Partial oxidation of methane by O2 and N2O to syngas over yttrium-stabilized ZrO2 (2006)
Zhu, Jianjun, Ommen Van, J.G., Lefferts, L.
Catalytic partial oxidation of methane to synthesis gas over ZrO2 and yttrium-stabilized zirconia (YSZ) is studied using O2 and N2O as oxidants. ZrO2 is much more active than YSZ in oxidation of...
Zhu, J.J., Ommen Van, J.G., Lefferts, L.
The influence of water and surface hydroxyl groups on the catalytic performance of yittrium-stabilized ZrO2 (YSZ) in the partial oxidation of methane to synthesis gas was investigated using FT-IR as...
Zapirtan, V.I., Mojet, B.L., Ommen Van, J.G., Spitzer, J., Lefferts, L.
The heterogeneously catalysed gas phase hydroformylation of ethylene to propionaldehyde was studied over solid RhCl(PPh3)3 and RhCl(CO)(PPh3)2. At 3 bar and 185 °C, an active phase formed from...
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...
Zhu, J.J., Ommen Van, J.G., Lefferts, L.
Operation of partial oxidation of methane to synthesis gas over yttrium-stabilized zirconia (YSZ) at very high temperatures (¿900°C) slightly improves the selectivity to synthesis gas, which is...
Xu, Jiang, Mojet, B.L., Ommen Van, J.G., Lefferts, L.
The desorption of products from a series of alkaline-earth exchanged Y zeolites after room-temperature propane selective oxidation was investigated by in situ infrared and mass spectroscopy. The...
Jarrah, Nabeel A., Ommen Van, J.G., Lefferts, L.
Washcoats with improved mass transfer properties are necessary to circumvent concentration gradients in case of fast reactions in liquid phase, e.g. nitrate hydrogenation. A highly porous, high...
Deoxygenation of benzoic acid on metal oxides. 2. Formation of byproducts. (2002)
Lange De, M.W., Ommen Van, J.G., Lefferts, L.
Benzene, benzophenone, toluene and benzylalcohol are byproducts in the selective deoxygenation of benzoic acid to benzaldehyde on ZnO and ZrO2. In this paper, the pathways to the byproducts are...
Deoxygenation of benzoic acid on metal oxides. I. The selective pathway to benzaldehyde (2001)
Lange De, M.W., Ommen Van, J.G., Lefferts, L.
The mechanism of the selective deoxygenation of benzoic acid to benzaldehyde was studied on ZnO and ZrO2. The results show conclusively that the reaction proceeds as a reverse type of Mars and van...
Sorption of methanol in alkali exchange zeolites (2000)
Rep, M., Palomares, A.E., Ommen Van, J.G., Lefferts, L., Lercher, J.A.
Metal cation methanol sorption complexes in MFI (ZSM5), MOR and X have been studied by in situ i.r. spectroscopy in order to understand the nature of interactions of methanol in the molecular sieve...
Pore Structure Evolution of Lanthana–Alumina Systems Prepared through Coprecipitation (2000)
Nair, Jalajakumari, Nair, P., Mizukami, Fujio, Ommen Van, J.G., Doesburg, Giel B.M., Ross, J.R.H., ...
Pure Al2O3 and different compositions of La2O3–Al2O3 samples have been prepared through coprecipitation. Even after heating at 1300°C, the compositions La2O3·11Al2O3 and La2O3·13Al2O3 had higher...
Sintering of Lanthanum Zirconate (1999)
Nair, Jalajakumari, Nair, P., Doesburg, Giel B.M., Ommen Van, J.G., Ross, J.R.H., Burggraaf, A.J., ...
Lanthanum zirconate (La2Zr2O7) was prepared by coprecipitating lanthanum nitrate and zirconyl oxychloride at pH 10, followed by ethanol washing. The initial high surface area of 304 m2·g−1...
Nair, Jalajakumari, Nair, P., Ommen Van, J.G., Ross, J.R.H., Burggraaf, A.J., Mizukami, Fujio
Alkoxide-derived boehmite precipitates were subjected to different post-precipitation treatments to obtain a peptized sol, an unpeptized slurry, and an ethanol-washed gel precipitate. These materials...
Bitter, J.H., Hally, W., Seshan, K., Ommen Van, J.G., Lercher, J.A.
Pt supported on ¿-Al2O3, TiO2 and ZrO2 are active catalysts for the CO2 reforming of methane to synthesis gas. The stability of the catalysts increased in the order Pt/¿-A12O3 < Pt/TiO2 < Pt/ZrO2....
Nickel catalysts for internal reforming in molten carbonate fuel cells (1996)
Berger, R.J., Doesburg, E.B.M., Ommen Van, J.G., Ross, J.R.H.
Natural gas may be used instead of hydrogen as fuel for the molten carbonate fuel cell (MCFC) by steam reforming the natural gas inside the MCFC, using a nickel catalyst (internal reforming). The...
Investigation of Alkali Carbonate Transport Toward the Catalyst in Internal Reforming MCFCs (1996)
Berger, R.J., Doesburg, E.B.M., Ommen Van, J.G., Ross, J.R.H.
A nickel catalyst to be used for internal steam reforming in a molten carbonate fuel cell (MCFC) must be resistant to the alkali components (Li and K species) of the electrolyte; these components can...
Oxidative coupling of methane over doped Li/MgO catalysts (1994)
Hoogendam, G.C., Seshan, K., Ommen Van, J.G., Ross, J.R.H.
A series of zirconia doped Li/MgO catalysts with a fixed amount of zirconia and varying concentrations of lithium was used for the oxidative coupling of methane. It was found that an increase in...
Swaan, H.M., Li, X., Seshan, K., Ommen Van, J.G., Ross, J.R.H.
The promoting effect of niobium in a Li/MgO catalyst for the oxidative coupling of methane (OCM) and for the oxidative dehydrogenation of ethane (ODHE) has been studied in some detail. It has been...
The selective reduction of NOx with NH3 over zirconia-supported vanadia catalysts (1993)
Szakacs, S., Altena, G.J., Fransen, T., Ommen Van, J.G., Ross, J.R.H.
A series of sub-monolayer vanadia-on-zirconia catalysts have been prepared and the activities of these have been measured for the selective reduction of NO with NH3. It has been found that the...
Xue, E., Seshan, K., Ommen Van, J.G., Ross, J.R.H.
The catalytic oxidation of nitric oxide to nitrogen dioxide in the presence of sulphur dioxide over a standard Pt/SiO2 catalyst (EuroPt-1) was studied. The gas-phase reactions between nitric oxide,...
Slaa, J.C., Weierink, G.J.M., Ommen Van, J.G., Ross, J.R.H.
The influence of different promoters (CeO2, MnOx, K2CO3) on various properties of a standard coprecipitated Cu/ZnO/Al2O3 catalyst has been examined. The catalysts prepared were characterized by Cu...
The synthesis of higher alcohols using modified Cu/ZnO/Al2O3 catalys (1992)
Slaa, J.C., Ommen Van, J.G., Ross, J.R.H.
This paper gives a review of research work in the synthesis of higher alcohols over catalysts based on Cu/ZnO/Al2O3, emphasizing three main topics: (i) the effect on selectivity of the addition of...
Swaan, H.M., Toebes, A., Seshan, K., Ommen Van, J.G., Ross, J.R.H.
The oxidative dehydrogenation of ethane was studied with the use of promoted Li/MgO catalysts at temperatures of 600¿650°C. The addition of known promoters, cobalt and tin, gave a slight Increase...
Swaan, H.M., Toebes, A., Ommen Van, J.G., Seshan, K., Ross, J.R.H.
Kinetic and mechanistic aspects of the oxidative dehydrogenation of ethane catalysed by Li/MgO and Li/Na/MgO have been investigated. Initial rate measurements at 600°C; revealed that the Li/MgO...
Mercera, P.D.L., Ommen Van, J.G., Doesburg, E.B.M., Burggraaf, A.J., Ross, J.R.H.
A single-phase monoclinic zirconia (the thermodynamically stable modification up to a temperature of 1170°C), having a specific surface area of 67 m2g¿1 and a well-developed mesoporous texture, has...
Mercera, P.D.L., Ommen Van, J.G., Doesburg, E.B.M., Burggraaf, A.J., Ross, J.R.H.
Single-phase tetragonal zirconium oxides have been made by the incorporation of 5.4 mol-% of Y3+ or La3+ in ZrO2 to form solid solutions. The samples were prepared by controlled coprecipitation from...
The silver-oxygen interaction in relation to oxidative dehydrogenation of methanol (1987)
Lefferts, L., Ommen Van, J.G., Ross, J.R.H.
The interaction of unsupported silver with oxygen at atmospheric pressure and at temperatures between 100 and 600°C has been studied using temperature programmed reduction and desorption experiments...
Lefferts, L., Ommen Van, J.G., Ross, J.R.H.
The interaction of an unsupported silver catalyst which had been pretreated by hydrogen at various temperatures with oxygen at 210°C has been studied using Temperature Programmed Reduction (TPR)...
Feil, F.S., Ommen Van, J.G., Ross, J.R.H.
The oxidation of methanol on a Vz06/Ti02m onolayer catalyst was studied by infrared spectroscopy using transmittance and diffuse-reflectance cells. Methanol was adsorbed on the catalyst surface at...
Lefferts, L., Ommen Van, J.G., Ross, J.R.H.
The properties of silver in the oxidative dehydrogenation of methanol were studied in a flow reactor under near industrial conditions. The influences of temperature, concentration of both reactants,...