Jiang Weidong, Xu Bin, Fan Guangyin, Zhang Kaiming, Xiang Zhen, Liu Xiaoqiang
School of Chemistry and Environmental Engineering, Sichuan University of Science & Engineering, Zigong 643000, China.
Key Laboratory of Green Catalysis of Sichuan Institute of High Education, Sichuan University of Science & Engineering, Zigong 643000, China.
Nanomaterials (Basel). 2018 Apr 14;8(4):240. doi: 10.3390/nano8040240.
Supported Pd-based catalyst over active nickel oxide (NiO) was repared using the impregnation method companying with UV-light irradiation. Moreover, the catalytic performance of the obtained Pd-based catalysts was evaluated towards the hydrogenation of -chloronitrobenzene (-CNB). Observations indicate that the as-prepared UV-irradiated Pd/NiO catalyst with a mole fraction 0.2% (0.2%Pd/NiO) has higher activity and selectivity in the -CNB hydrogenation. Especially, UV-light irradiation played a positive role in the improvement of catalytic activity of 0.2%Pd/NiO catalyst, exhibiting an excess 11-fold activity superiority in contrast with non-UV-irradiated 0.2%Pd/NiO catalyst. In addition, it was investigated that effects of varied factors (i.e., reaction time, temperature, -CNB/Pd ratio, Pd loading, hydrogen pressure) on the selective hydrogenation of -CNB catalyzed by UV-irradiated 0.2%Pd/NiO catalyst. Under the reaction conditions of 60 °C, 0.5 h, 1 MPa H₂ pressure, 100% conversion of -CNB, and 81.1% -CAN selectivity were obtained, even at high molar ratio (8000:1) of -CNB to Pd.
采用浸渍法并结合紫外光照射制备了负载在活性氧化镍（NiO）上的钯基催化剂。此外，还对所制备的钯基催化剂对氯硝基苯（-CNB）加氢反应的催化性能进行了评价。观察结果表明，所制备的摩尔分数为0.2%的紫外光照射钯/氧化镍催化剂（0.2%Pd/NiO）在对氯硝基苯加氢反应中具有更高的活性和选择性。特别是，紫外光照射对0.2%Pd/NiO催化剂的催化活性提高起到了积极作用，与未进行紫外光照射的0.2%Pd/NiO催化剂相比，其活性优势超过11倍。此外，还研究了各种因素（即反应时间、温度、对氯硝基苯/钯比例、钯负载量、氢气压力）对紫外光照射的0.2%Pd/NiO催化剂催化对氯硝基苯选择性加氢反应的影响。在60℃、0.5小时、1MPa氢气压力的反应条件下，即使在对氯硝基苯与钯的摩尔比高达8000:1的情况下，对氯硝基苯的转化率仍可达100%，对氯苯胺的选择性为81.1%。
