By Edward Furimsky
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Extra resources for Carbons and Carbon Supported Catalysts in Hydroprocessing
It is indeed observed that the coke deposition on carbon-supported catalysts is generally slower compared with that on the g-Al2O3-supported catalysts. The nonacidic surface of carbon support, ensuring little interaction with N-bases, may be another reason for the slower coke deposition. 93 catalyst and Al2O3 support was greater than the amount of hydrogen consumed by the same amount of catalyst. Thus, little hydrogen consumption occurred for the Al2O3 alone. Inevitably, the hydrogen in excess ended up on the support, most likely in the form of OH groups.
116 demonstrated that the amount of H2 desorbed from the Pd/AC catalyst prepared using such treatment was more than twice that prepared without this treatment. In this case, the H2 adsorption was conducted at 473 K in the ﬂow of 10% H2+N2 mixture. 117 using inelastic neutronscattering spectroscopy. One type of H atoms was located at the edge sites of graphite layer. The dissociative chemisorption of H2 (B500 K) resulted in the formation of weakly bonded mobile H atoms. The uptake of hydrogen and its spillover increased in the following order: Pt o Pd o Ru.
If present, CUS facilitated such interaction. The Mo–C bonds were also formed during the MoS2 decomposition in the presence of dimethylsulﬁde (DMS). Compared with freshly sulﬁded catalyst, the incorporation of carbon resulted in the reduction of the size of active-phase particles by a factor of two. The existence of Mo–S–C phase was observed by Rodriguez and coworkers74,75 while contacting Mo2S with S-containing compounds. These authors suggested that such species may participate during HDS reactions.
Carbons and Carbon Supported Catalysts in Hydroprocessing by Edward Furimsky