Wang Kaiying, He Xiaoqing, Wang Jee-Ching, Liang Xinhua
Linda and Bipin Doshi Department of Chemical and Biochemical Engineering, Missouri University of Science and Technology, Rolla, MO 65409, United States of America.
Electron Microscopy Core Facility, University of Missouri, Columbia, MO 65211, United States of America.
Nanotechnology. 2022 Mar 4;33(21). doi: 10.1088/1361-6528/ac5540.
Pt-Co bimetallic catalysts were deposited on-AlOnanoparticles by atomic layer deposition (ALD) and were used for selective hydrogenation of cinnamaldehyde (CAL) to cinnamyl alcohol (COL). High resolution transmission electron microscopy, hydrogen temperature-programmed reduction, x-ray diffraction, and x-ray photoelectron spectroscopy were used to identify the strong interaction between Pt and Co. The obtained catalysts with an optimal Pt/Co ratio achieved a COL selectivity of 81.2% with a CAL conversion of 95.2% under mild conditions (i.e., 10 bar Hand 80 °C). During the CAL hydrogenation, the addition of Co on Pt significantly improved the activity and selectivity due to the synergetic effects of Pt-Co bimetallic catalysts, resulted from the transfer of electrons from Co to Pt, which can stabilize the carbonyl groups. The obtained Pt-Co bimetallic catalysts also showed excellent stability due to the strong interaction between the metal nanoparticles and the alumina support. Negligible losses in the activity and selectivity were observed during the recycling experiments, showing the potential for practical applications.
通过原子层沉积（ALD）将铂钴双金属催化剂沉积在氧化铝纳米颗粒上，并将其用于肉桂醛（CAL）选择性加氢制备肉桂醇（COL）。采用高分辨率透射电子显微镜、氢气程序升温还原、X射线衍射和X射线光电子能谱来确定铂和钴之间的强相互作用。所制备的具有最佳铂/钴比的催化剂在温和条件下（即10巴氢气和80℃）实现了95.2%的CAL转化率和81.2%的COL选择性。在CAL加氢过程中，由于铂钴双金属催化剂的协同效应，在铂上添加钴显著提高了活性和选择性，这是由电子从钴转移到铂导致的，从而可以稳定羰基。由于金属纳米颗粒与氧化铝载体之间的强相互作用，所制备的铂钴双金属催化剂还表现出优异的稳定性。在循环实验中观察到活性和选择性的损失可忽略不计，显示出实际应用的潜力。
