@Article{GomesAmaOliBalSil:2021:StChCa,
               author = "Gomes, Mariany Ludgero Maria and Amaral-Labat, Gisele Aparecida 
                         and Oliveira, Ana Paula Silva de and Baldan, Maur{\'{\i}}cio 
                         Ribeiro and Silva, Adriana Maria da",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto 
                         Nacional de Pesquisas Espaciais (INPE)} and {Instituto Nacional de 
                         Pesquisas Espaciais (INPE)} and {Instituto Nacional de Pesquisas 
                         Espaciais (INPE)} and {Instituto Nacional de Pesquisas Espaciais 
                         (INPE)}",
                title = "Study and characterization of carbon xerogels from 
                         tannin-formaldehyde system as catalyst support applications",
              journal = "Mat{\'e}ria",
                 year = "2021",
               volume = "26",
               number = "2",
                pages = "e12997",
             keywords = "Carbon xerogels, Catalyst support, Renewable process, Tannin.",
             abstract = "This contribution reports the use of an organic gel, xerogel, as 
                         catalyst support for Cu. The xerogel was synthesized from the 
                         system tannin-formaldehyde at pH 3, using F-127 Pluronic as 
                         surfactant. The surface area values were higher than 900 m2/g even 
                         after the Cu (10%, wt) impregnation. The morphological analysis by 
                         SEM-FEG revealed the presence of spheres arranged in a 
                         tridimensional structure. XRD diffractograms showed the presence 
                         of CuO and Cu2O crystalline phases combined with the amorphous 
                         structure of the porous carbon. From XRD analysis it is possible 
                         to infer the Cu species are heterogeneously dispersed on the 
                         support with the co-existence of small and larger clusters, which 
                         is in agreement with Raman spectroscopy. Raman study also 
                         indicated a highly defect/disorder structure of the xerogel 
                         derivatives, ensuing the short-range structural order of the 
                         carbonic structure and oxygen groups decorating the carbon 
                         surface. XPS results corroborate with XRD and Raman results, 
                         detecting the presence of CuO and Cu2O. In addition to the 
                         mentioned Cu species, XPS also detected Cu0 which may be 
                         originated from the chemical interaction between the electron 
                         oxygen groups with the Cu precursor. The high surface area and the 
                         thermal stability (~ 300oC) of Cu/XCTF envisages its feasibly for 
                         relevant catalytic applications. © 2021, Universidade Federal do 
                         Rio de Janeiro.",
                  doi = "10.1590/S1517-707620210002.1297",
                  url = "http://dx.doi.org/10.1590/S1517-707620210002.1297",
                 issn = "1579-2641",
             language = "en",
           targetfile = "gomes_study.pdf",
        urlaccessdate = "23 maio 2024"
}