NH_3-TPD法表征RE_2O_3/HY的酸性

The Acidity of RE_2O_3/HY Characterized by NH_3-TPD

用ＮＨ３－ ＴＰＤ法研究了ＲＥ２Ｏ３／ＨＹ 的酸性． 结果表明：ＨＹ 沸石具有较强的表面酸性，用特殊混合法负载ＲＥ２Ｏ３ 后，碱性的ＲＥ２Ｏ３ 与ＨＹ载体的强酸中心作用抑制了表面酸性，随负载量的增加，表面被中和的酸位数量增加，直至负载量≥３０％ 时，ＲＥ２Ｏ３ 对表面酸位的中和作用才告完毕．

The acidity of RE 2O 3/HY was characterized by NH 3-TPD.The experimental results show that HY zeolite has a strong acidity. After RE 2O 3 mixed with HY zeolite in a special method, the interaction between RE 2O 3 and HY restrains strong acid sites. With the increase of amount of supported species, the acid site neutralizated increases. The neutralizating action isn,t end until the amount of supported species reach 30%.