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Modification of a Commercial Activated Carbon with Nitrogen and Boron : = Hydrogen Storage Application.

紀錄類型:	書目-語言資料,手稿 : Monograph/item
正題名/作者:	Modification of a Commercial Activated Carbon with Nitrogen and Boron :/
其他題名:	Hydrogen Storage Application.
作者:	Morande Thompson, Arturo Ignacio.
面頁冊數:	1 online resource (126 pages)
附註:	Source: Masters Abstracts International, Volume: 84-09.
Contained By:	Masters Abstracts International84-09.
標題:	Transportation. -
電子資源:	click for full text (PQDT)
ISBN:	9798374494761

Modification of a Commercial Activated Carbon with Nitrogen and Boron : = Hydrogen Storage Application.
Morande Thompson, Arturo Ignacio.

Modification of a Commercial Activated Carbon with Nitrogen and Boron :Hydrogen Storage Application. - 1 online resource (126 pages)

Source: Masters Abstracts International, Volume: 84-09.

Thesis (M.E.Sc.)--Pontificia Universidad Catolica de Chile (Chile), 2022.

Includes bibliographical references

In this study, a commercial activated carbon with a specific surface area (SSA) of 1678 m2 /g was studied and modified to store hydrogen through physical adsorption at 77 K. For this purpose, different modification methods were considered. Helium treatments at 200 and 400 °C were applied to reduce the concentration of oxygenated functional groups on the surface of the original sample; ammonia modifications at 400, 500 and 600 °C were carried out to produce nitrogen-doped samples; and borax decahydrate impregnations were performed to dope the samples with boron. A total of 13 samples were produced by applying these three main modifications methods in different orders. These samples were analyzed and characterized by nitrogen adsorption/desorption isotherms, temperatureprogrammed decompositions, X-ray photoelectron spectroscopies, and hydrogen adsorption isotherms. In addition, the Dubinin-Astakhov adsorption model was applied to extrapolate the hydrogen adsorption experimental data up to 100 bar pressure, and a density-functional theory model was developed to analyze the effect of the nitrogen functionalities on hydrogen adsorption. Based on the results, it was concluded that the best modification procedure was the helium treatment at 400 °C followed by an ammonia treatment at 500 °C, increasing the hydrogen adsorption from 1.98 to 2.34 wt%. All Bdoped samples reduced their hydrogen adsorption due to the loss of SSA, although the adsorption per area (i.e., wt%/SSA) increased.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798374494761Subjects--Topical Terms:

558117
Transportation.
Index Terms--Genre/Form:

554714
Electronic books.

Modification of a Commercial Activated Carbon with Nitrogen and Boron : = Hydrogen Storage Application.
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500 $a Source: Masters Abstracts International, Volume: 84-09.
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504 $a Includes bibliographical references
520 $a In this study, a commercial activated carbon with a specific surface area (SSA) of 1678 m2 /g was studied and modified to store hydrogen through physical adsorption at 77 K. For this purpose, different modification methods were considered. Helium treatments at 200 and 400 °C were applied to reduce the concentration of oxygenated functional groups on the surface of the original sample; ammonia modifications at 400, 500 and 600 °C were carried out to produce nitrogen-doped samples; and borax decahydrate impregnations were performed to dope the samples with boron. A total of 13 samples were produced by applying these three main modifications methods in different orders. These samples were analyzed and characterized by nitrogen adsorption/desorption isotherms, temperatureprogrammed decompositions, X-ray photoelectron spectroscopies, and hydrogen adsorption isotherms. In addition, the Dubinin-Astakhov adsorption model was applied to extrapolate the hydrogen adsorption experimental data up to 100 bar pressure, and a density-functional theory model was developed to analyze the effect of the nitrogen functionalities on hydrogen adsorption. Based on the results, it was concluded that the best modification procedure was the helium treatment at 400 °C followed by an ammonia treatment at 500 °C, increasing the hydrogen adsorption from 1.98 to 2.34 wt%. All Bdoped samples reduced their hydrogen adsorption due to the loss of SSA, although the adsorption per area (i.e., wt%/SSA) increased.
520 $a En esta investigacion, se estudio y modifico un carbon activado comercial con una superficie especifica (SSA) de 1678 m2/g con la finalidad de almacenar hidrogeno mediante la adsorcion fisica a 77 K. Para este proposito, se consideraron diferentes metodos de modificacion. Se llevaron a cabo tratamientos con helio a 200 y 400 °C para reducir la concentracion de grupos funcionales oxigenados en la superficie de la muestra original; se realizaron modificaciones con amoniaco a 400, 500 y 600 °C para producir muestras dopadas con nitrogeno; y se realizaron impregnaciones con borax decahidratado para dopar las muestras con boro. Se produjeron un total de 13 muestras mediante estos tres metodos de modificacion, los que fueron aplicados en diferentes ordenes. Las muestras se analizaron y caracterizaron mediante isotermas de adsorcion/desorcion de nitrogeno, descomposiciones programadas por temperatura, espectroscopias fotoelectronicas de rayos X e isotermas de adsorcion de hidrogeno. Adicionalmente, se aplico el modelo de adsorcion de Dubinin-Astakhov para extrapolar los datos experimentales de adsorcion de hidrogeno hasta una presion de 100 bares, y se desarrollo un modelo de teoria del funcional de la densidad para analizar el efecto de lasfuncionalidades nitrogenadas en la adsorcion de hidrogeno. En base a los resultados, se concluyo que el mejor procedimiento de modificacion fue el tratamiento con helio a 400 °C seguido de un tratamiento con amoniaco a 500 °C, lo que aumento la adsorcion de hidrogeno desde un 1,98% a un 2,34% en peso. Ademas, todas las muestras dopadas con boro redujeron su adsorcion de hidrogeno debido a la perdida de superficie especifica, aunque aumento la adsorcion por unidad de area, es decir, % en peso/SSA.
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