HKUST-1-Supported Cerium Catalysts for CO Oxidation

Abstract

The synthesis method of metal–organic frameworks (MOFs) has an important impact on their properties, including their performance in catalytic reactions. In this work we report on how the performance of [Cu3(TMA)2(H2O)3]n (HKUST-1) and Ce@HKUST-1 in the reaction of CO oxidation depends on the synthesis method of HKUST-1 and the way the cerium active phase is introduced to it. The HKUST-1 is synthesised in two ways: via the conventional solvothermal method and in the presence of a cationic surfactant (hexadecyltrimethylammonium bromide (CTAB)). Obtained MOFs are used as supports for cerium oxide, which is deposited on their surfaces by applying wet and incipient wetness impregnation methods. To determine textural properties, structure, morphology, and thermal stability, the HKUST-1 supports and Ce@HKUST-1 catalysts are characterised using X-ray diffraction (XRD), N2 sorption, scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FT-IR), and thermogravimetric analysis (TGA). It is proven that the synthesis method of HKUST-1 has a significant impact on its morphology, surface area, and thermal stability. The synthesis method also influences the dispersion and the morphology of the deposited cerium oxide. Last but not least, the synthesis method affects the catalytic activity of the obtained material.

Metal organic framework derived NaCoxOy for room temperature hydrogen sulfide removal

“…The HRXPS O 1s spectrum of CoBDC has four contributions at 531.5, 532.5, 533.7, and 535.4 eV for O–Co/O–Na, O–C=O, O–H, and H 2 O, respectively (Fig. S4 c) 42 . For CoBTC, the HRXPS C 1s spectrum deconvoluted into four peaks at 284.7, 285.9, 288.3, and 290.0 eV for C=C/C–H, C–O, –COOCo, and –COONa, respectively (Fig.…”

Host-Guest Interactions Between Metal–Organic Frameworks and Air-Sensitive Complexes at High Temperature

“…At higher temperatures of 170 and 200°C, the Fe(CO) 5 decompositions were significantly promoted, supplying atomic Fe and molecular CO to these systems. HKUST-1 backbone is stable with CO molecule to at least 210°C, ( Stawowy et al, 2020 ), therefore, the rapid destruction of MOFs shown in Figure 4 for 170–1 and 200–1 are mainly attributed to the strong reduction ability of atomic Fe. As the ligand reactivity difference between benzene-1,3,5-tricarboxylic acid in HKUST-1 and 2-amino terephthalic acid in NH 2 -MIL-101(Al) is almost negligible, the main reason for the different behavior of Fe(CO) 5 @HKUST-1 and Fe(CO) 5 @MIL-101(Al) can be concluded as the different reactivity of metal ions.…”

Composites of HKUST‐1@Nanocellulose for Gas‐Separation and Dye‐Sorption Applications

“…The O 1s peaks (Figure S10b and Table S1b) of HKUST-1 (B120) at binding energies 530.9, 532.4, 533.3 eV are assigned to CÀ OÀ Cu, OÀ C=O and OÀ H bonds, respectively. [56] The deconvoluted spectrum of O 1s (Figure S9b) of the HKUST-1@nanocellulose composite (C120) display five peaks with binding energies of 530.6, 531.4, 532.1, 532.8 and 533.4 eV designated to CÀ OÀ Cu, C=O, OÀ C=O, CÀ OH and OÀ H, respec-tively. These values are in accordance with the Cu@NC and the reference HKUST-1 (B 120).…”