A Promising Catalyst for the Dehydrogenation of Perhydro-Dibenzyltoluene: Pt/Al2O3 Prepared by Supercritical CO2 Deposition

Autor: Phillimon Modisha, Rudaviro Garidzirai, Hande Güneş, Selmi Erim Bozbag, Sarshad Rommel, Erdal Uzunlar, Mark Aindow, Can Erkey, Dmitri Bessarabov
Přispěvatelé: Erkey, Can (ORCID 0000-0001-6539-7748 & YÖK ID 29633), Bozbağ, Selmi Erim, Güneş, Hande, Modisha P., Garidzirai R., Güneş H., Bozbag S.E., Rommel S., Uzunlar E., Aindow M., Erkey C., Bessarabov D., Koç University Tüpraş Energy Center (KUTEM) / Koç Üniversitesi Tüpraş Enerji Merkezi (KÜTEM), College of Engineering, Department of Chemical and Biological Engineering, Modisha, Phillimon, Garidzirai, Rudaviro, Rommel, Sarshad, Uzunlar, Erdal, Aindow, Mark, Bessarabov, Dmitri
Rok vydání: 2022
Předmět:
Zdroj: Catalysts
Catalysts; Volume 12; Issue 5; Pages: 489
ISSN: 2073-4344
DOI: 10.3390/catal12050489
Popis: Pt/Al2O3 catalysts prepared via supercritical deposition (SCD), with supercritical CO2, wet impregnation (WI) methods and a selected benchmark catalyst, were evaluated for the dehydrogenation of perhydro-dibenzyltoluene (H18-DBT) at 300 degrees C in a batch reactor. After ten dehydrogenation runs, the average performance of the catalyst prepared using SCD was the highest compared to the benchmark and WI-prepared catalysts. The pre-treatment of the catalysts with the product (dibenzyltoluene) indicated that the deactivation observed is mainly due to the adsorbed H0-DBT blocking the active sites for the reactant (H18-DBT). Furthermore, the SCD method afforded a catalyst with a higher dispersion of smaller sized Pt particles, thus improving catalytic performance towards the dehydrogenation of H18-DBT. The particle diameters of the SCD- and WI-prepared catalysts varied in the ranges of 0.6-2.2 nm and 0.8-3.4 nm and had average particle sizes of 1.1 nm and 1.7 nm, respectively. Energy dispersive X-ray spectroscopy analysis of the catalysts after ten dehydrogenation runs revealed the presence of carbon. In this study, improved catalyst performance led to the production of more liquid-based by-products and carbon material compared to catalysts with low catalytic performance.
Financial support from the DSI HySA Infrastructure Centre of Competence through a KP5 grant, and the NRF grant 119004 are gratefully acknowledged.
Databáze: OpenAIRE
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