Applications of light olefin oligomerization to the production of fuels and chemicals
- Christopher P. Nicholas
- Chemistry
- 5 August 2017
Insights into the deactivation mechanism of supported tungsten hydride on alumina (W-H/Al2O3) catalyst for the direct conversion of ethylene to propylene
- E. Mazoyer, K. Szeto, M. Taoufik
- Chemistry
- 1 April 2014
Benzene selectivity in competitive arene hydrogenation: effects of single-site catalyst···acidic oxide surface binding geometry.
- Weixing Gu, M. Stalzer, T. Marks
- ChemistryJournal of the American Chemical Society
- 30 April 2015
The combined XAS, solid state NMR, and DFT data argue that the bulky catalyst benzyl groups expand the "cationic" metal center-anionic sulfated oxide surface distances, and this separation/weakened ion-pairing enables the activation/insertion of more sterically encumbered arenes and influences hydrogenation rates and selectivity patterns.
The shape of water in zeolites and its impact on epoxidation catalysis
- D. Bregante, M. Chan, D. Flaherty
- ChemistryNature Catalysis
- 26 November 2020
Solvent structures that surround active sites reorganize during catalysis and influence the stability of surface intermediates. Within zeolite pores, H2O molecules form hydrogen-bonded structures…
Synthesis, spectroscopy, and catalytic properties of cationic organozirconium adsorbates on "super acidic" sulfated alumina. "Single-site" heterogeneous catalysts with virtually 100 active sites.
- Christopher P. Nicholas, Hongsang Ahn, T. Marks
- ChemistryJournal of the American Chemical Society
- 15 March 2003
Two complementary active site kinetic assays for benzene hydrogenation show that, unlike typical heterogeneous and supported organometallic catalysts, 97 +/- 2% of all Cp'ZrMe(3) (3)/AlS sites are catalytically significant, demonstrating that the species identified by (13)C CPMAS NMR is indeed the active species.
Atomic Layer Deposition Overcoating Improves Catalyst Selectivity and Longevity in Propane Dehydrogenation
- Zheng Lu, Ryon W. Tracy, C. Marshall
- Chemistry
- 16 November 2020
Propylene, a precursor for commodity chemicals and plastics, is produced by propane dehydrogenation (PDH). An increase in PDH yield via added catalyst activity, lifetime, or selectivity represents ...
Formation pathway for LTA zeolite crystals synthesized via a charge density mismatch approach.
- M. Park, Yoorim Lee, S. Hong
- ChemistryJournal of the American Chemical Society
- 13 February 2013
The overall characterization results of this work demonstrate that sod-cages are first built around the preorganized lta-cage and that d4r-c cages are in turn constructed by the progressive addition of low-molecular-weight (alumino)silicate species, which promotes the formation and growth of embryonic LTA zeolite crystals.
Study of ethylene/2-butene cross-metathesis over W-H/Al2O3 for propylene production: Effect of the temperature and reactant ratios on the productivity and deactivation
- E. Mazoyer, K. Szeto, Christopher P. Nicholas
- Chemistry
- 1 May 2013
Single-Face/All-cis Arene Hydrogenation by a Supported Single-Site d(0) Organozirconium Catalyst.
- M. Stalzer, Christopher P. Nicholas, A. Bhattacharyya, A. Motta, M. Delferro, T. Marks
- ChemistryAngewandte Chemie
- 18 April 2016
Kinetic/mechanistic and DFT analysis argue that stereoselection involves rapid, sequential H2 delivery to a single catalyst-bound arene face, versus any competing intramolecular arene π-face interchange.
Development of the first well-defined tungsten oxo alkyl derivatives supported on silica by SOMC: towards a model of WO3/SiO2 olefin metathesis catalyst.
- E. Mazoyer, N. Merle, M. Taoufik
- ChemistryChemical Communications
- 23 November 2010
A well-defined, silica-supported tungsten oxo alkyl species prepared by the surface organometallic chemistry approach displays high and sustained activity in propene metathesis. Remarkably, its…
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