Determination of Absolute Product Branching Ratios in Mass Spectrometric Experiments:  Detecting Acetyl Radicals at CH2CO+

1996 ◽  
Vol 100 (13) ◽  
pp. 5200-5204 ◽  
Author(s):  
D. C. Kitchen ◽  
T. L. Myers ◽  
L. J. Butler
Keyword(s):  
Branching Ratios ◽  
Mass Spectrometric ◽  
Product Branching

Determination of the rate constant and of product branching ratios in the reaction of CH3O2 with OCl between 233 and 300 K

1994 ◽  
Vol 98 (10) ◽  
pp. 1298-1302 ◽  
Author(s):  
A. S. Kukui ◽  
T. P. W. Jungkamp ◽  
R. N. Schindler
Keyword(s):  
Rate Constant ◽  
Branching Ratios ◽  
Product Branching

Measurements of the absolute concentrations of hydrogen atom and hydroxyl produced in the silyl + oxygen reaction: determination of the product branching ratios

1993 ◽  
Vol 97 (17) ◽  
pp. 4473-4478 ◽  
Author(s):  
Mitsuo Koshi ◽  
Nobuhiro Nishida ◽  
Yoshinori Murakami ◽  
Hiroyuki Matsui
Keyword(s):  
Hydrogen Atom ◽  
Branching Ratios ◽  
Absolute Concentrations ◽  
The Absolute ◽  
Product Branching ◽  
Oxygen Reaction

Tandem Mass Spectrometric Evaluation of Core Structures of Aromatic Compounds after Catalytic Deoxygenation

2017 ◽  
Author(s):  
Xueming Dong
Keyword(s):  
Aromatic Compounds ◽  
Supported Catalyst ◽  
Mass Spectrometric ◽  
Spectrometric Method ◽  
Mass Spectrometric Method ◽  
Aromatic Rings ◽  
Tandem Mass Spectrometric ◽  
Catalytic Deoxygenation ◽  
Oxygen Atoms

Catalytic deoxygenation of coal enhances the stability and combustion performance of coal-derived liquids. However, determination of the selectivity of removal of oxygen atoms incorporated in or residing outside of aromatic rings is challenging. This limits the ability to evaluate the success of catalytic deoxygenation processes. A mass spectrometric method, in-source collision-activated dissociation (ISCAD), combined with high resolution product ion detection, is demonstrated to allow the determination of whether the oxygen atoms in aromatic compounds reside outside of aromatic rings or are part of the aromatic system, because alkyl chains can be removed from aromatic cores via ISCAD. Application of this method for the analysis of a subbituminous coal treated using a supported catalyst revealed that the catalytic treatment reduced the number of oxygen-containing heteroaromatic rings but not the number of oxygen atoms residing outside the aromatic rings.<br>

Tandem Mass Spectrometric Evaluation of Core Structures of Aromatic Compounds after Catalytic Deoxygenation

2017 ◽  
Author(s):  
Xueming Dong
Keyword(s):  
Aromatic Compounds ◽  
Supported Catalyst ◽  
Mass Spectrometric ◽  
Spectrometric Method ◽  
Mass Spectrometric Method ◽  
Aromatic Rings ◽  
Tandem Mass Spectrometric ◽  
Catalytic Deoxygenation ◽  
Oxygen Atoms

Catalytic deoxygenation of coal enhances the stability and combustion performance of coal-derived liquids. However, determination of the selectivity of removal of oxygen atoms incorporated in or residing outside of aromatic rings is challenging. This limits the ability to evaluate the success of catalytic deoxygenation processes. A mass spectrometric method, in-source collision-activated dissociation (ISCAD), combined with high resolution product ion detection, is demonstrated to allow the determination of whether the oxygen atoms in aromatic compounds reside outside of aromatic rings or are part of the aromatic system, because alkyl chains can be removed from aromatic cores via ISCAD. Application of this method for the analysis of a subbituminous coal treated using a supported catalyst revealed that the catalytic treatment reduced the number of oxygen-containing heteroaromatic rings but not the number of oxygen atoms residing outside the aromatic rings.<br>

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