Synthesis of C–N dual-doped Cr₂O₃ visible light-driven photocatalysts derived from metalorganic framework (MOF) for cyclohexane oxidation

Abstract

A series of novel C–N dual-doped Cr2O3 photocatalysts were synthesized from MIL-101(Cr), using a two-step method, including initial carbonization in nitrogen atmosphere without adding any carbon source and subsequent calcination in air.

High Surface Area of Polyhedral Chromia and Hexagonal Chromium Sulfide by the Thermolysis of Cyclohexylammonium Hexaisothiocyanatochromate(III) Sesquihydrate

“…[20,105] Furthermore, the synthesis of stable mesoporous material is preferred at high temperature. [62] The BET surface area of the synthesized mesoporous Cr 2 O 3 greatly exceeds the reported surface areas for Cr 2 O 3 of 37.9 m 2 g À 1 , [106] 23 m 2 g À 1 , [67] 27 m 2 g À 1 , [107] 81.05 m 2 g À 1 , [108] and 21.14 m 2 g À 1 ; [109] and the BET surface area of the obtained mesoporous Cr 2 S 3 surpasses the reported surface area of 9 m 2 g À 1 for Cr 2 S 3 , [72] making mesoporous Cr 2 O 3 and Cr 2 S 3 potential candidates for adsorption and catalysis applications.…”

“…Agglomeration was observed for the Cr 2 O 3 particles which demonstrated irregular polyhedron shapes (Figure 9). [62,67,68] This outcome was made possible due to the transportation of chromium oxide from smaller sized particles to ever increasingly larger sizes during the gas phase. [99] It is also well stablished that aggregation readily takes place in nanocrystals to decrease the high surface energy, leading to growth of clusters.…”

“…The applications of Cr 2 O 3 are varied in number and it is especially useful as catalyst, anode for lithium-ion batteries, hydrogen absorption, gas sensor, magnetic materials, pigments, and the production of paint products. [58][59][60][61][62][63][64][65][66][67][68] On the other hand, the industrial applications of Cr 2 S 3 have been realized in the manufacture of catalysts, supercapacitors, and energy storage devices. [69][70][71][72][73] between the theoretical and experimental results was within the acceptable error range, confirming the molecular formula of C 24 H 45 N 9 S 6 O 1.5 Cr for our synthesized hybrid organic-inorganic salt.…”

CeO2/Cr2O3 direct Z-scheme heterojunction for photo-thermal synergistic catalytic isopropanol degradation and nitrogen fixation

“…21 The other peak with a binding energy of 578.8 eV in Cr 2 O 3 was consistent with Cr 6+ 2p 3/2 . 22 According to the peak area calculation, the amount of Cr 6+ in Cr 2 O 3 was about 18.2%, while the amount of Cr 6+ in CC-500 increased to 25.6%. Because the Cr 6+ species possessed a strong oxidation ability, the increase of Cr 6+ species in CC-500 might be conducive to the deep oxidation of volatile organic compounds (VOCs).…”

Metal–Organic Framework-Derived Strategy for Improving Catalytic Performance of a Chromia-Based Catalyst in the Chlorine/Fluorine Exchange Reactions for Unsaturated Fluorocarbons

“…In recent years, metal–organic frameworks (MOFs) have gained significant attention as catalysts because of their ultrahigh surface area, crystalline nature, structural diversity, and tailorability. − More interestingly, MOFs can also be used as precursors or templates to derive various metal oxide/carbon nanocomposites by applying thermal treatments. − Compared with conventional nanomaterials, MOF-derived nanomaterials often exhibit controllable porous architectures and pore volumes, high surface areas, and high density of active sites . Thus, it is highly desirable to explore the method for fabricating nanoscopic Cl/F exchange catalysts with MOFs and research the performances of MOF-derived catalysts in the synthesis of HFOs and c-HFCs.…”