Effect of citric acid-ethylene glycol binders on the washcoat adhesion and activity of monolithic catalysts for the catalytic oxidation of dichloromethane
Year: 2024
Type: article
Abstract: Supported Pt-Co/HZSM-5 catalyst was considered to have excellent activity and stability in the catalytic combustion of chlorinated VOCs, which face challenges in scale-up application. Herein, we used an organic binder (citric acid-ethylene glycol, denoted as CA-EG) to coat the catalyst slurry on honeycomb cordierite. Citric acid can help to synthesize a stable slurry and preserve the activity of the original catalyst powder compared to traditional binders (Al or Si gel). Catalyst characterization shows that the catalysts using CA-EG as the binder had enhanced redox properties, richer surface adsorbed oxygen and a more complete pore structure. This resulted in catalysts with lower T90 and lower by-product yields. The monolithic Pt-Co/HZSM-5 catalyst exhibited excellent activity in the oxidation of dichloromethane (T50=246.9 ºC and T90=334.1 ºC), and showed stability for at least 48 hours (at 90% conversion with no noticeable drop). Moreover, the water resistance of the monolithic catalyst was also excellent. This study proved that the CA-EG binder is very suitable for the coating process of zeolite-based catalysts.
Source: Applied Surface Science
Institution: Tianjin University
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,820
OpenAlex ID: W4404768981