摘要
在γ－Ａｌ２Ｏ３中加入Ｚｎ２＋，Ｍｇ２＋，Ｃｕ２＋或Ｃｒ３＋后用漫反射光谱法研究了它们对随后加人的Ｃｏ分布的影响，同时还研究了这些离子对水煤气变换反应催化剂ＣｏＭｏＫ／Ａｌ２Ｏ３的催化活性的影响．发现Ｚｎ２＋，Ｍｇ２＋具有阻止Ｃｏ进入载体内层的作用，Ｃｕ２＋，Ｃｒ３＋的作用则相反．四面体配位倾向强的金属离子能阻止Ｃｏ进入载体内层，从而促进水煤气变换反应的催化活性，而八面体配位倾向强的金属离子的效果刚好相反．在６５０℃下，１００ｇＡｌ２Ｏ３含７ｇＭｇＯ时，Ｍｇ能最大限度地阻止Ｃｏ向Ａｌ２Ｏ３内层扩散，从而提高了ＣｏＭｏｋ／Ａｌ２Ｏ３的催化活性．
iffuse reflectance spectroscopy was used to study the influence on Codispersion in γ-Al2O3 after adding Zn2+, Mg2+, Cu2+ and Cr3+ in γ-Al2O3 in advance, and the influence on the activity for water-gas-shift reaction ofCoMoK/γ-Al2O3 was also studied. Zn2+ and Mg2+ prevent Co from diffusing into γ-Al2O3 Cu2+ and Cr3+ show opposite effect. So the metal ions having strong tetrahedral site preference can prevent Co from .diffusing into Y-Al2O3and promote the activity of catalyst CoMoK/γ-Al2O3. The metal ions havingstrong octahedral site preference give opposite effect. At 650℃, the Mg content, which can most prevent Co from diffusing into Al2O3, is 7%.
出处
《催化学报》
SCIE
CAS
CSCD
北大核心
1996年第2期128-132,共5页
关键词
钴
氧化铝
催化剂
漫反射光谱
水煤气
催化活性
o/γ-Al2O3 catalyst, CoMoK/γ-Al2O3 catalyst, diffuse reflectance spectroscopy,water gas shift reaction
