Exploration and development of large gas fields is an important way for a country to rapidly develop its natural gas industry.From 1991 to 2020,China discovered 68 new large gas fields,boosting its annual gas output t...Exploration and development of large gas fields is an important way for a country to rapidly develop its natural gas industry.From 1991 to 2020,China discovered 68 new large gas fields,boosting its annual gas output to 1925×108m3in 2020,making it the fourth largest gas-producing country in the world.Based on 1696 molecular components and carbon isotopic composition data of alkane gas in 70 large gas fields in China,the characteristics of carbon isotopic composition of alkane gas in large gas fields in China were obtained.The lightest and average values ofδ^(13)C_(1),δ13C2,δ13C3andδ13C4become heavier with increasing carbon number,while the heaviest values ofδ^(13)C_(1),δ13C2,δ13C3andδ13C4become lighter with increasing carbon number.Theδ^(13)C_(1)values of large gas fields in China range from-71.2‰to-11.4‰(specifically,from-71.2‰to-56.4‰for bacterial gas,from-54.4‰to-21.6‰for oil-related gas,from-49.3‰to-18.9‰for coal-derived gas,and from-35.6‰to-11.4‰for abiogenic gas).Based on these data,theδ^(13)C_(1)chart of large gas fields in China was plotted.Moreover,theδ^(13)C_(1)values of natural gas in China range from-107.1‰to-8.9‰,specifically,from-1071%o to-55.1‰for bacterial gas,from-54.4‰to-21.6‰for oil-related gas,from-49.3‰to-13.3‰for coal-derived gas,and from-36.2‰to-8.9‰for abiogenic gas.Based on these data,theδ^(13)C_(1)chart of natural gas in China was plotted.展开更多
Ultra-long n-alkanes are highly valuable in both scientific research and as major constituents of specialty high-melting-point waxes.Unlike conventional methods(e.g.,Fischer–Tropsch(FT),ethylene oligomerization,and p...Ultra-long n-alkanes are highly valuable in both scientific research and as major constituents of specialty high-melting-point waxes.Unlike conventional methods(e.g.,Fischer–Tropsch(FT),ethylene oligomerization,and polyethylene cracking)typically resulting in wide n-alkane distributions,the elaborate design strategy presented herein allows the direct synthesis of pure,long n-alkanes using a modular splicing method with acetone,furfural,and fatty acid anhydrides or acyl chlorides as bio-blocks.The herein approach is based on a simple four-step catalytic reaction scheme involving C–C chain elongation and C–O bond activation.The synthesized pure n-alkanes had a carbon chain length as high as C_(49)(total yield of 49%).The synthesis approach also allows to selectively prepare n-alkanes with even and odd carbon numbers ranging from C15 to C_(49).This process represents a great breakthrough in the synthesis of long-chain pure n-alkanes,surpassing the carbon number limitations reported in previous methodologies.展开更多
Individual hydrocarbons identified to be macrocyclic alkanes in a torbanite from the Sydney Basin(Australia)were successfully isolated from its extracts using preparative gas chromatography and analyzed by NMR.Saturat...Individual hydrocarbons identified to be macrocyclic alkanes in a torbanite from the Sydney Basin(Australia)were successfully isolated from its extracts using preparative gas chromatography and analyzed by NMR.Saturated cyclic structures were confirmed by single peaks in the NMR~1H and~(13)C spectra indicating single forms of H and C atoms exist in these biomarker molecules.This is consistent with the methylene unit in a ring system assignment of the macrocyclic alkanes and accounts for a formula of(CH2)n.The unusual molecular structures of these compounds are consistent with those that were identified from previous GC retention index data and co-injection with a standard supports the previous research.The mass spectral fragmentation behaviors of representative cyclic alkanes were further investigated by comparing them with the mass spectra of isolated individual macrocyclic alkanes.The characteristic fragment ions in the macrocyclic alkanes of(M–28)+and base peaks of m/z 97,111,125,etc.,can be assigned as being generated by simple a-/i-cleavage and hydrogen rearrangement.These fragmentation pathways combined with retention indices should assist in differentiating these compounds from monounsaturated alkenes and alkylated monocyclics having similar mass spectral characteristics in other geological samples.展开更多
Zinc-modified Pt/SAPO-11 catalysts were prepared by incipient wetness impregnation and assessed in the hydroisomerization of n-octane.Their physicochemical properties were investigated using powder X-ray diffraction,s...Zinc-modified Pt/SAPO-11 catalysts were prepared by incipient wetness impregnation and assessed in the hydroisomerization of n-octane.Their physicochemical properties were investigated using powder X-ray diffraction,scanning electron microscopy,nitrogen adsorption-desorption,pyridine-adsorbed infrared spectroscopy,temperature-programmed desorption of NH3,temperature-programmed reduction of hydrogen,temperature-programmed desorption of hydrogen,transmission electron microscopy,and X-ray photoelectron spectroscopy.The addition of zinc resulted in high dispersion of platinum.Zinc acted as a competitive adsorbent,changed the location of platinum.The catalyst with a zinc loading of 0.5%gave the highest selectivity to dimethylhexanes,but the conversion was lower than those achieved with the other catalysts.Dimethylhexanes have large molecular diameters,and therefore their diffusion may be difficult.This weakens the catalytic activity of the zinc-modified catalysts and lowers the n-octane conversion.展开更多
目的:分析国际标准化组织(international organization for standardization,ISO)针灸国际标准建设的概况与特点,为进一步推进针灸国际标准化建设提供依据,以促进针灸疗法的推广、应用与国际交流。方法:对ISO官网中针灸相关标准进行检索...目的:分析国际标准化组织(international organization for standardization,ISO)针灸国际标准建设的概况与特点,为进一步推进针灸国际标准化建设提供依据,以促进针灸疗法的推广、应用与国际交流。方法:对ISO官网中针灸相关标准进行检索,并分析其特点。结果:目前ISO已发布的针灸相关标准共19项,包括器具标准13项、术语标准5项、安全标准1项;正在研制中的针灸相关标准共6项,包括器具标准3项、术语标准1项、安全标准2项。结论:ISO针灸国际标准制定快速增长,涉及的领域逐步扩大;ISO针灸相关标准以器具标准为主,安全标准仅涉及器具安全;ISO针灸相关国际标准的推广和应用有待提高。展开更多
ISO 15489-1的基本介绍I SO 15489-1由国际标准化组织信息与文献标准化技术委员会档案(文件)管理分技术委员会(以下简称“ISO TC46/S C11”)最早发布于2001年,是全球第一个关于文件管理的国际标准,综合了世界各国文件管理的先进经验,吸...ISO 15489-1的基本介绍I SO 15489-1由国际标准化组织信息与文献标准化技术委员会档案(文件)管理分技术委员会(以下简称“ISO TC46/S C11”)最早发布于2001年,是全球第一个关于文件管理的国际标准,综合了世界各国文件管理的先进经验,吸收了国际公认的最优化文件管理方法,具有较强的先进性、前瞻性和实用性。该标准是ISOT C46/SC11所制定系列标准的基础标准,现已被全球50多个国家采用,并先后被翻译超过22余种语言。经过10余年的应用、持续研究与改进、审核与咨询,2016年,ISO发布了15489-1:2001的修订版。展开更多
2021年8月27日,国际标准化组织(ISO)和国际电工委员会(IEC)正式发布ISO/IEC 20830:2021《信息技术自动识别与数据采集技术汉信码条码符号规范》(Information technology-Automatic identification and data capture techniques-HanXin C...2021年8月27日,国际标准化组织(ISO)和国际电工委员会(IEC)正式发布ISO/IEC 20830:2021《信息技术自动识别与数据采集技术汉信码条码符号规范》(Information technology-Automatic identification and data capture techniques-HanXin Code bar code symbology specification)。为帮助我国条码与自动识别技术产业界深入理解该标准中Unicode模式的技术实现方法,解决应用该模式进行信息编码的问题,本文详细介绍了汉信码Unicode模式的设计思路与编解码技术方案,并给出了编码实例进行解释和说明。展开更多
Mitigation of the deleterious environmental impacts associated with CO_(2) emissions requires the development of more sustainable processes for synthesizing fuels and chemicals.Selective conversion of abundant yet dif...Mitigation of the deleterious environmental impacts associated with CO_(2) emissions requires the development of more sustainable processes for synthesizing fuels and chemicals.Selective conversion of abundant yet difficult to activate molecules such as CO_(2) and surplus light alkanes from shale gas to desirable products can potentially reduce reliance upon conventional fossil-based feedstocks.Therefore,co-conversion of CO_(2) with abundant light alkanes such as methane and ethane using atmospheric-pressure.展开更多
This paper presents a review of low molecular weight alkane-fed solid oxide fuel cells(SOFCs),which,unlikely the conventional use of SOFCs for only power production,are utilized to cogenerate produce useful chemicals ...This paper presents a review of low molecular weight alkane-fed solid oxide fuel cells(SOFCs),which,unlikely the conventional use of SOFCs for only power production,are utilized to cogenerate produce useful chemicals at the same time.The cogeneration processes in SOFC have been classified according to the different types of fuel.C_(2)and C_(3)alkenes and synthesis gas are the main cogenerated chemicals together with electricity.The chemicals and energy cogeneration in a fuel cell reactor seems to be an effective alternative to conventional reactors for only chemicals production and conventional fuel cells for only power production.Although,the use of SOFCs for chemicals and energy cogeneration has proved successful in the industrial setting,the development of new catalysts aimed at obtaining the desired chemicals together with the production of a high amount of energy,and optimizing SOFC operation conditions is still a challenge to enhance system performance and make commercial applications workable.展开更多
基金Supported by the National Natural Science Foundation of China(41472120)General Project of National Natural Science Foundation of China(42272188)+1 种基金Special Fund of PetroChina and New Energy Branch(2023YQX10101)Petrochemical Joint Fund of Fund Committee(U20B6001)。
文摘Exploration and development of large gas fields is an important way for a country to rapidly develop its natural gas industry.From 1991 to 2020,China discovered 68 new large gas fields,boosting its annual gas output to 1925×108m3in 2020,making it the fourth largest gas-producing country in the world.Based on 1696 molecular components and carbon isotopic composition data of alkane gas in 70 large gas fields in China,the characteristics of carbon isotopic composition of alkane gas in large gas fields in China were obtained.The lightest and average values ofδ^(13)C_(1),δ13C2,δ13C3andδ13C4become heavier with increasing carbon number,while the heaviest values ofδ^(13)C_(1),δ13C2,δ13C3andδ13C4become lighter with increasing carbon number.Theδ^(13)C_(1)values of large gas fields in China range from-71.2‰to-11.4‰(specifically,from-71.2‰to-56.4‰for bacterial gas,from-54.4‰to-21.6‰for oil-related gas,from-49.3‰to-18.9‰for coal-derived gas,and from-35.6‰to-11.4‰for abiogenic gas).Based on these data,theδ^(13)C_(1)chart of large gas fields in China was plotted.Moreover,theδ^(13)C_(1)values of natural gas in China range from-107.1‰to-8.9‰,specifically,from-1071%o to-55.1‰for bacterial gas,from-54.4‰to-21.6‰for oil-related gas,from-49.3‰to-13.3‰for coal-derived gas,and from-36.2‰to-8.9‰for abiogenic gas.Based on these data,theδ^(13)C_(1)chart of natural gas in China was plotted.
基金supported by National Natural Science Foundation of China(General Program,No.22372060)Shanghai Municipal Science and Technology Commission Project(No.22dz1209300)National Natural Science Youth Fund(No.22205065)。
文摘Ultra-long n-alkanes are highly valuable in both scientific research and as major constituents of specialty high-melting-point waxes.Unlike conventional methods(e.g.,Fischer–Tropsch(FT),ethylene oligomerization,and polyethylene cracking)typically resulting in wide n-alkane distributions,the elaborate design strategy presented herein allows the direct synthesis of pure,long n-alkanes using a modular splicing method with acetone,furfural,and fatty acid anhydrides or acyl chlorides as bio-blocks.The herein approach is based on a simple four-step catalytic reaction scheme involving C–C chain elongation and C–O bond activation.The synthesized pure n-alkanes had a carbon chain length as high as C_(49)(total yield of 49%).The synthesis approach also allows to selectively prepare n-alkanes with even and odd carbon numbers ranging from C15 to C_(49).This process represents a great breakthrough in the synthesis of long-chain pure n-alkanes,surpassing the carbon number limitations reported in previous methodologies.
基金the financial support from The Strategic Priority Research Program of the Chinese Academy of Sciences(XDA14010102)Chinese National Science Foundation grants(4197306941673045)。
文摘Individual hydrocarbons identified to be macrocyclic alkanes in a torbanite from the Sydney Basin(Australia)were successfully isolated from its extracts using preparative gas chromatography and analyzed by NMR.Saturated cyclic structures were confirmed by single peaks in the NMR~1H and~(13)C spectra indicating single forms of H and C atoms exist in these biomarker molecules.This is consistent with the methylene unit in a ring system assignment of the macrocyclic alkanes and accounts for a formula of(CH2)n.The unusual molecular structures of these compounds are consistent with those that were identified from previous GC retention index data and co-injection with a standard supports the previous research.The mass spectral fragmentation behaviors of representative cyclic alkanes were further investigated by comparing them with the mass spectra of isolated individual macrocyclic alkanes.The characteristic fragment ions in the macrocyclic alkanes of(M–28)+and base peaks of m/z 97,111,125,etc.,can be assigned as being generated by simple a-/i-cleavage and hydrogen rearrangement.These fragmentation pathways combined with retention indices should assist in differentiating these compounds from monounsaturated alkenes and alkylated monocyclics having similar mass spectral characteristics in other geological samples.
基金supported by the National Natural Science Foundation of China(21676300)~~
文摘Zinc-modified Pt/SAPO-11 catalysts were prepared by incipient wetness impregnation and assessed in the hydroisomerization of n-octane.Their physicochemical properties were investigated using powder X-ray diffraction,scanning electron microscopy,nitrogen adsorption-desorption,pyridine-adsorbed infrared spectroscopy,temperature-programmed desorption of NH3,temperature-programmed reduction of hydrogen,temperature-programmed desorption of hydrogen,transmission electron microscopy,and X-ray photoelectron spectroscopy.The addition of zinc resulted in high dispersion of platinum.Zinc acted as a competitive adsorbent,changed the location of platinum.The catalyst with a zinc loading of 0.5%gave the highest selectivity to dimethylhexanes,but the conversion was lower than those achieved with the other catalysts.Dimethylhexanes have large molecular diameters,and therefore their diffusion may be difficult.This weakens the catalytic activity of the zinc-modified catalysts and lowers the n-octane conversion.
文摘目的:分析国际标准化组织(international organization for standardization,ISO)针灸国际标准建设的概况与特点,为进一步推进针灸国际标准化建设提供依据,以促进针灸疗法的推广、应用与国际交流。方法:对ISO官网中针灸相关标准进行检索,并分析其特点。结果:目前ISO已发布的针灸相关标准共19项,包括器具标准13项、术语标准5项、安全标准1项;正在研制中的针灸相关标准共6项,包括器具标准3项、术语标准1项、安全标准2项。结论:ISO针灸国际标准制定快速增长,涉及的领域逐步扩大;ISO针灸相关标准以器具标准为主,安全标准仅涉及器具安全;ISO针灸相关国际标准的推广和应用有待提高。
文摘2021年8月27日,国际标准化组织(ISO)和国际电工委员会(IEC)正式发布ISO/IEC 20830:2021《信息技术自动识别与数据采集技术汉信码条码符号规范》(Information technology-Automatic identification and data capture techniques-HanXin Code bar code symbology specification)。为帮助我国条码与自动识别技术产业界深入理解该标准中Unicode模式的技术实现方法,解决应用该模式进行信息编码的问题,本文详细介绍了汉信码Unicode模式的设计思路与编解码技术方案,并给出了编码实例进行解释和说明。
基金financially supported by the Yale Center for Natural Carbon Capturesupport from the U.S. Department of Energy, Office of Basic Energy Sciences, under Contract No. DE-SC0012704。
文摘Mitigation of the deleterious environmental impacts associated with CO_(2) emissions requires the development of more sustainable processes for synthesizing fuels and chemicals.Selective conversion of abundant yet difficult to activate molecules such as CO_(2) and surplus light alkanes from shale gas to desirable products can potentially reduce reliance upon conventional fossil-based feedstocks.Therefore,co-conversion of CO_(2) with abundant light alkanes such as methane and ethane using atmospheric-pressure.
文摘This paper presents a review of low molecular weight alkane-fed solid oxide fuel cells(SOFCs),which,unlikely the conventional use of SOFCs for only power production,are utilized to cogenerate produce useful chemicals at the same time.The cogeneration processes in SOFC have been classified according to the different types of fuel.C_(2)and C_(3)alkenes and synthesis gas are the main cogenerated chemicals together with electricity.The chemicals and energy cogeneration in a fuel cell reactor seems to be an effective alternative to conventional reactors for only chemicals production and conventional fuel cells for only power production.Although,the use of SOFCs for chemicals and energy cogeneration has proved successful in the industrial setting,the development of new catalysts aimed at obtaining the desired chemicals together with the production of a high amount of energy,and optimizing SOFC operation conditions is still a challenge to enhance system performance and make commercial applications workable.
