Shan Honghong

Characterization of nitrogen compounds in coker gas oil by electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry and Fourier transform infrared spectroscopy

In this study, the classes and structures of nitrogen species in coker gas oil (CGO) are characterized by electrospray ionization (ESI) Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) combined with Fourier transform infrared (FT-IR) spectroscopy. The results demonstrate that the m/z of basic and non-basic nitrogen compounds ranges from 180 to 560 and from 200 to 460, respectively. Six basic nitrogen compounds, N1 (a molecule contains one nitrogen atom, similarly hereinafter), N1O1, N1O1S1, N1O2, N1S1, and N2, are identified by their positive-ion mass spectra, and four non-basic nitrogen compounds, N1, N1O1, N1S1, and N2, are characterized by their negative-ion mass spectra. Among these nitrogen compounds, the N1 class species are the most predominant. Combined with the data of ESI FT-ICR MS and FT-IR, the basic N1 class species are likely pyridines, naphthenic pyridines, quinolines, and benzoquinolines. The most non-basic N1 class species are derivatives of benzocarbazole. The N2 class species are likely amphoteric molecules with pyridine and pyrrole core structures.

Influence of the Copper Content of De-SOx Catalyst on Performance

AbstractA series of the Cu/MnMgAl mixed oxides were prepared by using the acid-processed gelatin method, characterized by Brunauer-Emmett-Teller (BET), X-ray diffraction (XRD), Fourier transform infrared (FT-IR), and transmission electron microscopy (TEM) techniques and applied as sulfur transfer catalysts under conditions similar to those of fluid catalytic cracking (FCC) units. The analysis of the SO2 abatement curves as a function of the copper content indicates that the reaction mechanism of SO2 uptake depends on two reversible surface processes (the chemisorptions of SO2 and its oxidation by copper ions) and a nearly irreversible process (bulk diffusion of the sulphate species). The results also show that the mixed oxides catalysts achieve the highest oxidative rate when they contain 11.1% (mol) copper (sample 10Cu/MnMgAl).