Nicholas C. Nelson
Iowa State University
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Featured researches published by Nicholas C. Nelson.
ACS Catalysis | 2015
Li Zhang; Zili Wu; Nicholas C. Nelson; Aaron D. Sadow; Igor I. Slowing; Steven H. Overbury
Catalytic performance and the nature of surface adsorbates were investigated for high-surface-area ceria during the ethylbenzene oxidative dehydrogenation (ODH) reaction using CO2 as a soft oxidant. The high surface area ceria material was synthesized using a template-assisted method. The interactions among ethylbenzene, styrene, and CO2 on the surface of ceria and the role of CO2 for the ethylbenzene ODH reaction have been investigated in detail by using activity test, in situ diffuse reflectance infrared and Raman spectroscopy. CO2 as an oxidant not only favored the higher yield of styrene but also inhibited the deposition of coke during the ethylbenzene ODH reaction. Ethylbenzene ODH reaction over ceria followed a two-step pathway: ethylbenzene is first dehydrogenated to styrene with H2 formed simultaneously, and then CO2 reacts with H2 via the reverse water gas shift. The produced styrene can easily undergo polymerization to form polystyrene, which is a key intermediate for coke formation. In the abse...
Journal of Materials Chemistry | 2017
Nicholas C. Nelson; Zhuoran Wang; Pranjali Naik; J. Sebastián Manzano; Marek Pruski; Igor I. Slowing
Deposition of trimethylphosphate onto ceria followed by thermal treatment resulted in the formation of surface phosphates with retention of the ceria fluorite structure. The structural and chemical properties of the phosphate-functionalized ceria were studied using 31P solid-state NMR, XPS, zeta titration, ammonia thermal desorption, pyridine adsorption, and model reactions. The introduction of phosphates generated Bronsted acid sites and decreased the number of Lewis acid sites on the surface. The relative amount of Lewis and Bronsted acids can be controlled by the amount of trimethylphosphate used in the synthesis. Upon deposition of Pd, the multifunctional material showed enhanced activity for the hydrogenolysis of eugenol and guaiacol compared to Pd on the unmodified ceria support. This was attributed to the cooperativity between the Lewis acid sites, which activate the substrate for dearomatization, and the redox/Bronsted acid properties, which catalyze hydrogenolysis.
Topics in Catalysis | 2014
Nicholas C. Nelson; Umesh Chaudhary; Kapil Kandel; Igor I. Slowing
A system comprising two catalysts supported on mesoporous silica nanoparticles (MSNs) was employed to perform a sequence of two reactions in a single pot. Palladium nanoparticles catalyzed the oxidation of furfuryl alcohol with molecular oxygen at atmospheric pressure. The oxidation product, furfural, was then reacted with acetone via an aldol condensation catalyzed by amines supported on MSNs. Each reaction was first tested individually to establish optimal conditions. Both catalysts were then introduced into the same reactor under the proven conditions, and the entire reaction sequence was performed giving the desired product with high selectivity. The overall yield of the reaction sequence was highly dependent on the relative concentrations of the reactants in the mixture.
Journal of Physical Chemistry Letters | 2012
T. Purnima A. Ruberu; Nicholas C. Nelson; Igor I. Slowing; Javier Vela
ACS Catalysis | 2015
Nicholas C. Nelson; Juan Sebastian Manzano; Aaron D. Sadow; Steven H. Overbury; Igor I. Slowing
ACS Catalysis | 2015
Naresh Eedugurala; Zhuoran Wang; Umesh Chaudhary; Nicholas C. Nelson; Kapil Kandel; Takeshi Kobayashi; Igor I. Slowing; Marek Pruski; Aaron D. Sadow
Journal of Physical Chemistry C | 2013
Nicholas C. Nelson; T. Purnima; A. Ruberu; Malinda D. Reichert; Javier Vela
ACS Catalysis | 2015
Kapil Kandel; Umesh Chaudhary; Nicholas C. Nelson; Igor I. Slowing
Industrial & Engineering Chemistry Research | 2014
Naftali Opembe; Curtis Guild; Cecil K. King’ondu; Nicholas C. Nelson; Igor I. Slowing; Steven L. Suib
Catalysis Letters | 2016
Taiwo O. Dairo; Nicholas C. Nelson; Igor I. Slowing; Robert J. Angelici; L. Keith Woo