南开大学学报（自然科学版）
南開大學學報（自然科學版）
남개대학학보（자연과학판）
ACTA SCIENTIARUM NATURALIUM UNIVERSITATIS NANKAIENSIS(NATURAL SCIENCE EDITION)
1999年
4期
66-71
,共6页
周灵萍%李伟%杨萍%李赫咺%陶克毅
週靈萍%李偉%楊萍%李赫咺%陶剋毅
주령평%리위%양평%리혁훤%도극의
X光电子能谱%29Si魔角核磁共振%化学组成%电子结构%分子筛
X光電子能譜%29Si魔角覈磁共振%化學組成%電子結構%分子篩
X광전자능보%29Si마각핵자공진%화학조성%전자결구%분자사
X-ray photoelectron spectroscopy%29Si MAS NMR%chemical composition%electronic structure%zeolites
采用光电子能谱和Si核磁共振及化学分析方法研究了五种不同分子筛钠型和钾型的化学组成.结果发现,分子筛的表面Al/(Si+Al)比和骨架Al/(Si+Al)比与其体相Al/(Si+Al)比具有一致性,其电子结构与其组成及阳离子有关.分子筛表面晶格氧碱强度与其铝含量成正比,与阳离子的电负性成反比.
採用光電子能譜和Si覈磁共振及化學分析方法研究瞭五種不同分子篩鈉型和鉀型的化學組成.結果髮現,分子篩的錶麵Al/(Si+Al)比和骨架Al/(Si+Al)比與其體相Al/(Si+Al)比具有一緻性,其電子結構與其組成及暘離子有關.分子篩錶麵晶格氧堿彊度與其鋁含量成正比,與暘離子的電負性成反比.
채용광전자능보화Si핵자공진급화학분석방법연구료오충불동분자사납형화갑형적화학조성.결과발현,분자사적표면Al/(Si+Al)비화골가Al/(Si+Al)비여기체상Al/(Si+Al)비구유일치성,기전자결구여기조성급양리자유관.분자사표면정격양감강도여기려함량성정비,여양리자적전부성성반비.
Chemical compositions of five zeolites in their sodium and potassium forms were systematically investigated by utilizing XPS, 29Si MAS NMR and chemical analysis. It was shown that the surface Al/(Si+Al) ratios and the framework Al/(Si+Al) ratios are generally equal to the bulk Al/(Si+Al) ratios. It was demonstrated that the electronic structure of zeolites depended strongly on both the composition and the cation involved. It is proved that the basic strength of lattice oxygen in zeolite enhances as the Al content increases and as electronegativity of cation decreases.
