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Producción y almacenamiento combinados de hidrógeno con posterior cristalización de carbono
Angela D Lueking1, Humberto R Gutierrez, Dania A Fonseca
1The Pennsylvania State University, 120 Hosler, University Park, Pennsylvania 16802-5000, USA. adl11@psu.edu
Journal of the American Chemical Society
|June 15, 2006
Resumen
Este estudio revela la liberación de hidrógeno a baja temperatura y la captura en carbón de antracita modificado. El calentamiento acelera esta evolución del hidrógeno, lo que sugiere que impulsa la formación de nuevas estructuras de carbono cristalino.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- Química Química es la química.
- La geoquímica es la geoquímica.
Sus antecedentes:
- Los derivados del carbón de la antracita se pueden sintetizar utilizando el fresado reactivo de bolas.
- Los procesos de molienda de alta energía pueden crear estructuras de carbono metastables.
Objetivo del estudio:
- Para investigar la evolución del hidrógeno a baja temperatura y el atrapamiento en derivados de carbón de antracita.
- Para explorar la relación entre la liberación de hidrógeno y la transformación de la estructura de carbono.
Principales métodos:
- Molinado reactivo de bolas de carbón de antracita con ciclohexeno.
- Espectroscopia Raman para detectar las vibraciones de hidrógeno molecular.
- Análisis térmico para estudiar la cinética de la evolución del hidrógeno.
- Microscopia y espectroscopia para caracterizar las estructuras de carbono.
Principales resultados:
- Evidencia de la evolución del hidrógeno a baja temperatura y el atrapamiento en derivados de carbón de antracita.
- Liberación de hidrógeno observada a temperatura ambiente, acelerada por el calentamiento por encima de 60°C.
- Formación de carbonos cristalinos, incluyendo el diamante nanocristalino y las regiones grafíticas.
- Identificación de una nueva forma de carbono cristalino rodeado de carbono amorfo.
Conclusiones:
- El atrapamiento de hidrógeno y la liberación lenta ocurren en derivados de carbón de antracita molida.
- La evolución del hidrógeno parece inducir la cristalización de los materiales amorfos de carbono.
- Los carbonos hidrogenados metastables se reorganizan en formas más estables, liberando hidrógeno molecular.
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