摘要
采用浸渍法制备了ＦｅＭｏ／ＨＺＳＭ５和ＦｅＭｏ／ＫＺＳＭ５分子筛催化剂，利用ＮＨ３ＴＰＤ和Ｏ２ＴＰＤ对催化剂的表面酸性和吸附Ｏ２物种进行了表征，考察了温度、Ｍｏ／Ｆｅ摩尔比、空气／甲醇摩尔比及ＷＨＳＶ对催化性能的影响．实验结果表明，在ＦｅＭｏ／ＫＺＳＭ５催化剂上，适宜的反应条件下，甲醇转化率接近１００％，甲醛选择性达到９０６％．
The effects of reaction temperature, Mo/Fe molar ratio, air/methanol molar ratio and WHSV on methanol oxidation over FeMo/HZSM5 and FeMo/KZSM5 catalysts were investigated. The results indicate that the FeMo/KZSM5 has higher activity than the FeMo/HZSM5. Under optimum conditions the methanol conversion and the formaldehyde selectivity reach 100% and 906% respectively. The NH3TPD and O2TPD results show that the FeMo/HZSM5 catalyst has more sites of acidity and less sites of oxygen adsorption than the FeMo/KZSM5 catalyst. The experiments show that the site of strong acidity decreases the formaldehyde selectivity and the site of oxygen adsorption at higher temperature increases the formaldehyde selectivity. This might be the reasons that the selectivity of methanol oxidation to formaldehyde increased over FeMo/KZSM5 catalyst.
出处
《催化学报》
SCIE
EI
CAS
CSCD
北大核心
1999年第4期429-432,共4页
基金
广西壮族自治区科委自然科学基金
关键词
铁
钼
KZSM-5
分子筛
甲醇
氧化
甲醛
催化剂
ferric oxide, molybdic oxide, KZSM5 zeolite, methanol, catalytic oxidation, formaldehyde
