Carbonaceous deposits on alumina as catalysts and supports

Modification of activated carbon with different agents and catalytic performance of products obtained in the process of ethylbenzene dehydrogenation coupled with nitrobenzene hydrogenation

“…According to Fiedorow et al [29], the contribution of particular reagents in formation of the carbonaceous deposit formed on the surface of alumina decreases in the Fig. 7.…”

“…sequence nitrobenzene > aniline > styrene > ethylbenzene. Moreover, the same authors established that in the ODE-N reaction the highest catalytic activity was shown by carbonaceous deposit of nitrobenzene origin, followed by that derived from aniline and styrene, whereas the activity of coke obtained from ethylbenzene was low [29].…”

“…A comparison of final yields of styrene and aniline leads to a conclusion that they are lower for aniline, which is well visible for all samples. Most probably it is related to the fact that decomposition of aniline has a greater contribution to the formation of the carbonaceous deposit [29]. That is why this deposit shows enhanced nitrogen content (Table 2).…”

The influence of texture of activated carbons on their catalytic activity in the process of ethylbenzene dehydrogenation coupled with nitrobenzene hydrogenation

“…The discovery that the real catalyst of the reaction is the carbon deposit forming in the process [15,16] has prompted great interest in carbon catalysts, including activated carbon [17][18][19]. The attractiveness of carbon catalysts is related to their easy availability, low price of precursors used for obtaining carbon catalysts and facility of their modification to get specific textural and chemical properties [20].…”

Chemically Modified Activated Carbons as Catalysts of Oxidative Dehydrogenation of n-Butane

“…The catalysts most often studied were vanadium or molybdenum-containing ones which showed high activity for this reaction [3][4][5][6][7]. However, as proved by the study of the oxidative dehydrogenation of ethylbenzene to styrene, the real catalyst of this reaction is the carbonaceous deposit forming in situ on the surface of the inorganic system [8][9][10]. Similar conclusions were reached by Maldonado-Hódar et al, who studied ODH of * corresponding author; e-mail: mkozlow@amu.edu.pl n-butane over the Ni-Mo-O catalyst [11].…”