Initiation behaviour in hydrogenation of pyrolysis gasoline over presulphided Ni-Mo-Zn/Al2O3 catalyst

Zi-Xia Li; Wei Sun; Shun-Qin Liang; Huan-Ling Song

doi:10.1515/chempap-2016-0013

Article

Initiation behaviour in hydrogenation of pyrolysis gasoline over presulphided Ni-Mo-Zn/Al₂O₃ catalyst

Zi-Xia Li , Wei Sun , Shun-Qin Liang and Huan-Ling Song

Published/Copyright: February 11, 2016

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From the journal Chemical Papers Volume 70 Issue 6

Abstract

A presulphided treatment was applied to the oxidic Ni-Mo-Zn/Al₂O₃ catalyst (nickel catalyst) in order to avoid thermal run-away during initiation of the hydrogenation of pyrolysis gasoline. The physico-chemical properties of the prepared oxidic nickel catalyst, the reduced and passivated (RP) nickel catalyst and the sulphided (RPS) nickel catalyst were characterised using N₂ adsorptiondesorption, X-ray diffraction, temperature-programmed reduction (TPR) and X-ray photoelectron spectroscopy (XPS). The TPR results showed that the reducibility of the RP Ni-Mo-Zn/Al₂O₃ catalyst was improved over the oxidic nickel catalyst. The XPS spectra confirmed the binding energy of the RPS nickel catalyst to be higher than that of the oxidic nickel catalyst. The catalytic performance was evaluated on a fixed-bed reactor (reaction temperature between 30 °C and 70°C, at 2.8 MPa of total pressure and weight hourly space velocity of 2.0 h^-1, the volume of H₂/pyrogasoline = 200 : 1). The rising temperature of the RPS nickel catalyst was almost 20 °C lower than that of the oxidic nickel catalyst during the initial stage of the hydrogenation reaction. The results indicated that the RPS nickel catalyst exhibited better stability than the oxidic nickel catalyst during the start-up period, thereby providing a better selectivity in long- term operation.

Keywords: nickel catalyst; presulphided; pyrolysis gasoline; reduction and passivation; selective hydrogenation

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Received: 2015-7-19

Revised: 2015-10-31

Accepted: 2015-11-25

Published Online: 2016-2-11

Published in Print: 2016-6-1

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Articles in the same Issue

https://doi.org/10.1515/chempap-2016-0013

Keywords for this article

nickel catalyst; presulphided; pyrolysis gasoline; reduction and passivation; selective hydrogenation