CO-FTIR CHARACTERIZATION OF PVP-PROTECTED Pt NANOCLUSTERS ON ZEOLITE BETA

2004 ◽  
Vol 03 (03) ◽  
pp. 247-254 ◽  
Author(s):  
JINGHONG MA ◽  
SHUHUA REN ◽  
RUIFENG LI ◽  
WEICHENG WU ◽  
CAN LI ◽  
...  
Keyword(s):  
Co Adsorption ◽  
Zeolite Beta ◽  
Beta Zeolite ◽  
High Dispersion ◽  
Pt Nanoclusters ◽  
In Situ Ftir Spectroscopy ◽  
Ftir Characterization ◽  
High Silica

CO chemisorption on PVP-protected Pt clusters supported on fine high silica zeolite Beta has been studied by in situ FTIR spectroscopy. Two special CO adsorption bands are observed at 2050 cm-1 and 1860 cm-1, respectively, on the surface of catalysts. The frequency shifts and CO band intensity vary with the changing of catalyst preparation parameters, such as polymer amount, Pt loading and pretreatment processing. The results show that PVP-protected Pt clusters have high dispersion on Beta zeolite surface and strong chemical adsorption to CO.

scholarly journals Determining the Location of Co2+ in Zeolites by UV-Vis Diffuse Reflection Spectroscopy: A Critical View

Catalysts ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 123 ◽  
Author(s):  
Andrea Bellmann ◽  
Christine Rautenberg ◽  
Ursula Bentrup ◽  
Angelika Brückner
Keyword(s):  
Diffuse Reflection ◽  
Co Adsorption ◽  
In Situ Ftir ◽  
Diffuse Reflection Spectroscopy ◽  
Reflection Spectroscopy ◽  
Oxide Supports ◽  
In Situ Ftir Spectroscopy ◽  
Vis Spectroscopy

UV–Vis spectroscopy as well as in situ FTIR spectroscopy of pyridine and CO adsorption were applied to determine the nature of Co species in microporous, mesoporous, and mixed oxide materials like Co–ZSM-5, Co/Na–ZSM-5, Co/Al–SBA-15, and Co/Al2O3–SiO2. Because all sample types show comparable UV–Vis spectra with a characteristic band triplet, the former described UV–Vis band deconvolution method for determination and quantification of individual cationic sites in the zeolite appears doubtful. This is also confirmed by results of pyridine and CO adsorption revealing that all Co–zeolite samples contain two types of Co2+ species located at exchange positions as well as in oxide-like clusters independent of the Co content, while in Co/Al–SBA-15 and Co/Al2O3–SiO2 only Co2+ species in oxide-like clusters occur. Consequently, the measured UV–Vis spectra represent not exclusively isolated Co2+ species, and the characteristic triplet band is not only related to γ-, β-, and α-type Co2+ sites in the zeolite but also to those dispersed on the surface of different oxide supports. The study demonstrates that for proper characterization of the formed Co species, the use of complementary methods is required.

Versatile thin layer spectroelectrochemical cell employing specular reflectance

1987 ◽  
Vol 65 (5) ◽  
pp. 919-923 ◽  
Author(s):  
A. Scott Hinman ◽  
Brad J. Pavelich
Keyword(s):  
Thin Layer ◽  
Specular Reflection ◽  
Incident Light ◽  
Tetrabutylammonium Perchlorate ◽  
Specular Reflectance ◽  
Advantages And Disadvantages ◽  
Ftir Characterization ◽  
Sandwich Type

A versatile thin layer spectroelectrochemical cell employing specular reflection of the incident light beam from the electrode surface is described. Its application to in-situ uv–vis and FTIR characterization of the products of electrochemical reactions and to thin layer voltammetry and coulometry as well as conventional cyclic voltammetry is demonstrated for the oxidation of tetraphenylporphinatozinc in dichloroethane/tetrabutylammonium perchlorate solution. The advantages and disadvantages of this type of cell as compared to more conventional sandwich type optically transparent thin layer electrodes are discussed.

In situ FTIR characterization of the adsorption of CO and its reaction with NO on Pd-based FCC low NOx combustion promoters

2007 ◽  
Vol 127 (1-4) ◽  
pp. 189-198 ◽  
Author(s):  
Oleg S. Alexeev ◽  
Sundaram Krishnamoorthy ◽  
Cody Jensen ◽  
Michael S. Ziebarth ◽  
George Yaluris ◽  
...  
Keyword(s):  
In Situ Ftir ◽  
Ftir Characterization ◽  
Low Nox Combustion ◽  
Adsorption Of Co ◽  
Combustion Promoters

In situ and ex situ FTIR characterization of a cyanate adlayer on Cu(111)

2004 ◽  
Vol 570 (1) ◽  
pp. 47-53 ◽  
Author(s):  
K Brandt ◽  
E Vogler ◽  
M Parthenopoulos ◽  
K Wandelt
Keyword(s):  
Ex Situ ◽  
Ftir Characterization

Silica-Supported Au and Pt Nanoparticles and CO Adsorption

2005 ◽  
Vol 900 ◽  
Author(s):  
Derrick Mott ◽  
Jin Luo ◽  
Andrew Smith ◽  
Wai-Pan Chan ◽  
William Bozza ◽  
...  
Keyword(s):  
Co Adsorption ◽  
Synthesis Method ◽  
Pt Nanoparticles ◽  
Impregnation Method ◽  
Surface Binding ◽  
Nanoparticle Catalysts ◽  
Supported Nanoparticles ◽  
Ftir Characterization ◽  
Spectroscopic Characteristics

ABSTRACTThe understanding of the surface properties of metal nanoparticles is essential for exploiting their unique catalytic properties. This paper reports findings of the preparation of silica-supported Pt and Au nanoparticles and the FTIR characterization of CO adsorption on the supported nanoparticles. The nanoparticles were prepared by both a traditional impregnation method and molecular-capping based synthesis method. By comparing the spectroscopic characteristics of CO adsorption on these catalysts, similarities and differences in CO stretching bands have been identified. The findings are significant because important insights have been gained into the surface binding properties of Au and Pt nanoparticle catalysts.

In situ CIR-FTIR characterization of salicylate complexes at the goethite/aqueous solution interface

1990 ◽  
Vol 24 (6) ◽  
pp. 822-828 ◽  
Author(s):  
Eric C. Yost ◽  
M. Isabel Tejedor-Tejedor ◽  
Marc A. Anderson
Keyword(s):  
Aqueous Solution ◽  
Solution Interface ◽  
Ftir Characterization
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