A method for the quantitative analysis of gaseous mixtures by online mass spectrometry

Cheng, Zaizhe; Mozammel, Tibra; Patel, Jim; Lee, Woojin; Huang, Shouying; Lim, Seng; Ma, Xinbin; Bhargava, Suresh K.

doi:10.1016/j.ijms.2018.09.002

Cited by 8 publications

(28 citation statements)

References 16 publications

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“…It is known that in the theory of mass spectral analysis, the use of coefficients obtained during calibration does not lead to unambiguous results [5].…”

Section: The Problem Of Calibration Coefficientsmentioning

confidence: 99%

“…Perhaps the values of the coefficients are influenced by the way the substance enters the carrier gas: during calibration, the substance to be determined is introduced by entering with a calibration gas syringe, and in the experiment by decomposing the substance. Also, the calibration is highly dependent on the operating conditions of the quadrupole mass spectrometer [5]. Due to the fact that the exact duplication of all the above parameters from calibration to experiment is difficult, the calibration factors should be determined from the results of the experiment itself.…”

Section: The Problem Of Calibration Coefficientsmentioning

confidence: 99%

“…The mass ratio in the mass spectrum has a high reproducibility and is determined by the strength of the electron impact, which is usually equal to 70 eV, therefore there are libraries of mass spectra of various compounds that identify individual compounds, for example, the NIST mass spectra library. However, the mass spectral signal is influenced by the parameters of the instrument itself, and because of this, it is recommended in [5] to refer to the library supplied by the manufacturer of the mass spectrometer, since the values for different devices are quite different. Mass spectrometry differs from other methods in that in it the charged molecules (ions) are separated by their masses.…”

Section: The Matrix Of Relative Intensity Of the Gas Component Mixturementioning

confidence: 99%

“…In the second case, it is assumed that on other m/z with higher relative intensities for this component its current is blocked by currents from other components. The value of the ion current generated by the electron impact of the secondary fragments can be very low, so there is a problem of identifying the component when its base number overlaps with other components, especially when the concentration of the component is low [5].…”

Section: The Matrix Of Relative Intensity Of the Gas Component Mixturementioning

confidence: 99%

“…A significant amount of work using this method is aimed at studying the dependencies of the yield of combustion products of various fuels on conditions such as heating rate, gas environment, the presence of chemical reagents, etc. [4][5][6]. Figure 1 shows a schematic depiction of a thermal analysis instrument combined with a mass spectrometer (TA-MS).…”

Section: Formulation Of the Problem 1introductionmentioning

confidence: 99%

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Algorithm for the interpretation of mass spectra in the study of thermochemical conversion of lignocellulosic raw materials using complex combined thermal analysis

2019

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“…It is known that in the theory of mass spectral analysis, the use of coefficients obtained during calibration does not lead to unambiguous results [5].…”

Section: The Problem Of Calibration Coefficientsmentioning

confidence: 99%

Section: The Problem Of Calibration Coefficientsmentioning

confidence: 99%

Section: The Matrix Of Relative Intensity Of the Gas Component Mixturementioning

confidence: 99%

Section: The Matrix Of Relative Intensity Of the Gas Component Mixturementioning

confidence: 99%

Section: Formulation Of the Problem 1introductionmentioning

confidence: 99%

See 3 more Smart Citations

Algorithm for the interpretation of mass spectra in the study of thermochemical conversion of lignocellulosic raw materials using complex combined thermal analysis

2019

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Development of quantitative detection method for mass spectrometry coupled to an infrared laser spectroscope (Picarro) to monitor in nitrogen matrix a complex gas mixture of H₂, He, CO, N₂, Ne, O₂, Ar, CO₂, H₂S, CH₄, C₂H₄, C₂H₆, C₃H₆, C₃H₈, i‐C₄H₁₀, n‐C₄H₁₀, and C₅H₁₂

Keita¹,

Noirez

Berthe

et al. 2023

Rapid Comm Mass Spectrometry

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RationaleThe deep geological repository is considered the international reference for radioactive waste management. All gas exchanges must be understood in the context of the feasibility of such a repository. The technological challenge is to continuously monitor a wide range of gaseous molecules at low concentrations in confined spaces.MethodsA gas monitoring station, composed of two complementary analyzers, was developed: an electron impact quadrupole mass spectrometer (HPR‐20 R&D Hiden Analytical) and an infrared laser spectroscope (Picarro). The spectrometer was calibrated using simple mixtures (i.e., C2H6 in N2) and multiple mixtures (i.e., H2, He, CO2, CH4, and O2 in N2) at different concentrations to correct interferences. A matrix calculation is proposed to calculate the relative concentrations.ResultsThe method developed allows the measurement of gaseous species: light hydrocarbons, noble gases, sulfides, greenhouse gases, oxygen, hydrogen, and nitrogen in the same mixture. For each gas, the SDs and the limits of detection and quantification were calculated. The method was validated by comparing the concentrations of the measured gas species with the reference values of two standard gas cylinders.ConclusionsCalibration of a complex gas mixture remains a challenge because fragmentation of molecules, especially hydrocarbons, reduces the sensitivity of the method. The method developed is suitable for continuous gas monitoring in a confined environment and can be implemented to perform experiments in underground structures: galleries, microtunnels (cells), and boreholes.

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Experimental and Kinetic Study of the Direct Synthesis of Hydrogen Peroxide from Hydrogen and Oxygen over Palladium Catalysts

Cheng

Lippi

Yang

et al. 2019

Ind. Eng. Chem. Res.

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The catalyzed direct synthesis of hydrogen peroxide (H2O2) from hydrogen and oxygen has the potential to become a lower cost and more environmentally friendly alternative to the commercially practiced anthraquinone process. However, to date safety, selectivity, and product stability challenges have prevented the commercialization of this process. The development of a commercial process will benefit from a detailed understanding of mechanism and kinetics of this challenging reaction. In this study, kinetic modeling and experiments of direct synthesis of hydrogen peroxide were carried out on Pd/Al2O3, PdAu/Al2O3, and halide modified Pd/Al2O3(X) (X = F, Cl, Br) catalysts at atmospheric pressure and at 275 K; the hydrogen and oxygen concentrations in the gas phase were measured and quantified by online mass spectrometry. Kinetic expressions for all relevant elementary reactions were proposed. The kinetic coefficients were optimized by simulating the hydrogen and oxygen consumption rates with time on stream, and the kinetics were then discussed by considering all these reactions simultaneously. Based on these results, the effects of gold and halide anions were quantified. Among all tested palladium catalysts, the Pd/Al2O3(Br) catalyst displayed the best performance due to the positive effect of the Br– anion which inhibited hydrogen peroxide decomposition and direct water synthesis. The kinetic study also predicted hydrogen peroxide and water productivity during the reaction, in agreement with experimental observations.

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A method for the quantitative analysis of gaseous mixtures by online mass spectrometry

Cited by 8 publications

References 16 publications

Algorithm for the interpretation of mass spectra in the study of thermochemical conversion of lignocellulosic raw materials using complex combined thermal analysis

Algorithm for the interpretation of mass spectra in the study of thermochemical conversion of lignocellulosic raw materials using complex combined thermal analysis

Experimental and Kinetic Study of the Direct Synthesis of Hydrogen Peroxide from Hydrogen and Oxygen over Palladium Catalysts

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A method for the quantitative analysis of gaseous mixtures by online mass spectrometry

Cited by 8 publications

References 16 publications

Algorithm for the interpretation of mass spectra in the study of thermochemical conversion of lignocellulosic raw materials using complex combined thermal analysis

Algorithm for the interpretation of mass spectra in the study of thermochemical conversion of lignocellulosic raw materials using complex combined thermal analysis

Development of quantitative detection method for mass spectrometry coupled to an infrared laser spectroscope (Picarro) to monitor in nitrogen matrix a complex gas mixture of H2, He, CO, N2, Ne, O2, Ar, CO2, H2S, CH4, C2H4, C2H6, C3H6, C3H8, i‐C4H10, n‐C4H10, and C5H12

Experimental and Kinetic Study of the Direct Synthesis of Hydrogen Peroxide from Hydrogen and Oxygen over Palladium Catalysts

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