title: Competitive adsorption desulfurization performance over K - Doped NiY zeolite.
abstract: NiY and KNiY were successfully prepared by impregnation method and characterized by X-ray diffraction (XRD), N2 sorption (BET), scanning electron microscope (SEM), infrared spectrum (IR) and X-ray Photoelectron Spectroscopy (XPS). The competitive adsorption mechanisms of adsorbents were studied by in situ FTIR to explain different desulfurization performance which was evaluated in a miniature fixed-bed flow by gasoline model compounds with 1-hexene or toluene. NiY and KNiY adsorbents showed better desulfurization performance than HY zeolite due to the high selectivity of loaded active metals. Especially, KNiY adsorbent showed its advantages in desulfurization performance with 5vol% olefins or 5vol% aromatics involvement. It could be assigned that introduced K cation enhanced dispersion and content of active Ni species on the surface which made Ni species reduce easily. On the other hand, adsorption mechanisms showed that the protonation reactions of thiophene and 1-hexene occurred on the Brönsted acid sites of NiY, which resulted in pore blockage and the coverage of adsorption active centers. By doping K cation on NiY, the amount of the Brönsted acid sites of NiY was decreased and protonation reactions were weaken. Therefore, the negative effects of Brönsted acid sites were reduced.
authors.affiliation: State Key Laboratory of Heavy Oil Processing, China University of Petroleum (Beijing), 18 Fuxue Road, Beijing 102249, PR China.
authors.forename: Haizheng
authors.initials: H
authors.lastname: Li
authors.affiliation: State Key Laboratory of Heavy Oil Processing, China University of Petroleum (Beijing), 18 Fuxue Road, Beijing 102249, PR China.
authors.forename: Xiaona
authors.initials: X
authors.lastname: Han
authors.affiliation: State Key Laboratory of Heavy Oil Processing, China University of Petroleum (Beijing), 18 Fuxue Road, Beijing 102249, PR China.
authors.forename: Haokai
authors.initials: H
authors.lastname: Huang
authors.affiliation: State Key Laboratory of Heavy Oil Processing, China University of Petroleum (Beijing), 18 Fuxue Road, Beijing 102249, PR China.
authors.forename: Yuxian
authors.initials: Y
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Heavy Oil Processing, China University of Petroleum (Beijing), 18 Fuxue Road, Beijing 102249, PR China. Electronic address: liangzhao@cup.edu.cn.
authors.forename: Liang
authors.initials: L
authors.lastname: Zhao
authors.affiliation: State Key Laboratory of Heavy Oil Processing, China University of Petroleum (Beijing), 18 Fuxue Road, Beijing 102249, PR China.
authors.forename: Liyuan
authors.initials: L
authors.lastname: Cao
authors.affiliation: State Key Laboratory of Heavy Oil Processing, China University of Petroleum (Beijing), 18 Fuxue Road, Beijing 102249, PR China.
authors.forename: Baojian
authors.initials: B
authors.lastname: Shen
authors.affiliation: State Key Laboratory of Heavy Oil Processing, China University of Petroleum (Beijing), 18 Fuxue Road, Beijing 102249, PR China.
authors.forename: Jinsen
authors.initials: J
authors.lastname: Gao
authors.affiliation: State Key Laboratory of Heavy Oil Processing, China University of Petroleum (Beijing), 18 Fuxue Road, Beijing 102249, PR China.
authors.forename: Chunming
authors.initials: C
authors.lastname: Xu
keywords: Adsorption desulfurization; Competitive adsorption mechanism; In situ FTIR; KNiY; NiY