CoP-TiO2催化剂催化氨硼烷水解制氢性能影响

Influence of CoP-TiO2 catalyst on the catalytic performance of hydrogen production from hydrol-ysis of ammonia borane

摘要:

本研究通过将六水合硝酸钴、F127、钛酸四丁酯、盐酸、乙酸和四氢呋喃混合搅拌,低温烘干后煅烧得到Co-TiO2,随后在氮气气氛下通过低温磷化法制备出2CoP-TiO2催化剂。探究了多种因素对2CoP-TiO2光催化AB水解制氢性能的影响,并对催化剂的微观结构进行了详细表征。实验结果表明,在可见光照射的条件下,当反应温度为298 K时2CoP-TiO2催化剂催化AB水解制氢TOF值为38.7 min-1,活化能为46.4 kJ·mol-1。P组分的引入促使带隙能量降低,电子迁移速率提高,从而促进了光催化反应的进行。催化剂经过5次循环测试后,催化AB水解制氢的反应时间没有明显增加,说明2CoP-TiO2催化剂具有良好的循环稳定性。

Abstract:

In this study, Co-TiO2 was obtained by mixing and stirring cobalt nitrate hexahydrate, F127, tetrabutyl titanate, hydrochloric acid, acetic acid, and tetrahydrofuran, calcined after low-temperature drying, and then 2CoP-TiO2 catalyst was subsequently prepared by low-temperature phosphorylation under nitrogen atmosphere. The effects of various factors on the performance of 2CoP-TiO2 photocatalytic AB hydrolysis for hydrogen production were explored, and the microstructure of the catalyst was characterized in detail. The experimental results showed that the 2CoP-TiO2 catalyst catalyzed the hydrolysis of AB to hydrogen with a TOF value of 38.7 min-1 and an activa-tion energy of 46.4 kJ·mol-1 under visible light irradiation when the reaction temperature was 298 K. The intro-duction of the P component induced a decrease in the bandgap energy and an increase in the electron mobility rate, which promoted the photocatalytic reaction. The reaction time of catalyzed AB hydrolysis for hydrogen production did not increase significantly after the catalyst was tested for five cycles, indicating that the 2CoP-TiO2 catalyst has good cycling stability.