of BEA zeolite investigated by XRD, FTIR and NMR

Rafal Baran, Yannick Millot, Thomas Onfroy, Jean-Marc Krafft, Stanislaw Dzwigaj

Two different procedures were used to prepare dealuminated BEA zeolite. The first procedure realized in two steps consisted of first calcination of original tetraethylammonium (TEA) BEA(17) zeolite in air at 823 K for 15 h to remove organic template and then treatment of as resulted organic-free…

Microporous and Mesoporous Materials, 2012, 163, pp.122-130. ⟨10.1016/j.micromeso.2012.06.055⟩. ⟨hal-00744716⟩

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NMR cogwheel phase cycling determination with web tools: Amplitude-modulated z-filter MQMAS sequence

Yannick Millot, Redouane Hajjar, Pascal P. Man

Our recent method based on the use of web tools (XML and XSLT) for constructing cogwheel phase cycles is extended to the selection of two sym. coherence transfer pathways in the case of an amplitude-modulated z-filter MQMAS sequence. For all spins (I=3/2, 5/2, 7/2 and 9/2) and all MQ expts. we…

Solid State Nuclear Magnetic Resonance, 2010, 38 (1), pp.19-26. ⟨10.1016/j.ssnmr.2010.06.001⟩. ⟨hal-00604781⟩

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Light olefin transformation over ZSM-5 zeolites with different acid strengths - A kinetic model

P. Oliveira, P. Borges, R. Ramos Pinto, M. A. N. D. A. Lemos, F. Lemos, Jacques C. Vedrine, F. Ramoa Ribeiro

The authors analyzed the influence of the acidity of a ZSM-5 catalyst on the catalytic transformation of various short-chain olefins (ethylene, propylene and 1-butene). Four ZMS-5 catalysts with different acid strength distributions were studied at different temps. and partial pressures. The…

Applied Catalysis A : General, 2010, 384 (1-2), pp.177-185. ⟨10.1016/j.apcata.2010.06.032⟩. ⟨hal-00604786⟩

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Extension of a kinetic model for NO oxidation and NOx storage to fixed-bed Pt/Ba/Al2O3 catalysts

Nikola Rankovic, Andre Nicolle, David Berthout, Patrick da Costa

Following our work on modeling of monolith catalysts, we herein focus on developing a fixed-bed reactor model in the AMESim modeling platform. A kinetic model for NO oxidn. and NOx storage over Pt/Ba/Al2O3 recently developed in the literature was successfully implemented and validated against the…

Catalysis Communications, 2010, 12 (1), pp.54-57. ⟨10.1016/j.catcom.2010.07.012⟩. ⟨hal-00604793⟩

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CO- and N2-FTIR Characterisation of Oxidised Rhodium Species Supported on Ce0.68Zr0.32O2

Céline Fontaine-Gautrelet, Jean-Marc Krafft, Olivier Gorce, Françoise Villain, Gérald Djéga-Mariadassou, Cyril Thomas

The identification of Rh oxidised species of a Rh(0.29)/Ce0.68Zr0.32O2 catalyst, exhibiting peculiar CO-O2 kinetics [Manuel et al., J. Catal. 2004, 224, 269], is addressed. For this purpose, various catalysts are studied by XANES, CO- and N2-FTIR, and benzene hydrogenation. The results obtained,…

Physical Chemistry Chemical Physics, 2006, 8, pp.3732-3740. ⟨10.1039/b601926a⟩. ⟨hal-00091039⟩

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Evidence for Rh electron-deficient atoms (Rhdelta+) as the catalytic species for CO oxidation when supported on Ce0.68Zr0.32O2: a combined N2-FTIR, benzene hydrogenation and kinetic study

Céline Fontaine-Gautrelet, Jean-Marc Krafft, Gérald Djéga-Mariadassou, Cyril Thomas

The characterization of two low-loaded Rh(wt%)/Ce0.68Zr0.32O2 samples (Rh(0.29)/CZ and Rh(0.32)/CZ) was performed via N2-FTIR and benzene hydrogenation before being investigated for CO oxidation activity and kinetics. N2-FTIR allows characterization of both RhΔ+ (νN2 = 2295 cm-1) and Rh0 (νN2 =…

Journal of Catalysis, 2007, 247, pp.34-42. ⟨10.1016/j.jcat.2007.01.005⟩. ⟨hal-00157019⟩

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Kinetic study of the hydrodesulfurization of dibenzothiophene over molybdenum carbides supported on functionalized carbon black composite Influence of indole

A. Hynaux, Celine Sayag, S. Suppan, J. Trawczynski, M. H. Lewandowski, A. Szymanska-Kolasa, G. Djéga-Mariadassou

Different carbon black composite (CBC) supported molybdenum carbides were synthesized. The support was functionalized with nitric acid at different pH of the impregnation solution (pH 5.2; 0), in order to improve the active phase dispersion. After characterization of these supported catalysts, the…

Applied Catalysis B: Environmental, 2006, 72, pp.62-70. ⟨10.1016/j.apcatb.2006.09.019⟩. ⟨hal-00128025⟩

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Hydrodenitrogenation of indole over Mo2C catalyst: Insights into mechanistic events through DFT modeling

Witold Piskorz, Grzegorz Adamski, Andrzej Kotarba, Zbigniew Sojka, Céline Sayag, G. Djéga-Mariadassou

The molecular reaction mechanism of hydrodenitrogenation of indole was studied using density-functional theory calculations of the adsorbed o-ethylaniline surrounded by mobile hydrogen atoms. It was found that the hydrogenation of o-ethylaniline occurs through two steps: consisting in…

Catalysis Today, 2006, 119, pp.39-43. ⟨10.1016/j.cattod.2006.08.050⟩. ⟨hal-00128043⟩

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Characterization of Mo2C-WO2 composite catalysts for bifunctional isomerization: a new pulse method to quantify acid sites

Claude Potvin, Anne-Félicie Lamic Chae-Ho Shin Gérald Djega-Mariadassou Claude Potvin

Applied Catalysis A : General, 2006, 302, pp.5. ⟨10.1016/j.apcata.2005.12.006⟩. ⟨hal-00022217⟩