【摘要】 以原位还原的方法一步合成了Ag/SBA-15复合催化剂,通过粉末XRD、TEM、ICP-AES和低温氮气吸附-脱附等手段对样品进行了表征.考察了不同催化剂对CO催化活性的影响,结果表明当金属纳米的尺寸大小为6~8nm左右,银的含量为6.86%时(Ag/SBA-15-3)的催化活性最高,在120℃时就可使CO完全氧化,可以重复使用,在100%的转化温度时保持200min转化率仍不降低.更多还原

【Abstract】 The Ag/SBA-15 composite catalysts were prepared via in situ reduction method, and characterized by XRD, TEM, ICP-AES and N2 adsorption/desorption. The catalytic performances of catalysts for CO oxidation were examined. The results show that the highest catalytic activity has been obtained for an average Ag-nanoparticle size of about 6?8 nm and the Ag content of 6.86% (Ag/SBA-15-3 catalyst), which results in 100% CO conversion at 120 oC. The measurement of catalytic stability revealed that catalysts could be recycled and maintain catalytic stability for 200 min.更多还原