催化剂对东都风化煤硝酸氧解及其产物特性的影响
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摘要: 对东都风化煤进行硝酸氧解，利用元素分析与红外光谱分析研究产物硝基腐植酸（NHA）的结构和性质，讨论硝酸氧解中催化剂对硝基腐植酸的产率、元素组成和官能团的影响。结果表明，浓硫酸、过氧化氢、碳纳米管负载过渡金属和固体酸催化剂都能显著提高煤氧解NHA的产率，产物C、H的质量分数和H/C原子比降低，氮的质量分数增加，E4/E6增加。固体酸与浓硫酸对提高产物氮的质量分数更明显，镀镍碳纳米管（CNTs）负载三氧化二铁、碳纳米管负载镍和浓硫酸作为催化剂得到腐植酸分子更小。催化剂存在下产物活性官能团增加更多，不同催化剂对产物有不同的影响。Abstract: Dongdu weathered coal was oxidized with nitric acid. The structures and properties of the products of nitric humic acid (NHA) were investigated by element analysis and Fourier Transform Infrared Spectra (FT-IR). Effects of catalyst on NHA yield, elemental composition and functional group were discussed. The results show that NHA yields increase apparently with catalyst of H2SO4, H2O2, carbon transition metals supported on carbon nanotubes (CNTs) and solid acid. The contents of carbon, hydrogen and H/C atomic ratio of NHA produced decrease while nitrogen contents and E4/E6 value increase. Nitrogen contents increase apparently in the presence of solid acid or H2SO4. Molecules of NHA produced with catalyst of ferric oxide supported on nickel plating CNTs, nickel supported on CNTs or H2SO4 are smaller. The contents of active functional groups increase significantly with catalyst and the influence is dependent on the kind of catalyst.
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Key words:
- weathered coal /
- oxidation degradation /
- humic acid /
- catalyst /
- FT-IR
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