Impact of supported ionic liquids on supported Pt catalysts (2009)
R. Knapp, A. Jentys, J.A. Lercher
Journal article
M.F. Williams, B. Fonfe, C. Sievers, A. Abraham, J.A. VanBokhoven, ...
Journal article
M.F. Williams, B. Fonfe, C. Woltz, A. Jentys, ...
Journal article
Bodis, J., Lefferts, L., Muller, T.E., Pestman, R., Lercher, J.A.
Approaches to control selectivity and activity in the catalytic reductive amination of butyraldehyde with ammonia over carbon supported noble metal catalysts (Ru, Rh, Pd, and Pt) were explored....
Maisuls, S.E., Lefferts, L., Seshan, K., Furusawa, T., Aika, K., Mosqueda Jimenez, B., ...
Kinetic and in situ spectroscopic studies of Co¿Pt/MFI and Co¿Pt/HY catalysts for the selective reduction of NOx with propylene in the presence of oxygen were carried out. The results of catalytic...
Leveles, L., Seshan, K., Lercher, J.A., Lefferts, L.
Activation of propane over Li/MgO catalyst has been investigated. It is shown that a small fraction of the oxygen ions in Li/MgO catalysts can be removed from the catalyst by reduction treatment in...
Leveles, L., Seshan, K., Lercher, J.A., Lefferts, L.
Oxidative conversion of lower alkanes over lithium-promoted magnesia catalysts offers a viable alternative for propene and ethene production. The catalytic performance of propane oxidative...
Micro-structured steam reformer for hydrogen generation for fuel cell applications. (2003)
Cremers, C., Stimming, U., Find, J., Lercher, J.A., Reuse, P., Renken, A., ...
Achema 2003 : 27.Internat.Kongress für Chemische Technik, Umweltschutz und Biotechnologie, Frankfurt, 19.-24.Mai 2003
Cremers, C., Stimming, U., Find, J., Lercher, J.A., Haas-Santo, K., Görke, O., ...
9th NICE Workshop: High Temperature Catalysis, Durdent Court, Denham, GB, February 11-12, 2003
Micro-structured reactors for coupled steam-reforming and catalytic combustion of methane. (2003)
Cremers, C., Stummer, M., Stimming, U., Find, J., Lercher, J.A., Kurtz, O., ...
7th Internat.Conf.on Microreaction Technology (IMRET-7), Lausanne, CH, September 7-10, 2003
Micro-structured steam reformers as flexible hydrogen generators for fuel cell systems. (2003)
Cremers, C., Stimming, U., Find, J., Lercher, J.A., Reuse, P., Renken, A., ...
Fuel Cell Seminar, Miami, Fla., November 3-6, 2003
Selective reduction of NO to N2 in the presence of oxygen over supported silver catalysts (2002)
Furusawa, T., Seshan, K., Lercher, J.A., Lefferts, L., Aika, K.
Meunier, F.C., Domokos, L., Seshan, K., Lercher, J.A.
The sorption and reaction of but-1-ene over a ferrierite sample was studied by in situ IR spectroscopy to relate the selectivity to isobutene and the sorbed species. The spectra highlighted the...
Comparison of heating methods for micro-structured steam-reformers. (2002)
Cremers, C., Stimming, U., Find, J., Lercher, J.A., Goerke, O., Hass-Santo, K.
Fuel Cells : Science and Technology 2002, Amsterdam, NL, September 25-26, 2002
Directly fired micro-structured methane steam-reformer for fuel cell systems. (2002)
Cremers, C., Stimming, U., Find, J., Lercher, J.A., Haas-Santo, K., Görke, O., ...
Fuel Cells - Reliable, Clean Energy for the World : 2002 Fuel Cell Seminar, Palm Springs, Calif., November 18-21, 2002
Koningsberger, D.C., Bokhoven, J.A. Van, Tromp, M., Miller, J.T., Pieterse, J.A.Z., Lercher, J.A., ...
This paper presents a catalytic, spectroscopic, calorimetric study of mildly steam-dealuminated mordenite (H-MOR). With increasing steam partial pressures at 673 K there is increasing dealumination,...
Selective reduction of NO to nitrogen in the presence of oxygen (2001)
Furusawa, T., Seshan, K., Maisuls, S.E., Lercher, J.A., Lefferts, L., Aika, K.
Applied molecular simulations over FER-, TON- and AEL-type zeolites (2001)
Domokos, L., Lefferts, L., Seshan, K., Lercher, J.A.
Interaction and transport of representative (un)saturated hydrocarbon molecules involved in the proposed reaction network of n-butene isomerization in zeolites FER, TON, and AEL have been studied by...
Domokos, L., Lefferts, L., Seshan, K., Lercher, J.A.
Transformation of linear butenes and iso-butene was carried out over H-FER (Si/Al ratio of 8) in a wide temperature and pressure range and with varying contact times. Catalyst lifetime over 100 h...
The importance of acid site locations for n-butene skeletal isomerization on ferrierite (2000)
Domokos, L., Lefferts, L., Seshan, K., Lercher, J.A.
The role of the previous termacid site locationnext term in H-ferrierite (H-FER) on the skeletal isomerization of linear butenes was studied. Assignment of OH groups observed in FTIR analysis is...
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...
Deactivation and Coke Accumulation during CO2/CH4 Reforming over Pt Catalysts (1998)
Bitter, J.H., Seshan, K., Lercher, J.A.
The Deactivation of Pt catalysts used in the generation of synthesis gas via CO2/CH4 reforming depends strongly on the support and the metalparticle size. Methods of Physicochemical characterization...
Design of Stable Catalysts for Methane-Carbon Dioxide Reforming (1998)
Seshan, K., Bitter, J.H., Lercher, J.A.
PtZrO2 is an active and stable catalyst for methane- carbon dioxide reforming reaction. The reaction between CO2 and CH4 to yield synthesis gas might proceed vie two different pethways. At high...
Alkylation of Toluene over Basic Catalysts—Key Requirements for Side Chain Alkylation (1998)
Palomares, A.E., Eder-Mirth, G., Rep, M., Lercher, J.A.
In situinfrared spectroscopy was used to study sorption and reaction of toluene and methanol over various basic catalysts (MgO, hydrotalcites, and basic zeolites). The size of the metal cations...
Mono and bifunctional pathways of CO2/CH4 reforming over Pt and Rh based catalysts (1997)
Bitter, J.H., Seshan, K., Lercher, J.A.
Despite the high thermodynamic driving force to form coke under the reaction conditions applied Pt/ZrO2 and Rh supported on y-Al2O3 and ZrO2 are active and stable catalysts for CO2/CH4 reforming....
The state of Zirconia Suported Platinum Catalysts for CO2/CH4 Reforming (1997)
Bitter, J.H., Seshan, K., Lercher, J.A.
In Pt/ZrO2 catalysts used for CO2/CH4 reforming to syngas, not all accessible Pt contributes equally to the activity of the catalyst. The cataalytic activity is determined by the accessibility of Pt...
Sorption and activation of hydrocarbons by molecular sieves (1997)
Substantial progress has been made recently in the understanding of sorption and activation of alkanes. This progress reflects the emergence of new theoretical and experimental results, leading to a...
Distinct molecular ordering of sorbed alkanes is observed in MFI zeolites when the chain length of the alkane is similar to the length of the zig-zag channels (i.e., with n-hexane and n-heptane). In...
Structure sensitivity of the hydrogenation of crotonaldehyde over Pt/SiO2 and Pt/TiO2 (1997)
Englisch, M., Jentys, A., Lercher, J.A.
Hydrogenation of crotonaldehyde has been studied over SiO2- and TiO2-supported Pt catalysts. Over Pt/SiO2, the selectivity to the primary products butyraldehyde and crotylalcohol depends critically...
Improving the stability of H-mordenite for n-butane isomerization (1997)
Asuquo, R.A., Mirth, G.C., Seshan, K., Pieterse, J.A.Z., Lercher, J.A.
The conversion ofn-butane over mordenite-based catalysts in the presence of hydrogen and water was investigated for reaction temperatures between 523 and 623 K. Special attention was given to the...
Palomares Gimeno, A.E., Mirth, G.C., Lercher, J.A.
In situinfrared spectroscopy was used to study the sorption and reaction of toluene and methanol over various alkali exchanged X zeolites. The size of the metal cations controls the preference of...
Hydrogenation of crotonaldehyde over Pt based bimetallic catalysts (1997)
Englisch, M., Ranade, V., Lercher, J.A.
Gas and liquid phase hydrogenation of crotonaldehyde was studied over silica supported promoted Pt catalysts. The influence of reaction temperature and reactant pressure on the activity and...
In situ FT-IR microscopic investigationof metal substituted AIPO4-5 single crystals (1997)
Müller, G.A., Bodis, E., Mirth, G.C., Kornatowski, J., Lercher, J.A.
First direct spectroscopic evidence for the existence of Brønsted acid sites in AlPO4-5 (AFI) single crystal molecular sieves substituted with divalent metal cations is reported. Ammonia and...
The state of zirconia supported platinum catalysts for CO2/CH4 reforming (1997)
Bitter, J.H., Seshan, K., Lercher, J.A.
In Pt/ZrO2catalysts used for CO2/CH4reforming to syngas, not all accessible Pt contributes equally to the activity of the catalyst. The catalytic activity is determined by the accessibilityof Pt on...
Dehydrogenation of light alkanes over zeolites (1997)
Narbeshuber, T., Brait, A., Seshan, K., Lercher, J.A.
The conversion of light paraffins to olefins and the secondary reactions of the unsaturated compounds were investigated on H-ZSM5 and H-Y zeolites between 733 and 823 K. Steady state- and transient...
Liquid phase hydrogenation of crotonaldehyde over Pt/SiO2 catalysts (1997)
Englisch, M., Ranade, V., Lercher, J.A.
The dependence of the catalytic properties of Pt/SiO2 catalysts for the hydrogenation of crotonaldehyde on the hydrogen pressure, the reaction temperature, the nature of the solvent and the presence...
Picosecond infrared activation of methanol in acid zeolites (1997)
Bonn, M., Santen Van, R.A., Lercher, J.A., Kleyn, A.W., Bakker, H.J.
Highly porous, crystalline zeolite catalysts are used industrially to catalyze the conversion of methanol to gasoline. We have performed a picosecond spectroscopic study providing insights into both...
Bitter, J.H., Hally, W., Seshan, K., Ommen, J.G. Van, Lercher, J.A.
Pt supported on y-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 / y-Al2O3 < Pt / TiO2 < Pt /...
Design of stable catalysts for methane-carbon dioxide reforming (1996)
Lercher, J.A., Bitter, J.H., Hally, W., Niessen, W., Seshan, K.
The activity and stability of catalysts for methane-carbon dioxide reforming depend subtly upon the support and the active metal. Methane decomposes to carbon and hydrogen, forming carbon on the...
Catalytic hydrolysis of s-triazine compounds over Al2O3 (1996)
Zhan, Z., Mullner, M., Lercher, J.A.
Hydrolysis of cyanuric acid, melamine, melem, atrazine and melamine-formaldehyde resin was found to be catalyzed by an A12O3 catatyst. The reactions occur irreversibly with cleavage of the s-triazine...
Cejka, J., Zilkova, N., Wichterlova, B., Mirth, G.C., Lercher, J.A.
Toluene alkylation with methanol and ethylene over HZSM-5 zeolites has been investigated in order to understand the effects of deposited ¿coke¿ and postsynthesis surface silylation on the toluene...
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....
Hydrogen/Deuterium Exchange duringn-Butane Conversion on H-ZSM-5 (1996)
Narbeshuber, T., Stockenhuber, M., Brait, A., Seshan, K., Lercher, J.A.
Steady-state isotope tracer studies and isotope transient response experiments ofn-butane conversion on H-ZSM-5 (Si/Al = 35) were carried out between 673 and 823 K. Among the three main reactions,...
Oxidative dehydrogenation of propane over niobia supported vanadium oxide catalysts (1996)
Watling, T.C., Deo, G., Seshan, K., Wachs, I.E., Lercher, J.A.
Oxidative dehydrogenation (ODH) of propane is examined over a series of catalysts, which include Nb2O5 supported monolayer V2O5 catalysts, bulk vanadia-niobia with different vanadium oxide loadings...
Lercher, J.A., Grundling, C., Mirth, G.C.
The use of infrared spectroscopy to probe the surface acidity of oxides and molecular sieves is reviewed. The experimental requirements and the type and nature of probe molecules available are also...
Synthesis and characterization of mesoporic materials containing highly dispersed cobalt (1996)
Jentys, A., Pham, M.H., Vinek, H., Englisch, M., Lercher, J.A.
Highly dispersed Co particles in MCM-41 were prepared by direct addition of CoCl2 to the synthesis gel. The small clusters of Co did not sinter during reduction and sulfidation. Incorporation of Co...
Grundling, C., Mirth, G.C., Lercher, J.A.
Methylamine synthesis from methanol and ammonia over parent and modified Brønsted acidic mordenites is studied byin situinfrared spectroscopy and kinetic analysis to elucidate the role of elementary...
The influence of extraframework aluminum on H-FAU catalyzed cracking of light alkanes (1996)
Narbeshuber, T., Brait, A., Seshan, K., Lercher, J.A.
The conversion of light linear and branched alkanes on two faujasite samples containing different concentrations of free Brønsted acid sites and extraframework alumina (EFAL) was studied between 733...
Characterization and removal of extra lattice species in faujasites (1995)
Stockenhuber, M., Lercher, J.A.
The acidic properties of dealuminated Y-type zeolites were characterized by infrared (IR) spectroscopy, microcalorimetry, 29Si magic-angle spinning nuclear magnetic resonance (MAS NMR) spectroscopy...
n-Butane isomerization over acidic mordenite (1995)
Asuquo, Raymond A., Eder-Mirth, Gabriele, Lercher, J.A.
Conversion of n-butane was studied between 523 K and 623 K over acidic mordenites with SiO2/Al2O3 ratios between 10 and 20. The main products were iso-butane, propane, and pentane. The selectivity to...
Monomolecular conversion of light alkanes over H-ZSM-5 (1995)
Narbeshuber, T., Vinek, H., Lercher, J.A.
The monomolecular conversion of light n-alkanes (propane to n-hexane) over H-ZSM-5 was investigated between 723 and 823 K. The rates and energies of activation of the individual reactions were...
Problem of coke formation on Ni/ZrO2 catalysts during the carbon dioxide reforming of methane (1994)
Hally, W., Bitter, J.H., Seshan, K., Lercher, J.A., Ross, J.R.H.
The suitability of zirconia-based nickel catalysts for the CO2 reforming reaction has been investigated with emphasis on the stability of the cattalysts under conditions favourable towards carbon...