【摘要】 分别以MgO为镁源,拟薄水铝石为铝源,以Zn、Fe、Ce的氯化盐为助剂,水热法合成了MgA lZnFeCe类水滑石前驱体,经过700℃焙烧6h后,制得新型FCC硫转移剂MgA lZnFeCe复合氧化物.运用XRD、TG-DTA等对硫转移剂及其前驱体的结构和物化性能进行了表征;在模拟FCC反应再生条件下,采用改装的WRP-3热重天平评价了硫转移剂的氧化吸硫和还原脱硫的性能.结果表明,采用水热法合成的前驱体材料具有典型的类水滑石结构,但MgO不能完全进入水滑石相,以Mg(OH)2的形式存在;类水滑石材料经过焙烧后得到复合氧化物MgA lZnFeCe-LDOs,在FCC再生烟气硫转移中具有良好的饱和吸附硫容量和氧化吸硫速率,10m in可达到1.16g/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】 MgAlZnFeCe hydrotalcite-like precursors were prepared by a hydrothermal method using MgO as magnesium resource and pseudoboehmite as aluminum resource,and using metal chlorides of Zn,Fe and Ce as catalytic additives.MgAlZnFeCe complex oxides were prepared by decomposition of MgAlZnFeCe hydrotalcite-like precursors at 700℃ for 6h,which were used for the removal of SOx from FCC flue gas.XRD,TG-DTA analysis show that hydrotalcite-like compound is the major component while the minor phase is Mg(OH)2 as the impure phase.The results of SOx adsorption-reduction test show that the novel catalyst MgAlZnFeCe-LDO reaches 1.16g/g of total saturation adsorption capacity in 10min in the condition similar to that of a typical FCC,which achieves high oxidative adsorption rate,short saturation time,and large reductive capacity.更多还原