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Citation: FAN Min-Guang, LI Bin, ZHANG Fei-Yue, LI Wang-Liang, XING Jian-Min, LIU Zi-Li. Distribution of Copper Ions in a CuLaHY Zeolite and Its Performance in Adsorption Desulfurization[J]. Acta Physico-Chimica Sinica, ;2009, 25(03): 495-501. doi: 10.3866/PKU.WHXB20090316 shu

Distribution of Copper Ions in a CuLaHY Zeolite and Its Performance in Adsorption Desulfurization

1.
College of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, P. R. China; Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, P. R. China

Received Date: 16 October 2008
Available Online: 7 January 2009

CuLaHY zeolite absorbents with different Cu loadings were prepared by the equal volume impregnation method under an air atmosphere. They were characterized by X-ray diffraction (XRD), BET surface area measurement, and X-ray photoelectron spectroscopy (XPS). The crystalline structure and distribution of Cu2+ and La3+ cations in the cages of the Y zeolite were determined by powder XRD. The performance of adsorption desulfurization for CuLaHY zeolite adsorbents was investigated using a model diesel containing dibenzothiophene (DBT). Results showed that a large amount of Cu from the precursor CuCl2 exchanged with the LaHY zeolite and entered the cages of the Y zeolite while a very small amount of Cu from the precursor CuCl2 was highly scattered in the cages of the Y zeolite in the formof CuCl. The La3+ cations and a portion of the Cu2+ cations entered the cages of the Y zeolite and situated at the SI' sites in the beta cages while another portion of the Cu2+ cations situated firmly at the SII and SIII sites in the supercages of the Y zeolites. They were coordinated to skeleton-oxygen atoms and water molecules. Cu2+ cations in the supercages can adsorb DBT molecules from the model diesel and thus become centers of adsorption desulfurization. However, naphthalene molecules will result in competitive adsorption with DBT molecules.
- CuLaHY,
- Zeolite absorbent,
- Characterization,
- Crystalline structure,
- Adsorption desulfurization
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