Removal of VOCs from gas streams with double perovskite-type catalysts

Kuan Lun Pan, Guan Ting Pan, Siewhui Chong, Moo Been Chang

Research output: Contribution to journalArticlepeer-review

40 Scopus citations

Abstract

Double perovskite-type catalysts including La2CoMnO6 and La2CuMnO6 are first evaluated for the effectiveness in removing volatile organic compounds (VOCs), and single perovskites (LaCoO3, LaMnO3, and LaCuO3) are also tested for comparison. All perovskites are tested with the gas hourly space velocity (GHSV) of 30,000 hr− 1, and the temperature range of 100–600°C for C7H8 removal. Experimental results indicate that double perovskites have better activity if compared with single perovskites. Especially, toluene (C7H8) can be completely oxidized to CO2 at 300°C as La2CoMnO6 is applied. Characterization of catalysts indicates that double perovskites own unique surface properties and are of higher amounts of lattice oxygen, leading to higher activity. Additionally, apparent activation energy of 68 kJ/mol is calculated using Mars-van Krevelen model for C7H8 oxidation with La2CoMnO6 as catalyst. For durability test, both La2CoMnO6 and La2CuMnO6 maintain high C7H8 removal efficiencies of 100% and 98%, respectively, at 300°C and 30,000 hr− 1, and they also show good resistance to CO2 (5%) and H2O(g) (5%) of the gas streams tested. For various VOCs including isopropyl alcohol (C3H8O), ethanal (C2H4O), and ethylene (C2H4) tested, as high as 100% efficiency could be achieved with double perovskite-type catalysts operated at 300–350°C, indicating that double perovskites are promising catalysts for VOCs removal.

Original languageEnglish
Pages (from-to)205-216
Number of pages12
JournalJournal of Environmental Sciences (China)
Volume69
DOIs
StatePublished - Jul 2018

Keywords

  • Activation energy
  • Catalysis
  • Double perovskite-type catalyst
  • Toluene (CH)
  • Volatile organic compounds (VOCs)

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