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OALib Journal期刊
ISSN: 2333-9721
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不同wo3含量对ceo2-zro2-wo3催化剂在nh3选择性催化还原no中的影响
, PP. 701-707
Keywords: 选择性催化还原,wo3,氧化还原性能,表面酸度
Abstract:
？采用水热法制备了ceo2-zro2-wo3(czw)催化剂,考察了wo3含量对czw催化剂上nh3选择性催化还原nox性能的影响,并利用x射线衍射、n2吸附-脱附、h2程序升温还原、nh3和no程序升温脱附等方法对其进行了表征。结果表明,wo3以无定形的形式存在于催化剂中,添加wo3后显著提高了催化剂的表面酸性,并且在czw催化剂上出现了强吸附的no物种,从而有利于提高催化剂的活性。另外,适量的wo3引入将增大催化剂的比表面积,促进催化剂的氧化还原性能,这将有利于提高scr的催化活性。和ceo2-zro2催化剂相比,当wo3的含量为20%时,czw催化剂表现出良好的抗硫性能。此外,当空速为60000h-1时,在200~463℃,该催化剂显示出了大于90%nox转化率。
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