Ni/CNT/Zeolite-Y composite catalyst for efficient heptane hydrocracking: Steady-state and transient kinetic studies

Roba Saab; Constantinos M. Damaskinos; Kyriaki Polychronopoulou; Angelos M. Efstathiou; Nikolaos Charisiou; Maria Goula; Steven J. Hinder; Mark A. Baker; Andreas Schiffer

doi:10.1016/j.apcata.2021.118437

Ni/CNT/Zeolite-Y composite catalyst for efficient heptane hydrocracking: Steady-state and transient kinetic studies

Roba Saab
, Constantinos M. Damaskinos
, Kyriaki Polychronopoulou
, Angelos M. Efstathiou
, Nikolaos Charisiou
, Maria Goula
, Steven J. Hinder
, Mark A. Baker
, Andreas Schiffer

Mechanical & Nuclear Engineering

University of Cyprus
Western Macedonia University of Applied Sciences
University of Surrey

Research output: Contribution to journal › Article › peer-review

10 Scopus citations

Abstract

The effect of integrating carbon nanotubes (CNTs) into a bi-functional Ni-Zeolite-Y catalyst was studied for the hydrocracking of heptane at 350 and 400 °C (total pressure of 5 bar). It was shown that the growth of CNTs on the surface of Ni-Zeolite-Y (Ni-ZY) results in enhanced stability and catalytic activity (conversion increased by 22% at 350 °C) compared to the conventional Ni-ZY. A significant increase in the initial transient kinetic rates of CH₄ and C₂H₆ formation was also noticed. The CNT/Ni-ZY also showed reduced coke formation during the reaction as entailed by transient isothermal (400 °C) oxidation experiments. The formation of a crystalline Ni_xC_y phase on the zeolite surface was observed in the case of CNT/Ni-ZY, potentially responsible for its enhanced catalytic performance. This work demonstrates that the integration of CNTs in hydrocracking catalysts offers new opportunities for enhancing their catalytic activity, selectivity and coking resistance.

Original language	British English
Article number	118437
Journal	Applied Catalysis A: General
Volume	630
DOIs	https://doi.org/10.1016/j.apcata.2021.118437
State	Published - 25 Jan 2022

Keywords

Bi-functional catalyst
Carbon nanotubes
Hydroprocessing
Surface acidity
Transient kinetics

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title = "Ni/CNT/Zeolite-Y composite catalyst for efficient heptane hydrocracking: Steady-state and transient kinetic studies",

abstract = "The effect of integrating carbon nanotubes (CNTs) into a bi-functional Ni-Zeolite-Y catalyst was studied for the hydrocracking of heptane at 350 and 400 °C (total pressure of 5 bar). It was shown that the growth of CNTs on the surface of Ni-Zeolite-Y (Ni-ZY) results in enhanced stability and catalytic activity (conversion increased by 22\% at 350 °C) compared to the conventional Ni-ZY. A significant increase in the initial transient kinetic rates of CH4 and C2H6 formation was also noticed. The CNT/Ni-ZY also showed reduced coke formation during the reaction as entailed by transient isothermal (400 °C) oxidation experiments. The formation of a crystalline NixCy phase on the zeolite surface was observed in the case of CNT/Ni-ZY, potentially responsible for its enhanced catalytic performance. This work demonstrates that the integration of CNTs in hydrocracking catalysts offers new opportunities for enhancing their catalytic activity, selectivity and coking resistance.",

keywords = "Bi-functional catalyst, Carbon nanotubes, Hydroprocessing, Surface acidity, Transient kinetics",

author = "Roba Saab and Damaskinos, \{Constantinos M.\} and Kyriaki Polychronopoulou and Efstathiou, \{Angelos M.\} and Nikolaos Charisiou and Maria Goula and Hinder, \{Steven J.\} and Baker, \{Mark A.\} and Andreas Schiffer",

note = "Funding Information: The authors gratefully appreciate the financial support from the Abu Dhabi Department of Education and Knowledge (ADEK), United Arab Emirates through the Award for Research Excellence (AARE) 2017 (grant number AARE17-270 ), and the Research Committee of the University of Cyprus , Cyprus. This publication is partially based upon work supported by the Khalifa University of Science and Technology , United Arab Emirates (grant number RC2-2018-024 ). Funding Information: The authors gratefully appreciate the financial support from the Abu Dhabi Department of Education and Knowledge (ADEK), United Arab Emirates through the Award for Research Excellence (AARE) 2017 (grant number AARE17-270), and the Research Committee of the University of Cyprus, Cyprus. This publication is partially based upon work supported by the Khalifa University of Science and Technology, United Arab Emirates (grant number RC2-2018-024). Publisher Copyright: {\textcopyright} 2021 Elsevier B.V.",

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doi = "10.1016/j.apcata.2021.118437",

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T1 - Ni/CNT/Zeolite-Y composite catalyst for efficient heptane hydrocracking

T2 - Steady-state and transient kinetic studies

AU - Saab, Roba

AU - Damaskinos, Constantinos M.

AU - Polychronopoulou, Kyriaki

AU - Efstathiou, Angelos M.

AU - Charisiou, Nikolaos

AU - Goula, Maria

AU - Hinder, Steven J.

AU - Baker, Mark A.

AU - Schiffer, Andreas

N1 - Funding Information: The authors gratefully appreciate the financial support from the Abu Dhabi Department of Education and Knowledge (ADEK), United Arab Emirates through the Award for Research Excellence (AARE) 2017 (grant number AARE17-270 ), and the Research Committee of the University of Cyprus , Cyprus. This publication is partially based upon work supported by the Khalifa University of Science and Technology , United Arab Emirates (grant number RC2-2018-024 ). Funding Information: The authors gratefully appreciate the financial support from the Abu Dhabi Department of Education and Knowledge (ADEK), United Arab Emirates through the Award for Research Excellence (AARE) 2017 (grant number AARE17-270), and the Research Committee of the University of Cyprus, Cyprus. This publication is partially based upon work supported by the Khalifa University of Science and Technology, United Arab Emirates (grant number RC2-2018-024). Publisher Copyright: © 2021 Elsevier B.V.

PY - 2022/1/25

Y1 - 2022/1/25

N2 - The effect of integrating carbon nanotubes (CNTs) into a bi-functional Ni-Zeolite-Y catalyst was studied for the hydrocracking of heptane at 350 and 400 °C (total pressure of 5 bar). It was shown that the growth of CNTs on the surface of Ni-Zeolite-Y (Ni-ZY) results in enhanced stability and catalytic activity (conversion increased by 22% at 350 °C) compared to the conventional Ni-ZY. A significant increase in the initial transient kinetic rates of CH4 and C2H6 formation was also noticed. The CNT/Ni-ZY also showed reduced coke formation during the reaction as entailed by transient isothermal (400 °C) oxidation experiments. The formation of a crystalline NixCy phase on the zeolite surface was observed in the case of CNT/Ni-ZY, potentially responsible for its enhanced catalytic performance. This work demonstrates that the integration of CNTs in hydrocracking catalysts offers new opportunities for enhancing their catalytic activity, selectivity and coking resistance.

AB - The effect of integrating carbon nanotubes (CNTs) into a bi-functional Ni-Zeolite-Y catalyst was studied for the hydrocracking of heptane at 350 and 400 °C (total pressure of 5 bar). It was shown that the growth of CNTs on the surface of Ni-Zeolite-Y (Ni-ZY) results in enhanced stability and catalytic activity (conversion increased by 22% at 350 °C) compared to the conventional Ni-ZY. A significant increase in the initial transient kinetic rates of CH4 and C2H6 formation was also noticed. The CNT/Ni-ZY also showed reduced coke formation during the reaction as entailed by transient isothermal (400 °C) oxidation experiments. The formation of a crystalline NixCy phase on the zeolite surface was observed in the case of CNT/Ni-ZY, potentially responsible for its enhanced catalytic performance. This work demonstrates that the integration of CNTs in hydrocracking catalysts offers new opportunities for enhancing their catalytic activity, selectivity and coking resistance.

KW - Bi-functional catalyst

KW - Carbon nanotubes

KW - Hydroprocessing

KW - Surface acidity

KW - Transient kinetics

UR - https://www.scopus.com/pages/publications/85120170265

U2 - 10.1016/j.apcata.2021.118437

DO - 10.1016/j.apcata.2021.118437

M3 - Article

AN - SCOPUS:85120170265

SN - 0926-860X

VL - 630

JO - Applied Catalysis A: General

JF - Applied Catalysis A: General

M1 - 118437

ER -

Ni/CNT/Zeolite-Y composite catalyst for efficient heptane hydrocracking: Steady-state and transient kinetic studies

Abstract

Keywords

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