Applied Catalysis A: General ( IF 5.5 ) Pub Date : 2020-01-15 , DOI: 10.1016/j.apcata.2020.117417 Weiyou Zhou , Guanhu Chen , Binxun Yu , Jiacheng Zhou , Junfeng Qian , Mingyang He , Qun Chen
A series of NiGa catalysts have been prepared by calcining Ni5Ga-LDH under different temperatures, detailedly characterized, and investigated in the aerobic oxidation of benzyl alcohol to benzaldehyde in a fixed-bed reactor. The results indicated that calcination has a key effect on the composition of the catalyst and the catalytic performance, and the NiGa hydrotalcite calcined at 250 ℃ (Ni5Ga-LDH-250) exhibited the highest activity, which probably was due to the highest amount of surface basic site and the composition of Ni species. Under the optimized conditions, an excellent 91.5% yield of benzaldehyde could be continuously obtained. Moreover, the catalytic performance kept almost steady in 170 hours, and the catalyst could be regenerated and reused with slight reduction of the catalytic performance. According to the analysis of structure-activity relationship and the results of controlled experiments, possible reaction pathways for the aerobic oxidation of benzyl alcohol over Ni5Ga-LDH-250 are proposed.
中文翻译:
在NiGa水滑石衍生的催化剂上的连续固定床反应器中,用氧气有效地选择性氧化苄醇
已通过在不同温度下煅烧Ni 5 Ga-LDH制备了一系列NiGa催化剂,对其进行了详细表征,并在固定床反应器中将苄醇好氧氧化为苯甲醛。结果表明,煅烧对催化剂的组成和催化性能有关键影响,NiGa水滑石在250℃(Ni 5Ga-LDH-250)表现出最高的活性,这可能是由于最大的表面碱性位点和Ni物种的组成。在最佳条件下,可以连续获得91.5%的优良苯甲醛收率。而且,催化性能在170小时内几乎保持稳定,并且催化剂可以在不降低催化性能的情况下进行再生和再利用。通过对结构-活性关系的分析和可控实验的结果,提出了Ni 5 Ga-LDH-250上苯甲醇有氧氧化的可能反应途径。