Synthesis and characterization of Mn-Phen@support single atom catalyst
Heterogeneous catalysis plays a significant role in many industrial processes, synthesis of chemicals and pharmaceuticals. Among them, noble metal catalyst is the most important one as their ability to activate industrially important reactions. It has been found out that this type of catalyst has some drawbacks due to the low availability and high cost, it is important to pursue the most efficient utilization of these metals. Reducing the particle size is the most straightforward ways to improve the efficiency and utilization of the noble metal catalyst. Recently single atom and nanostructured catalysts are emerged as a new class of catalyst for various types of reactions. However decreasing the size result in the aggregation of atoms. Appropriate support material can strongly interact with the metal and prevents this aggregation, helps to form a stable, finely dispersed single atom catalyst(SAC). Different supports can offer different anchoring sites to stabilize SACs due to chemical bonding interactions between the single atom and the surface. Practically, supported metal catalyst may be inhomogeneous and it may contain nanoparticles and sub nanoparticles also. Different kinds of SACs can be classified according to the type of support- metal oxide, metal surfaces, 2D materials (graphene), mesoporous material (zeolite).In this work we were trying to synthesize some heterogeneous catalyst in a cost effective manner with high conversion and selectivity towards the desired product. we have synthesized some non-noble metal atoms anchored on support. We have used mesoporous alumina and graphene oxide as the support. Mesoporous alumina was prepared using structure directing agent Pluronic-F127. Aluminium isopropoxide is used as the aluminium precursor. Graphene oxide was prepared using Hummers' method. This method involved treatment of graphite with KMnO4, NaNO3 and H2SO4. The prepared graphene oxide was exfoliated by heating at 160° C for 3 days.
Keywords: support, mesoporous alumina, graphene oxide