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催化学报  2015 

水热合成一锅法制备FePO4-SBA-15及其水热稳定性能

DOI: 10.1016/S1872-2067(14)60202-3, PP. 446-453

Keywords: 磷酸铁,SBA-15,介孔材料,水热稳定性,水蒸气,金属担载量

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Abstract:

?通过两种水热处理方式,即800℃水汽条件和100℃沸水处理,考察了一锅法制备的FePO4-SBA-15(OP)的水热稳定性.水热处理前后样品的结构变化通过小角X射线衍射和N2物理吸附表征.研究发现,经水热条件下原位生成FePO4修饰后的OP样品具有良好的水热稳定性,并且FePO4的担载量(5%和40%)对OP样品的水热稳定性几乎没有影响.这与文献报道的金属担载量会影响介孔材料水热稳定性的结果不同.此外,还对比研究了浸渍法制备的FePO4/SBA-15(IMP)和商品SBA-15的水热稳定性.结果表明,各样品水热稳定性由强到弱的顺序是OP>IMP>>SBA-15.OP和IMP样品水热稳定性优于纯硅分子筛SBA-15的原因可能是FePO4保护层能抑制介孔材料在水热环境下的结构塌陷.OP样品水热稳定性较IMP样品好的原因可能主要是由于OP样品中存在稳定的Si-O-Fe键和较多的微孔.

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