摘要
运用红外技术和高斯函数对红外谱图进行分峰拟合，研究了对ＮｉＯ在ＵＳＹ分子筛、γ－Ａｌ２Ｏ３和混合载体上的对ＮＯ吸附规律，并推断出不同ＮｉＯ含量时，Ｎｉ２＋在这些载体上的分布．结果表明：位于γ－Ａｌ２Ｏ３表面、ＵＳＹ分子筛ＳⅡ、ＳⅠ位和ＳⅡ位的Ｎｉ２＋离子吸附ＮＯ时，它们的吸附频率分别为１８５５～１８７５、１９００和１９０５ｃｍ－１．ＮｉＯ在γ－Ａｌ２Ｏ３的体相和表面间存在分布平衡，约有７５％ＮｉＯ存在于γ－Ａｌ２Ｏ３体相中．在ＵＳＹ分子筛上，Ｎｉ２＋分布于分子筛ＳⅠ位的趋势远大于ＳⅡ和ＳⅡ、ＳⅠ位．增加ＮｉＯ含量将增强这种趋势．在混合载体上，Ｎｉ２＋分布于Ａｌ２Ｏ３表面的能力大于分布于分子筛的ＳⅡ和ＳⅡ、ＳⅠ位，增加ＮｉＯ量，分布于γ－Ａｌ２Ｏ３表面及ＵＳＹ分子筛ＳⅡ位的Ｎｉ２＋量显著增加，而分布于分子筛ＳⅡ。
The distribution of Ni\+\{2+\} ions on USY zeolite, \%\%\|alumina and their mixed carriers is studied according to their NO adsorption. When Ni\+\{2+\} ions locate on S\-\{\}, S\-\{\} (S\-\{\}) sites of USY zeolite or on the surface of alumina, the IR spectra of their NO adsorption show the bands at \{1 905\}, \{1 900\} or \{1 855\_1 871 cm\+\{-1\}\} respectively. When NiO loading on NiO/Al\-2O\-3 samples is less than 8%, the Ni\+\{2+\} ion distribution has an equilibrium between the surface and the bulk of \%\%\|alumina. The proportion is about one\|third. On USY zeolite, Ni\+\{2+\} ions prefer to occupy its S\-\{\} sites rather than its S\-\{\}, S\-\{\} and S\-\{\} sites. The tendency strengthens obviously with the increase of NiO loading. On MS mixed carriers, more Ni\+\{2+\} ions located on the surface of alumina than on S\-\{\} and S\-\{\}, S\-\{\} sites of USY zeolite. The number of Ni\+\{2+\} ions on the surface of alumina or on S\-\{\} sites of USY zeolite increases greatly with increasing \=
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1999年第2期254-259,共6页
Chemical Journal of Chinese Universities
基金
国家自然科学基金
抚顺石油化工研究院资助
关键词
USY
分子筛
一氧化氮
吸附
催化剂
镍
酸性
NO adsorption
USY zeolite
\%\%\|Alumina
NiO
Distribution of Ni\+\{2+\} NiO loading
and then the number of Ni\+\{2+\} ions on S\-\{\}
S\-\{\} sites does not affected obviously.
