Synthesis of Chromite for Subsequent Carburization by Methane-Hydrogen Gas Mixture

2017 ◽  
pp. 11-19 ◽  
Author(s):  
Vincent Canaguier ◽  
Ingeborg-Helene Svenum ◽  
Leiv Kolbeinsen
Keyword(s):  
Hydrogen Gas ◽  
Gas Mixture

Reduction of perovskite-geikielite by methane–hydrogen gas mixture: Thermodynamic analysis and experimental results

2020 ◽  
Vol 699 ◽  
pp. 134355 ◽  
Author(s):  
Run Zhang ◽  
Jie Dang ◽  
Dong Liu ◽  
Zepeng Lv ◽  
Gangqiang Fan ◽  
...  
Keyword(s):  
Thermodynamic Analysis ◽  
Hydrogen Gas ◽  
Experimental Results ◽  
Gas Mixture

scholarly journals Relationship between Stationary and Mobile Phase Composition and its Influence on the Retention Time of Some Analytes in Gas Chromatography

2000 ◽  
Vol 18 (4) ◽  
pp. 323-331
Author(s):  
R. Nasuto
Keyword(s):  
Gas Chromatography ◽  
Mobile Phase ◽  
Hydrogen Gas ◽  
Gas Mixture ◽  
Frontal Analysis ◽  
Mobile Phase Composition ◽  
Column Packing ◽  
Chromatographic Process ◽  
Mobile Phase Modifier ◽  
Methanol Vapour

A binary methanol vapour/hydrogen gas mixture has been used as the mobile phase in gas chromatography. Through the use of modified frontal analysis (undertaken just before measurements of the retention of the tested analytes), it has been possible to determine the adsorption isotherm of the mobile phase modifier (methanol) under typical conditions for a chromatographic process. It was found that adsorption of the mobile phase modifier on the column packing surface caused a decrease in the retention times of all the analytes tested. Furthermore, as a result of such adsorption, an increase in the degree of hydrophobization of the column packing surface also occurred, leading to a decrease of the selectivity of the packing.

Polarity Control of CVD Grown 3C-SiC on Si(111)

2011 ◽  
Vol 679-680 ◽  
pp. 91-94
Author(s):  
Jörg Pezoldt ◽  
Bernd Schröter
Keyword(s):  
Atmospheric Pressure ◽  
Vapour Deposition ◽  
Chemical Vapour ◽  
Hydrogen Gas ◽  
Gas Mixture ◽  
Surface Polarity ◽  
Polar Material ◽  
Face Surface ◽  
First Case ◽  
Low Pressures

XPD and XRD measurements revealed a difference in the crystallographic polarity of 3C-SiC(111) grown on Si(111) carbonized by ethene diluted in hydrogen at atmospheric pressure in a rapid thermal chemical vapour deposition reactor and the crystallographic polarity of 3C-SiC(111) formed in an ethene hydrogen gas mixture at low pressures. In the first case C-face polar material was formed, whereas in the second case the grown expitaxial layer exhibits Si-face surface polarity.

Hydrogen gas mixture separation by CVD silica membrane

2008 ◽  
Vol 323 (1) ◽  
pp. 144-147 ◽  
Author(s):  
S GOPALAKRISHNAN ◽  
J DINIZDACOSTA
Keyword(s):  
Hydrogen Gas ◽  
Gas Mixture ◽  
Silica Membrane ◽  
Mixture Separation

Using Polysulfone Hollow-Fiber Member to Separate H2 from Petrochemical Process Tail Gas

2013 ◽  
Vol 749 ◽  
pp. 466-470
Author(s):  
Ching Kuei Hsu ◽  
Chien Li Lee ◽  
Chih Ju G. Jou
Keyword(s):  
Hydrogen Concentration ◽  
Hollow Fiber ◽  
Gas Diffusion ◽  
Hydrogen Gas ◽  
Gas Mixture ◽  
Operating Pressure ◽  
Petrochemical Process ◽  
Series Connection ◽  
Recovery Method ◽  
In Series

The rate of gas diffusion is inversely proportional to the gas molecule diameter; hydrogen gas molecular has smaller diameter and thus it has a greater diffusion coefficient than methane. Results of laboratory studies shown that when a gas mixture consisting of H2/CH4 = 30:70 is treated in a Hollow-fiber member under 5 kg/cm2, the hydrogen concentration is raised from 30 mol% to 71 mol%. If the Hollow-fiber member is re-arranged in series connection without controlling the operating pressure (free permeation), the recovered hydrogen concentration can be as high as 88 mol%. Additionally, using H2/CH4 = 50:50 as the influent gas mixture and controlling the influent pressure at 5 kg/cm2, the resulting hydrogen concentration can be raised from 50 mol% to 92 mol%, if the Hollow-fiber member is re-arranged in series connection without controlling the permeating pressure (free permeation), the recovered hydrogen concentration can reach 94 mol%. Therefore, Hollow-fiber member can be implemented to recover hydrogen gas from the hydrogen-rich petrochemical process tail gas at low pressure; the recovered hydrogen can be further utilized with higher add-on value. This hydrogen-recovery method has the advantage of low capital cost, simple to operate and small energy consumption.

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