Search results

1

Bromine catalyst for the methane to methyl bisulfate reaction

100%

Michalkiewicz B., Balcer S.

Polish Journal of Chemical Technology

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2012

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vol. 14

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issue 4

19-21

EN

A catalytic system KBr - oleum is effective at catalyzing the selective oxidation of methane to methanol via. methyl bisulfate. The influences of methane pressure, sulfur trioxide and temperature on turnover frequency were investigated.

2

Vibrationally resolved K-shell photoionization cross sections of methane

100%

Plésiat E., Decleva P., Martín F.

Open Physics

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2013

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vol. 11

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issue 9

1157-1162

EN

We use an extension of the static-exchange density functional theory (DFT) method, previously reported in [E. Plésiat et al., Phys. Rev. A 2, 023409 (2012), E. Plésiat, P. Decleva, F. Martín, Phys. Chem. Chem. Phys. 31, 10853 (2012)], to evaluate vibrationally resolved (total and angular) K-shell photoelectron cross sections of methane. The calculated cross sections are in very good agreement with the existing experimental measurements at low photoelectron energies. We show that, in contrast with the rich interference patterns previously observed in molecular frame C(1s) photoelectron angular distributions of methane at both low and high photoelectron energy, no interference effects are observed in the calculated β parameters, even at high photon energies.

3

Assessment of the possibility of the methane to methanol transformation

88%

Michalkiewicz B.

Polish Journal of Chemical Technology

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2008

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vol. 10

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issue 2

20-26

EN

The methane to methanol conversion via esterification is an interesting method which makes it possible to eliminate the otherwise necessary phase of obtaining synthesis gas. On the basis of laboratory investigations mass balances for this process were determined. Preliminary assessment of the way of conducting the process and possibilities of practical applications of this technology was also made. It was pointed out that regardless of any possible modifications of methane to methanol conversion via esterification redundant sulfuric acid will always be produced during ester hydrolysis. Production of methanol from methane using this method can only be done when it is combined with producing other substances, which needs using H2SO4.

4

Bio-methanization of organic fraction from municipal solid waste: temperature effects

88%

Fernández-Rodríguez J., Pérez M., Romero L. I.

Polish Journal of Chemical Technology

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2013

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vol. 15

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issue 2

99-106

EN

The main objective of this study was to analyse the development of dry anaerobic digestion process of OFMSW in batch reactors under two temperature ranges, thermophilic (55°C) and mesophilic (35°C). The experimental results lead to the conclusion that the thermophilic range has a greater rate of hydrolysis and is therefore more effective to degrade wastes, shortening the overall operating time. For example, the hydrolytic step in the thermophilic (T) process lasted an average of 8 days versus 14 days in the mesophilic (M) range. The methanogenic phase lasted for 18 and 29 days in the T and M processes, respectively. The mesophilic range showed higher removal of the organic effluent but with greater uptime requirements. Moreover, the thermophilic range showed greater productivities than the mesophilic range, and the productivities were approximately doubled in terms of the produced biogas from a given amount of consumed organic matter.

5

Small intestine bacterial overgrowth is frequent in cystic fibrosis: combined hydrogen and methane measurements are required for its detection

88%

Lisowska A., Wójtowicz J., Walkowiak J.

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issue 4

631-634

EN

Introduction: Hydrogen breath test (BT) is commonly used as a diagnostic tool for the detection of small intestine bacterial overgrowth (SIBO). It was reported that colonic methane production is far more frequent in cystic fibrosis (CF) patients than in other subjects. Therefore, measuring exclusively hydrogen in the diagnostic breath test for diagnosing SIBO might be of limited value. We aimed to assess the usefulness of combined measurement of hydrogen and methane expiration for the diagnosis of SIBO in CF. Material and Methods: The study comprised 62 CF patients aged 5 to 18 years. Three-hundred-ninety subjects assessed due to gastrointestinal symptoms for the presence of SIBO served as a comparative group. In all subjects hydrogen/methane BT using glucose was performed. A positive BT was defined as fasting hydrogen ≥ 20 ppm or fasting methane ≥ 10 ppm or a rise of ≥ 12 ppm hydrogen or ≥ 6 ppm methane over baseline during the test. Results: In 23 (37.1%) CF patients and in 52 (13.3%) subjects from the comparative group abnormal BT results were found. In seven (11.3%) CF patients and 29 (7.4%) of the other subjects studied methane measurement allowed diagnosis of SIBO. Conclusions: Small intestine bacterial overgrowth is frequent in cystic fibrosis. For its detection in cystic fibrosis and other gastrointestinal patients, combined hydrogen and methane measurement instead of hydrogen breath test should be applied. Without the additional measurement of methane a significant percentage of SIBO will be missed.

6

Hard coal mining in India and the opportunities for application of foregoing demethanization in Moonidih colliery

88%

Wierzbicki M.

Gospodarka Surowcami Mineralnymi

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2018

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vol. 34

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issue 2

7

Impact Assessment of Sorption Properties of Coal on Methane Emissions Into Longwall Working

88%

Koptoń H., Koptoń H.

Archives of Mining Sciences

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2020

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vol. 65

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issue 3

8

Homogeneous catalytic systems for selective oxidation of methane: state of the art

88%

Balcer S.

|

EN

Homogeneous catalysts for methane oxidation are of a particular interest from scientific and economic points of view. The results show a great potential for activation and functionalization of CH bonds of unreactive methane. There are still gaps in the knowledge of how to rationally design catalysts for this process. In this paper state-of-the-art. in methane oxidation homogenous catalysis is presented.

9

The dilution effect on the extinction of wall diffusion flame

75%

Ghiti N.

Archives of Thermodynamics

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2014

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issue 4

10

The Impact of the Degree of Coalification on the Sorption Capacity of Coals from the Zofiówka Monocline

75%

Godyń K., Dutka B.

Archives of Mining Sciences

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2018

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vol. 63

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issue 3

11

Modeling of Methane and Air Velocity Behavior in an Auxiliary Ventilated Coal Heading

75%

Daloğlu G., Önder M., Parra T., Daloğlu G., Önder M., Parra T.

Archives of Mining Sciences

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2021

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vol. 66

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issue 1

12

Use of underground space for the storage of selected gases (CH4, H2, and CO2) – possible conflicts of interest

75%

Tarkowski R., Uliasz-Misiak B., Tarkowski R., Uliasz-Misiak B.

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issue 1

Refine search results

Bromine catalyst for the methane to methyl bisulfate reaction

Vibrationally resolved K-shell photoionization cross sections of methane

Assessment of the possibility of the methane to methanol transformation

Bio-methanization of organic fraction from municipal solid waste: temperature effects

Small intestine bacterial overgrowth is frequent in cystic fibrosis: combined hydrogen and methane measurements are required for its detection

Hard coal mining in India and the opportunities for application of foregoing demethanization in Moonidih colliery

Impact Assessment of Sorption Properties of Coal on Methane Emissions Into Longwall Working

Homogeneous catalytic systems for selective oxidation of methane: state of the art

The dilution effect on the extinction of wall diffusion flame

The Impact of the Degree of Coalification on the Sorption Capacity of Coals from the Zofiówka Monocline

Modeling of Methane and Air Velocity Behavior in an Auxiliary Ventilated Coal Heading

Use of underground space for the storage of selected gases (CH4, H2, and CO2) – possible conflicts of interest