Selective Hydrogenation of Phenol Catalyzed by Palladium on High- Surface-Area Ceria at Room Temperature and Ambient Pressure Slowing, Igor Manzano, Juan Sadow, Aaron Overbury, Steven Slowing, Igor
dc.contributor.department Ames Laboratory
dc.contributor.department Chemistry 2018-02-17T06:40:50.000 2020-06-29T23:26:36Z 2020-06-29T23:26:36Z Thu Jan 01 00:00:00 UTC 2015 2015-02-01
dc.description.abstract <p>Palladium supported on high-surface-area ceria effectively catalyzes the hydrogenation of phenol to cyclohexanone at atmospheric pressure and room temperature. Activation of H2 at Pd sites and phenol at surface ceria sites was investigated by probing the redox properties of the catalyst and studying the mechanism of phenol adsorption. Temperature-programmed reduction and pulsed chemisorption were used to examine the effects of prereduction temperature on catalyst dispersion and reducibility. A sharp effect of prereduction temperature on catalytic activity was observed. This dependence is rationalized as a result of interactions between palladium and ceria, which under reducing conditions enhance palladium dispersion and create different types of environments around the Pd active sites and of encapsulation of the catalyst caused by support sintering at high temperatures. Temperature-programmed diffuse reflectance infrared Fourier transform spectroscopy revealed that phenol undergoes dissociative adsorption on ceria to yield cerium-bound phenoxy and water. Reduction of the chemisorbed phenoxy species decreases the number of proton-accepting sites on the surface of ceria and prevents further dissociative adsorption. Subsequent phenol binding proceeds through physisorption, which is a less active binding mode for reduction by hydrogen. High activity can be restored upon regeneration of proton acceptor sites via reoxidation/reduction of the catalyst.</p>
dc.description.comments <p>Reprinted (adapted) with permission from <em>ACS Catalysis</em> 5 (2015): 2051, doi:<a href="" target="_blank">10.1021/cs502000j</a>. Copyright 2015 American Chemical Society.</p>
dc.format.mimetype application/pdf
dc.identifier archive/
dc.identifier.articleid 1300
dc.identifier.contextkey 7880735
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath ameslab_pubs/296
dc.language.iso en
dc.source.bitstream archive/|||Fri Jan 14 23:15:19 UTC 2022
dc.source.uri 10.1021/cs502000j
dc.subject.disciplines Chemistry
dc.subject.keywords mesoporous ceria
dc.subject.keywords phenol hydrogenation
dc.subject.keywords metal−support interactions
dc.subject.keywords dissociative adsorption
dc.subject.keywords redox-active support
dc.title Selective Hydrogenation of Phenol Catalyzed by Palladium on High- Surface-Area Ceria at Room Temperature and Ambient Pressure
dc.type article
dc.type.genre article
dspace.entity.type Publication
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relation.isOrgUnitOfPublication 25913818-6714-4be5-89a6-f70c8facdf7e
relation.isOrgUnitOfPublication 42864f6e-7a3d-4be3-8b5a-0ae3c3830a11
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