摘要
考察了稀土镧和铈浸渍改性对β沸石物理化学性质的影响。结果表明，Ｃｅ２Ｏ３在沸石表面上的存在形态与浸渍量有关，浸渍量较高时部分Ｃｅ２Ｏ３以结晶态的形式存在，Ｌａ２Ｏ３只有无定形高分散态一种形式；在改性过程中，部分稀土氧化物进入β沸石的孔道；经铈改性后沸石的强酸中心减少，镧改性后沸石Ｂ酸中心显著减少。萘的甲基化反应结果表明，沸石表面形成的结晶态Ｃｅ２Ｏ３能改善Ｈβ的催化性能，提高催化剂的初活性，改善催化剂的稳定性。
Effects of rare earth Ce and La impregnation on physical and chemical properties of β zeolite were investigated.Amount of Ce 2O 3 impregnated has an important effect on its state of existing over Hβ.When the impregnation amount is high,a part of Ce 2O 3 is found to be crystallized.La 2O 3 exists only in amorphous highly dispersed.During the impregnation,a part of rare earth oxide can enter into channels of β zeolite.Ce impregnation can decrease the amount of strong acidic sites of β zeolite.La impregnation can significantly decrease the amount of B acidic sites of β zeolite.Results of catalytic reactions show that the crystallite Ce 2O 3 on the surface of β zeolite can improve the catalytic properties of Hβ in the methylation of naphthalene.
出处
《石油学报（石油加工）》
EI
CAS
CSCD
北大核心
1998年第4期30-34,共5页
Acta Petrolei Sinica(Petroleum Processing Section)
关键词
Β沸石
Ce2O3
酸性
合成
β zeolite,Ce 2O 3,acidic properties,naphthalene methylation
