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Title: A comparison of hierarchical Pt@CeO 2 /Si–Al 2 O 3 and Pd@CeO 2 /Si–Al 2 O 3

Authors:
ORCiD logo; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1251798
Grant/Contract Number:
FG02-13ER16380
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Catalysis Today
Additional Journal Information:
Journal Volume: 253; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-10-05 09:12:24; Journal ID: ISSN 0920-5861
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English

Citation Formats

Arroyo-Ramírez, Lisandra, Chen, Chen, Cargnello, Matteo, Murray, Christopher B., and Gorte, Raymond J. A comparison of hierarchical Pt@CeO 2 /Si–Al 2 O 3 and Pd@CeO 2 /Si–Al 2 O 3. Netherlands: N. p., 2015. Web. doi:10.1016/j.cattod.2015.01.036.
Arroyo-Ramírez, Lisandra, Chen, Chen, Cargnello, Matteo, Murray, Christopher B., & Gorte, Raymond J. A comparison of hierarchical Pt@CeO 2 /Si–Al 2 O 3 and Pd@CeO 2 /Si–Al 2 O 3. Netherlands. doi:10.1016/j.cattod.2015.01.036.
Arroyo-Ramírez, Lisandra, Chen, Chen, Cargnello, Matteo, Murray, Christopher B., and Gorte, Raymond J. Tue . "A comparison of hierarchical Pt@CeO 2 /Si–Al 2 O 3 and Pd@CeO 2 /Si–Al 2 O 3". Netherlands. doi:10.1016/j.cattod.2015.01.036.
@article{osti_1251798,
title = {A comparison of hierarchical Pt@CeO 2 /Si–Al 2 O 3 and Pd@CeO 2 /Si–Al 2 O 3},
author = {Arroyo-Ramírez, Lisandra and Chen, Chen and Cargnello, Matteo and Murray, Christopher B. and Gorte, Raymond J.},
abstractNote = {},
doi = {10.1016/j.cattod.2015.01.036},
journal = {Catalysis Today},
number = C,
volume = 253,
place = {Netherlands},
year = {Tue Sep 01 00:00:00 EDT 2015},
month = {Tue Sep 01 00:00:00 EDT 2015}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.cattod.2015.01.036

Citation Metrics:
Cited by: 4works
Citation information provided by
Web of Science

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  • Cited by 23
  • Ceria, platinum, and platinum-ceria catalysts supported on [gamma]-alumina have been characterized by temperature-programmed reduction (TPR) using CO as reducing agent. In all cases, CO disproportionation was found to be negligible. Nevertheless, a small CO[sub 2] TPR signal was detected on the [gamma]-alumina support at temperatures higher than 673 K, and has been attributed to the water-gas shift reaction between gaseous CO and the hydroxyl groups of the alumina surface. The comparison between the CO-TPR spectra of CeO[sub 2]/Al[sub 2]O[sub 3] and Pt-CeO[sub 2]/Al[sub 2]O[sub 3] has revealed that platinum induces a downscale shift on the temperature of the ceria reductionmore » peak. Two possible interpretations of this platinum-ceria interaction are proposed: (i) a C-O bond weakening when CO is absorbed on platinum particles and (ii) a decrease of the Ce-O bond strength for ceria localized near platinum. 18 refs., 6 figs., 1 tab.« less
  • The crystal structure of partially Pd{sup 2+}-exchanged zeolite X, dehydrated at 400 C in a flowing O{sub 2} stream (a = 24.982(4){angstrom}), has been determined by single-crystal X-ray diffraction techniques in the cubic space group Fd{bar 3} at 21(1) C. The crystal was first Pd{sup 2+}-exchanged in a flowing stream of 0.05 M aqueous Pd(NH{sub 3}){sub 4}Cl{sub 2} for 3 days. After dehydration at 400 C in flowing oxygen, the crystal was evacuated at 21(1) C and 2 x 10{sup {minus}6} Torr for 2 h. The structure was refined to the final error indices R{sub 1} = 0.070 and R{submore » 2} = 0.051 for the 196 reflections for which I > 2{sigma}(I). In this structure, Pd{sup 2+} ions are found at four crystallographic sites: Na{sup +} ions fill just one, and nonframework oxygens are found at two. Eight Pd{sup 2+} ions and eight O{sup 2{minus}} ions fill the 16 double six-oxygen ring (D6R) centers (site I) per unit cell; this interpretation of the electron density at site I behaves well in least-squares refinement. Each of these Pd{sup 2+} ions is octahedrally coordinated by framework oxygens. Sixteen Pd{sup 4+} ions at site I{prime} (Pd-O = 2.103(13){angstrom}) lie in six-ring planes. With the eight oxide ions at site I at central positions and 16 more terminal, they form eight linear O-Pd-O-Pd-O clusters along 3-fold axes per unit cell. Each passes through the center of a D6R and extends into its two adjacent sodalite cavities. Considering bond lengths and charge balance, it is proposed that they are [HO-Pd{sup IV}-O-Pd{sup IV}-OH]{sup 4+} clusters with O-Pd-O-Pd-O linear. Thirty-two Na{sup +} ions fill site II and are recessed 1.03(1){angstrom} into the supercage from the single six-ring plane (Na-O = 2.258(11){angstrom}). About two Pd{sup 2+} ions at another site I{prime} (Pd-O = 2.371(11){angstrom}) are displaced 1.11 {angstrom} from six-ring plane into sodalite cages. About four Pd{sup 2+} ions lie at site III{prime} in the supercage (Pd-O = 2.16(5){angstrom}).« less
  • CO/NO reactions have been studied over two catalysts, Pt/CeO{sub x}/Al{sub 2}O{sub 3} and Pt/Al{sub 2}O{sub 3}, under net reducing conditions. The Pt/Al{sub 2}O{sub 3} catalyst deactivated with time at 400{degrees}C whereas the Pt/CeO{sub x}/Al{sub 2}O{sub 3} catalyst showed oscillations in the reaction rate at this temperature. The oscillations had periods of 18 min. By using Fourier transform infrared spectroscopy, an attempt was made to reveal the species that inhibits the reaction over Pt. It is suggested that Ce{sub x} provides dissociation centers for NO under conditions where NO dissociation is hindered by the inhibiting species on the Pt sites. 47more » refs., 9 figs., 1 tab.« less
  • ZrO 2-Al 2O 3 and CeO 2-Al 2O 3 were prepared by a co-precipitation method and selected as supports for Pt catalysts. The effects of CeO 2 and ZrO 2 on the surface area and Brønsted acidity of Pt/Al 2O 3 were studied. In the hydrodeoxygenation (HDO) of p-cresol, the addition of ZrO 2 promoted the direct deoxygenation activity on Pt/ZrOO 2-Al 2O 3 via Caromatic-O bond scission without benzene ring saturation. Pt/CeOO 2-Al 2O 3 exhibited higher deoxygenation extent than Pt/Al 2O 3 due to the fact that Brønsted acid sites on the catalyst surface favored the adsorption ofmore » p-cresol. With the advantages of CeO 2 and ZrO 2 taken into consideration, CeO 2-ZrOO 2-Al 2O 3 was prepared, leading to the highest HDO activity of Pt/CeO 2-ZrOO 2-Al 2O 3. The deoxygenation extent for Pt/CeO 2-ZrOO 2-Al 2O 3 was 48.4% and 14.5% higher than that for Pt/ZrO2O 2-Al 2O 3 and Pt/CeOO 2-Al 2O 3, respectively.« less