Analysis of Petroleum Aromatics by Laser-Induced Acoustic Desorption/Tunable Synchrotron Vacuum Ultraviolet Photoionization Mass Spectrometry

2013 ◽  
Vol 27 (4) ◽  
pp. 2010-2017 ◽  
Author(s):  
Juan Chen ◽  
Liangyuan Jia ◽  
Lianming Zhao ◽  
Xiaoqing Lu ◽  
Wenyue Guo ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Vacuum Ultraviolet ◽  
Photoionization Mass Spectrometry ◽  
Acoustic Desorption

Vacuum ultraviolet photochemistry of the conformers of the ethyl peroxy radical

2021 ◽  
Vol 23 (38) ◽  
pp. 22096-22102
Author(s):  
Zuoying Wen ◽  
Xiaoxiao Lin ◽  
Xiaofeng Tang ◽  
Bo Long ◽  
Chengcheng Wang ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Vacuum Ultraviolet ◽  
Theoretical Calculations ◽  
Peroxy Radical ◽  
Photoionization Mass Spectrometry ◽  
Condon Factors ◽  
Vuv Photoionization ◽  
Franck Condon

C2H5O2 plus its gauche and trans conformers are studied using synchrotron-based VUV photoionization mass spectrometry and theoretical calculations, and it is found that the gauche conformer has favorable Franck–Condon factors in photoionization.

scholarly journals An experimental study of indene pyrolysis with synchrotron vacuum ultraviolet photoionization mass spectrometry

2019 ◽  
Vol 21 (10) ◽  
pp. 5510-5520 ◽  
Author(s):  
Hanfeng Jin ◽  
Jiuzhong Yang ◽  
Lili Xing ◽  
Junyu Hao ◽  
Yan Zhang ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Experimental Study ◽  
Polycyclic Aromatic Hydrocarbons ◽  
Aromatic Hydrocarbons ◽  
Vacuum Ultraviolet ◽  
Photoionization Mass Spectrometry ◽  
Polycyclic Aromatic

Formation of polycyclic aromatic hydrocarbons driven by indenyl reactions is experimentally measured by synchrotron vacuum ultraviolet photoionization mass spectrometry.

scholarly journals Elucidating the differences in oxidation of high-performance α- and β- diisobutylene biofuels via Synchrotron photoionization mass spectrometry

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Anthony Carmine Terracciano ◽  
Sneha Neupane ◽  
Denisia M. Popolan-Vaida ◽  
Richard G. Blair ◽  
Nils Hansen ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Residence Time ◽  
High Performance ◽  
Vacuum Ultraviolet ◽  
Olefinic Bond ◽  
Transportation Fuels ◽  
Photoionization Mass Spectrometry ◽  
Flight Mass Spectrometry ◽  
Auto Ignition ◽  
Combustion Properties

AbstractBiofuels are a promising ecologically viable and renewable alternative to petroleum fuels, with the potential to reduce net greenhouse gas emissions. However, biomass sourced fuels are often produced as blends of hydrocarbons and their oxygenates. Such blending complicates the implementation of these fuels in combustion applications. Variations in a biofuel’s composition will dictate combustion properties such as auto ignition temperature, reaction delay time, and reaction pathways. A handful of novel drop-in replacement biofuels for conventional transportation fuels have recently been down selected from a list of over 10,000 potential candidates as part of the U.S. Department of Energy’s (DOE) Co-Optimization of Fuels and Engines (Co-Optima) initiative. Diisobutylene (DIB) is one such high-performing hydrocarbon which can readily be produced from the dehydration and dimerization of isobutanol, produced from the fermentation of biomass-derived sugars. The two most common isomers realized, from this process, are 2,4,4-trimethyl-1-pentene (α-DIB) and 2,4,4-trimethyl-2-pentene (β-DIB). Due to a difference in olefinic bond location, the α- and β- isomer exhibit dramatically different ignition temperatures at constant pressure and equivalence ratio. This may be attributed to different fragmentation pathways enabled by allylic versus vinylic carbons. For optimal implementation of these biofuel candidates, explicit identification of the intermediates formed during the combustion of each of the isomers is needed. To investigate the combustion pathways of these molecules, tunable vacuum ultraviolet (VUV) light (in the range 8.1–11.0 eV) available at the Lawrence Berkeley National Laboratory’s Advanced Light Source (ALS) has been used in conjunction with a jet stirred reactor (JSR) and time-of-flight mass spectrometry to probe intermediates formed. Relative intensity curves for intermediate mass fragments produced during this process were obtained. Several important unique intermediates were identified at the lowest observable combustion temperature with static pressure of 93,325 Pa and for 1.5 s residence time. As this relatively short residence time is just after ignition, this study is targeted at the fuels’ ignition events. Ignition characteristics for both isomers were found to be strongly dependent on the kinetics of C4 and C7 fragment production and decomposition, with the tert-butyl radical as a key intermediate species. However, the ignition of α-DIB exhibited larger concentrations of C4 compounds over C7, while the reverse was true for β-DIB. These identified species will allow for enhanced engineering modeling of fuel blending and engine design.

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