570. The formation of aromatic hydrocarbons at high temperatures. Part VIII. The pyrolysis of acetylene

Abstract

The pyrolysis of acetylene a t 700" yields a number of polycyclic aromatic hydrocarbons (including 3,4-benzopyrene) in addition to benzene and simple benzene derivatives.

Effects of reactor pressure and inlet temperature on n‐butane/dimethyl ether oxidation and the formation pathways of the aromatic species

“…Published works have shown that some minor oxidation products are associated with the formation of aromatic compounds and PAHs [21][22][23][24][25][26][27][28][29][30][31]. Among these species, the mole fractions of C 2 H 2 , C 3 H 3 , C 4 H 2 , C 4 H 4 , and c-C 5 H 6 were investigated in this study.…”

“…Formation pathways of the smaller aromatics and larger PAHs, and the contributing precursor species are not completely understood in oxidation and combustion processes. There are various species that contributed to the formations of the aromatics and PAHs in the literature [21][22][23][24][25][26][27][28][29][30][31]. For the oxidation of n-butane/DME mixture, the roles of the precursor species and the dominant pathways were tried to be clarified in this study.…”

“…The role of C 2 H 2 in the formations of larger aromatics and PAHs was explained by H-abstraction/C 2 H 2 -addition mechanism [23,24]. C 2 H 2 was also suggested to participate in the initial formation of C 6 H 6 around 1000 K [23,25]; and to contribute by the reaction C 4 H 5 1 C 2 H 2 !C 6 H 6 1 H [21]. However, our analysis showed that the role of C 2 H 2 in the formation of larger aromatics should be much more dominant than its role in C 6 H 6 formation around 1100 K.…”

Cyclotrimerization of Acetylene on Clusters Con+/Fen+/Nin+(n = 1–16)

“…However, the low yields and byproducts of aromatic derivatives may impede industrial applications of these reactions. Although the reaction of acetylene to benzene is exothermic, relatively high temperatures (above typically 400 °C) are currently used to overcome the energy barrier for partial activation of the CC bond to form the benzene ring. − On this background, extensive experimental and theoretical studies have been conducted on transition metal atoms and ions, − oxides, − complexes, − and supported metal catalysts (Pd n /MgO, Rh/MgO, Ag/MgO, Ni/SiO 2 ) − for the purpose of identifying for efficient catalysts for this cyclotrimerization.…”

Theoretical investigation on acetylene cyclotrimerization catalysed by TiO2 and Ti

“…In 1866, Berthelot et al pioneered the thermal cyclization of three acetylene molecules to generate benzene . However, the synthesis and conversion of such reactions are highly exothermic, and the reaction rate is meagre even at a high temperature . Since then, this methodology, with its very high rate under favourable reaction conditions, has attracted the interest of many researchers …”