Faculty of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China.
J Nanosci Nanotechnol. 2020 Mar 1;20(3):1723-1731. doi: 10.1166/jnn.2020.16985.
Hydroxyapatite nanorod-supported metallic Cu nanoparticle catalysts (Cu/HAP) were prepared by the wetness chemical reduction method. The metallic Cu nanoparticles were well dispersed on the surfaces of the HAP nanorods. The alkaline HAP nanorods inhibited the crystal growth of the metallic Cu0 nanoparticles. The HAP nanorods also retarded the oxidation of the metallic Cu nanoparticles. The Cu/HAP catalyst exhibited a higher catalytic activity for the oxidation of 1,2-propanediol with gaseous oxygen to lactic, acetic, and formic acids with the total selectivity of 70.3% even at a lower reaction temperature of 140 °C. The total selectivity of lactic, acetic, and formic acids reached 93.1% at a mild reaction temperature of 180 °C. However, the sole monometallic Cu nanoparticles or HAP nanorods had no catalytic activity for the oxidation of 1,2-propanediol. The metallic Cu nanoparticles and alkaline HAP nanorods in the Cu/HAP catalyst synergistically catalyzed the oxidation of 1,2-propanediol to carboxylic acid.
羟基磷灰石纳米棒负载的金属 Cu 纳米粒子催化剂（Cu/HAP）是通过湿法化学还原法制备的。金属 Cu 纳米粒子很好地分散在 HAP 纳米棒的表面上。碱性 HAP 纳米棒抑制了金属 Cu0 纳米粒子的晶体生长。HAP 纳米棒还延缓了金属 Cu 纳米粒子的氧化。Cu/HAP 催化剂在较低的反应温度 140°C 下，对 1,2-丙二醇与氧气气相氧化为乳酸、乙酸和甲酸具有更高的催化活性，总选择性甚至达到 70.3%。在温和的反应温度 180°C 下，乳酸、乙酸和甲酸的总选择性达到 93.1%。然而，单独的单金属 Cu 纳米粒子或 HAP 纳米棒对 1,2-丙二醇的氧化没有催化活性。Cu/HAP 催化剂中的金属 Cu 纳米粒子和碱性 HAP 纳米棒协同催化 1,2-丙二醇氧化为羧酸。
