title: Critical review of existing nanomaterial adsorbents to capture carbon dioxide and methane.
abstract: Innovative gas capture technologies with the objective to mitigate CO2and CH4emissions are discussed in this review. Emphasis is given on the use of nanoparticles (NP) as sorbents of CO2and CH4, which are the two most important global warming gases. The existing NP sorption processes must overcome certain challenges before their implementation to the industrial scale. These are: i) the utilization of the concentrated gas stream generated by the capture and gas purification technologies, ii) the reduction of the effects of impurities on the operating system, iii) the scale up of the relevant materials, and iv) the retrofitting of technologies in existing facilities. Thus, an innovative design of adsorbents could possibly address those issues. Biogas purification and CH4storage would become a new motivation for the development of new sorbent materials, such as nanomaterials. This review discusses the current state of the art on the use of novel nanomaterials as adsorbents for CO2and CH4. The review shows that materials based on porous supports that are modified with amine or metals are currently providing the most promising results. The Fe3O4-graphene and the MOF-117 based NPs show the greatest CO2sorption capacities, due to their high thermal stability and high porosity. Conclusively, one of the main challenges would be to decrease the cost of capture and to scale-up the technologies to minimize large-scale power plant CO2emissions.
authors.affiliation: Department of Chemical, Biological and Environmental Engineering, Escola d'Enginyeria, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain. Electronic address: amanda.alonso@uab.cat.
authors.forename: Amanda
authors.initials: A
authors.lastname: Alonso
authors.affiliation: Department of Chemical, Biological and Environmental Engineering, Escola d'Enginyeria, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain.
authors.forename: J
authors.initials: J
authors.lastname: Moral-Vico
authors.affiliation: Department of Chemical, Biological and Environmental Engineering, Escola d'Enginyeria, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain.
authors.forename: Ahmad
authors.initials: A
authors.lastname: Abo Markeb
authors.affiliation: Applied Nanoparticles S.L, Carrer Còrcega 516, 08025 Barcelona, Spain.
authors.forename: Martí
authors.initials: M
authors.lastname: Busquets-Fité
authors.affiliation: Department of Chemical, Biological and Environmental Engineering, Escola d'Enginyeria, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain; Department of Environmental Engineering, Democritus University of Thrace, Xanthi 67132, Greece.
authors.forename: Dimitrios
authors.initials: D
authors.lastname: Komilis
authors.affiliation: Institut Català de Nanotecnologia (ICN), Campus de la UAB, 08193 Bellaterra, Spain; Institució Catalana de Recerca i EstudisAvançats (ICREA), Passeig Lluís Companys, 23, 08010 Barcelona, Spain.
authors.forename: Victor
authors.initials: V
authors.lastname: Puntes
authors.affiliation: Department of Chemical, Biological and Environmental Engineering, Escola d'Enginyeria, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain.
authors.forename: Antoni
authors.initials: A
authors.lastname: Sánchez
authors.affiliation: Department of Chemical, Biological and Environmental Engineering, Escola d'Enginyeria, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain.
authors.forename: Xavier
authors.initials: X
authors.lastname: Font
keywords: Adsorption; Carbon dioxide; Metal organic framework; Methane; Nanomaterials; Zeolite