Selective catalytic reduction of NOx by CO (CO-SCR) over metal-supported nanoparticles dispersed on porous alumina

• Published in: Advanced powder technology : the international journal of the Society of Powder Technology, Japan Japan, 2020-01, Vol.31 (1), p.464-476
• Main Authors: Oton, Lais F., Oliveira, Alcineia C., de Araujo, Jesuina C.S., Araujo, Rinaldo S., de Sousa, Francisco F., Saraiva, Gilberto D., Lang, Rossano, Otubo, Larissa, Carlos da Silva Duarte, Gian, Campos, Adriana
• Format: Article
• Language: English
• Subjects: Al2O3; Catalysts; Nanoparticles; SCR; Support
• ISSN: 0921-8831; 1568-5527
• DOI: 10.1016/j.apt.2019.11.003

[Display omitted] •Selective catalytic reduction of nitrogen oxides e.g. NOx by CO.•Pt, Ni, Co, Fe or Ni nanoparticles dispersed on porous alumina.•Best performances obtained over NiPt/Al2O3 and Pt/Al2O3.•High NOx conversion in the presence of SO2 and H2O poisons for NiPt/Al2O3. The selective catalytic reduction of NOx by CO (CO-SCR) was investigated over metals supported on porous alumina. The Pt, Co, Fe and Ni nanoparticles were dispersed on the alumina and characterized by XRD, textural properties, FTIR spectroscopy, chemical analyses, Py adsorption followed by FTIR measurements, HRTEM and SEM-EDS. Among the solids studied, the Pt/Al2O3 and NiPt/Al2O3 catalysts exhibited improved performance due to the interaction and synergy between the Pt(Ni) nanoparticles and the support. In other words, the electron transfer facility between the PtOx(Ni) and chlorined Pt species on the support provided a more active solid in the CO-SCR reaction. The surface acidity of Lewis acid sites and the porous features of the Pt/Al2O3 and NiPt/Al2O3 catalysts also contributed significantly to the high performance of these materials in the NOx conversion. The Pt/Al2O3 and NiPt/Al2O3 catalysts were tolerant to the poisoning by SO2 and H2O and depicted a superior catalytic performance, compared to the other solids.