Superior performance of freeze-dried Ni/ZnO-Al 2 O 3 adsorbent in the ultra-deep desulfurization of high sulfur model gasoline

Ullah, Rooh; Peng, Peng; Wu, Pingping; Etim, U.J.; Zhang, Zhanquan; Han, Dezhi; Subhan, Fazle; Ullah, Saif; Rood, Mark J.; Zhang, Yan

doi:10.1016/j.fuproc.2016.10.022

Cited by 26 publications

(15 citation statements)

References 60 publications

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“…As can be seen, FT-IR spectra of the fresh adsorbents (Fig. S3a) show a series of transmission bands at 664, 881 and 1385 cm -1 , which are assigned to Zn-O stretching vibrations [20,53,54]. After RADS, the characteristic peaks of ZnS (Fig.…”

Section: Ft-ir Analysismentioning

confidence: 88%

“…In a typical synthesis, 2.32 g of (PEO) 20 (PPO) 70 (PEO) 20 (P123) was dissolved in 60 mL of deionized water, followed by the addition of 7.2 g of urea and 5.95 g of Zn(NO 3 ) 2 ·6H 2 O with continuous stirring for 30 min. Then, the solution was transferred into a stainless steel autoclave with a Teflon liner and crystallized in an oven at 100°C for different times (4, 8, 17 and 48 h).…”

Section: Materials Preparationmentioning

confidence: 99%

“…S3b) appear in all samples at around 623, 1049 and 1090 cm -1 . The band at 623 cm -1 is ascribed to the Zn-S stretching vibration [54,55], while that at 1049 cm -1 is assigned to the resonance interaction of S 2− on the ZnS crystals [20,54,56]. And the characteristic peak at around 1090 cm -1 is attributed to the stretching mode of ZnS [20,55].…”

Section: Ft-ir Analysismentioning

confidence: 99%

“…The band at 623 cm -1 is ascribed to the Zn-S stretching vibration [54,55], while that at 1049 cm -1 is assigned to the resonance interaction of S 2− on the ZnS crystals [20,54,56]. And the characteristic peak at around 1090 cm -1 is attributed to the stretching mode of ZnS [20,55]. Besides the characteristic Zn-O stretching bands, a peak at 1400 cm -1 assignable to the OH bending vibration in pure ZnO is observed for all spent samples, indicating the incomplete conversion of ZnO during the RADS process [53].…”

Section: Ft-ir Analysismentioning

confidence: 99%

“…It was found that Ni/Al 2 O 3 catalyst exhibited a better activity than that of catalyst Ni/ZnO, while Ni/ZnO exhibited a higher sulfur capacity due to the storage of H 2 S by ZnO, which opened ways for the design of adsorbents with high sulfur capacities. Following this pioneer work, a significant amount of efforts have been made for the development of Ni/ZnO based adsorbents [20][21][22]. By studying the desulfurization mechanism of thiophenic compounds [9,22,23], the RADS process using Ni/ZnO adsorbent was found to combine advantages of both HDS and adsorption desulfurization [24][25][26].…”

Section: Introductionmentioning

confidence: 99%

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Remarkably high performance of clew-like ZnO superstructure in reactive adsorption desulfurization

Peng

Liu

et al. 2017

Sci. China Mater.

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In this study, a clew-like ZnO superstructure was synthesized by a copolymer-controlled self-assembly homogeneous precipitation method. Ni was impregnated to the clew-like ZnO superstructure to obtain Ni/ZnO adsorbents. The synthesized materials were characterized by scanning electron microscopy, transmission electron microscopy, N 2 sorption, X-ray diffraction, Fourier transform infrared spectrometry, and H 2 -temperature programmed reduction techniques. The reactive adsorption desulfurization (RADS) performance of the adsorbents was evaluated in a fixed bed reactor using thiophene in n-octane as a model fuel. Sample Ni/ZnO-4h exhibits a remarkably high performance with a sulfur capacity of 189.1 mg S g -1 , which is above 6 times that of the one prepared with commercial ZnO. Characterization results show that the morphology changes from micro-clews to large solid sticks with the increase of the crystallization time.The loose and open architecture of the clew-like ZnO superstructure facilitates the diffusion of reactants/products, and prevents the adsorbent particles from breakage by supplying space for the volume expansion during the RADS process. The small nanoparticles in ZnO nanostrips result in a high sulfur adsorption capacity and also favor the dispersion of Ni, leading to an excellent RADS performance.

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Section: Ft-ir Analysismentioning

confidence: 88%

Section: Materials Preparationmentioning

confidence: 99%

Section: Ft-ir Analysismentioning

confidence: 99%

Section: Ft-ir Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Remarkably high performance of clew-like ZnO superstructure in reactive adsorption desulfurization

Peng

Liu

et al. 2017

Sci. China Mater.

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Highly stable Ni/ZnO‐Al₂O₃ adsorbent promoted by TiO₂ for reactive adsorption desulfurization

Liu

Peng

Yang

et al. 2021

EcoMat

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The reactive adsorption desulfurization is an important and efficient technology for the ultra‐deep desulfurization of gasoline. The performance of an adsorbent is vital for the efficiency of the reactive adsorption desulfurization process. The formation of inert spinels is commonly recognized for the deactivation of adsorbents. In this work, TiO2 was incorporated in the Ni/ZnO‐Al2O3 adsorbent to inhibit the formation of the spinel phase. The TiO2 formed a stable protection layer on the surface of Al2O3, which prevented the interaction between Al2O3 and ZnO, inhibiting the formation of the ZnAl2O4 spinel phase. The introduction of TiO2 significantly improved the stability of the adsorbents during cyclic hydrothermal treatments, while the sulfur capacity slightly dropped. Characterization results revealed that TiO2 was homogeneously dispersed on the surface of Al2O3 support and the incorporation of TiO2 could maintain a certain amount of Lewis acid sites in the adsorbents, which are favorable for the adsorption of organo‐sulfur compounds.

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An overview of adsorptive desulfurization of liquid transportation fuels over various adsorbents including zeolites

Yeole

2022

Env Prog and Sustain Energy

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The conventional technique of hydrodesulfurization (HDS) faces challenges while removing refractory sulfur compounds from liquid fuels. Alternative techniques are under exploration. One of the alternative techniques is adsorptive desulfurization (ADS). In ADS, an adsorbent is used to remove sulfur through physical or chemical adsorption. Moreover, it is possible at ambient conditions. Recent developments in the area of ADS is the focus of the present review. Various adsorbents have been assessed for ADS of the model and real feedstocks. These include both activated carbons and zeolites. Their modification through incorporation of metal ions can improve the performance. Present paper reviews recent progress regarding the development of adsorbents. Improvement of selectivity and stability along with regeneration and reuse too, reviewed. Regeneration studies are helpful in knowing the reusability of adsorbents. Various methods of regeneration such as thermal, solvent and their combination have been addressed. Thus, present paper covers modification, testing, regeneration and reuse of adsorbents for ADS of liquid fuels. Equilibrium, kinetic and thermodynamic studies relevant to chosen topic also reviewed. Challenges do exist in testing adsorbents for ADS of commercial fuels. These challenges arise due to the competitive adsorption between sulfur compounds and aromatics. For commercialization of ADS, the development of adsorbent with cheaper metal ions and ideal regeneration methods are essential.

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Superior performance of freeze-dried Ni/ZnO-Al 2 O 3 adsorbent in the ultra-deep desulfurization of high sulfur model gasoline

Cited by 26 publications

References 60 publications

Remarkably high performance of clew-like ZnO superstructure in reactive adsorption desulfurization

Remarkably high performance of clew-like ZnO superstructure in reactive adsorption desulfurization

Highly stable Ni/ZnO‐Al₂O₃ adsorbent promoted by TiO₂ for reactive adsorption desulfurization

An overview of adsorptive desulfurization of liquid transportation fuels over various adsorbents including zeolites

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Superior performance of freeze-dried Ni/ZnO-Al 2 O 3 adsorbent in the ultra-deep desulfurization of high sulfur model gasoline

Cited by 26 publications

References 60 publications

Remarkably high performance of clew-like ZnO superstructure in reactive adsorption desulfurization

Remarkably high performance of clew-like ZnO superstructure in reactive adsorption desulfurization

Highly stable Ni/ZnO‐Al2O3 adsorbent promoted by TiO2 for reactive adsorption desulfurization

An overview of adsorptive desulfurization of liquid transportation fuels over various adsorbents including zeolites

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Highly stable Ni/ZnO‐Al₂O₃ adsorbent promoted by TiO₂ for reactive adsorption desulfurization