Dehydration Pathway for the Dissociation of Gas-Phase Formic Acid on Pt(111) Surface Observed via Ambient-Pressure XPS

2018 ◽  
Vol 122 (4) ◽  
pp. 2064-2069 ◽  
Author(s):  
Beomgyun Jeong ◽  
Hongrae Jeon ◽  
Ryo Toyoshima ◽  
Ethan J. Crumlin ◽  
Hiroshi Kondoh ◽  
...  
Keyword(s):  
Formic Acid ◽  
Gas Phase ◽  
Ambient Pressure ◽  
Ambient Pressure Xps

scholarly journals Inelastic electron scattering by the gas phase in near ambient pressure XPS measurements

2021 ◽  
Author(s):  
Lukas Pielsticker ◽  
Rachel Nicholls ◽  
Sebastian Beeg ◽  
Caroline Hartwig ◽  
Gudrun Klihm ◽  
...  
Keyword(s):  
Gas Phase ◽  
Electron Scattering ◽  
Ambient Pressure ◽  
Inelastic Electron ◽  
Inelastic Electron Scattering ◽  
Ambient Pressure Xps ◽  
Near Ambient Pressure Xps

scholarly journals UV-A light-assisted gas-phase formic acid decomposition on photo-thermo Ru/TiO2 catalyst

2021 ◽  
Author(s):  
Javier Ivanez ◽  
Patricia Garcia-Munoz ◽  
Agnieszka M. Ruppert ◽  
Nicolas Keller
Keyword(s):  
Formic Acid ◽  
Gas Phase ◽  
Acid Decomposition ◽  
Tio2 Catalyst ◽  
Formic Acid Decomposition

scholarly journals High Pressure Photoreduction of CO2: Effect of Catalyst Formulation, Hole Scavenger Addition and Operating Conditions

Catalysts ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 430 ◽  
Author(s):  
Elnaz Bahadori ◽  
Antonio Tripodi ◽  
Alberto Villa ◽  
Carlo Pirola ◽  
Laura Prati ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Formic Acid ◽  
Gas Phase ◽  
Operating Conditions ◽  
Flame Spray ◽  
Co2 Solubility ◽  
Total Consumption ◽  
Solubility In Water ◽  
Hole Scavenger ◽  
Fuels And Chemicals

The photoreduction of CO2 is an intriguing process which allows the synthesis of fuels and chemicals. One of the limitations for CO2 photoreduction in the liquid phase is its low solubility in water. This point has been here addressed by designing a fully innovative pressurized photoreactor, allowing operation up to 20 bar and applied to improve the productivity of this very challenging process. The photoreduction of CO2 in the liquid phase was performed using commercial TiO2 (Evonink P25), TiO2 obtained by flame spray pyrolysis (FSP) and gold doped P25 (0.2 wt% Au-P25) in the presence of Na2SO3 as hole scavenger (HS). The different reaction parameters (catalyst concentration, pH and amount of HS) have been addressed. The products in liquid phase were mainly formic acid and formaldehyde. Moreover, for longer reaction time and with total consumption of HS, gas phase products formed (H2 and CO) after accumulation of significant number of organic compounds in the liquid phase, due to their consecutive photoreforming. Enhanced CO2 solubility in water was achieved by adding a base (pH = 12–14). In basic environment, CO2 formed carbonates which further reduced to formaldehyde and formic acid and consequently formed CO/CO2 + H2 in the gas phase through photoreforming. The deposition of small Au nanoparticles (3–5 nm) (NPs) onto TiO2 was found to quantitatively influence the products distribution and increase the selectivity towards gas phase products. Significant energy storage in form of different products has been achieved with respect to literature results.

scholarly journals New Gas-Phase Catalytic Oxidative Processes for Desulfurization of Diesel Fuel

2015 ◽  
Vol 17 (2) ◽  
pp. 119 ◽  
Author(s):  
Z.R. Ismagilov ◽  
M.A. Kerzhentsev ◽  
S.A. Yashnik ◽  
S.R. Khairulin ◽  
A.V. Salnikov ◽  
...  
Keyword(s):  
Gas Phase ◽  
Diesel Fuel ◽  
Ambient Pressure ◽  
Oxidative Desulfurization ◽  
Sulfur Compounds ◽  
Deep Desulfurization ◽  
Oxidative Processes ◽  
Laboratory Reactor ◽  
Sulfur Containing ◽  
Regeneration Processes

<p>An effective gas-phase oxidative desulfurization (ODS) process was proposed. The process was studied in a laboratory reactor with a proprietary catalyst at 300-400 ºС and ambient pressure with model fuels represented by thiophene, dibenzothiophene (DBT) and 4,6-dimethyldibenzothiophene (DMDBT) dissolved in octane, isooctane or toluene. The reactivity of different sulfur containing molecules in ODS was shown to increase in the sequence: thiophene &lt; DBT &lt; DMDBT. The main sulfur containing product of oxidation of these compounds was SO<sub>2</sub>. During the gas-phase ODS both processes of sulfur species oxidation and processes of their adsorption were observed and studied. Based on the conducted studies, different ODS process designs comprising its integration with adsorption and regeneration processes and with conventional hydrodesulfurization (HDS) process were proposed. One scheme is based on alternating regimes of ODS and catalyst regeneration in two reactors: sulfur is removed from organic feedstock by oxidation and adsorption in one reactor while simultaneous regeneration of the catalyst that has accumulated sulfur  compounds takes place in another reactor. Two other schemes are based on joint use of ODS and HDS. The conventional HDS process is most effective for removal of low-boiling sulfur containing compounds reactive with respect to hydrogen, while removal of refractory sulfur compounds, such as DMDBT is more easily achieved by gas phase ODS. Thus the combination of these processes is expected to be most efficient for deep desulfurization of diesel fuel.</p>

Chemical Modification of the Porous Silicon Surface

1994 ◽  
Vol 358 ◽  
Author(s):  
Eric J. Lee ◽  
James S. Ha ◽  
Michael J. Sailor
Keyword(s):  
Porous Silicon ◽  
Chemical Modification ◽  
Formic Acid ◽  
Gas Phase ◽  
Silicon Surface ◽  
Chemical Vapor ◽  
Luminescence Quenching ◽  
Porous Silicon Surface ◽  
Phase Water ◽  
Surface Modified

ABSTRACTThe porous silicon (PS) surface is derivatized with ethanol, triethylsilanol and formic acid as well as oxidized with water. The two reactions used to prepare these surfaces are discussed, and FTIR spectra of the products are presented. Surface-modified PS retains 10-40% of its original photoluminescence. PS-derivatives display reversible luminescence quenching by gas phase water, ethanol, acetonitrile and benzene. The extent of quenching varies with different PS-derivatives depending on the interaction of the chemical vapor with the modified PS surfaces.

Investigation of gas sensing mechanism of SnO2 based chemiresistor using near ambient pressure XPS

2018 ◽  
Vol 677 ◽  
pp. 284-290 ◽  
Author(s):  
M. Vorokhta ◽  
I. Khalakhan ◽  
M. Vondráček ◽  
D. Tomeček ◽  
M. Vorokhta ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Ambient Pressure ◽  
Sensing Mechanism ◽  
Ambient Pressure Xps ◽  
Near Ambient Pressure Xps

Hard Italian cheese, by near-ambient pressure XPS

2019 ◽  
Vol 26 (1) ◽  
pp. 014015 ◽  
Author(s):  
Tuhin Roychowdhury ◽  
Stephan Bahr ◽  
Paul Dietrich ◽  
Michael Meyer ◽  
Andreas Thißen ◽  
...  
Keyword(s):  
Ambient Pressure ◽  
Ambient Pressure Xps ◽  
Near Ambient Pressure Xps
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