A5039313369- Zeolite Catalysis and Synthesis
- Catalytic Processes in Materials Science
- Mesoporous Materials and Catalysis
- Catalysis and Oxidation Reactions
- Catalysis for Biomass Conversion
- Chemical Synthesis and Characterization
- Catalysis and Hydrodesulfurization Studies
- Advanced NMR Techniques and Applications
- Crystallization and Solubility Studies
- Metal-Organic Frameworks: Synthesis and Applications
- Catalysts for Methane Reforming
- X-ray Diffraction in Crystallography
- Clay minerals and soil interactions
- Advanced Photocatalysis Techniques
- Polyoxometalates: Synthesis and Applications
- Crystal Structures and Properties
- Ammonia Synthesis and Nitrogen Reduction
- Thermochemical Biomass Conversion Processes
- Carbon Dioxide Capture Technologies
- Asymmetric Hydrogenation and Catalysis
- Solid-state spectroscopy and crystallography
- biodegradable polymer synthesis and properties
- Advanced Chemical Physics Studies
- Nanomaterials for catalytic reactions
- Synthetic Organic Chemistry Methods
University of Delaware
2016-2025
Center for Innovation
2012-2023
Newark Hospital
2014-2021
Instituto de Tecnología Química
2019
Consejo Superior de Investigaciones Científicas
2019
Universitat Politècnica de València
2019
Catalytic Materials (United States)
2012-2019
United States Department of Energy
2016-2017
University of California, Berkeley
2013
John Wiley & Sons (United States)
2011
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTZeolite and molecular sieve synthesisMark E. Davis Raul F. LoboCite this: Chem. Mater. 1992, 4, 756–768Publication Date (Print):July 1, 1992Publication History Published online1 May 2002Published inissue 1 July 1992https://pubs.acs.org/doi/10.1021/cm00022a005https://doi.org/10.1021/cm00022a005research-articleACS PublicationsRequest reuse permissionsArticle Views14479Altmetric-Citations1242LEARN ABOUT THESE METRICSArticle Views are the...
A renewable route to p-xylene from biomass-derived dimethylfuran and ethylene is investigated with zeolite catalysts. Cycloaddition of 2,5-dimethylfuran subsequent dehydration has been achieved 75% selectivity using H–Y an aliphatic solvent at 300 °C. Competitive side reactions include hydrolysis 2,5-hexanedione, alkylation p-xylene, polymerization 2,5-hexanedione. The observed reaction rates computed energy barriers are consistent a two-step that proceeds through bicyclic adduct prior...
Low-pressure adsorption of carbon dioxide and nitrogen was studied in both acidic copper-exchanged forms SSZ-13, a zeolite containing an 8-ring window. Under ideal conditions for industrial separations CO(2) from N(2), the adsorbed solution theory selectivity is >70 each compound. For low gas coverage, isosteric heat found to be 33.1 34.0 kJ/mol Cu- H-SSZ-13, respectively. From situ neutron powder diffraction measurements, we ascribe over N(2) differences binding sites two gases, where...
Experimental and technoeconomic analysis of a catalytic process for the conversion whole biomass into jet fuel.
Isomerization of sugars is used in a variety industrially relevant processes and glycolysis. Here, we show that hydrophobic zeolite beta with framework tin or titanium Lewis acid centers isomerizes sugars, e.g., glucose, via reaction pathways are analogous to those metalloenzymes. Specifically, experimental theoretical investigations reveal glucose partitions into the pyranose form, ring opens acyclic form presence center, fructose, finally closes yield furanose product. The catalysts...
Nitrogen oxides (NOx) are a major atmospheric pollutant produced through the combustion of fossil fuels in internal engines. Copper-exchanged zeolites promising as selective catalytic reduction catalysts for direct conversion NO into N2 and O2, recent reports have shown enhanced performance Cu-CHA over other zeolite frameworks decomposition exhaust gas streams. In present study, Rietveld refinement variable-temperature XRD synchrotron data obtained Cu-SSZ-13 Cu-SSZ-16 is used to investigate...
A nonenzymatic route for xylose isomerization in an aqueous medium using zeolite Sn-beta as a catalyst is demonstrated. Xylulose and lyxose are the primary secondary products. The maximum yield to xylulose 27%, with 11% at ∼60% conversion 100 °C. When combined Brønsted acid catalyst, furfural forms single pot from much lower temperatures than typically employed this reaction.
RuC ees′ transfer: Transfer hydrogenation using alcohols as hydrogen donors and supported ruthenium catalysts results in the selective conversion of hydroxymethylfurfural to dimethylfuran (>80 % yield). During transfer hydrogenation, produced from is utilized hydroxymethylfurfural. As a service our authors readers, this journal provides supporting information supplied by authors. Such materials are peer reviewed may be re-organized for online delivery, but not copy-edited or typeset....
Cu chabazite catalysts show remarkable low temperature activity in selective catalytic reduction (SCR) of NO. This high is due to the unique character zeolite framework that allows only presence one type isolated mononuclear Cu(2+) species. These species are active sites for SCR.
This communication reports the discovery of several small-pore Cu-zeolites and zeotypes that produce methanol from methane water vapor, more per copper atom than Cu-ZSM-5 Cu-mordenite. The new materials include Cu-SSZ-13, Cu-SSZ-16, Cu-SSZ-39, Cu-SAPO-34.
Cu-exchanged small-pore zeolites (CHA and AEI) form methanol from methane (>95% selectivity) using a 3-step cyclic procedure (Wulfers et al. Chem. Commun. 2015, 51, 4447−4450) with amounts higher than Cu-ZSM-5 Cu-mordenite on per gram Cu basis. Here, the CuxOy species formed Cu-SSZ-13 Cu-SSZ-39 following O2 or He activation at 450 °C are identified as trans-μ-1,2-peroxo dicopper(II) ([Cu2O2]2+) mono-(μ-oxo) ([Cu2O]2+) synchrotron X-ray diffraction, in situ UV–vis, Raman spectroscopy theory....
The potential of replacing steam cracking with ODHE using a B-CHA catalyst is first investigated through comprehensive techno-economic and life-cycle assessments.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSiO-.cntdot. .cntdot. .cntdot.HOSi Hydrogen Bonds in As-Synthesized High-Silica ZeolitesHubert Koller, Raul F. Lobo, Sandra L. Burkett, and Mark E. DavisCite this: J. Phys. Chem. 1995, 99, 33, 12588–12596Publication Date (Print):August 1, 1995Publication History Published online1 May 2002Published inissue 1 August 1995https://pubs.acs.org/doi/10.1021/j100033a036https://doi.org/10.1021/j100033a036research-articleACS PublicationsRequest reuse...
A novel scheme for using modified colloidal crystals as templates silica polymerization is reported. 3D close-packed of submicrometer latex spheres are assembled on a membrane surface by filtration. To induce polymerization, the particles adsorption surfactant hexadecyltrimethylammonium bromide. The then infused with solution, which polymerizes in cavities. In final stage, removed calcination, leaving behind porous very low density. Scanning electron microscopy images demonstrate that...
Samples of high-silica SSZ-13, ion exchanged with protons and alkali-metal cations Li(+), Na(+), K(+), were investigated using adsorption isotherms CO(2) N(2). The results show that Li-, Na-SSZ-13 have excellent capacity at ambient temperature pressure; in general, Li-SSZ-13 shows the highest for N(2), particularly low-pressure region. effect cation type Si/Al ratio (6 12) on properties was through analysis heats adsorption. separation a flue gas mixture evaluated these adsorbents pressure...
The hydrodeoxygenation (HDO) of meta-cresol, a typical phenolic compound in bio-oils, is investigated the vapor-phase on γ-Al2O3-supported Pt catalysts at near atmospheric hydrogen pressure. HDO reaction yields two major hydrocarbons: toluene and methylcyclohexane. deoxygenation meta-cresol proceeds through consecutive steps: hydrogenation aromatic ring metal followed by dehydration reactions produced alcohol intermediates alumina support. Phenolic saturation proposed to be slower than its...
Direct catalytic methanol production from methane is achieved on Cu-SSZ-13 zeolite catalysts using N2O as the oxidant. The rate (on a per gram basis) was more than twice Cu-mordenite and four times Cu-ZSM-5.
The adsorption properties of framework Sn sites in a siliceous zeolite beta were examined by comparing the acetonitrile, diethyl ether, and 2-methyl-2-propanol on Sn-Beta zeolite, purely Beta with impregnated SnO2, using temperature-programmed desorption (TPD) thermogravimetric analysis (TGA). Adsorption stoichiometries close to one molecule per site observed for each probe molecules. Although 1:1 complexes acetonitrile ether decompose reversibly upon mild heating vacuo, complex formed...