A Direct Sampling Mass Spectrometer Investigation of Oxidation Mechanisms for Acetic Acid in Supercritical Water

2001 ◽  
Vol 105 (24) ◽  
pp. 5860-5867 ◽  
Author(s):  
Sean P. Maharrey ◽  
David R. Miller
Keyword(s):  
Acetic Acid ◽  
Mass Spectrometer ◽  
Supercritical Water ◽  
Direct Sampling ◽  
Oxidation Mechanisms

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.

Effect of Acetic Acid Addition on Decomposition of Xylose in Supercritical Water

2018 ◽  
Vol 32 (2) ◽  
pp. 1754-1760 ◽  
Author(s):  
Tanawan Chalermsaktrakul ◽  
Yukihiko Matsumura
Keyword(s):  
Acetic Acid ◽  
Supercritical Water ◽  
Acid Addition

Supercritical Water Oxidation – Wastewaters and Sludges

1991 ◽  
Vol 23 (1-3) ◽  
pp. 389-398 ◽  
Author(s):  
Abdullah Shanableh ◽  
Earnest F. Gloyna
Keyword(s):  
Acetic Acid ◽  
Supercritical Water ◽  
Water Oxidation ◽  
Biological Treatment ◽  
Treatment Plant ◽  
Transformation Products ◽  
Pilot Scale ◽  
Supercritical Water Oxidation ◽  
Temperature And Pressure ◽  
Dimethyl Phenol

Environmental contaminants can be eliminated through the use of SCWO techniques. A comprehensive supercritical oxidation (SCWO) research laboratory, including bench and pilot-scale facilities has been developed. High temperature and pressure systems slightly less than and greater than supercritical water conditions can be used for the efficient destruction of waste biological treatment plant sludges, acetic acid, 2-nitro phenol, 2,4-dimethyl phenol, phenol, and 2,4-dinitro toluene. Above 400 °C, near complete destruction of sludge and transformation compounds such as acetic acid can be achieved with relatively short residence times. Ammonia and acetic acid are transformation products in the SCWO of biological treatment plant sludges. Acetic acid produced from the oxidation of sludge is oxidized rapidly at supercritical temperatures, 400 °C to 450 °C.

Catalytic oxidation of acetic acid over sodium titanate synthesized hydrothermally in supercritical water

2011 ◽  
Author(s):  
Fumitake Takahashi ◽  
Zhirong Sun ◽  
Kensuke Fukushi ◽  
Yoshito Oshima ◽  
Kazuo Yamamoto
Keyword(s):  
Acetic Acid ◽  
Catalytic Oxidation ◽  
Supercritical Water ◽  
Sodium Titanate

scholarly journals Chemical ionisation quadrupole mass spectrometer with an electrical discharge ion source for atmospheric trace gas measurement

2018 ◽  
Author(s):  
Philipp G. Eger ◽  
Frank Helleis ◽  
Gerhard Schuster ◽  
Gavin J. Phillips ◽  
Jos Lelieveld ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Mass Spectrometer ◽  
Ion Source ◽  
Quadrupole Mass Spectrometer ◽  
Rf Discharge ◽  
Data Sets ◽  
Quadrupole Mass ◽  
Ion Chemistry ◽  
Ion Molecule Reactions ◽  
Chemical Ionisation

Abstract. We present a Chemical Ionisation Quadrupole Mass Spectrometer (CI-QMS) with radio-frequency (RF) discharge ion source through N2/CH3I as source of primary ions. In addition to the expected detection of PAN, peracetic acid and ClNO2 through well-established ion-molecule-reactions with I- and its water cluster, the instrument is also sensitive to SO2, HCl and acetic acid (CH3C(O)OH) through additional ion chemistry unique for our ion source. We present ionisation schemes for detection of SO2, HCl and acetic acid along with illustrative data sets from three different field campaigns underlining the potential of the CI-QMS with an RF discharge ion source as an alternative to 210Po. The additional sensitivity to SO2 and HCl makes the CI-QMS suitable for investigating the role of sulphur and chlorine chemistry in the polluted marine and coastal boundary layer.

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