Preparation of Ru/graphene-meso-macroporous SiO2 composite and their application to the preferential oxidation of CO in H2-rich gases

Promoter effect of sodium in graphene-supported Ni and Ni–CeO2 catalyst for the low-temperature WGS reaction

“…On the other hand, the images of Ni-CeO 2 /G-Na showed well-dispersed nanoparticles throughout the sheets, and extended surface areas were covered. The size of these nanoparticles is in the range 2-3 nm, similar to values found in literature for the Ag/GO/CeO 2 system in which the synthesis was performed in the presence of a stabilizing agent [18]. On the other hand, the micrographs of the Ni-CeO 2 /G catalyst showed agglomerated nanoparticles, and ceria crystallites could be clearly distinguished in some areas (Fig.…”

“…Several studies can be found concerning the use of GO as support [12], catalyst by its own [13,14]and as precursor of graphene (G) or reduced graphene oxide (rGO) [15]. For this latter approach, both metal/G or metal/rGO [16,17] and metal/oxide/G or metal/oxide/rGO systems [18,19,20] have also been developed. The synthesis of the metal and oxide nanoparticles can be performed before its deposition on the support, for example by colloidal methods [19], or simultaneously to the synthesis of graphene [18].…”

“…For this latter approach, both metal/G or metal/rGO [16,17] and metal/oxide/G or metal/oxide/rGO systems [18,19,20] have also been developed. The synthesis of the metal and oxide nanoparticles can be performed before its deposition on the support, for example by colloidal methods [19], or simultaneously to the synthesis of graphene [18]. The resulting material provides good nanoparticle dispersion with homogeneous distribution [21].…”

Graphene supported heterogeneous catalysts: An overview

“…The recyclable ability of Pd/graphene catalyst system could be also due to its cross-coupling mechanism, which limits the re-deposition mechanism that normally occurred in other Pd support catalysts [214]. In general, the cross-coupling reactions play a key role in the synthesis of many important chemicals, including pharmaceuticals, herbicides, polymers and others [134,218]. Furthermore, the presence of C]C bonds along with the defect site within the graphene matrix results in its unique structure to obtain a better catalytic performance [219].…”

“…The irreversible aggregation of graphene imparts on its production, storage and processing [130]. Therefore, stabilization and functionalization of graphene via modification of materials are necessary to avoid the undesired aggregation, which in turn could extend its applications [134]. Aggregation of graphene can be alleviated by the attachment of polymers onto the graphene sheets [135,136].…”