ZIF-67 derived CoSx/NC catalysts for selective reduction of nitro compounds

ZIF-67衍生的CoSx/NC催化剂的制备及其对硝基化合物的选择性还原

Transition metal sulfides(TMSs)-based materials have been extensively investigated as effective non-noble catalysts for various applications.However,the exploration of TMSs-based catalysts for hydrogenation of nitro compounds is limited.Herein,CoSx/NC catalysts were prepared by solvothermal sulfurization of ZIF-67,followed by high-temperature annealing(300–600℃)under NH3 atmosphere.It was found that the structures and compositions of the as-prepared CoSx/NC can be readily tuned by varying the annealing temperature.Particularly,CoSx/NC-500,which possesses higher degree of S defects and larger specific surface areas,can achieve high conversion,selectivity and stability for catalytic reduction of nitro compounds into amines under mild reaction conditions.

过渡金属硫化物作为高效的非贵金属催化剂,已在化工领域得到了广泛的应用。但是,很少将其应用于硝基化合物的催化加氢反应中。在本文中,通过硫化金属有机框架材料ZIF-67,并在氨气气氛下进行退火,制备得到了CoSx/NC催化剂。研究发现,该类催化剂的结构和组成可通过改变退火温度进行调控。特别是,当退火温度为500℃时,得到的催化剂CoSx/NC-500由于具有高的硫缺陷和比表面积,可在温和反应条件下高选择性地将硝基化合物还原成相应的氨基化合物。