A5062562272- Catalytic Processes in Materials Science
- Catalysis and Oxidation Reactions
- Zeolite Catalysis and Synthesis
- Catalysts for Methane Reforming
- Radioactive element chemistry and processing
- Catalysis for Biomass Conversion
- Thermochemical Biomass Conversion Processes
- Recycling and Waste Management Techniques
- Lignin and Wood Chemistry
- Polymer crystallization and properties
- Geochemistry and Elemental Analysis
- Advanced NMR Techniques and Applications
- Advanced Data Processing Techniques
- Copper-based nanomaterials and applications
- CO2 Sequestration and Geologic Interactions
- Catalysis and Hydrodesulfurization Studies
- Metal-Organic Frameworks: Synthesis and Applications
- Microplastics and Plastic Pollution
University of Wisconsin–Madison
2020-2024
University of Puerto Rico-Mayaguez
2020
The selective hydrogenation of acetylene has been studied over AgPd and CuPd catalysts. Controlled surface reactions were used to synthesize these bimetallic nanoparticles on both TiO2 SiO2 supports. Chemisorption measurements the catalysts indicate that Pd prefers be nanoparticle with a Cu parent catalyst, while subsurface Ag catalyst. From energy-dispersive X-ray spectroscopy analysis, composition is determined more uniform support compared support. absorption results that, after...
Abstract In the past, Cu‐oxo or ‐hydroxy clusters hosted in zeolites have been suggested to enable selective conversion of methane methanol, but impact active site's stoichiometry and structure on methanol production is still poorly understood. Herein, we apply theoretical modeling conjunction with experiments study these two factors partial oxidation Cu‐exchanged zeolite SSZ‐13. Phase diagrams developed from first‐principles suggest that Cu‐hydroxy dimers are stabilized when O 2 N used...
Abstract Bulk boron materials, such as hexagonal nitride (h‐BN), are highly selective catalysts for the oxidative dehydrogenation of propane (ODHP). Previous attempts to improve productivity these systems involved immobilization on silica and resulted in less catalysts. Here, we report that acid‐treated, activated carbon‐supported prepared via incipient wetness impregnation with boric acid (B/OAC) exhibits equal propylene selectivity improved (kg kg cat −1 hr ) compared h‐BN....
We present the controlled grafting synthesis of pinacolborane on amorphous silica. 11B solid-state NMR and IR spectroscopies reveal that precursor molecule anchors monopodally to surface can form hydrogen-bonding interactions with neighboring unreacted silanol groups. The extent hydrogen bonding be by silica pretreatment dehydration temperature. Thermal treatment grafted boron materials under vacuum generates clusters oxidized/hydrolyzed regardless weight loading, illustrating is highly...
Potential active sites for the conversion of methane to methanol in Cu-exchanged SSZ-13 are identified using a combination experimentally measured UV-vis-NIR spectroscopy and theoretical modeling.
In the oxidative dehydrogenation of propane over boron nitride, propylene selectivity is lost due to unselective gas-phase chemistry.
Abstract In the past, Cu‐oxo or ‐hydroxy clusters hosted in zeolites have been suggested to enable selective conversion of methane methanol, but impact active site's stoichiometry and structure on methanol production is still poorly understood. Herein, we apply theoretical modeling conjunction with experiments study these two factors partial oxidation Cu‐exchanged zeolite SSZ‐13. Phase diagrams developed from first‐principles suggest that Cu‐hydroxy dimers are stabilized when O 2 N used...
Abstract The development of a low temperature (−160 °C) NO adsorption technique is disclosed that avoids the chemical conversion probe molecule at room temperature. observed IR peaks for Cu + (NO) 2 and 2+ species can be used to quantify amount exchanged copper in broad range samples, including wash‐coated honeycomb. Calibration curves are determined loadings up 3.99 wt% with Silica‐to‐Alumina Ratio (SAR) 16–22, quantitative agreement complementary hydrogen Temperature Programmed Reduction...
Mechanistic investigation of the catalytic conversion model compounds for plastic pyrolysis oil (1-octene, octadiene, octane, and toluene) over ZSM-5 in a fixed-bed reactor was studied. Octene breaks down into smaller olefins, which undergo further cracking, oligomerization, cyclization, hydrogen transfer to eventually produce benzene, toluene, xylene (BTX), coke, hydrogen. The effect contact time on 1-octene investigated compared with thermodynamics analyses elucidate reaction network....
We have investigated the synthesis of hexane-1,2,5,6-tetrol (hereafter "tetrol") from aqueous solutions biomass-derived levoglucosanol "Lgol") using a (10 wt %)Pt-(10 %)WOx/TiO2 catalyst in both batch and continuous flow reactors. The tetrol selectivity was over 90% with Lgol feed concentrations 10–30 %. Most stereochemistry preserved (notably 91%), threo-Lgol "t-Lgol") erythro-Lgol "e-Lgol") converting to (S,S)-tetrol (S,R)-tetrol, respectively. rate conversion found be first-order...
The Cover Feature shows “The Catalyst Store” that contains a variety of catalysts used in important chemical transformations. In the foreground is shelf housing oxidative dehydrogenation catalysts, featuring exciting new boron-based as well traditional vanadium oxide-based catalysts. Top-shelf options are highly-selective h-BN and newly described B/C – an equally selective, higher performing, less expensive ODH catalyst h-BN. their Full Paper, L. O. Mark, R. W. Dorn et al. show oxidized...