AgNaZSM-5分子筛催化剂的酸性质表征  

Characterization of Acidic Properties of AgNaZSM-5 Catalyst

作　　者：何晓京[1] 黄先亮[1] 王正宝[1] 

机构地区：[1]浙江大学化学工程与生物工程学系,浙江杭州310027

出　　处：《化学反应工程与工艺》2010年第4期361-365,370,共6页Chemical Reaction Engineering and Technology

基　　金：中石化上海石油化工研究院委托项目(G6202-08-ZS-009)

摘　　要：采用离子交换法制备AgNaZSM-5分子筛催化剂,并利用吡啶吸附红外光谱(Py-IR)、氨程序升温脱附(NH_3-TPD)实验和正己烷裂解反应研究AgNaZSM-5催化剂被氧化还原后的酸性质。结果表明;催化剂中的Ag^+很容易被氢气或正己烷还原成Ag,分子筛的阳离子位变成了质子,从而起酸催化作用;在氧化性气氛中,Ag物种以Ag^+形式位于阳离子位上。AgNaZSM-5 was prepared by ion-exchange and the acid properties of AgNaZSM-5 zeolite catalyst were characterized by pyridine-infrared spectroscopy （Py-IR）, NH3-temperature programmed desorption （NH3-TPD） and the reaction of n-hexane cracking. The results showed that Ag cations in zeolite were easily reduced by hydrogen or n-hexane, the cation sites of zeolite became protonic cations and exhibited acid catalysis. Ag species were Ag^＋ in the cation sites of zeolite catalyst in oxidation atmosphere.

关 键 词：分子筛 银 氧化 还原 氨程序升温脱附 吡啶吸附红外光谱 

分 类 号：TQ426[化学工程]