负载型固体碱催化剂K_2O/γ-Al_2O_3的新型合成法及微量吸附量热研究  

NOVEL SYNTHESIS AND MICROCALORIMETRIC STUDY ON LOADING SOLID BASE CATALYST-K_2O/γ-Al_2O_3

作　　者：李大塘[1] 蔡铁军[1] 郭军[1] 

机构地区：[1]湘潭师范学院化学系,湖南湘潭411201

出　　处：《化学研究与应用》2000年第2期145-147,共3页Chemical Research and Application

基　　金：湖南省自然科学基金! (98JJY2 0 57);湖南省教委科研基金!资助课题

摘　　要：用浸渍法制备 KNO3/Al2 O3样品。所得样品于 973 K下焙烧并抽空 2 h便制得负载型固体碱 K2 O/γ-Al2 O3。拉曼光谱显示 973 K抽空的样品 KNO3已完全分解成 K2 O。用 CO2 作探针分子 ,微量吸附量热结果表明 973 K抽空的样品碱性比纯 Mg O的还强。这种强碱性应为 KNO3完全分解成 K2 O物种所致 ,而 γ-Al2 O3载体的存在可增强 KNO3的分解。The KNO 3/γ Al 2O 3 sample(6.3mmol·g -1 )was prepared by incipient wetness impregnation.Loading solid base K 2O/γ Al 2O 3 obtained from KNO 3/γ Al 2O 3 sample by evacuation at 973K.Raman spectroscopy studies of NO x - indicated that the potassium nitrate has been completely decomposed into potassium oxide when the sample was evacuated at 973K.The sample evacuated at 973K showed the basicity (initial heat of 160KJ·mol -1 ),stronger than that of the MgO in microcalorimetric measurement.It should be attributed to potassium oxide species obtained from potassium nitrate as decomposed at 973K,the existence of γ Al 2O 3 support apparently promoted the decomposition of potassium nitrate.

关 键 词：K2O/γ-Al2O3 微量吸附量热 固体碱催化剂 合成 

分 类 号：O643.36[理学—物理化学] TQ426.99[理学—化学]