scholarly journals Gas phase selective propylene epoxidation over La2O3-supported cubic silver nanoparticles

2019 ◽  
Vol 9 (13) ◽  
pp. 3435-3444 ◽  
Author(s):  
Bin Yu ◽  
Tuğçe Ayvalı ◽  
Zhi-Qiang Wang ◽  
Xue-Qing Gong ◽  
Abdulaziz A. Bagabas ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Gas Phase ◽  
Propylene Oxide ◽  
Atomic Oxygen ◽  
Propylene Epoxidation ◽  
Phase Oxidation ◽  
Gas Phase Oxidation ◽  
Ag Nanocube ◽  
Enhanced Selectivity

It is shown that the Ag nanocube/La2O3 interface catalyses gas phase oxidation of propylene to propylene oxide cooperatively with enhanced selectivity and conversion. Dioxygen is preferentially activated and dissociated by La2O3(001) and the active atomic oxygen over the Ag(100) facet leads to selective propylene epoxidation.

Propylene epoxidation in the gas-phase oxidation of propane-propylene mixtures

1982 ◽  
Vol 21 (3) ◽  
pp. 347-350 ◽  
Author(s):  
R. R. Grigoryan ◽  
S. D. Arsentiev ◽  
A. A. Mantashyan
Keyword(s):  
Gas Phase ◽  
Propylene Epoxidation ◽  
Phase Oxidation ◽  
Gas Phase Oxidation

Direct Gas-Phase Oxidation of Propylene to Acetone in the Presence of H2 and O2 over Au/TS-1 Catalyst

2020 ◽  
Vol 17 (8) ◽  
pp. 685-690
Author(s):  
Jinsong Fu ◽  
Xiaoming Zhang ◽  
Wuyang Liang ◽  
Qian Lei ◽  
Bing Sun ◽  
...  
Keyword(s):  
Gas Phase ◽  
Reaction Temperature ◽  
Propylene Oxide ◽  
Lewis Base ◽  
Nanoparticle Size ◽  
Au Nanoparticle ◽  
High Reaction ◽  
Phase Oxidation ◽  
Gas Phase Oxidation

A novel process for the preparation of acetone is reported by gas-phase oxidation of propylene in the presence of H2 and O2 with Au supported TS-1 catalyst (Au/TS-1). By elevating the reaction temperature to 280 oC, Au/TS-1 catalyzes 11.6% propylene generating acetone with 70.6% selectivity, and 8.2% acetone in onepass yield. Acetone is originated from propylene oxide isomerization, which is mainly attributed to the surface of the Lewis base and high reaction temperature. Furthermore, small Au nanoparticle size promotes the reaction.

Gas phase oxidation of furfural to maleic anhydride on V 2 O 5 /γ-Al 2 O 3 catalysts: Reaction conditions to slow down the deactivation

2017 ◽  
Vol 348 ◽  
pp. 265-275 ◽  
Author(s):  
N. Alonso-Fagúndez ◽  
M. Ojeda ◽  
R. Mariscal ◽  
J.L.G. Fierro ◽  
M. López Granados
Keyword(s):  
Maleic Anhydride ◽  
Gas Phase ◽  
Reaction Conditions ◽  
Phase Oxidation ◽  
Gas Phase Oxidation

scholarly journals Volatility of secondary organic aerosol during OH radical induced ageing

2011 ◽  
Vol 11 (21) ◽  
pp. 11055-11067 ◽  
Author(s):  
K. Salo ◽  
M. Hallquist ◽  
Å. M. Jonsson ◽  
H. Saathoff ◽  
K.-H. Naumann ◽  
...  
Keyword(s):  
Gas Phase ◽  
Organic Aerosol ◽  
Oh Radical ◽  
High Concentration ◽  
Volatile Material ◽  
Phase Oxidation ◽  
Gas Phase Oxidation ◽  
Institute Of Technology ◽  
Set Up ◽  
Pinic Acid

Abstract. The aim of this study was to investigate oxidation of SOA formed from ozonolysis of α-pinene and limonene by hydroxyl radicals. This paper focuses on changes of particle volatility, using a Volatility Tandem DMA (VTDMA) set-up, in order to explain and elucidate the mechanism behind atmospheric ageing of the organic aerosol. The experiments were conducted at the AIDA chamber facility of Karlsruhe Institute of Technology (KIT) in Karlsruhe and at the SAPHIR chamber of Forchungzentrum Jülich (FZJ) in Jülich. A fresh SOA was produced from ozonolysis of α-pinene or limonene and then aged by enhanced OH exposure. As an OH radical source in the AIDA-chamber the ozonolysis of tetramethylethylene (TME) was used while in the SAPHIR-chamber the OH was produced by natural light photochemistry. A general feature is that SOA produced from ozonolysis of α-pinene and limonene initially was rather volatile and becomes less volatile with time in the ozonolysis part of the experiment. Inducing OH chemistry or adding a new portion of precursors made the SOA more volatile due to addition of new semi-volatile material to the aged aerosol. The effect of OH chemistry was less pronounced in high concentration and low temperature experiments when lower relative amounts of semi-volatile material were available in the gas phase. Conclusions drawn from the changes in volatility were confirmed by comparison with the measured and modelled chemical composition of the aerosol phase. Three quantified products from the α-pinene oxidation; pinonic acid, pinic acid and methylbutanetricarboxylic acid (MBTCA) were used to probe the processes influencing aerosol volatility. A major conclusion from the work is that the OH induced ageing can be attributed to gas phase oxidation of products produced in the primary SOA formation process and that there was no indication on significant bulk or surface reactions. The presented results, thus, strongly emphasise the importance of gas phase oxidation of semi- or intermediate-volatile organic compounds (SVOC and IVOC) for atmospheric aerosol ageing.

Experimental and Modeling Study of the Selective Homogeneous Gas Phase Oxidation of Methane to Methanol

1995 ◽  
Vol 34 (4) ◽  
pp. 1044-1059 ◽  
Author(s):  
Rune Lodeng ◽  
Odd A. Lindvaag ◽  
Paal Soraker ◽  
Per T. Roterud ◽  
Olav T. Onsager
Keyword(s):  
Gas Phase ◽  
Oxidation Of Methane ◽  
Phase Oxidation ◽  
Gas Phase Oxidation ◽  
Modeling Study

Effect of Vanadia Doping and Its Oxidation State on the Photocatalytic Activity of TiO2 for Gas-Phase Oxidation of Ethene

2008 ◽  
Vol 112 (48) ◽  
pp. 19102-19112 ◽  
Author(s):  
K. Bhattacharyya ◽  
S. Varma ◽  
A. K. Tripathi ◽  
S. R. Bharadwaj ◽  
A. K. Tyagi
Keyword(s):  
Photocatalytic Activity ◽  
Gas Phase ◽  
Oxidation State ◽  
Phase Oxidation ◽  
Gas Phase Oxidation
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