Investigation of Cu(I)-Y zeolites with different Cu/Al ratios towards the ultra-deep adsorption desulfurization: Discrimination and role of the specific adsorption active sites

Zu, Yun; Guo, Zhongsen; Zheng, Jian; Yu, Hui; Wang, Sihua; Qin, Yucai; Zhang, Li; Liu, Honghai; Gao, Xionghou; Song, Lijuan

doi:10.1016/j.cej.2019.122319

Cited by 90 publications

(43 citation statements)

References 56 publications

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“…In addition, HDS is difficulty in removing aromatic sulfur molecules, such as dibenzothiophene (DBT) and 4,6‐dimethyldibenzothiophene (4,6‐DMDBT) . For making up the disadvantages of HDS technique, some non‐hydrodesulfurization techniques ( e. g. in situ sulfur removal, reactive adsorption desulfurization, oxidative desulfurization (ODS), alkylation desulfurization and selective adsorption desulfurization (SADS) are being developed as auxiliary methods. Among these technologies, SADS process is regarded as a promising “zero‐sulfur” technology owing to its mild conditions, good desulfurization performance, low cost, and minimal octane loss .…”

Section: Introductionmentioning

confidence: 99%

Effect of Content of Cerium Ion on Brönsted‐Acid‐Catalyzed Reaction of Thiophene over CeY Zeolite Studied by In Situ FTIR Spectroscopy

Qin

et al. 2019

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With NaY zeolite as the raw material, CeY zeolites with different content of Ce ions were prepared by liquid phase ion exchange (LPIE) method. Their chemical compositions were measured by X-ray fluorescence spectrometry (XRF) and in situ Fourier transform infrared spectroscopy (FTIR) techniques. Temperatureprogrammed desorption of ammonia (NH 3 -TPD) and FTIR spectra of pyridine (Py-FTIR) techniques were used to characterize acidity of CeY zeolites. With thiophene (TP, C 4 H 4 S) as probe molecule, adsorption and reaction of TP over CeY zeolites were researched by using in situ FTIR spectroscopy. Finally, it can be found that activity of Brönsted(B)-acid-catalyzed reaction of TP firstly increases and then has little change with the increase of concentration of Ce(NO 3 ) 3 solution (c), while increases with the increase of the exchange times by a combination of adsorption and reaction of TP over CeY zeolite with acidity of CeY zeolite and with location of Ce ion in CeY zeolite. Especially, the sulfurmetal (SÀ M) interaction between TP and Ce ion located in the supercage exhibits more influence than B-acid-catalyzed reaction of TP on adsorption desulfurization of CeY zeolite.[a] Z.

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Section: Introductionmentioning

confidence: 99%

Effect of Content of Cerium Ion on Brönsted‐Acid‐Catalyzed Reaction of Thiophene over CeY Zeolite Studied by In Situ FTIR Spectroscopy

Qin

et al. 2019

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“…[3] In order to reveal the effect of nature of Cu species, CuY zeolites with different Cu ion contents were prepared by traditional method. [38] The results show that excess Cu ion content will weaken sulfur adsorption capacity of CuY zeolite due to the reduction of Cu + ion content and the increase of the polymerization of Cu species.…”

Section: Introductionmentioning

confidence: 93%

“…the metallic Cu 0 atom + H + , respectively. [21,38,62,63] The reduction peak at about 390°C assigned to CeO 2 on the surface of CeY zeolite is absent. [21,45] Based on results of literatures, the reduction peaks at 188 and 247°C can be attributed to reduction steps of the Cu 2 + ion species located in the supercage, while at 304°C can be preliminarily attributed to reduction steps of the dehydrated Cu 2 + ion species located in the sodalite cage, respectively.…”

Section: The Locations Of Cu and Ce Ionsmentioning

confidence: 99%

“…Besides, the maximum Q value of CuCeY zeolites for TMO is lower than that of CuY zeolites obtained through autoreduction at high temperatures under a N 2 atmosphere. [38,42] It means that adsorptive capacity of CuCeY zeolite for sulfur compounds has the room for improvement. It may be enhanced by further optimizing preparation conditions CuCeY zeolites, such as using the NH 4 Y zeolite as the raw material and thus increasing the ion exchange degree, [43] altering the Si/Al ratio of Y zeolite, [42] adjusting the pH value [42,44] and concentration [3,38,45] of nitrate solution, changing the temperature and atmosphere of calcination, [3,21,39,46] and enlarging the pore diameter of Y zeolite.…”

Section: Desulfurization Performance Of Adsorbentmentioning

confidence: 99%

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Enhanced Adsorption Desulfurization Performance over CuCeY Zeolites Prepared by Low‐Temperature Calcination under H₂ Atmosphere

Wang

et al. 2020

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In order to optimize the location and valence state of metal ions in the Y‐type zeolite, the bimetallic (cerium and copper) modified NaY (CuCeY) zeolites with different Cu/Ce ratios were prepared by calcination at 180 °C under H2 atmosphere. Their adsorptive capacity and selectivity for thiophene were preliminarily explored. Furthermore, the CuCeY zeolites were characterized by various techniques for explaining their adsorption behaviors. The obtained results show that the breakthrough adsorption sulfur capacity (Q) of CuCeY zeolites from model oil contains thiophene (TMO) shows a volcanic tendency with the increase of Cu ion contents in zeolites. This is because more metal ions, especially Cu+ ions, are distributed to the supercages of Y zeolites. When 1‐hexene coexists with thiophene in model oil (TOMO), the Q of CuCeY zeolites increase firstly and then remain almost unchanged as Cu ion contents in zeolites increases. It is related to competitive adsorption, alkylation and oligomerization of thiophene and 1‐hexene. When benzene coexists with thiophene in model oil (TAMO), the Q of CuCeY zeolites are linear with Cu ion contents in zeolites. This is possible because the competitive adsorption between olefins and sulfur compounds on Cu ions or weak Brönsted(B) acid centers are stronger than that between aromatics and sulfur compounds on the same adsorption sites. It′s worth mentioning that the Q values of CuCeY zeolites are larger than that of bimetallic modified CuCeY zeolites and that of most of monometallic modified Y zeolites reported in the references.

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“…However, to achieve deep desulfurization, HDS needs to utilize very severe conditions because aromatic sulfur compounds, such as thiophene and its derivatives, are particularly difficult to treat by conventional HDS. Adsorptive desulfurization (ADS) is considered to be an efficient and economic technology for the selective removal of thiophene and its derivatives because of its particular advantages, such as operating under mild conditions, not changing the performance of oil products and environmental friendliness (Subhan et al 2018a, b;Li et al 2017;Zu et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Synthesis of highly active Cu(I)-Y(III)-Y zeolite and its selective adsorption desulfurization performance in presence of xylene isomers

Jiang

Chang³

2020

Pet. Sci.

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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.

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Investigation of Cu(I)-Y zeolites with different Cu/Al ratios towards the ultra-deep adsorption desulfurization: Discrimination and role of the specific adsorption active sites

Cited by 90 publications

References 56 publications

Effect of Content of Cerium Ion on Brönsted‐Acid‐Catalyzed Reaction of Thiophene over CeY Zeolite Studied by In Situ FTIR Spectroscopy

Effect of Content of Cerium Ion on Brönsted‐Acid‐Catalyzed Reaction of Thiophene over CeY Zeolite Studied by In Situ FTIR Spectroscopy

Enhanced Adsorption Desulfurization Performance over CuCeY Zeolites Prepared by Low‐Temperature Calcination under H₂ Atmosphere

Synthesis of highly active Cu(I)-Y(III)-Y zeolite and its selective adsorption desulfurization performance in presence of xylene isomers

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Investigation of Cu(I)-Y zeolites with different Cu/Al ratios towards the ultra-deep adsorption desulfurization: Discrimination and role of the specific adsorption active sites

Cited by 90 publications

References 56 publications

Effect of Content of Cerium Ion on Brönsted‐Acid‐Catalyzed Reaction of Thiophene over CeY Zeolite Studied by In Situ FTIR Spectroscopy

Effect of Content of Cerium Ion on Brönsted‐Acid‐Catalyzed Reaction of Thiophene over CeY Zeolite Studied by In Situ FTIR Spectroscopy

Enhanced Adsorption Desulfurization Performance over CuCeY Zeolites Prepared by Low‐Temperature Calcination under H2 Atmosphere

Synthesis of highly active Cu(I)-Y(III)-Y zeolite and its selective adsorption desulfurization performance in presence of xylene isomers

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Enhanced Adsorption Desulfurization Performance over CuCeY Zeolites Prepared by Low‐Temperature Calcination under H₂ Atmosphere