[O]-induced reactive adsorptive desulfurization of liquid fuel over Ag X O@SBA-15 under ambient conditions

Ye, Feiyan; Miao, Guang; Wu, Liqiong; Wu, Ying; Li, Zhong; Chen, Song; Xiao, Jing

doi:10.1016/j.ces.2017.04.032

Cited by 21 publications

(16 citation statements)

References 59 publications

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“…The presence of Ag 0 in regenerated samples was further confirmed in XPS (Fig. 6), though Ag 0 was also detected in the fresh sample via XPS, which was attributed to the fact that nanosize silver species in Ag X O@SBA-15 are readily reduced to the elemental Ag 0 at high vacuum (10 -7 Pa for 6 h pretreatment in XPS, as stated in our previous work) (Ye et al 2017). In the latter regeneration runs, the desulfurization capacity decreased slightly, because the mild aggregation of Ag 0 particles resulted in a gentle decrease in adsorption capacity of BT.…”

Section: Sorbent Characterizationssupporting

confidence: 78%

“…In our previous work, the bifunctional Ag X O@SBA-15 adsorbent for [O]-induced reactive adsorption desulfurization (RADS) was reported, and the desulfurization capacity reached 2.62 mg-S/g with the addition of air under ambient conditions (Ye et al 2017). The RADS mechanism of Ag X O@SBA-15 illustrated that the thiophenic compounds can be oxidized to sulfones by oxidative nanosize [O]retaining AgO on SBA-15 (the AgO transforms to Ag 2 O after desulfurization) in the absence of air or by the resulting or existing catalytic nanosize Ag 2 O and Ag (in small amounts) in the presence of air.…”

Section: Adsorbent Regenerationmentioning

confidence: 99%

“…Beyond that, we recently demonstrated an [O]-induced reactive adsorptive desulfurization (RADS) approach using bifunctional Ag X-O@SBA-15 adsorbent under ambient conditions. High desulfurization capacity and selectivity, as well as a high kinetic rate for deep desulfurization, were achieved (Ye et al 2017). However, questions remain on how to regenerate the Ag X O@SBA-15 adsorbent and how it behaves in multiple runs.…”

Section: Introductionmentioning

confidence: 99%

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Regeneration of AgXO@SBA-15 for reactive adsorptive desulfurization of fuel

Miao

et al. 2018

Pet. Sci.

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Adsorbent regeneration is critical for a continuous adsorption-regeneration process and often underestimated. In this work, the regeneration of bifunctional Ag X O@SBA-15 for [O]-induced reactive adsorptive desulfurization of liquid fuel is reported and further investigated. The spent Ag X O@SBA-15 was regenerated in various types of solvents followed by calcination and tested in multiple desulfurization-regeneration cycles. The effects of regenerate solvents were also compared systematically. The original and regenerated Ag X O@SBA-15 was characterized by X-ray diffraction, transmission electron microscopy, energy-dispersive X-ray spectroscopy, N 2 adsorption, X-ray photoelectron spectroscopy and atomic absorption spectrometry. The recovery of desulfurization capacity using various solvents follows the order of acetonitrile [ acetone [ ethanol [ methanol [ water. Owing to the complete reduction of silver species to Ag 0 and severe agglomeration of Ag 0 , the bifunctional Ag X O@SBA-15 demonstrating [ 85% (2.60 mg-S/g) of sulfur removal dramatically reduced to \ 46% (1.56 mg-S/g) after only 1st-cycle regeneration. It is suggested that polar organic species strongly adsorbed (or residual) on the spent Ag X O@SBA-15, in that case, after solvent wash may contribute to the accelerated decomposition of Ag ? to Ag 0 in the following calcination step. The desulfurization capacity decreased rather mildly in the later regeneration runs. Cautious choice of regeneration conditions and strategies to rational design stabilized adsorbents is required to avert the adsorbent deactivation.

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Section: Sorbent Characterizationssupporting

confidence: 78%

Section: Adsorbent Regenerationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Regeneration of AgXO@SBA-15 for reactive adsorptive desulfurization of fuel

Miao

et al. 2018

Pet. Sci.

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“…Moreover, supported silver oxides or silver can also act as oxidative catalysts in the epoxidation of alkenes [162][163][164], aldehydes [165], and various organic compounds [166] and carbon oxide [167]. The capability of silver oxides to contemporarily perform as active catalytic species and adsorption phases has been applied in the ODS procedure by preparation of novel Ag x O-SBA-15 materials and their use in the adsorption/oxidation of BT, DBT, 4-MDBT and 4,6-DMDBT, as model fuel compounds [168]. Ag x O-SBA-15 catalysts were prepared by an ultrasound-assisted impregnation process of SBA-15 and AgNO 3 water solutions at different concentration.…”

Section: Silver Oxidesmentioning

confidence: 99%

SBA-15 Anchored Metal Containing Catalysts in the Oxidative Desulfurization Process

2019

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Recalcitrant sulfur compounds are common impurities in crude oil. During combustion they produce SOx derivatives that are able to affect the atmospheric ozone layer, increasing the formation of acid rains, and reducing the life of the engine due to corrosion. In the last twenty years, many efforts have been devoted to develop conventional hydrodesulfurization (HDS) procedures, as well as alternative methods, such as selective adsorption, bio-desulfurization, oxidative desulfurization (ODS) under extractive conditions (ECODS), and others. Among them, the oxidative procedures have been usually accomplished by the use of toxic stoichiometric oxidants, namely potassium permanganate, sodium bromate and carboxylic and sulfonic peracids. As an alternative, increasing interest is devoted to selective and economical procedures based upon catalytic methods. Heterogeneous catalysis is of relevance in industrial ODS processes, since it reduces the leaching of active species and favors the recovery and reuse of the catalyst for successive transformations. The heterogenization of different types of high-valent metal transition-based organometallic complexes, able to promote the activation of stoichiometric benign oxidants like peroxides, can be achieved using various solid supports. Many successful cases have been frequently associated with the use of mesoporous silicas that have the advantage of easy surface modification by reaction with organosilanes, facilitating the immobilization of homogeneous catalysts. In this manuscript the application of SBA-15 as efficient support for different active metal species, able to promote the catalytic ODS of either model or real fuels is reviewed, highlighting its beneficial properties such as high surface area, narrow pore size distribution and tunable pore diameter dimensions. Related to this topic, the most relevant advances recently published, will be discussed and critically described.

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“…However, since all these catalysts are presented in powder forms, making them difficult to be separated from fuel oil [46] . Moreover, molding of the catalysts to form integral catalysts is seriously limited by the technology and costs [47] . Both the disadvantages make the developed catalysts difficult to be utilized industrially.…”

Section: Introductionmentioning

confidence: 99%