New Type Nitrogen-Doped Carbon Material Applied to Deep Adsorption Desulfurization
Chun-Mei Deng, Mingyuan Zhu
Abstract
In this research, we have prepared a new type of multistage aperture nitrogen-doped carbon materials [CN-x, (x = 600, 700, 800, 900, 1000)] by one-step carbonization at different calcination temperatures. The structure of the CN-x is characterized by X-ray diffraction, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, Brunauer–Emmett–Teller, Scanning electron microscopy, and Raman spectroscopy. The effects of pore structure, nitrogen morphology, and defects on the adsorption properties are analyzed. We have also studied the desulfurization activity of CN-x for dibenzothiophene (DBT). Experimental data show that CN-900 has very good adsorption desulfurization activity, exhibiting a theoretical Langmuir adsorption capacity of up to 37.28 mg/g. When the DBT concentration is 100 ppm, CN-900 reaches a DBT removal rate of over 99%. The effects of calcination temperature and nitrogen content on the adsorption properties of the CN-x are examined. The experimental results show that the nitrogen content is positively correlated with the adsorption performance. The cheap and readily available d-(+)-glucosamine hydrochloride is used as the precursor of the CN-x, and the adsorbent prepared by a simple one-step carbonization method has good application prospects in the desulfurization process.