Sharma Nitika, Choudhary Anu, Kaur Manpreet, Sharma Chandan, Paul Satya, Gupta Monika
Department of Chemistry, University of Jammu Jammu Tawi-180006 India
RSC Adv. 2020 Aug 14;10(50):30048-30061. doi: 10.1039/d0ra01540g. eCollection 2020 Aug 10.
Herein, well dispersed Ag-Cu NPs supported on modified graphene have been synthesized a facile and rapid approach using sodium borohydride as a reducing agent under ambient conditions. Dicyandiamide is selected as an effective nitrogen source with TiO as an inorganic material to form two kinds of supports, labelled as TiO-NGO and NTiO-GO. Initially, the surface area analysis of these two support materials was carried out which indicated that N-doping of GO followed by anchoring with TiO has produced support material of larger surface area. Using both types of supports, ten nano-metal catalysts based on Ag and Cu were synthesized. Benefiting from the bimetallic synergistic effect and larger specific surface area of TiO-NGO, Cu@Ag-TiO-NGO is found to be a highly active and reusable catalyst out of other synthesized catalysts. It exhibits excellent catalytic activity for oxidation of alcohols and hydrocarbons as well as Chan-Lam coupling reactions. The nanocatalyst is intensively characterized by BET, SEM, HR-TEM, ICP-AES, EDX, CHN, FT-IR, TGA, XRD and XPS.
在此，通过一种简便快速的方法，以硼氢化钠为还原剂，在环境条件下合成了负载在改性石墨烯上的分散良好的Ag-Cu纳米颗粒。选择双氰胺作为有效的氮源，以TiO作为无机材料，形成了两种载体，分别标记为TiO-NGO和NTiO-GO。最初，对这两种载体材料进行了表面积分析，结果表明，对氧化石墨烯进行氮掺杂并随后与TiO锚定，产生了具有更大表面积的载体材料。使用这两种载体，合成了十种基于Ag和Cu的纳米金属催化剂。受益于双金属协同效应和TiO-NGO较大的比表面积，发现Cu@Ag-TiO-NGO是其他合成催化剂中一种高活性且可重复使用的催化剂。它对醇类和烃类的氧化以及Chan-Lam偶联反应表现出优异的催化活性。通过BET、SEM、HR-TEM、ICP-AES、EDX、CHN、FT-IR、TGA、XRD和XPS对该纳米催化剂进行了深入表征。
