scholarly journals A high-pressure x-ray photoelectron spectroscopy instrument for studies of industrially relevant catalytic reactions at pressures of several bars

2019 ◽  
Vol 90 (10) ◽  
pp. 103102 ◽  
Author(s):  
Peter Amann ◽  
David Degerman ◽  
Ming-Tao Lee ◽  
John D. Alexander ◽  
Mikhail Shipilin ◽  
...  
Keyword(s):  
High Pressure ◽  
Photoelectron Spectroscopy ◽  
Catalytic Reactions ◽  
X Ray

The Sodium Loss and Transport through the Walls of the Ceramic Discharge Tube of High Pressure Sodium Lamps

2006 ◽  
Vol 514-516 ◽  
pp. 1363-1368 ◽  
Author(s):  
Henriett Lovas ◽  
Vargane Katalin Josépovits ◽  
Zoltán Tóth ◽  
János Madarász
Keyword(s):  
High Pressure ◽  
Mass Spectroscopy ◽  
Photoelectron Spectroscopy ◽  
Glass Surface ◽  
Oxide Ceramic ◽  
Internal Wall ◽  
Dissociative Mechanism ◽  
X Ray ◽  
Sodium Loss ◽  
Secondary Ion

In this work we present the investigations on the blackening of the outer jacket of the High Pressure Sodium (HPS) lamps. For this purpose ceramic arc tubes and their glass outer jackets taken from lamps burned for different times (0h-10000h) were examined by X-ray Photoelectron Spectroscopy (XPS) and Secondary Ion Mass Spectroscopy (SIMS) in order to determine the composition of the deposit on the internal wall of glass outer jacket. In the case of the several thousand hours burned lamps the outer bulb was found to be covered by aluminium, which comes to a black deposit on the glass surface. XPS identified Al on the glass surface can be found in two different chemical state (elemental Al, Al2O3). The assumed evaporation of aluminium-oxide ceramic tube might be described by a dissociative mechanism of the alumina evaporation. This papers described the possible mechanism of the alumina evaporation. Na was also found in the black deposit, whose cause of this in the case of the several thousand hours burned lamps is probably related to the sodium transport through the walls of the arc tube

Synthesis, characterization and reactivity of trans-dihydroxy platinum(IV) porphyrins

2016 ◽  
Vol 20 (07) ◽  
pp. 785-792 ◽  
Author(s):  
Yingying Ning ◽  
Yi Yu ◽  
Yi-Wei Liu ◽  
Jing Zhang ◽  
Hao-Ling Sun ◽  
...  
Keyword(s):  
Oxygen Atom ◽  
Single Crystal ◽  
Crystal Structures ◽  
Oxidation State ◽  
Photoelectron Spectroscopy ◽  
Catalytic Reactions ◽  
X Ray ◽  
Single Crystal Structures

Synthesis of two trans-dihydroxy platinum(IV) porphyrins (TPP, tetraphenylporphyrin and F[Formula: see text]TPP, tetrakispentafluorophenylporphyrin) by dimethyl dioxirane (DMD) oxidation of their Pt[Formula: see text] porphyrin precursors have been described. The oxidation state of Pt cation in such complexes was assessed by X-ray photoelectron spectroscopy and shown to be [Formula: see text]4. More importantly, proton was found to promote the formation and stabilization of the trans-dihydroxy platinum(IV) porphyrins, as revealed by UV-vis spectroscopic results and single crystal structures. In addition, these trans-dihydroxy Pt[Formula: see text] porphyrins were much easier to be reduced than their Pt(II) counterparts and capable to transfer oxygen atom to triphenylphosphine and thioanisol, which is important for further application of Pt(IV) complexes in catalytic reactions.

A high pressure x-ray photoelectron spectroscopy study of CO oxidation over Rh(100)

2013 ◽  
Vol 26 (5) ◽  
pp. 055003 ◽  
Author(s):  
J Gustafson ◽  
S Blomberg ◽  
N M Martin ◽  
V Fernandes ◽  
A Borg ◽  
...  
Keyword(s):  
High Pressure ◽  
Co Oxidation ◽  
Photoelectron Spectroscopy ◽  
Spectroscopy Study ◽  
X Ray

scholarly journals High-pressure X-ray photoelectron spectroscopy of palladium model hydrogenation catalysts.Part 1: Effect of gas ambient and temperature

2005 ◽  
Vol 230 (1) ◽  
pp. 186-194 ◽  
Author(s):  
D TESCHNER ◽  
A PESTRYAKOV ◽  
E KLEIMENOV ◽  
M HAVECKER ◽  
H BLUHM ◽  
...  
Keyword(s):  
High Pressure ◽  
Photoelectron Spectroscopy ◽  
X Ray

A high pressure X-ray photoelectron spectroscopy study of oxidation and reduction of Rh(100) and Rh nanoparticles

2014 ◽  
Vol 628 ◽  
pp. 153-158 ◽  
Author(s):  
S. Blomberg ◽  
R. Westerström ◽  
N.M. Martin ◽  
E. Lundgren ◽  
J.N. Andersen ◽  
...  
Keyword(s):  
High Pressure ◽  
Photoelectron Spectroscopy ◽  
Spectroscopy Study ◽  
X Ray

scholarly journals Operando high-pressure investigation of size-controlled CuZn catalysts for the methanol synthesis reaction

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Núria J. Divins ◽  
David Kordus ◽  
Janis Timoshenko ◽  
Ilya Sinev ◽  
Ioannis Zegkinoglou ◽  
...  
Keyword(s):  
High Pressure ◽  
Photoelectron Spectroscopy ◽  
Active Sites ◽  
Surface Segregation ◽  
Ambient Pressure ◽  
Catalytic Performance ◽  
Oxide Interface ◽  
X Ray ◽  
Oxide Support ◽  
Open Questions

AbstractAlthough Cu/ZnO-based catalysts have been long used for the hydrogenation of CO2 to methanol, open questions still remain regarding the role and the dynamic nature of the active sites formed at the metal-oxide interface. Here, we apply high-pressure operando spectroscopy methods to well-defined Cu and Cu0.7Zn0.3 nanoparticles supported on ZnO/Al2O3, γ-Al2O3 and SiO2 to correlate their structure, composition and catalytic performance. We obtain similar activity and methanol selectivity for Cu/ZnO/Al2O3 and CuZn/SiO2, but the methanol yield decreases with time on stream for the latter sample. Operando X-ray absorption spectroscopy data reveal the formation of reduced Zn species coexisting with ZnO on CuZn/SiO2. Near-ambient pressure X-ray photoelectron spectroscopy shows Zn surface segregation and the formation of a ZnO-rich shell on CuZn/SiO2. In this work we demonstrate the beneficial effect of Zn, even in diluted form, and highlight the influence of the oxide support and the Cu-Zn interface in the reactivity.

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