Prekob Ádám, Muránszky Gábor, Szőri Milán, Karacs Gábor, Kristály Ferenc, Ferenczi Tibor, Fiser Béla, Viskolcz Béla, Vanyorek László
Institute of Chemistry, University of Miskolc, 3515 Miskolc-Egyetemváros, Hungary.
MTA-ME Materials Science Research Group, ELKH, Hungary.
Nanotechnology. 2021 Jul 26;32(42). doi: 10.1088/1361-6528/ac137d.
Carbon black (CB) supported palladium-platinum catalysts were prepared with and without nickel(II) oxide or iron(III) oxide promoter materials. By applying ultrasonic cavitation highly efficient CB supported catalysts were created. The designed catalyst preparation is a one-step procedure, as post-treatments (e.g. calcination, hydrogen activation) are not necessary. The activation of the catalysts occurs during their preparation due to the ultrasonic cavitation. Thus, a fast and simple catalyst preparation procedure have been developed. The activity of the catalysts was compared in nitrobenzene hydrogenation at different temperatures in the range of 283-323 K at 20 bar hydrogen pressure. In terms of selectivity and aniline yield, no significant differences were detected even when promoters were present. By using the NiO promoter, the activation energy was extremely low (7.6 ± 0.7 kJ mol). The selectivity was over 99% in every case, and 99.6% aniline yield was achieved without any promoters (99.7% with NiO), while less than 1.0% by-products were formed. The reaction rate was high with every catalyst, and no significant differences were detected. All in all, the prepared catalysts show excellent catalytic activity in the hydrogenation of nitrobenzene.
制备了含和不含氧化镍或氧化铁促进剂材料的炭黑（CB）负载钯 - 铂催化剂。通过应用超声空化作用，制备出了高效的炭黑负载催化剂。所设计的催化剂制备过程为一步法，无需进行后处理（如煅烧、氢气活化）。由于超声空化作用，催化剂在制备过程中就发生了活化。因此，开发出了一种快速且简单的催化剂制备方法。在20巴氢气压力下，对不同温度（283 - 323 K）范围内硝基苯加氢反应中催化剂的活性进行了比较。在选择性和苯胺产率方面，即使存在促进剂也未检测到显著差异。使用氧化镍促进剂时，活化能极低（7.6 ± 0.7 kJ/mol）。在每种情况下，选择性均超过99%，未使用任何促进剂时苯胺产率达到99.6%（使用氧化镍时为99.7%），同时副产物形成量小于1.0%。每种催化剂的反应速率都很高，未检测到显著差异。总体而言，所制备的催化剂在硝基苯加氢反应中表现出优异的催化活性。
