Synthesis of novel NiMo catalysts supported on highly ordered TiO2-Al2O3 composites and their superior catalytic performance for 4,6-dimethyldibenzothiophene hydrodesulfurization

Zhou, Wenwu; Yang, Li; Liü, Lang; Chen, Zhiping; Zhou, Anning; Zhang, Yating; He, Xinfu; Shi, Faxiang; Zhao, Zegao

doi:10.1016/j.apcatb.2019.118428

Cited by 58 publications

(49 citation statements)

References 66 publications

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“…The incorporation of Ti into the support provides a stronger MSI, allowing an improved dispersion of the Ni and especially Mo oxides (see the SEM images in Figure 5b). In general terms, the high activity of the HDS catalyst may be attributed to the Ni-Mo-S active sites in the so-called Type II morphology that are present after the sulfidation step in NiMo/HTiMCM-41 [70]. The multilayer Ni-Mo-S particles are usually regarded as Type II active phase, which are considered to be more active than the low degree of stacking Type I phase.…”

Section: 6-dmdbtmentioning

confidence: 99%

Hydrodesulfurization of 4,6-Dimethyldibenzothiophene and the Diesel Oil Fraction on NiMo Catalysts Supported over Proton-Exchanged AlMCM-41 and TiMCM-41 Extrudates

et al. 2021

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NiMo catalysts supported on mesoporous MCM-41 type materials shaped with binder were tested for activity in the hydrodesulfurization of 4,6-dimethyldibenzothiophene (4,6-DMDBT) and the diesel fuel fraction (0.92 wt% of sulfur). The aim of the investigation was to evaluate the effect of ion exchange with protons of Al- or Ti-substituted MCM-41 mesoporous supports. The subjected catalytic systems were NiMo/HAlMCM-41 and NiMo/HTiMCM-41, and for comparison purposes NiMo/AlMCM-41 and NiMo/TiMCM-41. The samples were characterized by N2 sorption (at 77 K), XRD, TEM, XPS, SEM and Py–IR. It was found that the functionalization of AlMCM-41 and TiMCM-41 with protons increased the conversion of 4,6-DMDBT and the pseudo-first-order rate constant. Correspondingly, 4,6-DMDBT HDS reactions over the NiMo/HTiMCM-41 catalyst proceeded to a similar extent via hydrogenation and direct desulfurization, whereas over the NiMo/HAlMCM-41 they proceeded mainly via direct desulfurization. Furthermore, the ion-exchanged catalysts displayed two-fold higher efficiency in direct desulfurization than their non-modified counterparts. The NiMo/HTiMCM-41 catalyst exhibited the highest catalytic efficiency in the HDS of 4,6-DMDBT and the diesel oil fraction. The high activity of the NiMo/HTiMCM-41 catalyst is mainly attributed to its appropriate acidity, as well as the metal–support interaction providing both the high dispersion of the active phase and the desirable multilayered stacking morphology of the active phase slabs.

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Section: 6-dmdbtmentioning

confidence: 99%

Hydrodesulfurization of 4,6-Dimethyldibenzothiophene and the Diesel Oil Fraction on NiMo Catalysts Supported over Proton-Exchanged AlMCM-41 and TiMCM-41 Extrudates

et al. 2021

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“…However, the high content of olefins (30–50 wt%) in FCC naphtha is easily saturated, which can lead to a considerable loss of octane number (ON, an important economic indicator of gasoline) 1,2 . Therefore, high‐selectivity catalysts, optimal HDS conditions, and technological process have been widely studied to avoid the saturation of olefins and maintain the ON of gasoline 3‐7 …”

Section: Introductionmentioning

confidence: 99%

High efficient separation of olefin from fluid catalytic cracking naphtha: Separation mechanism and universal simulation method

et al. 2021

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The fluid catalytic cracking (FCC) naphtha critical component‐oriented separation process is an efficient method to produce ultra‐low‐sulfur (<10 μg/g) gasoline with minimal loss of octane number (<1 RON). However, the product quality is highly dependent on the structure of the components of FCC naphtha. Aromatics and thiophene sulfides without a methyl side chain favor the separation of olefin. The major impulse of olefin separation is the solvent‐induced dipole of aromatics or thiophene sulfides, leading to a “Plane‐to‐Plane” combination between the solvent and aromatics or thiophene sulfides, accompanied by a steric hindrance due to their side chains. This condition resulted in 2–3 times greater θ of benzene and thiophene compared with that of toluene and 3‐methylthiophene. In addition, an improved non‐random two‐liquid model was proposed based on the above results, and a simulation method for FCC naphtha solvent extraction process was established. The calculation results accorded well with industry data.

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“…Over the years, the burning of sulfur compounds has accelerated environmental degradation and had a serious impact on human life. 1,2 Desulfurization has become one of the major problems for the petroleum industry, especially in the context of strict legislation and increasing environmental awareness. 3 In China, the United States and other countries and regions, the sulfur content in fuel is strictly limited to less than 10 mg g À1 .…”

Section: Introductionmentioning

confidence: 99%

Atomic layer deposition of nano-scale molybdenum sulfide within a metal–organic framework for highly efficient hydrodesulfurization

Cui

Zhang

et al. 2021

Mater. Adv.

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Synthesis of novel NiMo catalysts supported on highly ordered TiO2-Al2O3 composites and their superior catalytic performance for 4,6-dimethyldibenzothiophene hydrodesulfurization

Cited by 58 publications

References 66 publications

Hydrodesulfurization of 4,6-Dimethyldibenzothiophene and the Diesel Oil Fraction on NiMo Catalysts Supported over Proton-Exchanged AlMCM-41 and TiMCM-41 Extrudates

Hydrodesulfurization of 4,6-Dimethyldibenzothiophene and the Diesel Oil Fraction on NiMo Catalysts Supported over Proton-Exchanged AlMCM-41 and TiMCM-41 Extrudates

High efficient separation of olefin from fluid catalytic cracking naphtha: Separation mechanism and universal simulation method

Atomic layer deposition of nano-scale molybdenum sulfide within a metal–organic framework for highly efficient hydrodesulfurization

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