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1. Evaluation of the effect of adsorbed gas and free gas on mechanical properties of coal

Author:
Lu, Shouqing; Zhang, Yongliang; Sa, Zhanyou; Si, Shufang
Source:
Environmental earth sciences 2019 v.78 no.6 pp. 218
ISSN:
1866-6280
Subject:
coalbed methane; methane,   etc   ; coal; mechanical properties; models;     Show all 5 Subjects
Abstract:
... The mechanical properties of coal are important parameters for coalbed methane (CBM) extraction and gas outburst control. However, the effect of adsorbed gas on strength cannot be evaluated quantitatively yet. To better understand the weakening mechanisms of free and adsorbed gas on the strength of coal, normal coal, and deformed coal are chosen to test their mechanical properties of CH₄-saturated ...
DOI:
10.1007/s12665-019-8222-3

2. Effect of the volume of methane released into respiration chambers on full system methane recovery

Author:
Arceo-Castillo, Jeyder I.; Montoya-Flores, Maria D.; Molina-Botero, Isabel C.; Piñeiro-Vázquez, Angel T.; Aguilar-Pérez, Carlos F.; Ayala-Burgos, Armin J.; Solorio-Sánchez, Francisco J.; Castelán-Ortega, Octavio A.; Quintana-Owen, Patricia; Ku-Vera, Juan C.
Source:
Animal feed science and technology 2019
ISSN:
0377-8401
Subject:
methane; methane production,   etc   ; air; cattle; mixing;     Show all 5 Subjects
Abstract:
... The respiration chamber method is considered to be the most precise approach for measuring enteric methane emissions in cattle. A set of experimental runs was carried out in which increasing volumes of pure methane (168.5, 194.9, 234.9, 264.9, 301.0, 339.8, and 375.7 L per run) were gravimetrically released into open-circuit respiration chambers to simulate the volumes of methane eructated by catt ...
DOI:
10.1016/j.anifeedsci.2019.02.001

3. Computational Analysis of Linker Defective Metal–Organic Frameworks for Membrane Separation Applications

Author:
Kim, Hoeyeon; Lee, Sangwon; Kim, Jihan
Source:
Langmuir 2019 v.35 no.11 pp. 3917-3924
ISSN:
1520-5827
Subject:
methane,   etc   ; coordination polymers; hydrogen;     Show all 3 Subjects
Abstract:
... Intracrystalline defects in metal–organic frameworks (MOFs) are known to have crucial roles in dictating their material properties. In this work, computational simulations were used to induce linker vacancy defects in MOF membranes and to investigate their influence on H₂/CH₄ separation. Linker defective structures were created for the 228 candidate MOFs, and their separation performances were com ...
DOI:
10.1021/acs.langmuir.8b04175

4. Fluxes of N2O, CH4 and soil respiration as affected by water and nitrogen addition in a temperate desert

Author:
Yue, Ping; Cui, Xiaoqing; Gong, Yanming; Li, Kaihui; Goulding, Keith; Liu, Xuejun
Source:
Geoderma 2019 v.337 pp. 770-772
ISSN:
0016-7061
Subject:
methane; methane production,   etc   ; desert soils; nitrogen; nitrous oxide; soil respiration;     Show all 6 Subjects
Abstract:
... An experiment was conducted to investigate the effect of precipitation and N deposition on N2O and CH4 fluxes and soil respiration (Rs) in the Gurbantunggut Desert from September 2014 to August 2015. The desert was a weak sink for CH4 (−0.92 kg C ha−1 yr−1) and a small source of N2O (+0.13 kg N ha−1 yr−1) and the annual rate of Rs was 874 kg C ha−1. Our work confirmed a relatively strong sink for ...
DOI:
10.1016/j.geoderma.2018.10.020

5. Modeling the anaerobic co-digestion of solid waste: From batch to semi-continuous simulation

Author:
Kouas, Mokhles; Torrijos, Michel; Sousbie, Philippe; Harmand, Jérôme; Sayadi, Sami
Source:
Bioresource technology 2019 v.274 pp. 33-42
ISSN:
0960-8524
Subject:
methane; methane production,   etc   ; anaerobic digestion; data collection; models; solid wastes;     Show all 6 Subjects
Abstract:
... The main purpose of this study was to validate the use of a simple model for forecasting methane production in co-digestion reactors run semi-continuously using substrate data acquired in batch mode. Firstly, seven solid substrates were characterized individually in successive batches to assess their Biochemical Methane Potential (BMP) and kinetic parameters. Afterwards, eight mixtures of two, thr ...
DOI:
10.1016/j.biortech.2018.11.065

6. Comparison of five methods for the estimation of methane production from vented in vitro systems

Author:
Alvarez Hess, Pablo S; Eckard, Richard J; Jacobs, Joe L; Hannah, Murray C; Moate, Peter J
Source:
Journal of the science of food and agriculture 2019 v.99 no.1 pp. 109-116
ISSN:
0022-5142
Subject:
methane; methane production,   etc   ; bags; carbon dioxide; feeds; headspace analysis; prediction;     Show all 7 Subjects
Abstract:
... BACKGROUND: There are several methods for estimating methane production (MP) from feedstuffs in vented in vitro systems. One method (A; ‘gold standard’) measures methane proportions in the incubation bottle's headspace (HS) and in the vented gas collected in gas bags. Four other methods (B, C, D and E) measure methane proportion in a single gas sample from the HS. Method B assumes the same methane ...
DOI:
10.1002/jsfa.9149

7. Conversion of methane to ethylene using an Ir complex and phosphorus ylide as a methylene transfer reagent

Author:
Zatsepin, Pavel; Ahn, Seihwan; Pudasaini, Bimal; Gau, Michael R.; Baik, Mu-Hyun; Mindiola, Daniel J.
Source:
Chemical communications 2019 v.55 no.13 pp. 1927-1930
ISSN:
1364-548X
Subject:
methane,   etc   ; chemical reactions; ethylene; phosphorus;     Show all 4 Subjects
Abstract:
... Cp*(Me₃P)Ir(CH₃)(OTf), a complex known to reversibly activate CH₄ and other hydrocarbons under mild conditions, reacts with the phosphorus ylide H₂CPPh₃ in THF to afford two major species [Cp*(Me₃P)(Ph₃P)Ir(CH₂CH₃)][OTf] and [Cp*(Me₃P)Ir(H)(η²-CH₂CH₂)][OTf]. Insertion of the ylide methylene group can also occur with Cp*(Me₃P)Ir(Ph)(OTf) to afford the benzyl [Cp*(Me₃P)(Ph₃P)Ir(CH₂Ph)][OTf]. Theoret ...
DOI:
10.1039/c8cc08761j

8. Experimental investigation on near wall ignited lean methane/hydrogen/air flame

Author:
Wang, Du; Ji, Changwei; Wang, Shuofeng; Yang, Jinxin; Tang, Chuanqi
Source:
Energy 2019 v.168 pp. 1094-1103
ISSN:
0360-5442
Subject:
methane,   etc   ; air; combustion; heat; hydrogen;     Show all 5 Subjects
Abstract:
... The influences of wall are important in practical combustion devices. In present study, the propagating processes of near wall ignited laminar methane/hydrogen/air flame were explored under different hydrogen fractions in a constant volume combustion vessel mimicking engine geometry. Results showed that both effects of heat losses and wall compression cause difference of local flame speed at diffe ...
DOI:
10.1016/j.energy.2018.11.115

9. Numerical analysis of gas production from layered methane hydrate reservoirs by depressurization

Author:
Feng, Yongchang; Chen, Lin; Suzuki, Anna; Kogawa, Takuma; Okajima, Junnosuke; Komiya, Atsuki; Maruyama, Shigenao
Source:
Energy 2019 v.166 pp. 1106-1119
ISSN:
0360-5442
Subject:
methane,   etc   ; horizontal wells; permeability; Japan;     Show all 4 Subjects
Abstract:
... Many natural methane hydrate (MH) reservoirs are heterogeneous and are characterized by a layered structure. In this study, we numerically investigate gas production from a multi-layered hydrate reservoir by depressurization through a single vertical and a single horizontal well. This layered MH reservoir is constructed based on field test data at the AT1 site of the Eastern Nankai Trough in Japan ...
DOI:
10.1016/j.energy.2018.10.184

10. Experimental study on vented explosion overpressure of methane/air mixtures in manhole

Author:
Li, Pengliang; Huang, Ping; Liu, Zhenyi; Du, Bingxuan; Li, Mingzhi
Source:
Journal of hazardous materials 2019 v.374 pp. 349-355
ISSN:
0304-3894
Subject:
methane,   etc   ; air; cities; explosions; models; risk reduction;     Show all 6 Subjects
Abstract:
... Gas explosion in manhole often occurs in cities. Many previous researches on gas explosion are not suitable for manhole explosion because of the particularity of manhole structure. To investigate the gas explosion in manhole, a full-scale manhole model was established, in which the explosion overpressure of methane/air mixtures were studied experimentally. The variation of blast wave overpressure ...
DOI:
10.1016/j.jhazmat.2019.04.046

11. Magnetic-field effects on methane-hydrate kinetics and potential geophysical implications: Insights from non-equilibrium molecular dynamics

Author:
English, Niall J.; Allen, Christopher C.R.
Source:
The Science of the total environment 2019 v.661 pp. 664-669
ISSN:
0048-9697
Subject:
methane,   etc   ; geophysics; magnetic fields; molecular dynamics;     Show all 4 Subjects
Abstract:
... We have conducted non-equilibrium molecular-dynamics (NEMD) simulation to show that externally-applied magnetic fields, including their reversals in direction, have important effects on gas-release dynamics from methane hydrates. In particular, we apply fluctuation-dissipation analysis in the guise of Onsager's hypothesis to study hydrate kinetics at lower applied-field intensities, including temp ...
DOI:
10.1016/j.scitotenv.2019.01.041

12. Effect of Temperature on the Rate of Methane Hydrate Nucleation in Water-in-Crude Oil Emulsion

Author:
Sagidullin, A.K.; Stoporev, A.S.; Manakov, A.Yu.
Source:
Energy & fuels 2019 v.33 no.4 pp. 3155-3161
ISSN:
1520-5029
Subject:
methane,   etc   ; emulsions; fuels; oils; supercooling; temperature;     Show all 6 Subjects
Abstract:
... Isothermal nucleation of methane hydrate in the emulsions of water in oil has been studied experimentally at a pressure of 12.5 MPa within the temperature range of −3.0 to −4.9 °C (supercooling 17.8–19.7 °C). It was demonstrated that the experimental survival curves are composed of two regions with different slopes to the time axis. Nucleation rates calculated for initial and final (in parentheses ...
DOI:
10.1021/acs.energyfuels.9b00379

13. Experimental Study on the Morphology and Memory Effect of Methane Hydrate Reformation

Author:
Cheng, Chuan-Xiao; Tian, Yong-Jia; Wang, Fan; Wu, Xue-Hong; Zheng, Ji-Li; Zhang, Jun; Li, Long-Wei; Yang, Peng-Lin
Source:
Energy & fuels 2019 v.33 no.4 pp. 3439-3447
ISSN:
1520-5029
Subject:
methane,   etc   ; dissociation; dissolved gases; fuels; temperature;     Show all 5 Subjects
Abstract:
... The memory effect of hydrate reformation has an important influence on the hydrate growth mechanism and technological applications. This paper focuses on the relation between the morphologies and memory effects of hydrate reformation and the stability of the memory effect using a visual research method. The results indicated that the hydrate morphology differed between the first formation and the ...
DOI:
10.1021/acs.energyfuels.8b02934

14. Experimental Study of Methane Hydrate Formation in Water-Continuous Flow Loop

Author:
Fu, Weiqi; Wang, Zhiyuan; Yue, Xinjian; Zhang, Jianbo; Sun, Baojiang
Source:
Energy & fuels 2019 v.33 no.3 pp. 2176-2185
ISSN:
1520-5029
Subject:
methane,   etc   ; fuels; mass transfer; models; oils; temperature;     Show all 6 Subjects
Abstract:
... As the offshore oil and gas fields are maturing, the water production rate from the reservoir is increasing progressively year by year. The methane hydrate formation in water-continuous systems has become a significant flow assurance issue for offshore oil and gas production. In this study, a group of methane hydrate formation experiments are designed to study characteristics of hydrate formation ...
DOI:
10.1021/acs.energyfuels.9b00132

15. Insights into induction time and agglomeration of methane hydrate formation in diesel oil dominated dispersed systems

Author:
Chen, Jun; Chen, Guang-Jin; Yuan, Qing; Deng, Bin; Tao, Li-Ming; Li, Chuan-Hua; Xiao, Sheng-Xiong; Jiang, Jian-Hong; Li, Xu; Li, Jia-Yuan
Source:
Energy 2019 v.170 pp. 604-610
ISSN:
0360-5442
Subject:
methane,   etc   ; autoclaves; diesel fuel; gas hydrate;     Show all 4 Subjects
Abstract:
... Induction time and agglomeration of methane hydrate formation in dispersed systems play an important role in exploitation of natural gas hydrate, prevention of gas hydrate plug, and application of hydrate-based technologies. In this work, an autoclave with particle video microscope (PVM) probe was used to detect induction time of methane hydrate formation as a function of the water cut, dosage of ...
DOI:
10.1016/j.energy.2018.12.138

16. Micro-tubular flame-assisted fuel cells running methane, propane and butane: On soot, efficiency and power density

Author:
Milcarek, Ryan J.; Ahn, Jeongmin
Source:
Energy 2019 v.169 pp. 776-782
ISSN:
0360-5442
Subject:
methane,   etc   ; butanes; combustion; fuel cells; propane; soot;     Show all 6 Subjects
Abstract:
... A two-stage combustor with 1st-stage premixed fuel-rich combustion, integrated micro-tubular flame-assisted fuel cell (FFC) and 2nd-stage, fuel-lean combustion is described. The current state of research in direct flame fuel cells (DFFCs) is assessed and the dilemma of obtaining high power density, high electrical efficiency and no soot is discussed. A method for deriving the maximum theoretical e ...
DOI:
10.1016/j.energy.2018.12.098

17. Hydrothermal pretreatment of source separated organics for enhanced solubilization and biomethane recovery

Author:
Razavi, A.S.; Hosseini Koupaie, E.; Azizi, A.; Hafez, H.; Elbeshbishy, E.
Source:
Bioresource technology 2019 v.274 pp. 502-511
ISSN:
0960-8524
Subject:
methane,   etc   ; anaerobic digestion; biogas; solubilization; temperature;     Show all 5 Subjects
Abstract:
... The objective of this research was to evaluate the effect of the hydrothermal pretreatment on the solubilization of source separated organics (SSO) as well as the biomethane recovery through the mesophilic batch anaerobic digestion process. For this purpose, the SSO was subjected to fifteen different pretreatment conditions within five different severity index (SI) values (3, 3.5, 4, 4.5, and 5). ...
DOI:
10.1016/j.biortech.2018.12.024

18. A facile synthetic strategy for the creation of hollow noble metal/transition metal oxide nanocomposites

Author:
Lin, Xi-Jie; Sun, Tian-Qi; Yang, Li-Ping; Sun, Yong-Gang; Bin, De-Shan; Duan, Shu-Yi; Liu, Yuan; Lv, Rong-Wen; Cao, An-Min
Source:
Chemical communications 2019 v.55 no.8 pp. 1076-1079
ISSN:
1364-548X
Subject:
methane,   etc   ; catalysts; combustion; nanocomposites; nanoparticles; oxides;     Show all 6 Subjects
Abstract:
... We have reported an efficient synthetic protocol to build different hollow hybrid nanocomposites with tunable compositions, such as Au/TiO₂, Pt/ZrO₂, and Au/CeₓTi₁₋ₓO₂. The noble metal nanoparticles were well encapsulated in a wall composed of the designated transition metal oxides, showing promising potential as stable catalysts as demonstrated by Pt/ZrO₂ for methane combustion. ...
DOI:
10.1039/c8cc06650g

19. Gas recovery enhancement from methane hydrate reservoir in the Nankai Trough using vertical wells

Author:
Yu, Tao; Guan, Guoqing; Abudula, Abuliti; Yoshida, Akihiro; Wang, Dayong; Song, Yongchen
Source:
Energy 2019 v.166 pp. 834-844
ISSN:
0360-5442
Subject:
methane,   etc   ; permeability; synergism; wells; China; Japan;     Show all 6 Subjects
Abstract:
... The 2013/2017 Nankai Trough (Japan) and 2017 Shenhu Area (China) offshore methane hydrate production tests showed the world the possibility and feasibility of the oceanic methane hydrate production by depressurization. However, the relatively low gas production rate still remained as one of the critical bottlenecks for the economical utilization. This study chose the Nankai Trough as a target area ...
DOI:
10.1016/j.energy.2018.10.155

20. Validation and error assessment of the mobile tracer gas dispersion method for measurement of fugitive emissions from area sources

Author:
Fredenslund, A.M.; Rees-White, T.C.; Beaven, R.P.; Delre, A.; Finlayson, A.; Helmore, J.; Allen, G.; Scheutz, C.
Source:
Waste management 2019 v.83 pp. 68-78
ISSN:
0956-053X
Subject:
methane,   etc   ; gas emissions; gases; landfills; waste management;     Show all 5 Subjects
Abstract:
... A controlled release test was carried out to assess the accuracy of the tracer gas dispersion method, which is used to measure whole-site landfill methane (CH4) emissions as well as fugitive emissions from other area sources. Two teams performed measurements using analytical instruments installed in two vehicles, to measure downwind concentrations of target (CH4) and tracer gases at distances of 1 ...
DOI:
10.1016/j.wasman.2018.10.036