Stability Optimization of Iron-Based Catalysts: Application of Cr-Enriched Alloy Steel Catalyst in Ozonation Pharmaceutical Wastewater

Published: Jan. 1, 2024

Catalytic ozonation for advanced treatment of industrial wastewater has proved to be effective, and the stability catalyst is crucial long-term application process in practical engineering. In this study, electrochemical characteristics four iron shavings: alloy steels (38CrMoAl 40Cr) carbon (A3 45#) were investigated, a new citric acid-optimized H2O2 modification method was proposed. The low open circuit potential (OCP) indicated that they have higher reactivity require shorter times. OCP steels, more concentration required enhance efficiency. By adding acid, rapid steel achieved, catalysts exhibited lower passivation current (Ip), indicating rate substrate loss longer lifetime catalysts. Furthermore, Cr enrichment occurred oxide layer Cr/Fe (atomic ratio) 38CrMoAl 40Cr increased from 0.018 0.040 0.010 0.037, respectively. presence CrOOH Cr2O3 within reinforce layer's overall structural integrity its protection internal substrate, making resistant adapt high-salinity wastewater. Through laboratory tests, it found among catalysts, showed highest good catalytic activity with concentration. Therefore, pilot-scale effect evaluated. pharmaceutical wastewater, Chemical oxygen demand (COD) total organic (TOC) removal 56.3% 32.4%, These results can improved by optimizing selection steel, introduction acid achieved amplified advantage steel. research provides guidance raw materials preparation different industries treatment, especially high- salinity which realize stable catalyst.

Language: Английский

Operation of iron-based monolithic catalyst packing ozonation for industry wastewater advanced treatment: The importance of gas–liquid flow patterns and wastewater flow regimes

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: 494, P. 153117 - 153117

Published: June 13, 2024

Language: Английский