Accelerated pre-coking of NiMo/Γ-Al2O3 catalyst: Effect on the hydroprocessing activity of vacuum residue

K. Kohli, R. Prajapati, Samir K. Maity, M. Sau, Brajendra Kumar Sharma

Research output: Contribution to journalArticle

Abstract

A pre-coking process for acceleration of hydrotreating catalyst deactivation is proposed in this work. An artificial pre-coked catalyst is synthesized by using methylnaphthalene as a coke precursor. During the pre-coking process, coke precursor got cracked into smaller aromatic hydrocarbons which penetrates into the pore cavity and covers the active sites. The carbon-coated catalyst has been characterized using N2-sorption isotherms, thermogravimetric analyser (TGA), X-ray electron microscopy (XPS), scanning electron microscopy (SEM), and high resolution-transmission electron microscopy (HR-TEM). The activity of the carbon-coated catalyst has been evaluated using vacuum residue as feed and results were compared with fresh catalyst. The findings indicate that proposed methodology is able to deactivate the catalyst effectively. It also indicates that proposed pre-coking process can predict the causes of catalyst deactivation in advance. Kinetic parameters of hydrodesulfurization (HDS) reactions are also estimated. The quality of the hydrotreated products at different reaction temperature is also studied. The amount of aromatic and resin are higher in the products obtained with carbon coated catalyst.

LanguageEnglish (US)
Pages437-447
Number of pages11
JournalFuel
Volume235
DOIs
StatePublished - Jan 1 2019

Fingerprint

Coking
Vacuum
Catalysts
Catalyst deactivation
Carbon
Coke
Aromatic Hydrocarbons
Hydrodesulfurization
Aromatic hydrocarbons
High resolution transmission electron microscopy
Kinetic parameters
Electron microscopy
Isotherms
Sorption
X ray photoelectron spectroscopy
Resins
X rays
Scanning electron microscopy

Keywords

  • Accelerated deactivation
  • Carbon coated catalyst
  • Hydrodesulfurization
  • Pre-coking process
  • Residue hydrocracking

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Organic Chemistry

Cite this

Accelerated pre-coking of NiMo/Γ-Al2O3 catalyst : Effect on the hydroprocessing activity of vacuum residue. / Kohli, K.; Prajapati, R.; Maity, Samir K.; Sau, M.; Sharma, Brajendra Kumar.

In: Fuel, Vol. 235, 01.01.2019, p. 437-447.

Research output: Contribution to journalArticle

Kohli, K. ; Prajapati, R. ; Maity, Samir K. ; Sau, M. ; Sharma, Brajendra Kumar. / Accelerated pre-coking of NiMo/Γ-Al2O3 catalyst : Effect on the hydroprocessing activity of vacuum residue. In: Fuel. 2019 ; Vol. 235. pp. 437-447.
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