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De Jong K.P.,University Utrecht | Zecevic J.,University Utrecht | Friedrich H.,University Utrecht | De Jongh P.E.,University Utrecht | And 6 more authors.
Angewandte Chemie - International Edition | Year: 2010

Working at the Y: Zeolite Y crystals with micropores (ca. 1 nm), small mesopores (ca. 3 nm), and large mesopores (ca. 30 nm) were obtained by base leaching of previously steamed and acid-leached material. The zeolite Y crystals with trimodal porosity (see electron-tomographic picture) displayed close to ideal hydrocracking selectivity and enhanced yields of kerosene and diesel. Copyright © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Le Guludec E.,University of Caen Lower Normandy | Le Guludec E.,Air Liquide | Oliviero L.,University of Caen Lower Normandy | Gilson J.P.,University of Caen Lower Normandy | And 5 more authors.
Catalysis Science and Technology | Year: 2015

During the sulfidation of hydrotreating catalysts under a H2S/H2 flow, the conversion of carbonyl sulfide (COS), present as an impurity, allows one to determine the starting and ending temperatures of the formation of the active sulfide phase. This new and simple method is validated by comparing it with CO adsorption monitored by IR spectroscopy for two CoMo catalysts sulfided either after calcination or after drying. Both methods show that the formation of CoMoS sites occurs at higher temperature when the catalyst is dried instead of calcined before the sulfidation. © The Royal Society of Chemistry 2015.


Le Guludec E.,University of Caen Lower Normandy | Le Guludec E.,Total Research Center Feluy | Oliviero L.,University of Caen Lower Normandy | Gilson J.P.,University of Caen Lower Normandy | And 4 more authors.
Catalysis Letters | Year: 2012

A side by side characterization of gas and liquid phase activation of a CoMo/Al 2O 3 hydrodesulfurization (HDS) catalyst is reported using thiophene HDS as a test reaction and CO adsorption monitored by infrared spectroscopy. The liquid phase sulfidation (high pressure, dimethyldisulfide) leads to the formation of CoMoS sites with higher intrinsic activity compared to the gas phase (H 2S/H 2). © 2012 Springer Science+Business Media, LLC.


De Jong K.,University Utrecht | De Jong K.,Total Research Center Feluy | De Jong K.,Charles Gerhardt Institute | Zecevic J.,University Utrecht | And 26 more authors.
ACS National Meeting Book of Abstracts | Year: 2011

We have obtained zeolite Y crystals with micropores (∼ 1 nm), small mesopores (∼ 3 nm) and large mesopores (∼ 30 nm) by base leaching of previously steamed and acid-leached material. The large mesopores were already present in the starting material while the small mesopores were created upon base leaching. The truly hierarchical nature of the pore network was deduced by combining physisorption and electron tomography results. These zeolite Y crystals with trimodal porosity displayed close to ideal hydrocracking selectivity for n-hexadecane and squalane feedstocks. Moreover, in the hydrocracking of vacuum gas oil, the yield in middle distillates was enhanced by about 10 %. The reported method to obtain zeolite Y with trimodal porosity is industrially viable and its further development for hydrocracking catalysis is in progress.

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