Benzothiophene hydrodesulfurization over NiMo/alumina catalysts modified by citric acid. Effect of addition stage of organic modifier

Escobar, José; Barrera, María C.; Gutierrez, Arnaud; Terrazas, José E.

doi:10.1016/j.fuproc.2016.09.028

Cited by 53 publications

(24 citation statements)

References 55 publications

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“…Due to the importance of HDS and HDN processes and also economical-environmental issues associated with it, tremendous efforts have been devoted to the development of novel catalysts with high yields. NiMo and CoMo catalysts on various supports are among the most studied catalysts (Zdražil 2003;Yamamoto et al 2007;Vonortas and Papayannakos 2014;Bui et al 2015;Klimov et al 2016;Liu et al 2016;Zepeda et al 2016;Escobar et al 2017;Hajjar et al 2017a, b;Maximov et al 2017;Xu et al 2017;Zhou et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Comparison of performance of Ni–Mo/γ-alumina catalyst in HDS and HDN reactions of main distillate fractions

2019

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A bimetallic nickel-molybdenum catalyst supported on γ-alumina was synthesized by the two-step incipient wetness impregnation technique. The activity of the prepared Ni-Mo/γ-alumina catalyst was evaluated in a down flow fixed-bed microreactor. In this way, hydrodesulfurization (HDS) and hydrodenitrogenation (HDN) reactions of the main distillate fractions of crude oil were assessed. XRD, SEM, TPR, ICP-OES, BET-BJH and nitrogen adsorption/desorption methods were used for characterizing the synthesized Ni-Mo/γ-alumina catalyst. The active metals with Ni/Mo mass ratio of 0.23 and total metal of 13.7 wt% were loaded on the support, similar to the commercial industrial catalyst. The performance tests were conducted at 3.0 MPa (for light naphtha and heavy naphtha) and at 4.5 MPa (for kerosene and gas oil). The results revealed that the total sulfur conversion of the light naphtha, heavy naphtha, kerosene and gas oil fractions was 98.3%, 95%, 91.7% and 90.1% (after 24 h), respectively.

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Section: Introductionmentioning

confidence: 99%

Comparison of performance of Ni–Mo/γ-alumina catalyst in HDS and HDN reactions of main distillate fractions

2019

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“…Over the years, it has been studied how to improve the activity of HT catalysts, by incorporating different additives [14][15][16][17][18][19][20][21]. Similarly, in the case of adsorbent systems, different additives have been studied to improve adsorption capacity [6,22,23].…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Adsorption of 4,6-Dimethyldibenzothiophene and Quinoline over Nickel and Boron Modified Gamma-Al2O3 Adsorbent

et al. 2020

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The simultaneous adsorption of quinoline and 4,6-dimethyldibenzothiophene over adsorbents, based on alumina modified with boron and nickel under ambient temperature and pressure, was studied. The adsorbents were characterized by BET specific surface area, a potentiometric method for the determination of acid strength, electrophoretic migration, and X-ray diffraction. The results showed that the adsorbent containing nickel had better adsorption capacity than the adsorbent modified with nickel and boron, which was attributed to its greater acidity and ability to generate π-complexation between the adsorbent and the molecules. In terms of selectivity, quinoline was more adsorbed than 4,6-dimethyldibenzothiophene in all systems, due to the basic nature of quinoline. The experimental data in all cases were adjusted by three kinetic models (Yoon–Nelson, Yan and Thomas), and the regression coefficients in all models were close to one. Finally, the values of the kinetic constant obtained by the Thomas model were used to relate the adsorption capacity results.

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“…The active phases of the catalysts are distributed over the support materials to improve the activity and exposure of the active sites to the target molecules. The main catalyst supports include Al 2 O 3 (Ayala-Gomez et al 2015;Escobar et al 2017;Nikulshin et al 2014), SiO 2 (Xu et al 2017), MgO (Zdražil 2003) and TiO 2 (Saih et al 2005;Santes et al 2004), with low specific surface area and low pore volume.…”

Section: Introductionmentioning

confidence: 99%

“…The successful hydrotreating (HDT) catalysts are composed of the active phase and the catalyst support, where NiMo (Escobar et al 2017;Liu et al 2016;Xu et al 2017;Zepeda et al 2016;Zhou et al 2017) and CoMo (Bui et al 2015;Khorami and Kalbasi 2011;Vonortas and Papayannakos 2014;Zdražil 2003) have been the most studied active phases. Liu et al (2016) studied the HDS of dibenzothiophene over ordered mesoporous NiMo/Al 2 O 3 and reported that high HDS activity was observed for the Ni/Mo molar ratio of 1:1.…”

Section: Introductionmentioning

confidence: 99%

“…They have reported that the NiMo/TiO 2 -Al 2 O 3 catalysts have better performance than the NiMo/Al 2 O 3 catalysts (Saih et al 2005). In research performed by Escobar et al (2017), the NiMo/alumina catalyst was modified by citric acid and utilized for HDS of benzothiophene for which it was found that impregnation of the alumina by citric acid before the addition of the active phase yields the highest activity. Xu et al (2017) synthesized the NiMo/SiO 2 -Al 2 O 3 HDS catalysts which showed high activity for HDS of 4,6-dimethyldibenzothiophene FCC diesel.…”

Section: Introductionmentioning

confidence: 99%

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Effect of graphene functionalizing on the performance of NiMo/graphene in HDS and HDN reactions

2019

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In this research, to remove sulfur and nitrogen compounds from heavy naphtha, various nanocatalysts were prepared through supporting NiMo over nanoporous graphene and evaluated in hydrodesulfurization and hydrodenitrogenation reactions. The nanoporous graphene was initially functionalized in order to facilitate the metal being loaded on it. Three different methods were used to functionalize the nanoporous graphene. The NiMo/nanoporous graphene nanocatalysts were characterized by field emission scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, inductively coupled plasma optical emission spectrometry, temperature-programmed reduction, nitrogen adsorption-desorption isotherms and transmission electron microscopy techniques. Catalyst performance was evaluated in terms of conversions of sulfur, mercaptans (R-SH) and nitrogen compounds. It was found that the functionalized nanoporous graphene support could significantly enhance the catalytic performance in comparison with the industrial NiMo/alumina catalyst. Among the functionalized graphene supports, amine-functionalized graphene exhibited the best results. By using NiMo supported over amine-functionalized graphene, the conversions of total sulfur and R-SH reached 97.8% and 98.1%, respectively.

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Benzothiophene hydrodesulfurization over NiMo/alumina catalysts modified by citric acid. Effect of addition stage of organic modifier

Cited by 53 publications

References 55 publications

Comparison of performance of Ni–Mo/γ-alumina catalyst in HDS and HDN reactions of main distillate fractions

Comparison of performance of Ni–Mo/γ-alumina catalyst in HDS and HDN reactions of main distillate fractions

Simultaneous Adsorption of 4,6-Dimethyldibenzothiophene and Quinoline over Nickel and Boron Modified Gamma-Al2O3 Adsorbent

Effect of graphene functionalizing on the performance of NiMo/graphene in HDS and HDN reactions

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