Journal ArticleDOI
XPS and TPR examinations of γ-alumina-supported Pd-Cu catalysts
TLDR
In this article, an alumina-supported palladium-copper catalysts, which promote liquid-phase nitrate reduction, have been prepared according to different impregnation sequences of γ-Al 2 O 3 support and characterized by X-ray photoelectron spectroscopy (XPS), Xray induced Auger electron spectroscopic (XAES), and temperature-programmed reduction (TPR).Abstract:
Alumina-supported palladium-copper catalysts, which promote liquid-phase nitrate reduction, have been prepared according to different impregnation sequences of γ-Al 2 O 3 support and characterized by X-ray photoelectron spectroscopy (XPS), X-ray induced Auger electron spectroscopy (XAES) and temperature-programmed reduction (TPR). Analysis of Pd XPS/XAES spectra reveals that palladium is present on the γ-alumina support in the metallic form. Copper is reduced at lower temperatures in the presence of palladium particles compared to the CuO/γ-Al 2 O 3 sample. Due to the low copper content in catalysts ( σ Cu ≈10 14 atoms cm −2 ), the XPS/XEAS spectral features of reduced copper species are quite different from those of bulk copper. As shown by TPR and XPS/XAES data, formation of highly dispersed Pd-Cu bimetallic clusters is suggested. It was discovered by means of TPR analysis that the catalyst preparation in which the γ-alumina support is impregnated first by copper salt, results in higher formation of the Pd-Cu alloy.read more
Citations
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Ni-based sol–gel catalysts as promising systems for crude bio-oil upgrading: Guaiacol hydrodeoxygenation study
M. V. Bykova,D. Yu. Ermakov,Vasily V. Kaichev,Olga A. Bulavchenko,Andrey A. Saraev,M. Yu. Lebedev,V.А. Yakovlev +6 more
TL;DR: In this article, a series of Ni-based catalysts with different stabilizing components has been tested in the hydrodeoxygenation (HDO) of guaiacol (2-methoxyphenol), bio-oil model compound.
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Conversion of furfural and 2-methylpentanal on Pd/SiO2 and Pd–Cu/SiO2 catalysts
Surapas Sitthisa,Trung Pham,Teerawit Prasomsri,Tawan Sooknoi,Richard G. Mallinson,Daniel E. Resasco +5 more
TL;DR: In this article, the conversion of furfural (FAL) and 2-methyl pentanal (MPAL) under hydrogen has been studied over silica-supported monometallic Pd and bimetallic pd-Cu catalysts.
Journal ArticleDOI
Bimetallic Pd–Cu catalysts for selective CO2 hydrogenation to methanol
TL;DR: In this paper, the Pd-Cu bimetallic catalysts for selective CO2 hydrogenation to methanol were characterized by using X-ray diffraction, transmission electron microscopy, scanning transmission electron microscope coupled with energy dispersive Xray spectroscopy, Xray photoelectron spectrograph, and hydrogen temperature-programmed desorption.
Journal ArticleDOI
Single atom alloy surface analogs in Pd0.18Cu15 nanoparticles for selective hydrogenation reactions
Matthew B. Boucher,Branko Zugic,George Cladaras,James Kammert,Matthew D. Marcinkowski,Timothy J. Lawton,E. Charles H. Sykes,Maria Flytzani-Stephanopoulos +7 more
TL;DR: The bimetallic Pd-Cu nanoparticles have over an order of magnitude higher activity for phenylacetylene hydrogenation when compared to their monometallic Cu counterpart, while maintaining a high selectivity to styrene over many hours at high conversion.
Journal ArticleDOI
Catalytic nitrate removal from water, past, present and future perspectives
Noelia Barrabés,Jacinto Sá +1 more
TL;DR: An overview of past and present research in the field and some key areas, which should be addressed to improve current and newly developed systems are presented in this article, where the problematic of ammonium byproduct formation is yet to be solved.
References
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Journal ArticleDOI
X-ray photoelectron spectroscopic studies of palladium oxides and the palladium-oxygen electrode
Journal ArticleDOI
Surface spectroscopic characterization of Cu/Al2O3 catalysts
Brian R. Strohmeier,Brian R. Strohmeier,Donald E. Levden,Donald E. Levden,R.Scott Field,R.Scott Field,David M. Hercules,David M. Hercules +7 more
TL;DR: In this article, the surface properties of impregnated CuAl2O3 catalysts were investigated by a variety of spectroscopic techniques: X-ray photoelectron spectroscopy (ESCA or XPS), low-energy ion scattering spectro-graphs (ISS), photoacoustic spectroscope (PAS), and Xray diffraction.
Journal ArticleDOI
Development of catalysts for a selective nitrate and nitrite removal from drinking water
TL;DR: In this paper, a supported palladium catalyst was proposed to reduce nitrate and nitrite to nitrogen with a selectivity of 99.9% using hydrogen on noble metal catalysts.
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