Article
Spectroscopy
Aleksandr S. Tanichev, Dmitry Petrov
Summary: This study investigates the mutual influence of CH4-N2, CH4-CO2, and CH4-C2H6 on their characteristic Raman bands. The half-width and asymmetry of the Q branches of N2, CO2, and C2H6 as a function of methane concentration were measured. Results obtained from a high-sensitivity spectrometer with a resolution of 0.5 cm^-1 based on spontaneous Raman scattering provided reliable data. An algorithm and the necessary parameters for simulating the effect of various molecular environments on the Raman bands of the main components of natural gas are presented.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2023)
Article
Chemistry, Analytical
Dmitry V. Petrov, Ivan I. Matrosov, Alexey R. Zaripov, Aleksandr S. Tanichev
Summary: This paper discusses the application of Raman spectroscopy in analyzing natural gas. The experimental results show that Raman gas analyzers can accurately measure samples with varying concentrations without frequent calibrations. Additionally, the study found that changes in gas composition can affect the spectral lines of methane, resulting in measurement errors in oxygen concentration.
Article
Environmental Sciences
Hui Li, Xuekang Lu, Lin Wang, Wenjing Wang, Tianhua Li, Wanjun Lu, Yong Chen
Summary: Most experiments indicate that gas hydrates are enriched in C2+ gases compared to the feeding gas source, due to fractionation during the crystallization process. However, sediments below the gas hydrate stability zone (BGHSZ) are relatively enriched in C2+ hydrocarbon gases compared to the hydrate-occurring zone above. The mechanisms causing these variations are still unclear. To investigate these mechanisms, a series of pore-scale experimental observations were conducted, simulating the dissolution-migration-hydration processes.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Multidisciplinary Sciences
Itziar Irakulis-Loitxate, Luis Guanter, Yin-Nian Liu, Daniel J. Varon, Joannes D. Maasakkers, Yuzhong Zhang, Apisada Chulakadabba, Steven C. Wofsy, Andrew K. Thorpe, Riley M. Duren, Christian Frankenberg, David R. Lyon, Benjamin Hmiel, Daniel H. Cusworth, Yongguang Zhang, Karl Segl, Javier Gorrono, Elena Sanchez-Garcia, Melissa P. Sulprizio, Kaiqin Cao, Haijian Zhu, Jian Liang, Xun Li, Ilse Aben, Daniel J. Jacob
Summary: The study revealed a significant number of extreme point sources in the Permian basin, contributing to a large portion of methane emissions. New facilities and inefficient flaring operations were identified as major contributors. These findings question current practices and are crucial for guiding emission reduction efforts.
Article
Chemistry, Physical
Asheesh Kumar, Hari Prakash Veluswamy, Sanat Kumar, Rajnish Kumar, Praveen Linga
Summary: Clathrate hydrate-based sustainable technologies, such as solidified natural gas (SNG) technology, show great potential for storing natural gas. Experiments on mixed hydrates in a seawater environment reveal the promotional effect of seawater on hydrate formation and suggest the economic feasibility of using natural seawater to enhance SNG technology.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Multidisciplinary Sciences
Maryann R. Sargent, Cody Floerchinger, Kathryn McKain, John Budney, Elaine W. Gottlieb, Lucy R. Hutyra, Joseph Rudek, Steven C. Wofsy
Summary: The top-down study on methane emissions from natural gas in the Boston urban region over 8 years showed no significant trend in the loss rate, with consumption-driven losses potentially accounting for missing emissions in inventories. Comparisons with estimates from six US cities suggest that distribution and end use losses from natural gas supply chain may contribute significantly to total emissions, indicating a need for future policy action.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Energy & Fuels
James Titchener, Doug Millington-Smith, Chris Goldsack, George Harrison, Alexander Dunning, Xiao Ai, Murray Reed
Summary: The text discusses the development of a novel remote gas imaging sensor for the detection, visualization, and quantification of methane emissions. This sensor utilizes a new technique called Tunable Diode Lidar (TDLidar) to achieve remote spectroscopy and ranging with low power semiconductor diode lasers. The sensor's ability to quantify leak rates as low as 0.012 g/s, detect at distances over 90 m, and potentially be applied for widespread continuous and autonomous monitoring of industrial methane emissions makes it a promising technology for climate change mitigation.
Article
Optics
D. Petrov, I. I. Matrosov, M. A. Kostenko
Summary: An improved gas analyzer based on Raman spectroscopy is introduced, which can measure the content of various molecular species in the atmosphere. By optimizing the optical system and compressing the gas sample, high signal-to-noise ratio measurements are achieved. A contour fit method is used to accurately derive the concentrations from Raman spectra. The measurement results show good agreement with a high-sensitive CRDS gas analyzer.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Environmental Sciences
Xiangang Xu, Xinyue Zhong, Jiankai Dong, Donglai Xie, Wanlu Lu
Summary: Methane is a significant greenhouse gas and its emissions from the natural gas sector are often underestimated. This study used a mass balance approach to quantify methane emissions during the installation of natural gas meters and found a fat tail distribution in the emissions. The total methane emissions in China were substantial, with the highest emissions concentrated in the southeast. This research fills a gap in measuring methane emissions across the natural gas chain in China and provides data to support reduction targets and technologies.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Engineering, Environmental
Ariana L. Tribby, Justin S. Bois, Stephen A. Montzka, Elliot L. Atlas, Isaac Vimont, Xin Lan, Pieter P. Tans, James W. Elkins, Donald R. Blake, Paul O. Wennberg
Summary: We analyzed global airborne observations to estimate emissions from oil and gas operations. By updating the emissions configuration in a chemical transport model, we were able to simulate the global distribution of propane and ethane and compare it with observed data. We found that emissions in oil-producing basins are dominated by pre-processing activities.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Marine
Kati Lehtoranta, Paivi Koponen, Hannu Vesala, Kauko Kallinen, Teuvo Maunula
Summary: The study shows that using methane oxidation catalyst (MOC) can effectively reduce methane slip emissions in LNG ships. The use of a special sulfur trap can protect MOC against sulfur poisoning to some extent, and regeneration done once a day can recover the efficiency of MOC.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
Article
Thermodynamics
Jackson Crane, Xian Shi, Rui Xu, Hai Wang
Summary: The study found that natural gas has significantly smaller detonation induction length and lower detonation pressure limit compared to high purity methane, suggesting a wider operating range when used as a fuel in detonation-based engines. Additionally, the variability in detonation and combustion behaviors between natural gases and commercial methane is expected to be similar, highlighting the importance of using natural gas in safety-related studies instead of neat methane.
COMBUSTION AND FLAME
(2022)
Article
Biotechnology & Applied Microbiology
Akanksha Singh Rajput, Taraknath Das
Summary: A series of Ni1-xCex catalysts were prepared by the sol-gel technique and tested for the dry reforming of methane. The addition of ceria to nickel improved the conversion of CH4 and CO2. The calcined catalyst 40Ni(0.75)Ce(0.25)/Al2O3 at 700°C showed high CO2 and CH4 conversion. The reduced catalyst exhibited better catalytic activity but suffered from coke deposition.
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
(2023)
Article
Engineering, Multidisciplinary
D. V. Petrov, I. I. Matrosov, A. R. Zaripov, A. S. Tanichev, M. A. Kostenko, A. O. Nekhoroshev
Summary: The study found that Raman gas analyzers provide high measurement accuracy for low molar fraction components, and even surpass the accuracy of gas chromatographs for high molar fraction components.
MEASUREMENT TECHNIQUES
(2021)
Article
Environmental Sciences
Diana B. Loomer, Kerry T. B. MacQuarrie, Tom A. Al
Summary: Reactive transport modeling was used to study the influence of gas solubility, sorption, and diffusive transport on dissolved methane, ethane, propane concentrations, and isotopic composition in groundwater. Diffusive isotopic fractionation had a significant impact on delta C-13(1) values, resulting in extremely depleted values. The modeling also showed that the diffusive fractionation of delta C-13(1) is offset by other processes like microbial oxidation.
WATER RESOURCES RESEARCH
(2021)
Article
Instruments & Instrumentation
Dmitry V. Petrov
Summary: This paper discusses a technique for deriving carbon monoxide intensity in Raman spectra by fitting nitrogen spectrum at various temperatures. It is found that ignoring the Herman-Wallis factors in the fitting procedure leads to an additional measurement error, especially at high temperatures.
APPLIED SPECTROSCOPY
(2021)
Article
Thermodynamics
Anatoly Maznoy, Nikita Pichugin, Igor Yakovlev, Roman Fursenko, Dmitry Petrov, Shenqyang (Steven) Shy
Summary: The trend toward transitioning to renewable energy highlights the need for fuel-flexible burners, with a new annular cylindrical burner showing high radiation efficiency and the ability to reduce CO and NOX emissions in a stable radiant mode.
APPLIED THERMAL ENGINEERING
(2021)
Article
Physics, Multidisciplinary
D. V. Petrov, I. I. Matrosov, A. R. Zaripov, A. S. Tanichev
RUSSIAN PHYSICS JOURNAL
(2021)
Article
Engineering, Electrical & Electronic
D. Petrov, I. I. Matrosov, M. A. Kostenko
Summary: A Raman spectrometer with a detection limit of 100 ppb for gaseous media was developed, and experimental results on exhaled air samples from healthy individuals confirmed the feasibility of monitoring concentrations of various hydrocarbon compounds and (CO2)-C-13. Further development of this analytical method was outlined.
QUANTUM ELECTRONICS
(2021)
Article
Spectroscopy
Aleksandr S. Tanichev, Dmitry V. Petrov
Summary: The study developed and verified two methods for simulating the nu(2) Raman band of methane at different spectral resolutions and pressures, showing that the differences between calculated and measured spectra did not exceed 5% for each method in the range of 1-60 atm.
JOURNAL OF RAMAN SPECTROSCOPY
(2022)
Article
Engineering, Multidisciplinary
D. V. Petrov, I. I. Matrosov, A. R. Zaripov, A. S. Tanichev, M. A. Kostenko, A. O. Nekhoroshev
Summary: The study found that Raman gas analyzers provide high measurement accuracy for low molar fraction components, and even surpass the accuracy of gas chromatographs for high molar fraction components.
MEASUREMENT TECHNIQUES
(2021)
Editorial Material
Chemistry, Analytical
Dmitry Petrov
ANALYTICAL CHEMISTRY
(2021)
Article
Biochemistry & Molecular Biology
Aleksandr S. Tanichev, Dmitry V. Petrov
Summary: This study investigates the effect of nitrogen and carbon dioxide on the depolarization ratio of the nu(1) band of methane. The results indicate that the influence of nitrogen and carbon dioxide on this parameter is negligible within the specified pressure range. These findings are important for improving the accuracy of gas analysis methods using Raman spectroscopy.
Article
Optics
D. Petrov, I. I. Matrosov, M. A. Kostenko
Summary: An improved gas analyzer based on Raman spectroscopy is introduced, which can measure the content of various molecular species in the atmosphere. By optimizing the optical system and compressing the gas sample, high signal-to-noise ratio measurements are achieved. A contour fit method is used to accurately derive the concentrations from Raman spectra. The measurement results show good agreement with a high-sensitive CRDS gas analyzer.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Optics
D. V. Petrov, I. I. Matrosov, A. S. Tanichev, M. A. Kostenko, A. R. Zaripov
Summary: This paper describes gas analyzers based on Raman spectroscopy designed at the Institute of Monitoring of Climatic and Ecological Systems, Siberian Branch, Russian Academy of Sciences. It shows the capabilities and advantages of these analyzers in measuring the composition of fuel gases and atmospheric and exhaled air. The paper also discusses the features of the analyzer operation and techniques for increasing measurement accuracy.
ATMOSPHERIC AND OCEANIC OPTICS
(2022)
Article
Chemistry, Analytical
Dmitry Petrov, Ivan Matrosov
Summary: In this study, a technique for natural gas analysis based on polarized Raman spectroscopy is presented. By using only the isotropic components of spectra, the procedure for extracting concentrations is simplified and the measurement accuracy is improved for components with spectral overlap. This technique is of great importance in the analysis of multicomponent gas mixtures and the measurement of isotopic composition.
ANALYTICAL CHEMISTRY
(2023)
Article
Spectroscopy
Aleksandr S. Tanichev, Dmitry V. Petrov, Matvey A. Kostenko
Summary: Raman spectroscopy is a promising method for analyzing natural gas and measuring hydrocarbon concentrations. This paper presents a simple method to simulate the Raman spectrum of methane in natural gas under different pressures and concentrations of nitrogen, carbon dioxide, and ethane. The method can improve the accuracy of Raman gas analysis of natural gas and other methane-bearing media.
JOURNAL OF RAMAN SPECTROSCOPY
(2023)
Article
Chemistry, Analytical
Dmitry V. Petrov, Ivan I. Matrosov, Alexey R. Zaripov, Aleksandr S. Tanichev
Summary: This paper discusses the application of Raman spectroscopy in analyzing natural gas. The experimental results show that Raman gas analyzers can accurately measure samples with varying concentrations without frequent calibrations. Additionally, the study found that changes in gas composition can affect the spectral lines of methane, resulting in measurement errors in oxygen concentration.
Proceedings Paper
Meteorology & Atmospheric Sciences
D. Petrov, A. S. Tanichev
Summary: The study aimed to measure the depolarization ratio of the nu(1) Raman band of methane in nitrogen and carbon dioxide media at 50 atm pressure, finding that the environment had a negligible effect on the depolarization ratio.
27TH INTERNATIONAL SYMPOSIUM ON ATMOSPHERIC AND OCEAN OPTICS, ATMOSPHERIC PHYSICS
(2021)
Article
Optics
A. S. Tanichev, D. Petrov, I. I. Matrosov, K. K. Sharybkina
Summary: The study measured the spectral parameters of methane in different pressures and concentrations, and developed an empirical model for estimating the concentration of helium in a mixture, with an error of less than 1%. Paths for improvement of the technique and enhancement of its accuracy are considered.
ATMOSPHERIC AND OCEANIC OPTICS
(2021)
Article
Spectroscopy
Zh. E. Ozbekova, A. A. Abdyldaev, A. A. Kulmyrzaev
Summary: This study compared two drying methods for cow and yak muscles, finding that freeze drying caused less discoloration. Additionally, analysis of fluorescence spectra allowed for accurate prediction of chemical composition and color characteristics of the muscles.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)
Article
Spectroscopy
Leo Mandic, Ivan Ljubic, Iva Dzeba
Summary: In this study, a combined experimental and computational approach was used to investigate the photoexcitation and photodegradation mechanisms of Doxazosin (DOX). The results provide valuable insights into the primary events following the photoexcitation of DOX and its potential applications.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)
Article
Spectroscopy
Xiufeng Wang, Yao Jin, Wenhui Ai, Siqi Wang, Zhiqing Zhang, Ting Zhou, Fang Wang, Guodong Zhang
Summary: This study successfully synthesized near infrared fluorescence Ag2S quantum dots (QDs) and developed a dual-mode sensor for sulfide anion using the excellent oxidase-like characteristics of manganese dioxide (MnO2) nanosheets. The sensor showed a wider detection range, higher sensitivity, and shorter reaction time, making it suitable for highly selective detection of sulfide in different concentration ranges.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)
Article
Spectroscopy
Yafei Li, Yanming Ma, Chuantao Zheng, Di Yu, Lien Hu, Shuo Yang, Fang Song, Yadan Li, Shuanghai Liu, Zhanrui Zhang, Yu Zhang, Yiding Wang, Frank K. Tittel
Summary: To effectively monitor gas explosion and coal spontaneous combustion in coal mine, an intrinsically safe and explosion-proof dual-gas sensor system was developed for methane (CH4) and carbon monoxide (CO) measurement. The system achieved different measurement ranges using laser scanning and gas cells, and improved stability and accuracy through gas pre-treatment and temperature compensation algorithm.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)
Article
Spectroscopy
Pei-Rong Chen, Li-Kang Chu
Summary: In this study, the hydrates of glyoxal were investigated using infrared absorption spectrometry. The results showed that at low concentrations, glyoxal mainly exists as monomeric dihydrate. These findings provide suitable detection windows for further research on the roles of glyoxal and its hydrates in atmospheric and aerosol chemistry, as well as the relevant reaction kinetics.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)
Article
Spectroscopy
Nichole O'Neill, Thamires A. Lima, Fabio Furlan Ferreira, Nicolas J. Alvarez, Reinhard Schweitzer-Stenner
Summary: This study determines the main fibril axis of GHG gel-forming fibrils using various techniques and compares the results with simulated data. The analysis suggests that the hydrophobic xz-surfaces of GHG fibrils could be a good target for the adsorption of hydrophobic drugs.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)
Article
Spectroscopy
Mengyuan Liu, Hanchuang Zhu, Yikun Fang, Caiyun Liu, Xinke Li, Xiaohui Zhang, Lixue Ma, Kun Wang, Miaohui Yu, Wenlong Sheng, Baocun Zhu
Summary: ABHS is an efficient fluorescent probe that can accurately and sensitively detect Al3+ with strong resistance to interference. It also demonstrates excellent detection and imaging capabilities in complex real samples.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)
Article
Spectroscopy
Ahmed S. El-Shafie, Evana Rahman, Yasser Gadelhak, Rehab Mahmoud, Marwa El-Azary
Summary: The recycling of waste mandarin peels into biochar (MRBC) has been used as a high performance and cost-effective adsorbent for treating polluted wastewater effluents. Batch adsorption studies were conducted to analyze the adsorption competency of MRBC on two dyes, methylene blue (MB) and basic fuchsin (BF), either in individual solutions or binary combinations. The results showed that MRBC was capable of effectively removing a high percentage of both dyes. However, the adsorption capacity decreased when the dyes were combined. The cost estimation of MRBC production and wastewater treatment indicated that both were relatively low.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)
Article
Spectroscopy
Anindita Bhatta, Jahnabi Upadhyaya, Dipak Chamlagai, Lincoln Dkhar, Pynskhemborlang T. Phanrang, Mohan Rao Kollipara, Sivaprasad Mitra
Summary: Derivatives of thiazole-pyrazole fused benzo-coumarin compounds were synthesized and their photophysical properties were investigated. The synthesized coumarin compounds showed potential as therapeutic agents for Alzheimer's disease, inhibiting acetylcholinesterase activity. The presence of human serum albumin was found to affect the inhibition activity.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)
Article
Spectroscopy
Yongwei Duan, Quancheng Liu, Yiju Zhu, Qi Zhang, Xiaohui Duan, Hu Deng, Liping Shang
Summary: In this study, the phase transition of CL-20 was observed using terahertz spectroscopy, and quantum chemical calculations were employed to analyze the vibrations. The results indicated changes in the vibrations of CL-20 before and after phase transition.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)
Article
Spectroscopy
Yuefeng Gao, Sai Xu, Baojiu Chen
Summary: This study synthesized Cs2NaInCl6 nanocrystals co-doped with Sb3+ and Tb3+ ions as probes for copper ions detection in lubricating oil. The introduction of Sb3+ effectively reduced the band gap of the host material and enabled energy transfer pathway for Tb3+ emission. The doped Tb3+ ions resulted in the suppression of emission due to electron transfer. The Cs2NaInCl6: 2.5 %Sb3+, 40 %Tb3+ NCs exhibited superior sensitivity and selectivity for copper ions detection.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)
Article
Spectroscopy
Yu Liu, Yue Zhang, Changyao Liu, Ce Wang, Baocai Xu, Li Zhao
Summary: A highly sensitive detection platform for heparin was developed using a cationic fluorescent dye (cresyl violet acetate) as a fluorescence probe. The platform demonstrated high selectivity towards heparin and achieved detection in both HEPES solution and serum.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)
Article
Spectroscopy
Lopamudra Roy, Nivedita Pan, Susmita Mondal, Ria Ghosh, Md. Nur Hasan, Neha Bhattacharyya, Soumendra Singh, Kallol Bhattacharyya, Arpita Chattopadhyay, Samir Kumar Pal
Summary: The study focuses on the interaction between reactive oxygen species (ROS) and a spectroscopic probe called Rose Bengal (RB), encapsulated in nanoscopic sodium dodecyl sulphate (SDS) micelles and entrapped in microscopic nylon 66 solid matrix. The research demonstrates efficient interaction between ROS and RB-SDS, and investigates the mechanism of hydroxyl radicals generation. Based on these findings, a prototype device utilizing RB embedded in a nylon thin film for quantification of ROS in extracellular fluids and food materials was developed.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)
Article
Spectroscopy
Xiaosong Sun, Qihao Cui, Wenyue Dong, Qian Duan, Teng Fei
Summary: Conjugated porous polymers (CPPs) are promising sensing materials and their application in aqueous media is limited. In this study, we synthesized CPPs with porous structure and prepared nanoparticles, enabling efficient photoluminescence sensing of nitroaromatic explosives in aqueous phase.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)
Article
Spectroscopy
Maria Cristina Caggiani, Germana Barone, Paolo Mazzoleni
Summary: Raman spectroscopy is commonly used for studying glassy materials in cultural heritage, but it is more difficult to interpret the spectra and apply the technique with portable instruments. In contrast, diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) can be used in archaeometric investigations as it is portable and non-invasive. However, there is limited application of this technique to historical glasses. This exploratory work demonstrates the potential of DRIFTS, in combination with portable X-ray Fluorescence (pXRF) and EDS microanalyses, for studying the composition and alteration of glass samples in cultural heritage.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2024)