论文部分内容阅读
利用负载型ReOx/ZrO2催化剂,将甲醇选择性氧化并一步合成二甲氧基甲烷。考察了反应时间、反应温度以及铼负载量对反应的影响。并利用N2吸附/脱附、X射线光电子能谱、氨程序升温脱附(NH3-TPD)和氢程序升温还原(H2-TPR)等手段对催化剂进行了表征。结果表明,较高的反应温度有利于提高甲醇的转化率,但对二甲氧基甲烷的选择性不利;催化剂上所负载铼的质量分数对甲醇转化率影响较大,在铼的质量分数为1.64%时转化率达到最大值25.1%;负载于ZrO2上的ReOx具有双功能催化性质:它既可作为氧化中心氧化甲醇,在还原后又可作为酸中心催化醇醛缩合。
With supported ReOx / ZrO2 catalyst, methanol was selectively oxidized and one-step synthesis of dimethoxymethane. The effects of reaction time, reaction temperature and rhenium loading on the reaction were investigated. The catalysts were characterized by N2 adsorption / desorption, X-ray photoelectron spectroscopy, ammonia temperature-programmed desorption (NH3-TPD) and hydrogen temperature-programmed reduction (H2-TPR) The results showed that the higher reaction temperature could improve the conversion of methanol, but the selectivity to dimethoxymethane was unfavorable. The mass fraction of rhenium supported on the catalyst had a great influence on the conversion of methanol. When the mass fraction of rhenium was 1.64% conversion reached a maximum of 25.1%; supported on the ZrO2 ReOx bifunctional catalytic properties: it can serve as the oxidation center of methanol oxidation, but also as an acid center catalytic reduction of aldol condensation.