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- 저자 : Bojun Zhao (검색결과 2 건)
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Oxygen removal from nitrogen using YBaCo_2O_(5+δ) adsorbent
Haoshan Hao,Bojun Chen,Limin Zhao,Xing Hu 한국화학공학회 2011 Korean Journal of Chemical Engineering Vol.28 No.2
The oxygen intake/release behavior of YBaCo_2O_(5+δ) and its application as a medium-temperature (100-600℃) adsorbent to oxygen removal in nitrogen purification was investigated. The oxygen content in YBaCo_2O_(5+δ)was varied between 5.46 and 5.0 with the change of the temperature and oxygen partial pressure. This oxygen nonstoichiometry showed good reversibility and the crystal structure of YBaCo_2O_(5+δ) remained stable in the oxygen intake/release process. Results of nitrogen purification experiment show that YBaCo_2O_(5+δ) material is a promising candidate to remove trace oxygen from nitrogen. After being deoxidized at 600 oC in nitrogen, 1 kg YBaCo_2O_(5+δ) adsorbent can purify 310 L nitrogen of 98.1% to high-purity nitrogen of over 99.9999% in one cycle.
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Oxidation of Zhundong subbituminous coal by Fe2+/H2O2 system under mild conditions
Shuai Chen,Wei Zhou,Mingjun Liu,Guangbo Zhao,Qingxi Cao,Bojun Zhao,Kaikai Kou,Jihui Gao 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.4
Oxidation of coal under mild conditions is effective not only to understand the macromolecular network structure of coal but also to produce useful chemicals, allowing more efficient application of coal resources. In this work, the mild oxidation of Zhundong subbituminous coal (ZS) by Fe2+/H2O2 system was carried out under various conditions, including [Fe2+]/[H2O2] molar ratio, temperature, H2O2 concentration and oxidation time. The liquid oxidation products were analyzed using gas chromatography/mass spectrometry (GC/MS), and the chemical structure changes were studied using Fourier transform infrared spectroscopy (FTIR). The results suggest that the oxidation efficiency of ZS with H2O2 is enhanced with the aid of Fe2+. The optimum conditions were determined to be [Fe2+]/[H2O2] molar ratio of 0.00453, H2O2 concentration of 3mol/L, 60 oC and 4 h according to the oxidation conversion rate. In total, 25 compounds were identified, which could be categorized as six group components. Most of them are valuedadded chemicals, and the content of benzene carboxylic acids is the highest among them, making up 29.99% of all group components in total relative content (TRC). -CH2- should be primary bridge connecting the aromatic rings, and alkylene chains linking three aromatic rings are abundant in ZS.
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