Hydrogen Release from Decalin by Catalytic Dehydrogenation over Supported Platinum Catalysts

Martynenko, E. A.; Savinov, A. A.; Verevkin, Sergey P.; Pimerzin, Aleksey A.

doi:10.1007/s11244-020-01228-9

Cited by 26 publications

(9 citation statements)

References 24 publications

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“…According to the literature, Pt-reduced catalysts favor the selectivity of 2-propanol decomposition towards dehydrogenation (Rioux and Vannice, 2005;Martynenko et al, 2020). The results of this work are in agreement with the literature, since reduced catalysts presented two competitive reactions: dehydration, thus forming propene and water; and dehydrogenation, which produces acetone and hydrogen.…”

Section: -Propanol Decompositionsupporting

confidence: 90%

2-Propanol dehydration and dehydrogenation on Pt/Al2O3 and Pt/Al2O3-CeO2 catalysts

Pérez-Pastenes

Núñez-Correa²,

Pérez-López³

et al. 2021

RMIQ

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Section: -Propanol Decompositionsupporting

confidence: 90%

2-Propanol dehydration and dehydrogenation on Pt/Al2O3 and Pt/Al2O3-CeO2 catalysts

Pérez-Pastenes

Núñez-Correa²,

Pérez-López³

et al. 2021

RMIQ

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“…The lower E a (HDO) observed with Pd/MgO can be explained by the strong basic nature of the support, which was shown to help activate the guaiacol molecule [44] . On the other hand, the dehydrogenation of cyclic alkanes has been shown to be more active over γ‐Al 2 O 3 than MgO and SiO 2 [49,50] . This prominent difference in value between the E a for bicyclohexyl dehydrogenation highlights the impact of the support on the dehydrogenation step, which ultimately affects the CTH reaction.…”

Section: Resultsmentioning

confidence: 99%

“…Additionally, the high activity for bicyclohexyl dehydrogenation of the Pd/γ‐Al 2 O 3 indicates that the reaction is controlled by kinetics (lower activation energy), in particular when compared to Pd/SiO 2 and Pd/MgO. Indeed, published results show that γ‐Al 2 O 3 is one of the most effective support materials for dehydrogenation of cycloalkanes [49,50] …”

Section: Resultsmentioning

confidence: 99%

Role of Catalyst Support's Physicochemical Properties on Catalytic Transfer Hydrogenation over Palladium Catalysts

et al. 2021

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Catalytic transfer hydrogenation (CTH) is a promising reaction for valorisation of bio‐based feedstocks via hydrogenation without needing to use H2. Unlike standard hydrogenation, CTH occurs via dehydrogenation (DHD) of a hydrogen donor (H‐donor) and hydrogenation (HYD) of a substrate. Therefore, the “ideal” CTH catalyst must balance the catalysis of both reactions to maximize the hydrogen transfer between H‐donor and substrate with minimal H2 loss to gas (high atom efficiency). Additionally, the H‐donor must be highly stable to prevent secondary reactions with the substrate. Herein we study the impact of the catalyst's properties on CTH of guaiacol using bicyclohexyl, a liquid organic hydrogen carrier, as a H‐donor. The reaction was promoted by palladium dispersed on three typical support materials (γ‐Al2O3, MgO, and SiO2). The performance of these catalysts in the conversion of bicyclohexyl and guaiacol was evaluated, allowing to estimate the H‐transfer efficiency, as well as the potential for recycling the spent H‐donor (bicyclohexyl). The apparent activation energies for DHD of bicyclohexyl and HYD of guaiacol revealed that slow DHD combined with fast HYD, as is the case with Pd/MgO, favours hydrogen transfer efficiency and selectivity towards hydrogenated products. In addition, an investigation of the DHD of bicyclohexyl and HYD of guaiacol independently showed that the affinity between the organic molecules and the support significantly impacts CTH. Indeed, Pd/SiO2 was highly active for both reactions individually and almost inactive for CTH. Consequently, these findings highlight the importance of the interaction between solvent‐substrate‐support in designing catalysts for transfer hydrogenation.

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“…However, thermal cracking and polyaddition reactions are also increased at high temperatures. 34 The yield of reaction gases, such as light hydrocarbons (C 1 − C 4 ), H 2 S, CO 2 , and hydrogen, allows for evaluating the heavy crude oil upgrading performance and the donation of hydrogen by decalin. For experiments in the presence of decalin in the reaction system at 300 °C and 24 h, the yield of H 2 was increased up to 0.187 wt % compared with 0.0034 wt % for experiments without a hydrogen donor.…”

Section: Resultsmentioning

confidence: 99%

“…This behavior is intensified with the temperature rise since decalin dehydrogenation is an endothermic reaction. However, thermal cracking and polyaddition reactions are also increased at high temperatures …”

Section: Resultsmentioning

confidence: 99%

Kinetics of Non-Catalytic Aquathermolysis of Heavy Crude Oil in the Presence of a Hydrogen Donor

Tirado,

Félix,

Al-Muntaser

et al. 2024

Ind. Eng. Chem. Res.

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The research for increasing the performance of novel technologies for the production and upgrading of heavy crude oil reserves through the development and selection of adequate catalyst precursors and hydrogen donors has been raised to address the growing energy demand. Studies based on complex kinetic models are required to achieve a better understanding of the effect of hydrogen donors and their reaction mechanisms for the aquathermolysis of heavy crude oil. In this study, the kinetic effect of decalin as a hydrogen donor on aquathermolysis of heavy crude oil was analyzed under a temperature range of 250−300 °C, a water/oil ratio of 3:7, and reaction periods of up to 72 h. A fivelump kinetic model was developed to study the reaction behavior of the SARA fractions and gas production, where the calculated kinetic parameters provided an adequate agreement with average absolute error values lower than 5% concerning experimental data. The model results indicated that in experiments in the presence of decalin, the conversion of asphaltenes presents a higher selectivity toward resins and aromatic compounds. On the other hand, the formation of secondary asphaltenes produced from resins is inhibited, showing an improvement in the selectivity of aromatic compounds from this fraction.

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Hydrogen Release from Decalin by Catalytic Dehydrogenation over Supported Platinum Catalysts

Cited by 26 publications

References 24 publications

2-Propanol dehydration and dehydrogenation on Pt/Al2O3 and Pt/Al2O3-CeO2 catalysts

2-Propanol dehydration and dehydrogenation on Pt/Al2O3 and Pt/Al2O3-CeO2 catalysts

Role of Catalyst Support's Physicochemical Properties on Catalytic Transfer Hydrogenation over Palladium Catalysts

Kinetics of Non-Catalytic Aquathermolysis of Heavy Crude Oil in the Presence of a Hydrogen Donor

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