A strawsheave like metal organic framework Ce BTC derivative containing high specific surface area for improving the catalytic activity of CO oxidation reaction
Abstract A metal organic framework Ce BTC derivative with a special morphology and a large surface area was prepared by a simple method. Several analytical tools such as scanning electron microscopy (SEM) transmission electron microscope (TEM) X ray diffraction (XRD) fourier transform infrared (FT IR) N2 adsorption desorption (BET) H2 temperature programmed reduction (H2 TPR) ultraviolet visible diffuse reflectance spectrum (UV Vis DRS) photoluminescence (PL) X ray photoelectron spectroscopic (XPS) and elemental analysis (EA) have been used to characterize the samples. It is found that Ce BTC calcined with O2 at 250 degC (Ce BTC250) maintains the special strawsheave like structure, and the surface area rapidly increases from 42 m2 g 1 to 648 m2 g 1. Moreover, the prepared strawsheave like Ce BTC250 exhibited excellent catalytic activity, long term stability and water resistance. Further studies have shown that the MOF structure of Ce BTC250 was gradually converted to carbon free CeO2 during the catalytic reaction. Interestingly, the catalyst after the reaction still has a large surface area (124 m2 g 1) and the strawsheave like morphology. The improved catalytic activities may be due to the formation of porous and large surface area of strawsheave like Ce BTC derivative, which provided more active sites and oxygen vacancy for CO oxidation. This work provides a novel sight for preparing high efficient carbon free derivative with large surface area by controlling synthesis and reaction conditions of Ce based MOF.