Synthesis of carbon nano-chains from glycerol-ethanol decomposition over Ni-Fe alloy catalyst

The Relationship between Reaction Temperature and Carbon Deposition on Nickel Catalysts Based on Al2O3, ZrO2 or SiO2 Supports during the Biogas Dry Reforming Reaction

“…According to the literature, functional groups physically or chemically adsorbed onto carbon nanomaterials decompose below 200 • C, while amorphous carbon species combust at temperatures between 200-500 • C in air rich environments. Carbon allotropes, such as carbon nanofibers (CNFs), carbon nanotubes (CNTs) or fullerenes with different structural arrangements and defects inserted in their graphitic lattice, combust between 500 and 600 • C. More graphitic structures, such as graphite, graphene and highly graphitized CNTs, with almost perfect graphene sheet arrangements, are burnt between 600 and 800 • C [48][49][50]. In the case of CNTs, the oxidation temperature depends also on the number of walls, the presence of the catalyst, and their inner and outer diameters that can influence the graphene sheets curvature [51].…”

Tribochemistry, Mechanical Alloying, Mechanochemistry: What is in a Name?

“…Also the mechanochemical formation of carbon allotropes (fullerenes, carbon nanotubes, carbon onion structures, etc. ), which is known to be catalyzed by iron and iron alloys ( Zhang et al, 2011 ; Zhang et al, 2012 ; Zhang et al, 2014 ; Velasquez et al, 2016 ), can be sensitive to the choice of mill ( Güler and Evin, 2015 ), or the substitution of steel milling balls and jar for another material ( Surov, 2004 ). Interestingly, the substitution of steel for ZrO 2 seemed to have no significant effect on the mechanochemical synthesis of graphene oxide by neat ball milling of pristine graphite ( Mahmoud et al, 2018 ).…”

Continuous selective deoxygenation of palm oil for renewable diesel production over Ni catalysts supported on Al2O3and La2O3–Al2O3

“…9b). It is generally accepted in the literature that, in air rich environments, functional groups physically or chemically adsorbed onto carbon nanomaterials decompose below 200 C, amorphous carbon species combust at temperatures between 200-500 C, carbon nanobers (CNFs) and carbon nanotubes (CNTs) are burned between 500-600/ 650 C, and more graphitic structures such as graphite and graphene combust between 600/650-800 C. 80,81 For the Ni/Al catalyst, the peak around 210 C can likely be ascribed to atomic carbon deposits formed over metallic nickel (which is the most reactive carbon type to oxygen), while the shoulder around 475 C can be attributed to amorphous coke deposited close to the metal support interphase. 82 The largest oxidation peak, at around 635 C, can be linked to well dened-structured carbon, hard to be oxidized.…”