Activity of Catalytic Ceramic Papers to Remove Soot Particles—A Study of Different Types of Soot

LEONARDI, SABRINA ANTONELA; MIRÓ, EDUARDO ERNESTO; MILT, VIVIANA GUADALUPE

Catalysts

MDPI

Año: 2022 vol. 12

Diesel soot particles are of concern for both the environment and health. To catalyticallyremove them, it is important to know their structure and composition. There is little describedin the literature on how catalysts favor the combustion of different soot fractions. In this work,programmed temperature oxidation (TPO) experiments were carried out using Co,Ce or Co,Ba,Kcatalysts supported on ceramic papers. Soot particles were obtained by burning diesel fuel in a vessel(LabSoot) or by filtering exhaust gases from a turbo diesel engine in a DPF filter (BenchSoot), andcompared with a commercial diesel soot: Printex U. Various characterization techniques were usefulto relate the characteristics of both the soot particles and the catalysts with the TPO results. Themaximum catalytic soot burn rate (TM) temperatures were in the range of diesel exhaust temperaturesthat would facilitate in-situ regeneration of the DPF. The Co,Ba,K catalyst showed a higher catalyticeffect in LabSoot, as the latter exhibited the largest primary particles and the higher order of graphenelayers, for which the potassium-containing catalyst improves the contact between soot and catalystand favors the combustion of soot, while the Co,Ce catalyst preferentially enhanced the combustionof commercial soot by supplying active oxygen.