ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Effect of reduction and reaction conditions on the catalytic performance of Co–Ni/Al₂O₃ catalyst in CO hydrogenation: modeling of surface reaction rate

Ali Akbar Mirzaei, Mohammad Farahi, and Maryam Akbari

Department of Chemistry, Faculty of Sciences, University of Sistan and Baluchestan, Zahedan, Iran

E-mail: m.akbary@pgs.usb.ac.ir

Received: 30 July 2020  Accepted: 9 December 2020

Abstract:

The effect of reduction and reaction conditions on catalytic performance and surface reaction rate of Fischer–Tropsch synthesis over Co–Ni/Al₂O₃ catalyst was studied in a stainless steel fixed-bed micro-reactor. Experiments were done over a collection of different reduction and reaction conditions, including reduction temperature (250–450 °C), reduction time (2–10 h), reducing agent (H₂, CO and mixing of H₂ and CO), reaction temperature (150–240 °C), H₂/CO (1–4) and reaction pressure (1–5 bar). In particular, the modeling of the effect of reduction and reaction conditions on the CO consumption rate was studied by response surface methodology. The surface reaction rates are important in scale-up of a FT reactor, industrial design, and simulation. The accuracy of created models was proved by ANOVA and diagnostic plots. According to the obtained quadratic polynomial equations, the order of parameters influence on CO consumption rate response was argued. Regard to results obtained, the main effective reduction and reaction parameters on CO consumption rate were reducing agent and reaction pressure, respectively. Furthermore, the precursor and catalysts before and after the test were characterized by XRD and SEM.

Keywords: Fischer–Tropsch synthesis; Cobalt–nickel catalyst; Surface reaction rate; Modeling; Response surface methodology

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-020-01469-8

Chemical Papers 75 (5) 2087–2103 (2021)