Tomoyuki Hirano, Jun Kikkawa, Daisuke Shimokuri, Asep Bayu Dani Nandiyanto, Takashi Ogi
Metallic tungsten nanoparticles are promising materials due to their unique structures and excellent performances, thus has been applied in energy, catalytic, and metallurgical industries. A mixture of tungsten metal and oxide nanoparticles was synthesized via fuel-rich CH4/air tubular flame process, followed by mild reduction-based post-heating treatment. The high combustion efficiency of the tubular flame process enabled complete O2 consumption in the premixture, along with the emission of CO and H2. The experimental results showed that the tubular flames produced mixtures of amorphous tungsten oxide and crystalline tungsten nanoparticles with primary particle sizes of 5-10 nm, at a production rate of 4.68 mg/hr and an 8.64% yield. These obtained nanoparticles displayed a sinter-necked structure. The oxygen content of the tubular-flame-synthesized mixtures of tungsten metal and oxide nanoparticles (16.8%) to 5.6% after the additional post-heating treatment, which also related the particle size.
Chemical Engineering Program, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Higashi, Kagamiyama, Hiroshima, Hiroshima, 739-8527, Japan; Techanical Engineering Program, Graduate School of Advanced Science and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi, Hiroshima, Hiroshima, 739-8527, Japan; Departemen Kimia, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudhi No. 229, Bandung, 40154, Indonesia
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