Ni-Co bimetallic catalysts for the simultaneous production of carbon nanofibres and syngas through biogas decomposition

Co-, Cu- and Fe-Doped Ni/Al2O3 Catalysts for the Catalytic Decomposition of Methane into Hydrogen and Carbon Nanofibers

“…Some differences were observed after doping with respect to the metal employed: while Fe hardly improved the reducibility of the catalyst, Co and Cu showed shifts of 23 and 122 • C towards lower temperatures, respectively, of the main reduction of Ni II to Ni 0 (peak 1) found at 340 • C in the Ni/Al catalyst. This peak is associated to the reduction of unsupported NiO to Ni [41], where reducibility improvement is due to defects and dislocations in the Ni crystal lattice after the incorporation of Cu or Co atoms [42,43]. In addition, Cu doping led to the appearance of an H 2 consumption peak at 170 • C attributed to the CuO reduction (Cu II to Cu 0 : peak 4).…”

“…In addition, other crystalline phases as NiCo 2 O 4 spinel [46,47] or Fe 2 O 3 , were also detected in Ni-Co/Al and Ni-Fe/Al catalysts, respectively. Co 3 O 4 is indistinguishable by XRD because its reflections are overlapped (and hidden) with those of the NiO [43]. After reduction, planes of the fcc system of the Ni or of its alloy, (111), (200), and (220), were detected at 44.5, 51.9 and 76.4 • , respectively [48].…”

Spatially Self‐Confined Formation of Ultrafine NiCoO2 Nanoparticles@Ultralong Amorphous N‐Doped Carbon Nanofibers as an Anode towards Efficient Capacitive Li+ Storage

“…These NPs located on the surface are not naked, but coated uniformly with a thin carbon shell of about 4–7 nm in thickness, as shown by the region delineated by a white dotted line in Figure c. Closer inspection of the region in the red rectangle in Figure c (Figure d) revealed well‐defined lattice fringes of 0.357 nm for the carbon shell, corresponding to d (002) of graphitic carbon. Indeed, the unique graphited structure may originate from the catalytic effect of Ni/Co species . However, the interlayer spacing is somewhat larger than that of perfect graphite (0.335), owing to the heteroatom doping of elemental N (≈9.4 atom %; see Figure S4 in the Supporting Information) .…”

“…Indeed, the unique graphited structure may originate from the catalytic effect of Ni/Cos pecies. [13,19] However,t he interlayer spacing is somewhat larger than that of perfect graphite (0.335), owing to the heteroatom doping of elementalN Scheme1.Schematicillustration of the fabrication process of NCO@ANCNFs. ( % 9.4 atom %; see Figure S4 in the Supporting Information).…”

Synthesis of reduced graphene oxide nanosheets using nanofibers from methane and biogas thermal decomposition with various catalysts

“…Moreover, this method is an alternative way of hydrogen production from natural gas, biogas, syngas and other hydrocarbons (Bjorn Gaudernack 1998;Benard and Chahine 2007;Goodman et al 2006;Rostrup-Nielsen et al 1998). Biogas mainly composed of CH 4 and CO 2 generally is used for the generation of heat, electricity, combined heat and power, different alternatives for utilization, in the production of syngas (H 2 and CO) or hydrogen (Pinilla et al 2017). Different parameters used in the catalyst thermal decomposition process, such as temperature, various catalysts, and gasses, form carbon nanofilaments such as single-wall nanotubes, multi-wall nanotubes, a platelet, fishbone solid, fishbone hollow core, ribbon, and stacked cup (Martin-Gullon et al 2006).…”