Design of Porous/Hollow Structured Ceria by Partial Thermal Decomposition of Ce-MOF and Selective Etching

Abstract

Metal-organic frameworks (MOFs) have been widely used to prepare corresponding porous metal oxides via thermal treatment. However, high temperature treatment always leads to obtained metal oxides with a large crystallite size, thus decreasing their specific surface area. Different from the conventional complete thermal decomposition of MOFs, herein, using Ce-MOF as a demonstration, we choose partial thermal decomposition of MOF, followed by selective etching to prepare porous/hollow structured ceria because of the poor stability of Ce-MOF under acidic conditions. Compared with the ceria derived from complete thermal decomposition of Ce-MOF, the as-prepared ceria is demonstrated to be a good support for copper oxide species during the CO oxidation catalytic reaction. Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and hydrogen temperature-programmed reduction (H-TPR) analysis revealed that the as-prepared ceria is favorable for strengthening the interaction between the ceria and loaded copper oxide species. This work is expected to open a new, simple avenue for the synthesis of metal oxides from MOFs via partial thermal decomposition.

Lithium–Lanthanide Bimetallic Metal–Organic Frameworks towards Negative Electrode Materials for Lithium‐Ion Batteries

“…The bond length of CeÀOi si nt he range from 2.381(2) to 2.735(2) ,w hich is roughlyc onsistentw ith other Ce-based MOFs. [27][28][29] Li + is linked by four oxygen atoms from four carboxylate groups of four different pmal igands ( Figure 1c)w ith bond lengths in the range of 1.929(7)-2.015(6) ( Table 2), which is consistent with the LiÀOb ond length in other compounds. [30] The more interesting phenomenon is that the nearest CeÀLi distance is about 3.559(6)-3.578(6) ,w hich suggests that some interaction exists between adjacent Ce and Li atoms.…”

Insights into the Pyrolysis Processes of Ce-MOFs for Preparing Highly Active Catalysts of Toluene Combustion

“…The textural properties were calculated based on the N 2 adsorption/desorption measurements, as listed in Table 1. It was shown that before pyrolysis, Ce-MOF-808 and Ce-UiO-66 exhibited large specific surface areas of 469.4 and 425.0 m 2 /g, respectively, while Ce-BTC possessed a specific surface area of 28.9 m 2 /g with small micropores [26]. The specific surface area values of Ce-MOF-808 and Ce-UiO-66 were lower than those previously reported [23,25].…”

“…The specific surface areas of MOF-808 and UiO-66 decreased greatly to 96.6 and 38.8 m 2 /g, respectively, while that of Ce-BTC increased to 71.5 m 2 /g. The increase of the Ce-BTC surface area was due to the formation of a porous structure after calcination [26].…”

Template Synthesis of Porous Ceria-Based Catalysts for Environmental Application

“…Artificial templating agents/precursors can be based on pure organics and polymers [ 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 ], silicon-organic compounds and mesoporous silica [ 27 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 ], metal-organic frameworks [ 42 , 43 ], synthetic carbon materials [ 44 , 45 , 46 , 47 ], etc.…”