Experimental Study of Probe-Induced Distortions in Molecular-Beam Mass-Spectrometer Sampling from Flames

1981 ◽  
pp. 867-881
Keyword(s):  
Experimental Study ◽  
Mass Spectrometer ◽  
Molecular Beam ◽  
Mass Spectrometer Sampling

scholarly journals Molecular beam mass spectrometer sampling of flash ignited combustion

1985 ◽  
Vol 20 (1) ◽  
pp. 1205-1212 ◽  
Author(s):  
D. Lucas ◽  
R. Peterson ◽  
N.J. Brown ◽  
A.K. Oppenheim
Keyword(s):  
Mass Spectrometer ◽  
Molecular Beam ◽  
Mass Spectrometer Sampling

scholarly journals Experimental Study On Pyrolysis of Rice Straw Catalyzed By CaO/Al2O3-Phosphate Mixture

2021 ◽  
Author(s):  
Lianlian Xu ◽  
Zhongwen Xu ◽  
Feng Zhang ◽  
Yinmei Yuan ◽  
Bin Cheng ◽  
...  
Keyword(s):  
Experimental Study ◽  
Gas Chromatography ◽  
Acetic Acid ◽  
Rice Straw ◽  
Mass Spectrometer ◽  
Synergistic Effects ◽  
Pyrolysis Gas ◽  
Pyrolysis Gas Chromatography ◽  
Dehydration Reactions ◽  
Bio Oil

Abstract This paper studied the synergistic effects of CaO or Al2O3 and three potassium phosphates (e.g., KH2PO4, K2HPO4·3H2O and K3PO4·3H2O) in the rice stalk pyrolysis through pyrolysis-gas chromatography-mass spectrometer (Py-GC/MS) experiments. The results show that after co-catalyzed by CaO/Al2O3 and potassium phosphates, the total contents of phenols, aldehydes, acids, LG from most samples decrease and those of ketones increase compared with those catalyzed by potassium phosphates alone. CaO/Al2O3 and potassium phosphates show synergistic effects in the regulation of the types or contents of phenols, ketones, aldehydes, etc. and are suitable for the production of ketone-rich bio-oil. Dehydration reactions, etc. are further promoted under the co-catalysis of the two catalysts, and some phenols can be converted to benzene products, etc. The contents of acetic acid can decrease to 0. For 50% K3PO4.3H2O impregnated sample, the yields of furans reduce sharply after CaO addition. For most impregnated samples except 50% K2HPO4·3H2O sample and 30%, 50% K3PO4.3H2O, the contents of total furans and furfural increase after Al2O3 addition.

The lifetime of hydrogen adsorbed on a slightly oxidized nickel surface

1957 ◽  
Vol 240 (1222) ◽  
pp. 423-436 ◽  
Keyword(s):  
Oxide Film ◽  
Mass Spectrometer ◽  
Rate Constant ◽  
Molecular Beam ◽  
Copper Surface ◽  
Solid Surfaces ◽  
Nickel Surface ◽  
Order Process ◽  
Adsorbed Molecules ◽  
First Order

A method for investigating the lifetimes of adsorbed molecules on solid surfaces is described. A molecular beam of hydrogen was projected on to the surface of a spinning nickel disk, and the hydrogen evaporating from the surface at different times after deposition was collected and measured with a mass spectrometer. On a slightly oxidized nickel surface all the hydrogen was adsorbed. The subsequent evaporation was a first-order process with a rate constant of 4·5 x 10 11 exp ( -11·5 kcal/ RT ) S -1 . With a mixed molecular beam of hydrogen and deuterium no exchange was produced by the adsorption, which is considered to be molecular. Attempts to remove the oxide film from the nickel surface gave an un­stable surface on which no clear results were obtained. The lifetime of hydrogen on a copper surface was too short to measure.

Molecular beam facility for studying mass spectrometer performance

1981 ◽  
Vol 52 (7) ◽  
pp. 1016-1024 ◽  
Author(s):  
John O. Ballenthin ◽  
Alfred O. Nier
Keyword(s):  
Mass Spectrometer ◽  
Molecular Beam
Sign in / Sign up

Export Citation Format

Share Document