MOFs have attracted a great deal of attention in academia and industry, because of their versatility and potential applications [22] and [29]. There are several interesting characteristics that make MOFs unique and different from other conventional porous solids. These include (a) simple and easy synthesis compared with zeolites [14] and [21]; (b) huge surface areas and tunable porosities [21] and [29]; (c) the presence of coordinatively unsaturated sites (CUSs or open metal sites, OMSs) [30]; and (d) the ability to incorporate specific functionalities/active species without altering the framework topology [31], [32], [33] and [34].