Work

Recovery of deactivated γ-Al2O3 catalyst used in chlorination of benzene by a hybrid method: Acid washing and thermal treatment

Year: 2025

Type: article

Abstract: This study implements a hybrid method to revive the deactivated γ-Al 2 O 3 catalyst used in the chlorination of waste-recycled benzene in vinyl chloride production by Arvand Petrochemical Company. The method includes chemical and thermal remedies: acid washing and heating under steam. The acidity strength of two different acids, HCl and HNO 3 , and furnace temperature are perceived as influential variables in the reviving process in three levels of 0.5, 1, and 1.5 M, and 450, 500, and 550°C. Characterization analyses including XRD, BET, SEM, and FTIR are employed to compare fresh, deactivated, and revived catalysts. The results suggested that HCl with a concentration of 0.5 M and a furnace temperature of 500 °C triggered the optimal conditions to recover the specific surface area. It is proven that HNO 3 even in the lowest concentration could destroy the catalyst structure. On the contrary, thermal treatment was insufficient to revive the deactivated catalyst.

Source: Results in Materials

DOI: 10.1016/j.rinma.2025.100675

Authors: Sh. Fallahi, M. Kord, M. Hajilari, A. Heidary Moghadam, T. Pirhoushyaran

Institutions: Islamic Azad University, Dezful Branch, Research Institute of Petroleum Industry

Language: English

Topic: Zeolite Catalysis and Synthesis

Subfield: Inorganic Chemistry

Field: Chemistry

Domain: Physical Sciences

SDG: Responsible consumption and production

Open Access status: gold

Estimated APC paid: $1,530