Hydrogen from coal

Moore, Tim A.; Pearce, Steven

doi:10.1016/j.coal.2005.05.001

Cited by 18 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Shale has a relatively low adsorption capacity (generally less than 2 cm 3 /g) compared with coal (generally above 10 cm 3 /g) − and is sensitive to experimental technologies and conditions. The impact of some factors on the adsorption amount during the MIAE is amplified, which leads to the occurrence of adsorption reduction .…”

Section: Introductionmentioning

confidence: 99%

Impacting Factors, Dynamic Process, and Correction of Adsorption Reduction in Shale Reservoir: A Case Study on Shale Samples from the Western Guizhou

Wei

Wang

et al. 2020

ACS Omega

View full text Add to dashboard Cite

Adsorption reduction occurring during isothermal experiment leads to the failure of telling the true adsorption capacity of shale reservoir. A correct understanding of this will be helpful in improving the accuracy of resource estimation and economic evaluation of shale gas reserves. Six shale samples were collected from the Permian Longtan Formation in the western Guizhou Province, China. Volumetric methane isotherm adsorption experiment and data processing were conducted in this research. The study investigates the effect of free space volume reduction (FSVR), excess adsorption amount conversion (EAAC), and blank test correction (BTC) on adsorption reduction, the understanding of the dynamic process of adsorption reduction, and the evaluation of the way of weakening and correcting this phenomenon. The conclusions are as follows. (1) Adsorption reduction does exist in the shale sample. The adsorption process of methane in the shale sample can be divided into the strong adsorption stage, approximate saturation stage, and adsorption reduction stage. (2) Shale adsorbing methane has a positive effect on the experimental adsorption amount. Comparatively, free space volume, excess adsorption amount, and blank test have negative effects. Adsorption reduction is the result of combined influence of positive and negative effects above. (3) At the first two stages of methane adsorption, the positive effect is greater than the negative effect, resulting in the hidden of adsorption reduction, and the experimental adsorption amount increases with the growth of experimental pressure. While at the adsorption reduction stage, the former effect is smaller than the latter, and their difference increases as the experimental pressure increases. It leads to the occurrence of adsorption reduction, and the phenomenon becomes increasingly obvious. (4) FSVR has the strongest impact on the weakening of adsorption reduction, followed by EAAC and BTC. The adsorption reduction in shale reservoir can be corrected effectively by BTC and EAAC.

show abstract

Section: Introductionmentioning

confidence: 99%

Impacting Factors, Dynamic Process, and Correction of Adsorption Reduction in Shale Reservoir: A Case Study on Shale Samples from the Western Guizhou

Wei

Wang

et al. 2020

ACS Omega

View full text Add to dashboard Cite

show abstract

“…Alkali ve toprak alkali metal tuzları, geçiş metalleri ve bunların kompozitleri gibi farklı katalizörler katalitik kömür gazlaştırma proseslerinde kullanılmaktadır [5]. Geleceğin yakıtı olarak hidrojen, su buharı gazlaştırma tekniği ile kömürden üretilebilir [6,7]. Alkali metal tuzları (özellikle potasyum), 1970'lerden bu yana karbondan hidrojen üretiminde yaygın katalizörler olarak kullanılmaktadır [8].…”

Section: Introductionunclassified

Tunçbilek Linyitinin Sorgum Biyokütlesi ve Biyokütle Hidrolizatı ile Birlikte Gazlaştırılması

Seçer¹

2020

Süleyman Demirel Üniversitesi Fen Bilimleri Enstitüsü Dergisi

View full text Add to dashboard Cite

Özet: Bu çalışmada, yüksek oranda kükürt (%1,2) ve kül (%20,6) içeren Tunçbilek linyiti, öğütülmüş katı sorgum (green go) ve sub-kritik su koşullarında hidroliz edilmiş sorgum hidrolizatı ile birlikte gazlaştırılarak gaz ürün dağılımı ve birlikte gazlaştırma işlemine sorgumun sinerjik etkisi incelenmiştir. Öğütülmüş katı sorgum ve sorgum hidrolizatı ile yapılan birlikte gazlaştırma deneylerinden elde edilen gaz hacimleri, Tunçbilek linyitinin tek başına gazlaştırılmasından elde edilenden daha fazla olduğu görülmüştür. En yüksek toplam gaz hacmi (2810 mL) ve hidrojen verimi (%70,1) 900 °C sıcaklıkta sorgum hidrolizatı ile yapılan birlikte gazlaştırma deneylerinden elde edilmiştir.

show abstract

“…Methane adsorption behaviors of TDCs are affected by factors such as temperature, pressure, metamorphism degree, macerals composition, deformation degree, pore structure, chemical structure, and so on. − They are studied mainly by the methane isotherm adsorption experiment (MIAE). − Zhang et al explored the influence of coal petrological composition on methane adsorption based on MIAE and discovered that the increase of coal rank and vitrinite content and the decrease of inertinite content can enhance methane adsorption capacity . Pan et al investigated the methane adsorption capacity of low-rank TDC samples under various pressures and temperature conditions and they believed that the variations of temperature and pressure can lead to changes in the methane adsorption capacity .…”

Section: Introductionmentioning

confidence: 99%

Variation of Surface Free Energy in the Process of Methane Adsorption in the Nanopores of Tectonically Deformed Coals: A Case Study of Middle-Rank Tectonically Deformed Coals in the Huaibei Coalfield

Wei

Wang

et al. 2019

Energy Fuels

View full text Add to dashboard Cite

Methane adsorption of coal is essentially a process of energy and material state transformation. It is a complex process especially for tectonically deformed coals (TDCs). In order to clarify this process, 12 middle-rank TDCs were screened for the experimental and theoretical study. On the basis of the liquid nitrogen adsorption experiment and methane isothermal adsorption experiment, the nanopore structure and the methane adsorption capacity of the TDC samples were analyzed. Using the theories of Polanyi adsorption potential and surface free energy reduction (SFER), the variation of energy in the process of methane adsorption in nanopores was explored. The following results were obtained. (1) The Langmuir volume has a stronger positive relationship with the specific surface area of the ultra-micropore, mild-micropore, and micropore than with those of the transitional pore. The adsorption potential decreases as the adsorption space grows; however, it rises as tectonic deformation enhances. The increase in the ratio of specific surface area for the mild-micropore and ultra-micropore indicates that the tectonic deformation can enhance both the available adsorption area and adsorption potential for methane in TDCs, eventually resulting in the increase of the Langmuir volume and the SFER. (2) The methane molecules preferentially occupy the sites with strong adsorption potential on the coal surface during the strong adsorption stage, resulting in the sharp increase of the methane adsorption volume and SFER. Then, the number of sites with strong adsorption potential decreases and the methane molecules have to settle at the energetically suboptimal sites during the weak adsorption stage, leading to the slight increase of methane adsorption volume and SFER. The above results may help to improve the accuracy of coalbed methane resource estimations and gas outburst prediction in the area where TDCs are developed.

show abstract

Hydrogen from coal

Cited by 18 publications

References 0 publications

Impacting Factors, Dynamic Process, and Correction of Adsorption Reduction in Shale Reservoir: A Case Study on Shale Samples from the Western Guizhou

Impacting Factors, Dynamic Process, and Correction of Adsorption Reduction in Shale Reservoir: A Case Study on Shale Samples from the Western Guizhou

Tunçbilek Linyitinin Sorgum Biyokütlesi ve Biyokütle Hidrolizatı ile Birlikte Gazlaştırılması

Variation of Surface Free Energy in the Process of Methane Adsorption in the Nanopores of Tectonically Deformed Coals: A Case Study of Middle-Rank Tectonically Deformed Coals in the Huaibei Coalfield

Contact Info

Product

Resources

About