【摘要】 分别以硝酸盐、盐酸盐和硫酸盐为金属盐前体,采用共沉淀法合成了MgAlCuFe类水滑石前驱体,经过700℃焙烧6h后,制得三种新型FCC硫转移剂.运用X射线衍射、热重、氮气吸附和红外光谱对这三种硫转移剂的结构和性能进行了表征,并采用改装的WRP-3热重天平评价了其氧化吸硫和还原脱硫的性能.结果表明,三种金属盐均可得到结构规整的类水滑石前驱体,经过焙烧后得到复合氧化物MgAlCuFe.与采用盐酸盐和硫酸盐作前体相比,由硝酸盐制得的硫转移剂具有较大的比表面积,其饱和吸附硫容和氧化吸硫速率均较高,6min可达到1.54g/g的饱和吸附能力,同时具有较强的还原脱硫能力.更多还原

【Abstract】 A series of MgAlCuFe complex oxides used for the removal of SOx from FCC flue gas were prepared by decomposition of MgAlCuFe hydrotalcite precursors at 700 ℃ for 6 h. The influence of different metal salts in the sulfur transfer catalyst was investigated. X-ray diffraction, thermogravimetric analysis, N2 adsorption, and infrared spectroscopy showed that all the sulfur transfer catalysts exhibited a better dispersion of metal oxides in the matrix. The results of the SO2 adsorption-reduction test showed that the novel catalyst MgAlCuFe prepared from nitrates reached 1.54 g/g of total saturation adsorption capacity in 6 min under the conditions similar to those of typical FCC. These catalysts achieved high oxidative adsorption rate, short saturation time, and large reductive capacity.更多还原