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.
出处
《化学研究与应用》
CAS
CSCD
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
