Au-Fe/NaY催化膜的制备及其在CO选择性氧化中的应用

Preparation of Au-Fe/NaY catalytic membranes and their application in preferential oxidation of CO(PROX-CO)

以NaY分子筛膜为基体,采用离子交换法制备Au-Fe/NaY催化膜,研究Fe3+前驱体浓度对催化膜上Au负载量及其对CO选择性氧化催化性能的影响,同时考察反应温度、进料O2浓度对催化膜CO选择性氧化反应的影响。结果表明:随着Fe3+前驱体浓度的增加,Au的负载量增加,当Fe3+前驱体溶液浓度为5.0 mmol/L时,所制备的催化膜催化性能最好;催化膜在12 h的反应时间内具有稳定的催化活性;产物中n(CO)/n(H2)随反应温度的升高先降低后升高,在80℃达到最小,且随进料O2浓度的增加而降低。

Au-Fe/NaY catalytic membranes were prepared by an ion-exchange method using NaY zeolite membranes as supports. The effects of Fe3＋ precursor concentration on the gold loading and the activity of catalytic membranes for preferential oxidation of CO （PROX-CO） were studied. The influences of the reaction temperature and O2 concentration in feed were also investigated. The results showed that gold load- ing increased with the increasing of Fe3＋ precursor concentration. The highest catalytic activity was a- chieved on the Fe3＋ precursor concentration of 5.0 mmol/L. Steady catalytic activity was observed over the catalytic membrane during 12 h reaction. The n（CO）/n（H2） in the products decreased firstly with the increasing of reaction temperature, and then increased subsequently, it had a minimum value at 80℃. Besides,the n（CO）/n（H2） decreased with the increasing of O2 concentration in feed.