Ni基催化剂的氢-水汽相催化交换性能

Ni Catalyst for Hydrogen Isotope Exchange Between Hydrogen and Vapor Water

汽相催化交换(VPCE)是水除氚的重要手段之一,本研究采用金属Ni替代常用的贵金属Pt作为逆流型VPCE工艺的催化剂,研究了其在多种实验条件下HDO-H2反应体系中的静态及动态催化交换性能。实验结果表明:静态实验时,催化剂在温度大于200℃、压力和反应物浓度的摩尔比值(HDO∶H2)越大的条件下,催化交换反应向正方向移动,催化性能更好;在Ni高负载率的情况下,其催化性能优于Pt基催化剂。动态实验时,产物平衡氘浓度与静态实验一致,H2中氘摩尔浓度均为1%左右;且进料比例对结果的影响规律与静态实验一致,反应物HDO越多,产物氘浓度越大。本研究表明了纯Ni催化剂在HDO-H2催化交换反应体系中有着较为明显的催化作用,可以替代传统贵金属Pt作为逆流型VPCE工艺的催化剂。

Vapor phase catalytic exchange （VPCE） is one of the important methods for water detritiation. This paper focuses on investigating the catalytic performance of the nickel which could replace platinum catalyst for HDO-H2 static and dynamic experiment under different conditions. The experimental results show that when the temperature is over 200 ℃, and the pressure as well as the mole ratio of HDO-H2 are higher, the nickel catalyst exhibits better catalytic effect in static experiment. It is also found that Ni with high loading has a better catalytic performance than Pt. In the dynamic experiments, the resultant deuterium concen- tration is about 1% which is in agreement with the results of static experiments. The resultant deuterium concentration is higher when there is more HDO. This study shows that cheap metal Ni catalyst can effectively replace noble metal Pt in HDO-H2 exchange reaction, which is o{ importance in the practical application.