Low-temperature thermocatalytic particulate carbon decomposition via urea solution-combustion derived CeO2 nanostructures

• 作者: S.P.Ratnayake M.M.M.G.P.G.Mantilaka C.Sandaruwan D.Dahanayake Y.Pivini Gunasekara S.Jeyasakthy N.M.Gurusinghe U.K.Wanninayake K.M.Nalin de Silva
• 来源期刊: 稀土学报（英文版）
• 年，卷（期）: 2021,（1）
• 所属期刊栏目: RARE EARTH CATALYSIS
• 页码范围: 67-74
• 页数: 8页
• 语种: 英文

摘要

A facile,one-pot,urea solution combustion route was utilized to synthesize highly catalytic CeO2 nano-structures.CeO2 prepared under varying thermal conditions was characterized by electron microscopy,energy dispersive X-ray spectroscopy,X-ray diffraction,X-ray photoelectron spectroscopy,infrared and Raman techniques.As the synthesis temperature is raised from 400 to 1000 ℃,the crystallite size and d-spacing of nanoparticles are observed to reduce while cell parameters remain in the same range.Particle size exhibits an accession from ～20 to ～50 nm along the process.Initial CeO2 nanoparticles are detected as a composite structure of CeO2 and graphitic carbon nitride (g-C3N4) produced by the pyrolysis of urea.Concerning the solid carbon particulate oxidation capacity,an outstanding performance is exhibited by CeO2 synthesized at 800 ℃ where the oxidation onset temperature is reduced by 27％ compared with the others.The superior performance is attributed to the carbon nitride-generated unique CeO2 nano-morphology consolidating ample reactive sites and facilitated oxygen delivery for a highly efficient thermocatalytic process.Concerning atmospheric pollution mitigation,synthesis of these CeO2 nano-structures represents a cost effective and convenient abatement technique for carbon particulates in comparison to cost-intensive,environmentally detrimental and noble-metal based techniques.