铁钒复合固体酸催化剂在制备腐植酸中的应用研究

The Research of Fe-V Composite Solid Acid Catalyst Applied to Produce Humic Acid

文章利用沉淀-浸渍法制备不同配比的铁钒复合固体酸催化剂,并应用于老万煤制腐植酸中。利用元素分析、官能团分析和红外光谱分析研究产物硝基腐植酸(NHA)的结构和性质,考察了硝酸氧解过程中固体酸催化剂不同金属配比、用量对硝基腐植酸的产率、元素组成和官能团的影响。结果表明,固体酸催化剂能显著提高煤氧解NHA的产率,产物C、H含量降低,H/C原子比降低,N含量增加,E4/E6增加。在铁钒比(摩尔比)为8∶1时用30%硝酸硝化30min产率可提高5.54%,在铁钒比(摩尔比)为2∶1时产率可提高11.25%。

Different ratio of Fe-V composite solid acid catalyst were produced using precipitation - impregnation, and applied to oxidize degrade Laowan coal to produce humic acid. The structures and properties of nitric humic acid （NHA） were investigated by element analysis, functional group analysis and fourier transform Infrared spectra （FTIR）. Effects of different ratio of solid acid catalyst, were investigated on NHA yield, elemental composition and functional group, respectively. The results showed that the solid acid catalyst can significantly increased the NHA yield by coal oxide-degradation. The contents of carbon, hydrogen and H/C atom ratio of NHA produced decrease while nitrogen contents and optical density E4/E6 value increased. NHA yield increased 5.54 % and 11.25 % in turn under the condition of Fe ： V（mol/mol） 8 ： 1 and Fe ： V（mol/mol） 2 ： 1 with 30 wt % nitric acid for 30 min.