Exploring the feasibility of continuous CWAO of bisphenol A at near-ambient temperature and pressure through use of hydrophobic Pt catalysts

Saunders, Korrin, Golunski, Stanislaw ORCID: https://orcid.org/0000-0001-7980-8624, Taylor, Stuart H. ORCID: https://orcid.org/0000-0002-1933-4874, Plucinski, Pawel, Pintar, Albin and Zerjav, Gregor 2024. Exploring the feasibility of continuous CWAO of bisphenol A at near-ambient temperature and pressure through use of hydrophobic Pt catalysts. Applied Catalysis A: General 676 , 119637. 10.1016/j.apcata.2024.119637

Preview

PDF - Published Version Available under License Creative Commons Attribution. Download (700kB) | Preview

Abstract

Hydrophobic Pt CWAO-catalysts can achieve complete removal of bisphenol A from a flow of contaminated water in a trickle-bed reactor at an operating temperature of 120°C, total air pressure of 8 bar and a liquid-hourly space velocity of 26.6 h−1. Although increasing the throughput of contaminated water while lowering the operating temperature results in bisphenol A conversions below 100%, these more demanding conditions allow structurally similar catalyst formulations to be differentiated from one another. At 60°C and 8 bar total pressure of air, 2%Pt supported on a SiC-TiC composite material has the highest initial activity from a group of three hydrophobic catalysts with similar surface areas and Pt particle diameters, but it begins to deactivate progressively after 15 hours on stream. This catalyst contains some localised hydrophilicity arising from the presence of surface TiO2, which forms when the exposed TiC component of the support material oxidises during catalyst preparation. At 80 °C and ambient air pressure, the activity is lower but there are no signs of deactivation during 24 hours on stream. The results are consistent with metallic platinum providing the active sites for CWAO of bisphenol A, with oxygen being directly activated from the gas phase at elevated pressures, but with dissolved oxygen also contributing to the reaction particularly at ambient air pressure. Continuous and irreversible deactivation, which occurs at air pressures ≥4 bar, appears to be associated with high occupancy of the active sites by adsorbed oxygen, resulting in leaching of platinum into the aqueous phase.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Chemistry Cardiff Catalysis Institute (CCI)
Publisher:	Elsevier
ISSN:	0926-860X
Funders:	EPSRC
Date of First Compliant Deposit:	20 March 2024
Date of Acceptance:	21 February 2024
Last Modified:	17 Apr 2024 13:20
URI:	https://orca.cardiff.ac.uk/id/eprint/167400

Actions (repository staff only)

Edit Item