A5004140779- Zeolite Catalysis and Synthesis
- Thermochemical Biomass Conversion Processes
- Heat transfer and supercritical fluids
- Catalysis and Hydrodesulfurization Studies
- Catalytic Processes in Materials Science
- Phase Equilibria and Thermodynamics
- Metal-Organic Frameworks: Synthesis and Applications
- Catalysis and Oxidation Reactions
- Catalysis for Biomass Conversion
- Subcritical and Supercritical Water Processes
- NMR spectroscopy and applications
- Advanced Chemical Physics Studies
- Mesoporous Materials and Catalysis
- Public Procurement and Policy
- Catalysts for Methane Reforming
- Data Quality and Management
- Petroleum Processing and Analysis
- Chemical Synthesis and Characterization
- Diffusion Coefficients in Liquids
- Asymmetric Hydrogenation and Catalysis
- Advanced Battery Materials and Technologies
- Cold Atom Physics and Bose-Einstein Condensates
University of Pennsylvania
2014-2019
University at Buffalo, State University of New York
1989-1991
The catalytic properties of Pd@ZrO2 core–shell catalysts supported on Si-modified alumina were studied for application to methane oxidation and compared the analogous Pd@CeO2 catalysts. In absence water (dry conditions), both highly active showed nearly identical reaction rates thermal stabilities. However, unlike based Pd@CeO2, also very stable in presence high concentrations vapor. By means Coulometric titration pulse-reactor studies, we demonstrate that ZrO2 contact with Pd can be...
Abstract p ‐Xylene is a major commodity chemical used for the production of polyethylene terephthalate, polymer with applications in polyester fibers, films, and bottles. The Diels–Alder cycloaddition 2,5‐dimethylfuran ethylene subsequent dehydration cycloadduct intermediate an attractive reaction pathway to produce renewable ‐xylene from biomass feedstocks. However, highest yields reported previously do not exceed 75 %. We report that P‐containing zeolite Beta active, stable, selective...
CH4 adsorption was studied experimentally and theoretically on ZSM-5, MOR, ZSM-12 zeolites using calorimetric measurements at 195 K plane wave DFT calculations. Differential heats measured four different H-ZSM-5 samples were determined to be 22.5 ± 1 kJ/mol, independent of Brønsted site density or defect concentration. However, calculations performed various functionals the most stable indicated that should bind this by an additional 1–7 a discrepancy is due inability standard methods...
The adsorption of a series small alkanes was studied experimentally on H-ZSM-5 zeolites using calorimetric measurements in order to determine their interactions with the Brønsted sites. Differential heats measured four ZSM-5 samples different Si/Al2 ratio and defect concentrations were found depend strongly Brønsted-site density but not presence defects. for CH4 sites minimal effect significant (up 11 ± 2 kJ/mol extra heats) larger alkanes, such as n-C6H14. affinity increased gas-phase...
The supercritical, high-pressure reaction of n-hexane over H-ZSM-5, with and without the addition Pt Ga, has been studied for application to endothermic reforming in scramjet engines. endothermicities reactions were determined from product distributions. For unpromoted distribution indicated that endothermicity is low decreases increasing pressure. Ga H-ZSM-5 a relatively small effect on conversion but significantly increases by selectivity form aromatics. H(Ga)-ZSM-5 catalyst showed no...
A series of ZrO2-supported WOx catalysts were prepared using atomic layer deposition (ALD) with W(CO)6, and then compared to a WOx/ZrO2 catalyst via conventional impregnation. The types sites present in these samples characterized temperature-programmed desorption/thermogravimetric analysis (TPD-TGA) measurements 2-propanol 2-propanamine. Weight changes showed that the grew at rate 8.8 × 1017 W atoms/m2 per cycle. Scanning transmission electron microscopy/energy-dispersive spectroscopy...
The addition of Zn to H-ZSM-5 zeolites was studied for application endothermic reforming in hypersonic aircraft engines. Temperature-programmed-desorption (TPD)/thermogravimetric-analysis (TGA) measurements with 2-propanamine on two H(Zn)-ZSM-5 samples showed that at low ion-exchange levels, less than 0.5 Zn/Al, each cation displaces one Brønsted-acid site. Although rates n-hexane conversion 633 and 823 K a pressure 137 bar decreased the loss Brønsted sites, promotion greatly increased...
Abstract Experimental results are reported for equilibrium adsorption and diffusivities of CH 4 , C 2 H 6 CO in type A zeolite containing mixed Na K cations ranging from 0 to 100% composition, at two temperatures 1 atm. Two simple theoretical solutions given the diffusivity. One is diffusion with pore (aperture) blocking using effective medium approximation, which readily available literature on percolation theory. The other a kinetic solution derived this work cavities heterogeneous sites,...
The catalytic properties of H-[Fe]ZSM-5 and H-[B]ZSM-5 were explored after addition Zn or Ga. TPD–TGA 2-propanamine adsorbed on Zn- Ga-exchanged showed a decrease in Brønsted-acid site densities the formation new dehydrogenation sites, similar to what is observed following exchange H-[Al]ZSM-5 amorphous silica–alumina. Exchanged cations [Fe]ZSM-5 also exhibited Lewis-acid character, as demonstrated by appearance υ(CN) stretch at 2310 cm–1 upon adsorption CD3CN. By contrast, sites not capable...
The heat flows associated with conversion of n-hexane on H-ZSM-5 and H(Zn)-ZSM-5 were measured for reaction at 60 bar both 673 773 K application to endothermic reforming hypersonic flight. determined by measuring the power required maintain a constant reactor temperature upon introduction flowing n-hexane. acid-catalyzed reactions over found be only mildly (<10 kJ/mol) low conversions exothermic all above 50%. significantly more (40–50 <70%; however, also became very high conversions....
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