Drop impact upon micro- and nanostructured superhydrophobic surfaces (2009)
Tsai, Peichun, Pacheco, Sergio, Pirat, Christophe, Lefferts, Leon, Lohse, Detlef
We experimentally investigate drop impact dynamics onto different superhydrophobic surfaces, consisting of regular polymeric micropatterns and rough carbon nanofibers, with similar static contact...
Trionfetti, Cristiano, Babich, Igor V., Seshan, K., Lefferts, Leon
The surface morphology of Li-promoted MgO catalysts prepared using the sol−gel method (sg) and wet impregnation procedure (imp), respectively, has been studied by low-temperature infrared...
Ebbesen, Sune D., Mojet, Barbara L., Lefferts, Leon
In relation to the heterogeneous hydrogenation of nitrite, adsorption of NO2-, NH4+, and NH2OH from the aqueous phase was examined on Pt/Al2O3, Pd/Al2O3, and Al2O3. None of the investigated inorganic...
Graf, Patrick O., Mojet, Barbara L., Lefferts, Leon
effect of addition of potassium to Pt supported on yttrium-stabilized zirconia (PtYSZ) catalyst for steam reforming of methane, ethane and methane/ethane mixtures was explored. Addition of potassium...
Graf, Patrick O., Mojet, Barbara L., Ommen Van, Jan G., Lefferts, Leon
In the present paper steam reforming of methane, ethane and ethylene was compared on Pt, Rh and Pd supported on yttrium-stabilized zirconia (YSZ). Both reactivity and product distribution changed...
Ebbesen, Sune D., Mojet, Barbara L., Lefferts, Leon
Adsorption of carbon monoxide and oxidation of preadsorbed carbon monoxide from gas and aqueous phases were studied on a platinum catalyst deposited on a ZnSe internal reflection element (IRE) using...
Xu, Jiang, Mojet, Barbara L., Lefferts, Leon
The effects of zeolite geometry on propane selective oxidation were studied by in situ infrared spectrometry on Ca2+ exchanged Y, MOR and ZSM5 zeolites. Oxygen and propane adsorption at room...
Jarrah, Nabeel A., Ommen Van, Jan G., Lefferts, Leon
This paper describes the catalytic formation of a layer of carbon nanofibers (CNFs) on Ni foam, resulting in a new catalytic route for preparing thin, highly macroporous layers. The effect of...
Zhu, Jianjun, Ommen Van, Jan G., Knoester, A., Lefferts, Leon
Catalytic partial oxidation of methane to synthesis gas (CPOM) over yttrium-stabilized zirconia (YSZ) was studied within a wide temperature window (500¿1100 °C). The catalysts were characterized by...
Non-conventional oxidation catalysis (2005)
Lefferts, Leon, Seshan, K., Mojet, Barbara L., Ommen Van, Jan
This short review provides an overview as well as background of ongoing work in our laboratory on unconventional catalysts in selective oxidation reactions with remarkable selectivity. The three...
Jarrah, Nabeel A., Li, Fahong, Ommen Van, Jan G., Lefferts, Leon
This work describes the preparation of new materials based on immobilizing carbon nanofibres (CNFs) on the surface of Ni foam. CNFs were catalytically synthesized by decomposition of ethene over the...
Role of surface defects in activation of O2 and N2O on ZrO2 and yttrium-stabilized ZrO2. (2005)
Zhu, Jianjun, Albertsma, Sander, Ommen Van, Jan G., Lefferts, Leon
The relationship between the structure of both yttrium-stabilized zirconia (YSZ) and ZrO2 catalysts and their ability to activate N2O and O2 is studied by determination of catalytic properties and...
Xu, Jiang, Mojet, Barbara L., Ommen Van, Jan G., Lefferts, Leon
The importance of Brønsted acid sites for partial oxidation of propane to acetone in CaY was investigated by in situ FTIR spectroscopy. With an increasing number of protons in Ca-Y, Volcano plots...
Zhu, Jianjun, Ommen Van, Jan G., Bouwmeester, Henny J.M., Lefferts, Leon
The isotopic exchange reaction on ZrO2 and yttrium-stabilized ZrO2 (YSZ) during catalytic partial oxidation of methane to synthesis gas (CPOM) was studied with transient pulse experiments. The...
Xu, Jiang, Mojet, Barbara L., Ommen Van, Jan G., Lefferts, Leon
The adsorption of oxygen and d2-propane (CH3CD2CH3) on a series of alkaline-earth-exchanged Y zeolite at room temperature was studied with in situ infrared spectroscopy. Surprisingly at room...
Xu, Jiang, Mojet, Barbara L., Ommen Van, Jan G., Lefferts, Leon
The activity of CaNaY zeolites in selective oxidation of propane with increasing Ca2+ content at room temperature was studied with infrared spectroscopy and ammonia temperature-programmed desorption....
Jarrah, Nabeel A., Ommen Van, Jan G., Lefferts, Leon
This work describes how a new, extremely porous, hairy layer of carbon nano-fibers (CNFs) can be prepared on the surface of porous inorganic bodies, e.g. wash-coated monoliths. CNFs were prepared...
Dual catalyst bed concept for catalytic partial oxidation of methane to synthesis gas (2004)
Zhu, J., Ommen Van, J.G., Lefferts, Leon
A system with two catalyst beds instead of one single metal catalyst bed is proposed for catalytic partial oxidation of methane (CPOM) to synthesis gas. In this dual catalyst bed system, an...
Selective removal of NO2 in the presence of oxygen and NO over Pd/SiO2 catalysts (2004)
Li, Mingshi, Seshan, K., Lefferts, Leon
Catalytic reduction of NO2 in the presence of excess oxygen and NO has been studied over a 0.2% Pd/SiO2 catalyst between 120 and 260 °C. CO is effective in selective reduction of NO2 at temperatures...
Sustainable hydrogen from bio-oil - Steam reforming of acetic acid as a model oxygenate (2004)
Takanabe, Kazuhiro, Aika, Ken-ichi, Seshan, K., Lefferts, Leon
Steam reforming of acetic acid over Pt/ZrO2 catalysts has been investigated. Pt/ZrO2 catalysts are very active, completely converting acetic acid, and give a hydrogen yield close to thermodynamic...
Zhu, Jianjun, Ommen Van, Jan G., Lefferts, Leon
The partial oxidation of methane to synthesis gas over yttrium-stabilized zirconia (YSZ) was studied with in situ FTIR and both steady-state and transient experiments. The four major products, CO,...
Xu, Jiang, Mojet, Barbara L., Ommen Van, Jan G., Lefferts, Leon
The effect of zeolite Y ion-exchanged with a series of alkaline-earth cations on selective propane oxidation at room temperature was studied with in situ infrared spectroscopy. Isopropylhydroperoxide...
Furusawa, Takeshi, Lefferts, Leon, Seshan, Kulathuiyer, Aika, Ken-ichi
The selective reduction of NO (0.1%) with propylene (0.1%) in the presence of oxygen (5%) was studied using two Ag catalysts (Ag-ZSM5, Ag/Al2O3) in view of the reaction mechanism within the...
Furusawa, Takeshi, Seshan, Kulathuiyer, Lefferts, Leon, Aika, Ken-ichi
Selective reduction of NO with propylene in the presence of oxygen was carried out over Co ion-exchanged HY zeolites (Si/Al=2.55, 20) and Co-Pt combination catalysts based on HY zeolite (Si/Al=2.55)....
Selective reduction of NO to N2 in the presence of oxygen over supported silver catalysts (2002)
Furusawa, Takeshi, Seshan, Kulathuiyer, Lercher, Johannes A., Lefferts, Leon, Aika, Ken-ichi
Selective reduction of NO (0.1%) with propylene (0.1%) in the presence of oxygen (5%) with He balance was carried out over Ag supported on Al2O3, H-ZSM5 and H-Y catalysts. Although their activities...
Oxidative conversion of light alkanes to olefins over alkali promoted oxide catalysts. (2002)
Leveles, Laszlo, Fuchs, Stefan, Seshan, Kulathuiyer, Lercher, Johannes A., Lefferts, Leon
Alkali promoted mixed oxides were studied as catalysts for the oxidative dehydrogenation (ODH) and cracking of butane and propane. Olefin yields as high as 50% were obtained with Li/MgO-based...
Oxidative dehydrogenation and cracking of ethane and propane over LiDy Mg mixed oxides (2001)
Fuchs, Stefan, Leveles, L., Seshan, K., Lefferts, Leon, Lemonidou, Angeliki, Lercher, Johannes A.
The oxidative dehydrogenation and cracking of ethane and propane over LiDyMg mixed oxides is reported. High yields of olefins and only moderate formation of carbon oxides was observed. Both are...