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Título del libro: Advances In Co2 Capture, Separation And Utilization Through Various Physicochemical Mechanisms Using Alkaline Ceramics

Autores UNAM:
HERIBERTO PFEIFFER PEREA;

Autores externos:

Idioma:
Inglés

Año de publicación:
2016

Palabras clave:

Alkaline ceramics; CO2 capture; CO2 separation; Reforming processes; Sorption enhanced steam reforming

Resumen:

New technologies such as carbon capture and storage (CCS), including membrane separation, among others, are needed to reduce net gas emissions. Thus, the combination of using more efficient processes together with CO2 capture technologies must decrease CO2 emissions while renewable sources of energy are globally extended. Some emerging technologies in this field are carbonate-base systems, ammonia-based wet scrubbing, adsorption in porous materials, enzyme-based systems and the use of ionic liquids-based technologies, among others. Additionally, membrane technology is a promising separation method that overcomes the disadvantages of conventional gas absorption towers and the absorption process would offer a very high selectivity and high driving force in spite of the low partial pressure of CO2. Among the carbonate-based systems different alkaline and earth-alkaline ceramics have been proposed as possible CO2 captors in a wide temperature range. The most studied alkaline and earth alkaline ceramics, within this scope, are CaO, MgO, Li4SiO4, Li8SiO6, Li5AlO4, Li2CuO2, Li2ZrO3, Li6Zr2O7, Na2ZrO3 and Na2SiO3. Simultaneously, the separation and purification processes are often required in pre-combustion and post-combustion, CO oxidation and steam reforming (SR) processes, among others. For example, in steam reforming (SR), the H2/CO ratio can be varied by manipulating the relative concentrations of CO2 and O2 in the feed, which can be achieved via selectivity adsorbing the co-generated CO2 on a proper and affective sorbent and or by carbon monoxide oxidation. In this regard, some alternatives have been proposed using the same kind of ceramics, for example, (i) sorption enhanced steam reforming (SESR) and (ii) membrane-based technology (considered as a potential separation and purification technique in the syngas production). Also, various methods have been proposed for CO removal, such a selective diffusion, pressure swing adsorption, selective CO oxidation, and CO methanation. Catalytic oxidation of CO in H2-rich gas is considered a promising method and the most costeffective approach for eliminating CO from reformed fuels. In this context, some alkaline ceramics have been proposed as bifunctional materials, during the CO oxidation and subsequently as CO2 sorbents. © 2016 Nova Science Publishers, Inc.

Entidades citadas de la UNAM:

Fuente:

ISBN:
9781634853347
Editorial:
Nova Science Publishers, Inc. Nombre de la publicación:
Advances in CO2 capture, separation and utilization through various physicochemical mechanisms using alkaline ceramics
Página inicial:
123
Página final:
148