Co‐N‐C Catalysts Synthesized viaPyrolyzing the Ionic Liquids Solution Dissolved with Casein and Cobalt Porphyrin for Ethylbenzene Oxidation

Abstract

In order to enhance the dispersion of active centers and decrease the size of metal particles, cobalt-coordinated Ndoped carbon (Co-NÀC)with small particle size (3~8 nm) were synthesized via pyrolyzing a special homogenous solution, namely the mixture of casein and cobalt porphyrin dissolved in 1-butyl-3-methyllimidazolium chloride ionic liquid. And the catalysts have been characterized by N 2 adsorption-desorption isotherm, XRD, TEM, XPS and so on. The asprepared Co-NÀC exhibiteda remarkable catalytic performance (conversion of ethylbenzene reached 35.3 %) with molecular oxygen as oxidant under solvent-free conditions.Moreover, the best Co-NÀC showed superior cycling stability over 5 cycles. Those may be attributed to the well-dispersed acitve sites with small particle size and powerful CoÀN bond which effectively prevents metal particles from aggregation.

ZIF-Derived Co-Based Catalysts for Efficient Hydrogenation of Aromatic Compounds: the Study of the Co–Nx Active Sites

“…MOFs, which are usually prepared from self-assembly of metal ions and nitrogen-containing precursor by highly directional and functionalized ligands, have recently attracted attention due to their high specific surface area and tunable pore structure. , However, owing to the weak coordination bonding between metal nodes and organic ligands, MOFs are usually unstable in the catalytic reaction . It has been reported that MOFs can be converted to more steady porous materials than the original materials after pyrolysis treatment. − When MOFs are pyrolyzed at high calcination temperature in inert gas, the nitrogen element would build chemical bonds with the metal species to obtain highly uniform doped nitrogen species throughout the catalysts. Owing to their outstanding characteristics, MOF pyrolysis-derived materials have been applied in gas storage and separation, , electrochemical energy storage, catalysis, ,, and other aspects in recent years .…”

Solvent‐free selective oxidation of ethylbenzene with molecular oxygen catalyzed by cobalt catalysts supported on exfoliated carbon nitride

“…As previously reported by Jie et al, [46,48] such species are capable to interact with nitrogen atoms of nitrogen‐doped carbon materials, thus forming coordinate‐like Co−N x functionalities. On the other hand, it is widely revealed that compared with Co 3+ , Co 2+ possesses superior catalytic activity in oxidative reactions of EB [46,49] . Given this fact, it can be reasonably inferred that 3CoO x /eg‐C 3 N 4 ‐400 would demonstrate the highest activity in the following catalytic evaluation of EB oxidation.…”

“…On the other hand, it is widely revealed that compared with Co 3 + , Co 2 + possesses superior catalytic activity in oxidative reactions of EB. [46,49] Given this fact, it can be reasonably inferred that 3CoO x /eg-C 3 N 4 -400 would demonstrate the highest activity in the following catalytic evaluation of EB oxidation. Since the interaction between Co species and nitrogen of eg-C 3 N 4 support has been disclosed by UV-vis (Figure 5), in order to further elucidate the superficial chemical state of CoO x / eg-C 3 N 4 , the detailed analysis of N 1s spectra was conducted and the deconvoluted spectra are provided in Figure 8.…”

Full use of factors promoting catalytic performance of chitosan supported manganese porphyrin

“…immobilized metalloporphyrins and their catalysis systems [31][32][33][34][35] adapting to the cleaner production process. However, the resulting yields (acetophenone and phenylethanol (ONE + OL), less than 25%) were lower than those obtained from the catalytic systems above [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] . In addition, RSM was also seldom used in the catalytic field of metalloporphyrins [14][15][16][17]19,20,[31][32][33][34][35] .…”