Abstract

A bimetal-exchanged NaY zeolite (Cu(I)-Y(III)-Y) with a desirable adsorptive desulfurization (ADS) performance was prepared and characterized by means of X-ray diffraction, specific surface area measurements, X-ray fluorescence spectrometer, X-ray photoelectron spectroscopy, thermal gravity analysis and Fourier transform infrared spectroscopy. The effect of Y(III) ions on ADS in the presence of the xylenes was investigated. Results indicated that the ADS performance of Y(III)-Y is higher than that of most reported CeY. The Y(III)-based Cu(I)-Y(III)-Y demonstrated the higher breakthrough loading than those of reported Ce(III)/Ce(IV)-based transition metal Y zeolites, showing that Y(III) ions play a promoting role in improving the ADS selectivity. For Cu(I)-Y(III)-Y, a new strong S-M interaction (S stands for sulfur, while M stands for metal) active site was formed, which might be caused by the synergistic effect between Cu(I) and Y(III). The Cu(I)-Y(III)-Y, which combined the advantages of Cu(I)-Y and Y(III)-Y, is a kind of promising adsorbent. The breakthrough loading decreased in the order of Cu(I)-Y(III)-Y > Y(III)-Y > Cu(I)-Y, and the effect of xylene isomers on the sulfur removal was in the order of ortho-xylene > meta-xylene > para-xylene, which exhibited the same trend with the bond order of xylenes.

中文翻译：

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高活性Cu（I）-Y（III）-Y沸石的合成及其在二甲苯异构体存在下的选择性吸附脱硫性能

摘要

制备了具有理想吸附脱硫（ADS）性能的双金属交换NaY沸石（Cu（I）-Y（III）-Y）并通过X射线衍射，比表面积测量，X射线荧光光谱仪进行了表征，X射线光电子能谱，热重分析和傅里叶变换红外光谱。研究了二甲苯存在下Y（III）离子对ADS的影响。结果表明，Y（III）-Y的ADS性能高于大多数报道的CeY。基于Y（III）的Cu（I）-Y（III）-Y的穿透负荷高于已报道的基于Ce（III）/ Ce（IV）的过渡金属Y沸石的穿透负荷，表明Y（III）离子在提高ADS选择性方面起促进作用。对于Cu（I）-Y（III）-Y，新的强SM相互作用（S代表硫，而M代表金属）形成了活性位点，这可能是由于Cu（I）和Y（III）之间的协同作用引起的。结合了Cu（I）-Y和Y（III）-Y优点的Cu（I）-Y（III）-Y是一种很有前途的吸附剂。突破负荷按Cu（I）-Y（III）-Y> Y（III）-Y> Cu（I）-Y的顺序降低，二甲苯异构体对脱硫的影响顺序为邻位-二甲苯>间二甲苯>对二甲苯，与二甲苯的键序显示出相同的趋势。