Coke formation on H-mordenite catalyst during the benzene transalkylation with C9+ aromatics

Domingues, Suzana Marques; Britto, Jaildes Marques; Oliveira, Áureo Silva de; Valentini, Antoninho; Reyes, Patricio; David, Jorge; Rangel, M.C.

doi:10.1016/s0167-2991(01)80179-8

Cited by 3 publications

(1 citation statement)

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“…To further evaluate the use of such catalysts in a simple fixed-bed reactor, the possibility of carrying out multiple regeneration cycles is required to evaluate the performance of the catalyst under such conditions. Catalyst deactivation is costly and therefore, enhancing the catalyst stability or regain the catalytic activity of the catalyst while maintaining a simple reactor design becomes an essential task to enhance the profitability of the process [15,16].…”

Section: Introductionmentioning

confidence: 99%

Effect of hydrogenative regeneration on the activity of beta and Pt-Beta zeolites during the transalkylation of toluene with 1,2,4-trimethylbenzene

Almulla

Zholobenko

Tedstone

et al. 2020

Microporous and Mesoporous Materials

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Catalyst deactivation remains a main challenge in the transalkylation process. To develop a cost-effective and eco-friendly catalyst, improving the regeneration characteristics of Beta/Pt-Beta catalysts was investigated. The regeneration process was carried out using hydrogen and up to four cycles (30 hours on stream per cycle). A Pt-Beta catalyst with enhanced regeneration and activity characteristic relative to the parent materials is presented, and found to be stable, with the activity fully restored by regeneration with hydrogen at 500 o C. The activity of the parent Beta dropped gradually after each cycle suggesting that the hydrogen alone at 500 o C was insufficiently effective in removing coke precursors. The drop in activity was attributed to the disappearance of Brønsted acid sites over the spent Beta catalyst due to the growth of coke molecules trapped in cavities leading to highly polyaromatic molecules blocking those active sites. This limitation can be effectively overcome by platinum addition.

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Section: Introductionmentioning

confidence: 99%