Coke and deactivation II. Formation of coke and minor products in the catalytic cracking of n-Hexene on USHY zeolite
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Elucidation of active species and reaction mechanism of sulfide V-K/Al<inf>2</inf>O<inf>3</inf> catalyst for isobutane dehydrogenation
2021, Applied Surface ScienceCitation Excerpt :With regard to sample V-S-3.5 h, no obvious peak was shown in Fig. 9, implying that not too much coke deposited on the catalyst at the beginning of the reaction. As the DH reaction proceed, a well resolved resonance with chemical shift of ~ 132 ppm appeared for samples V-S-6 h and V-S-8.5 h, which is commonly attributed to polyaromatic carbonaceous species [51,52]. Besides, a small peak at ~ 28 ppm was observed, which is identified for aliphatic carbon species.
Production of renewable aromatics and olefins by catalytic co-cracking of fatty acid methyl esters and methanol
2021, Ranliao Huaxue Xuebao/Journal of Fuel Chemistry and TechnologyStudy of coke deposited on a VO<inf>x</inf>-K<inf>2</inf>O/Γ-Al<inf>2</inf>O<inf>3</inf> catalyst in the non-oxidative dehydrogenation of isobutane
2017, Applied Catalysis A: GeneralCitation Excerpt :Apart from the spinning sidebands, both V-1.5h and V-10h samples present a resonance centered at around 31 ppm, which is generally assigned to aliphatic carbon species, corresponding to −CH2 groups [26]. After 10 h on stream, the spectra changed gradually and the area for peak at 31 ppm decreased, whereas a peak at ∼132 ppm appeared, which is related to polyaromatic carbonaceous species [27,28]. It indicates that the aliphatic carbonaceous species constantly transformed into aromatic species as the DH reaction proceeded, leading to an increase for the aromaticity of the deposited coke.
Single-Event MicroKinetics for coke formation in catalytic cracking
2005, Catalysis TodayVanadium effect on HUSY zeolite deactivation during hydrothermal treatment and cyclohexane model reaction
2005, Applied Catalysis A: General