A computational view on vapour phase coagulation of nanoparticles synthesized by atmospheric pressure PECVD

2015 ◽  
Vol 12 (7) ◽  
pp. 891-903 ◽  
Author(s):  
Maxim V. Mishin ◽  
Kirill Y. Zamotin ◽  
Vera S. Protopopova ◽  
Andrey A. Uvarov ◽  
Leonid A. Filatov ◽  
...  
Keyword(s):  
Atmospheric Pressure ◽  
Vapour Phase

Stationary flames of methyl nitrate and methyl nitrite

1955 ◽  
Vol 232 (1190) ◽  
pp. 389-403 ◽  
Keyword(s):  
Nitric Oxide ◽  
Atmospheric Pressure ◽  
Burning Velocity ◽  
Vapour Phase ◽  
Main Reaction ◽  
Methyl Nitrite ◽  
Nitrate Esters ◽  
Methyl Nitrate ◽  
Low Pressures ◽  
Ethyl Nitrite

Methyl nitrate (CH 3 ONO 2 ) is the most explosive of the nitrate esters, and previous studies have been confined mainly to the slow thermal decomposition, and to the vapour phase explosion at low pressures in closed vessels. A stationary decomposition flame has now been maintained and studied spectrographically. A t low pressures the zones of reaction are clearly separated. From the early stages of the flame strong formaldehyde bands are emitted. This decomposition flame has been successfully simulated in artificial mixtures of methyl nitrite with oxygen. The results obtained are in accord with the preliminary fission of the nitrate molecule in the pre-heat zone of the flame: CH 3 ONO 2 →CH 3 O + NO 2 . The combustion flame of m ethyl nitrate with oxygen, nitric oxide and nitrogen dioxide has also been examined at low pressures. At atmospheric pressure, m ethyl nitrite (CH 3 ONO) has been found to support a decomposition flame of very small burning velocity. However, the combustion of m ethyl nitrite with oxygen at atmospheric pressure is an extremely fast and vigorous flame. It has been observed in both pre-mixed and diffusion systems and information about the changes occurring in it have been obtained by absorption and emission spectroscopy. All the experimental results may be interpreted in terms of two general principles: the reluctance of nitric oxide to react except at high temperatures and pressures and the frequent occurrence in flames of extensive pyrolytic reactions before the main reaction zone is reached.

scholarly journals Dependency of Phenol Hydrogenation Activity on Hydrogen Chemisorption over Supported Palladium Catalysts

1997 ◽  
Vol 15 (3) ◽  
pp. 165-172 ◽  
Author(s):  
Nagendranath Mahata ◽  
V. Vishwanathan
Keyword(s):  
Atmospheric Pressure ◽  
Palladium Catalysts ◽  
Hydrogen Adsorption ◽  
Vapour Phase ◽  
Hydrogen Chemisorption ◽  
Hydrogenation Activity ◽  
Phenol Hydrogenation ◽  
Acidic Sites ◽  
Supported Palladium ◽  
Increasing Temperature

A series of catalysts containing 1 wt.% Pd supported on various oxides of commercial origin have been characterised by hydrogen adsorption at 298 K and evaluated for vapour-phase phenol hydrogenation at 473 K employing an H/phenol ratio of 5.4 at atmospheric pressure. The activity of phenol hydrogenation showed a dependence on the irreversible uptake of hydrogen. Among the catalysts studied, Pd/Al2O3 showed a decrease in activity with increasing temperature while Pd/MgO passed through a maximum at 503 K. The Pd/MgO catalysts exhibited a higher dispersion of smaller Pd crystallites leading to higher activity and total selectivity for cyclohexanone. The higher resistance towards deactivation and better stability of the Pd/MgO catalysts suggest that the acidic sites of alumina may be responsible for deactivation, thereby accounting for the lowering of activity with Pd/Al2O3 catalysts.

ZrO2/SBA-15 as an efficient catalyst for the production of γ-valerolactone from biomass-derived levulinic acid in the vapour phase at atmospheric pressure

RSC Advances ◽  
2016 ◽  
Vol 6 (24) ◽  
pp. 20230-20239 ◽  
Author(s):  
Siva Sankar Enumula ◽  
Venkata Ramesh Babu Gurram ◽  
Murali Kondeboina ◽  
David Raju Burri ◽  
Seetha Rama Rao Kamaraju
Keyword(s):  
Atmospheric Pressure ◽  
Levulinic Acid ◽  
Vapour Phase ◽  
Transfer Hydrogenation ◽  
Good Activity ◽  
Catalytic Transfer Hydrogenation ◽  
Efficient Catalyst ◽  
Catalytic Transfer

25 weight% ZrO2/SBA-15 catalyst exhibits good activity in the catalytic transfer hydrogenation of levulinic acid under vapour phase conditions at atmospheric pressure.

Atmospheric pressure vapour phase decomposition: A proof of principle

Talanta ◽  
2012 ◽  
Vol 101 ◽  
pp. 148-150 ◽  
Author(s):  
Amedeo Cinosi ◽  
Nunzio Andriollo ◽  
Francesca Tibaldi ◽  
Damiano Monticelli
Keyword(s):  
Atmospheric Pressure ◽  
Vapour Phase ◽  
Phase Decomposition ◽  
Proof Of Principle

Vapour phase hydrocyclisation of levulinic acid to γ-valerolactone over supported Ni catalysts

2014 ◽  
Vol 4 (5) ◽  
pp. 1253-1259 ◽  
Author(s):  
Varkolu Mohan ◽  
Velpula Venkateshwarlu ◽  
Chodimella Venkata Pramod ◽  
Burri David Raju ◽  
Kamaraju Seetha Rama Rao
Keyword(s):  
Atmospheric Pressure ◽  
Levulinic Acid ◽  
Vapour Phase ◽  
Quantitative Yield ◽  
Ni Catalysts ◽  
Supported Ni Catalysts ◽  
Supported Ni

A Ni/SiO2 catalyst is found to be effective for the hydrogenation of levulinic acid to yield γ-valerolactone with a quantitative yield in vapour phase conditions at atmospheric pressure without any additives.

Direct ethanol condensation to diethyl acetal in the vapour phase at atmospheric pressure over CuNP/SBA-15 catalysts

2019 ◽  
Vol 43 (25) ◽  
pp. 10003-10011 ◽  
Author(s):  
Gidyonu Paleti ◽  
Nagaiah Peddinti ◽  
Naveen Gajula ◽  
Vasikerappa Kadharabenchi ◽  
Kamaraju Seetha Rama Rao ◽  
...  
Keyword(s):  
Atmospheric Pressure ◽  
Vapour Phase ◽  
Diethyl Acetal ◽  
Bioethanol Production ◽  
Fuel Additives ◽  
Biomass Valorization ◽  
Selective Conversion ◽  
Increasing Demand

Of the biomass valorization technologies, bioethanol production and its selective conversion to diethyl acetal is of utmost importance to meet the increasing demand for bio-fuel additives.

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