Catalytic oxidative desulfurization of gasoline using phosphotungstic acid supported on MWW zeolite

doi:10.1007/s11705-019-1842-z

Front. Chem. Sci. Eng.

2020, Vol. 14

Issue (4) : 546-560 https://doi.org/10.1007/s11705-019-1842-z

RESEARCH ARTICLE

Catalytic oxidative desulfurization of gasoline using phosphotungstic acid supported on MWW zeolite

Hanlu Wang, Idris Jibrin, Xingye Zeng(

)

College of Chemical Engineering, Guangdong University of Petrochemical Technology, Maoming 525000, China

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Abstract

Catalysts for the desulfurization of gasoline samples were synthesized via the immobilization of well-dispersed phosphotungstic acid (HPW) on Mobil composition of matter-twenty-two (MWW) zeolite. Characterization results indicated that these catalysts possess a mesoporous structure with the retention of the Keggin structure of immobilized HPW. Relevant reaction parameters inﬂuencing sulfur removal were systematically investigated, including HPW loading, catalyst dosage, temperature, initial S-concentration, molar ratio of oxidant to sulfide (O/S), volume ratio of MeCN to model oil (Ext./oil), and sulfide species. The 40 wt-% HPW/MWW catalyst exhibited the highest catalytic activity with 99.6% dibenzothiophene sulfur removal from prepared samples. The 40 wt-% HPW/MWW catalyst was recycled four times and could be easily regenerated. Finally, as an exploratory study, straight-run-gasoline and fluid catalytic cracking gasoline were employed to accurately evaluate the desulfurization performance of 40 wt-% HPW/MWW. Our research provides new insights into the development and application of catalysts for desulfurization of gasoline.

Keywords oxidative desulfurization phosphotungstic acid MWW wet impregnation adsorption energy

Corresponding Author(s): Xingye Zeng

Just Accepted Date: 15 October 2019 Online First Date: 29 November 2019 Issue Date: 22 May 2020

Cite this article:

Hanlu Wang,Idris Jibrin,Xingye Zeng. Catalytic oxidative desulfurization of gasoline using phosphotungstic acid supported on MWW zeolite[J]. Front. Chem. Sci. Eng., 2020, 14(4): 546-560.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-019-1842-z
https://academic.hep.com.cn/fcse/EN/Y2020/V14/I4/546

Tab.1 Structural parameters of MWW and HPW/MWW

Fig.1 N₂ adsorption-desorption isotherms for a range of HPW-loaded MWW catalysts.

Fig.2 (a) XRD and (b) FT-IR spectra of MWW and HPW/MWW with a range of HPW loadings.

Fig.3 TEM images of HPW-MWW-40.

Fig.4 (a) Survey XPS spectra of HPW and HPW-MWW-40, (b) High-resolution XPS spectra of W 4f for HPW and HPW-MWW-40, and (c) High-resolution XPS spectra of O 1s for HPW and HPW-MWW-40.

Fig.5 Scheme 1 Schematic mechanism for the formation of HPW-supported MWW zeolite.

Fig.6 Effects of different reaction conditions on sulfur removal: (a) HPW loading, (b) HPW-MWW-40 quantity, (c) temperature, (d) S-concentration, (e) O/S, and (f) Ext./oil.

Tab.2 Comparisons of DBT removal performance for HPW-supported heterogeneous catalysts with other studies

Fig.7 (a) Effects of different ASCs on sulfur removal. Reaction conditions: T = 60°C, O/S= 4:1, model oil= 10 mL, MeCN= 5 mL, and m(HPW/MWW-40) = 0.03 g, and t = 50 min. DE_ads and structural models of HPW and (b) BT, (c) DBT, and (d) 4,6-DMDBT.

Fig.8 (a) HPW/MWW-40 recycling and (b) regeneration. Reaction conditions: T = 60°C, O/S= 4:1, model oil= 10 mL, MeCN= 5 mL, m(HPW/MWW-40) = 0.03 g, and t = 50 min.

Fig.9 SEM and EDS of HPW/MWW-40: (a) before reaction, (b) after four runs, and (c) after regeneration.

Fig.10 GC-MS spectra after ODS.

Fig.11 Various S-compounds and their amounts (a) before ODS of SRG; (b) after ODS of SRG; (c) before ODS of FCC; (d) after ODS of FCC gasolines. Details for S-compounds corresponding to the abscissa value are given in Tables S1 and S2 (cf. Electronic Supplementary Material).

Tab.3 Key components of SRG and FCC gasoline

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[1]	Hua Zhao,Gary A. Baker. Oxidative desulfurization of fuels using ionic liquids: A review? ?[J]. Front. Chem. Sci. Eng., 2015, 9(3): 262-279.
[2]	Liyan LIU, Yu ZHANG, Wei TAN. Synthesis and characterization of phosphotungstic acid/activated carbon as a novel ultrasound oxidative desulfurization catalyst[J]. Front Chem Sci Eng, 2013, 7(4): 422-427.

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