Multi-walled carbon nanotubes (MWNTs) as an efficient catalyst for catalytic wet air oxidation of phenol

Catalytic performance of carbon nanotubes in H2O2 decomposition: Experimental and quantum chemical study

“…Besides serving as a support, CNTs alone can be used as catalysts for some specific reactions, including methane and NO x decomposition [3,4], oxidative dehydrogenization of aromatic hydrocarbons and alkanes [5,6,7,8,9], oxidation of aniline [10], p-toluidine [11], and benzyl alcohol [12], catalytic wet air oxidation of phenol [13,14] and pcoumaric acid [15,16], aerobic oxidation of cyclohexane [17,18], ozonation of oxalic acid [19,20], selective oxidation of H 2 S [21], and heterogeneous hydroxylation of organics [22]. Nitrogen-doped CNTs were used as basic catalyst in Knoevenagel condensation [23] and CO oxidation [24] reactions.…”

Tuning CNT Properties for Metal-Free Environmental Catalytic Applications

“…Some other publications [71,72,80] have claimed that the carboxylic acid groups attached to the surface of CNTs promote their catalytic activity for the oxidation of phenol by the CWAO process. To clarify the controversy in the literature regarding the active sites of CNTs (i.e., sites of basic or acidic nature) required to achieve the best performance in CWAO, CNTs samples obtained by the oxidation of CNTs with HNO 3 , followed by thermal treatments for the selective removal of O-containing groups used in ref.…”

“…Although this is well accepted in literature for COZ, in the case of CWAO there is a controversy regarding the active sites on carbon nanotubes (i.e., sites of basic or acidic nature) required to achieve the best performance. The catalytic activity of nanocarbons successfully functionalized with different heteroatoms has been investigated in CWAO [31,38,52,56,[70][71][72][73] and in COZ [26,51,56,[67][68][69][74][75][76][77][78] by several authors. O-, N-and S-doped CNTs have been studied as catalysts in both processes.…”

Visible light photocatalytic properties of novel molybdenum treated carbon nanotube/titania composites

“…Recently, carbon supported catalysts have attracted increasing attention (Farag et al 1999;Li et al 2001;Fu et al 2004;Oh et al 2007;Yang et al 2007;Oh and Chen 2008;Zhang et al 2008Zhang et al , 2009. Carbon nanotubes (CNTs) are a type of novel carbon material with unique mechanical and electronic properties (Dai et al 1996;Zhang et al 1999), which can be regarded as hollow graphite fibre with a perfect structure, such as seamless tube-like graphitic walls consisting of sp 2 carbon-carbon atoms, nano-sized hollow channels, excellent electron-transporting capability as well as convertible surface properties that can be modified easily.…”