Catalytic Combustion of Toluene over Highly Dispersed Cu-CeOx Derived from Cu-Ce-MOF by EDTA Grafting Method

Abstract

In this work, Cu-CeOx-MOF catalysts with well-dispersed Cu in different contents were synthesized via the ethylenediaminetetraacetic acid (EDTA) grafting method. EDTA was grafted in Ce-MOF-808 to anchor Cu and then the metal-organic frameworks (MOFs) were utilized as sacrificial template to form highly performed Cu-CeOx-MOF for toluene catalytic combustion. In this series of samples, Cu-CeOx-MOF-0.2 had a higher ratio of Oα/(Oα+Oβ), more oxygen vacancies and performed better low-temperature reducibility. Cu-CeOx-MOF-0.2 showed outstanding catalytic activity and stability. The T90 (temperature when toluene conversion achieved 90%) of Cu-CeOx-MOF-0.2 was 226 °C at 60,000 mL/(gcat∙h). In situ diffuse reflectance infrared transform spectroscopy (in situ DRIFTS) results revealed that the opening of aromatic ring and the deep oxidation of carboxylate were key steps for toluene catalytic combustion over Cu-CeOx-MOF-0.2.

Exploring novel heterojunctions based on the cerium metal–organic framework family and CAU-1, as dissimilar structures, for the sake of photocatalytic activity enhancement

“…46,47 Ce-MOF-808 is another synthesized MOF that possessed a diffraction peak at 2 θ = 8.14°, corresponding to the (311) plane, and another one at 2 θ = 8.5°, that represents the (222) plane. 48,49 The final MOF is Ce-BDC with two strong reflections at 2 θ = 9.6° and 2 θ = 9.9°, indicating high crystallinity like other mentioned MOFs. 50,51…”

“…46,47 Ce-MOF-808 is another synthesized MOF that possessed a diffraction peak at 2q = 8.14°, corresponding to the (311) plane, and another one at 2q = 8.5°, that represents the (222) plane. 48,49 The nal MOF is Ce-BDC with two strong reections at 2q = 9.6°and 2q = 9.9°, indicating high crystallinity like other mentioned MOFs. 50,51 The presence of functional groups was analyzed by Fouriertransform infrared (FT-IR) spectroscopy to further comprehend the structure of Ce-MOFs and their synthesized heterojunctions.…”

Co‐Electrodeposition of Nanostructured Ce‐NiOx on Stainless‐Steel Substrates for the Oxygen Evolution Reaction under Alkaline Conditions

“…Previous work on NiGe nanoparticles that were used as a precatalyst for the OER showed the formation of γ‐NiOOH when the material was electrochemically oxidized which was identified as the active site for the reaction. [ 73 ] Analysis of the SAED pattern reveals d spacings of 0.19 and 0.16 nm corresponding to CeO 2 (220) [ 74 ] and CeO 2 (311) [ 75 ] , respectively. This induced crystallinity due to the OER has been observed previously for other metal oxide/hydroxide catalysts such as Co(OH) 2 doped with Au nanoparticles [ 76 ] and reversible amorphous‐crystalline transitions have been observed for Co 3 O 4 nanomaterials.…”

In situ construction of halogen MOF bifunctional catalysts for synergistic removal of NO and Hg0

“…12,13 However, while the Cu-Ce-BTC catalyst excels in NO removal, its performance in Hg 0 removal is inadequate. 14 The surface of the Cu-Ce-BTC catalyst lacks significant oxidation groups and relies excessively on HCl in the gas phase, leading to SCR equipment damage. [15][16][17] Therefore, enhancing catalytic performance by introducing oxidation groups into the internal structure of the catalysts has become a research focus.…”