Novel 1-substituted imidazole derivatives (4-10) were synthesized by imidazole and the corresponding substituted reagents (chloromethylpivalate, diphenylphosphinicchloride, di-tert-butyldicarbonate, 1,1 0 -oxalylchloride, pyrazine, phneylisocyanat, and p-toluensulfonylchloride). Polymerization of diglycidyl ether of bisphenol A (DGEBA) with 1-substituted imidazole derivatives, two commercial available catalysts (imidazole and 1-cyanoethyl-2-ethyl-4methylimidazole) and N-benzylpyrazinium hexafluoroantimonate were investigated as model reactions of epoxy resin systems with respect to the thermal latency and storage stability of the catalysts. The catalytic activity of 1-substituted imidazole derivatives 4-10 depended on the steric and withdrawing electronic effect of the substitution groups. To characterize the cure activation energy and the viscosity-storage time, the order of thermally latent activity is 1-tosylimidazole (6) > 1,1 0
A thermal plasma process for the recovery and reduction of the spent aluminasupported cobalt-molybdenum oxide catalyst (Co 3 O 4 -MoO 2 /Al 2 O 3 ) was developed. The spent catalyst was sintered at [1,500 K under plasma condition and the cobalt-molybdenum oxide therein was reduced to cobalt-molybdenum, which was proven by XRD and EDX. By application of SEM and GC technique, the organic tar on the surface of the spent catalyst was found to decomposed and converted to syngas (CO, CO 2 , and H 2 ), which might be the reducing agents in the process. A gasification mechanism for the generation of syngas and the reduction of cobalt-molybdenum oxide under plasma conditions was proposed.
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