Self-Propagated Flaming Synthesis of Highly Active Layered CuO-δ-MnO2 Hybrid Composites for Catalytic Total Oxidation of Toluene Pollutant

Luming Li; Jingjie Luo; Yuefeng Liu; Fangli Jing; Dangsheng Su; Wei Chu

doi:10.1021/acsami.7b04380

Self-Propagated Flaming Synthesis of Highly Active Layered CuO-δ-MnO₂ Hybrid Composites for Catalytic Total Oxidation of Toluene Pollutant

ACS Appl Mater Interfaces. 2017 Jul 5;9(26):21798-21808. doi: 10.1021/acsami.7b04380. Epub 2017 Jun 23.

Authors

Luming Li¹, Jingjie Luo², Yuefeng Liu³, Fangli Jing¹, Dangsheng Su^{2

3}, Wei Chu¹

Affiliations

¹ School of Chemical Engineering, & Institute of New Energy and Low Carbon Technology, Sichuan University , Chengdu 610065, China.
² Shenyang National Laboratory for Materials Science (SYNL), Institute of Metal Research, Chinese Academy of Science , Shenyang 110016, China.
³ Dalian National Laboratory for Clean Energy (DNL), Dalian Institute of Chemical Physics, Chinese Academy of Sciences , Dalian 116023, China.

PMID: 28589715
DOI: 10.1021/acsami.7b04380

Abstract

A new self-propagated flaming (SPF) technique was applied to the synthesis of highly active layered CuO-δ-MnO₂ hybrid composites, for the de-polluting catalytic total oxidation of gaseous toluene vapor. Other transition metal oxide-doped MnO₂ hybrid composites were also successfully prepared and investigated, ensuring a feasible strategy for the fabrication of various layered MO_x-δ-MnO₂ (M═Co, Ni, or Zn) hybrids. By changing the molar ratio of the precursors (KMnO₄ and acetate salt) and the type of transition metal oxide introduced, it is possible to control the crystal structure and reducibility of the sheetlike hybrid composites as well as the catalytic activity for the total oxidation of toluene. The catalyst sample (CuO-δ-MnO₂) with a Mn/Cu molar ratio of 10:1 exhibited the highest catalytic performance, with a lower reaction temperature of 300 °C for complete toluene removal, which was comparable to the reaction temperature for total toluene conversion by the Pt-based catalyst. The SPF technique provides an approach for developing highly efficient catalysts for the complete removal of volatile organic compounds, by allowing the facile and energy-saving fabrication of large quantities of layered CuO-δ-MnO₂ hybrids.

Keywords: Self-propagated flaming (SPF) technique; catalytic combustion; highly efficient CuO-δ-MnO2 nanocatalyst; layered transition metal oxide-doped MnO2; volatile organic compounds.