Optimizing the catalytic activity of flame‐spray‐pyrolyzed Pt/Fe2O3 catalyst toward CO oxidation: Effect of fluorination and reduction. Issue 4 (25th February 2021)

• Record Type: Journal Article
• Authors: Sarkodie, Bismark; Hu, Yanjie; Bi, Wei; Jiang, Jiechao; Li, Chunzhong
• Is Part Of: Nano select. Volume 2:Issue 4(2021)
• Page Start: 744
• Page End: 757
• Publication Date: 2021-02-25
• Subjects: flame spray pyrolysis -- fluorination -- hydroxyl group -- oxygen vacancies -- Pt/Fe2O3; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.5
• DOI: 10.1002/nano.202000211
• Languages: English
• ISSNs: 2688-4011

Abstract

Abstract: Comprehending the characteristics of nanocatalyst and the effect of pretreatment on its catalytic performance is of great importance in the field of catalysis. The present study probes the catalytic performance of fluorinated Pt/Fe2 O3 prepared by one step flame spray pyrolysis and the effect of pretreatment in CO oxidation. The characterization reveals that in‐situ fluorination of Pt/Fe2 O3 in high temperature flame process contributed to low temperature reducibility, improved dispersion abundant surface oxygen vacancies and reactive hydroxyl groups. It is noteworthy that the optimal catalytic performance was attained after reduction of fluorinated Pt/Fe2 O3 in 10% H2 at 200 °C (F‐Pt/Fe‐200). The abundant surface hydroxyl group and oxygen vacancies facilitated faster reaction. The in‐situ DRIFTS reveals the consumption of hydroxyl group in F‐Pt/Fe‐200 which contributed to the amelioration of CO oxidation. Aside the better stability of F‐Pt/Fe‐200, complete conversion of 2% and 4% CO was achieved at 150 °C and 200 °C, respectively, indicating the feasible utilization of flame‐made fluorinated Pt/Fe2 O3 . Conclusively, the fluorine formed a strong bond with Pt, which ameliorated oxidative and thermal stability. Abstract : Through in‐situ fluorination, abundant oxygen vacancies and rich surface hydroxyl radicals were embedded on Pt/Fe2 O3 prepared by high temperature flame spray pyrolysis technique towards an elevated CO oxidation. Precisely, among all pretreatment atmosphere, reduction of the fluorinated Pt/Fe2 O3 in hydrogen at 200 °C offered remarkably improved catalytic activity.