New NiMo catalysts supported on Al-containing SBA-16 for 4,6-DMDBT hydrodesulfurizationEffect of the alumination method

Klimova, Tatiana; Lizama, Lilia; Amezcua, Juan Carlos; Roquero, Pedro; Terrés, E.; Navarrete, Juan T. López; Dominguez, J. M.

doi:10.1016/s0920-5861(04)00447-x

Cited by 15 publications

(14 citation statements)

References 20 publications

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“…According to Mizutani et al, phosphorus modifies the catalytic behavior in two ways: buildup of active sites density by enhanced metal dispersion and of Brønsted acidity. The Brønsted acidity diminishes the steric hindrance in compound adsorption on catalyst surface by promoting isomerization reactions of 4,6-DMDBT. − Increasing the support acidity enhances mainly the catalytic performance for hydrogenation route . Indeed, isomerization products of hydrogenated products were observed in our experiments, identified by mass spectrometry.…”

Section: Resultsmentioning

confidence: 72%

Effects of Phosphorus Content on Simultaneous Ultradeep HDS and HDN Reactions over NiMoP/Alumina Catalysts

Mello

Braggio

Magalhães

et al. 2017

Ind. Eng. Chem. Res.

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The effects of phosphorus content on competitive hydrodesulfurization (HDS) of 4,6-dimethyldibenzothiophene (4,6-DMDBT) and hydrodenitrogenation (HDN) of quinoline (Q) over NiMo catalysts were evaluated. Reactions were carried out in a trickle-bed high-pressure flow microreactor. HDS of 4,6-DMDBT was strongly inhibited at Q concentrations of 90 ppmw N, mostly hydrogenation (HYD) route in HDS, suggesting that 4,6-DMDBT and Q compete for the same hydrogenation active sites, which was confirmed by the products’ distribution in HDN reactions. Morphology and nature of active sites promoted by phosphorus addition led to different activity performance on competitive HDS and HDN reactions, as evidenced by TOF values. At low concentrations of Q, promoted catalysts maintained activity for both HDS and HDN. High Q levels (above 90 ppmw N) decreased HDS and HDN activity due to stronger inhibition of catalysts. The addition of 1 wt % of phosphorus showed superior activity, attributed to a combination of better dispersed NiMoS active sites and Brønsted acidity.

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Section: Resultsmentioning

confidence: 72%

Effects of Phosphorus Content on Simultaneous Ultradeep HDS and HDN Reactions over NiMoP/Alumina Catalysts

Mello

Braggio

Magalhães

et al. 2017

Ind. Eng. Chem. Res.

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“…All the supports exhibit a desorption peak at 353-473 K, which relates to the desorption of physically adsorbed NH 3 . 25 Other desorption peaks of NH 3 in the range of 450 K to 850 K are observed only for Al containing SBA-15 supports, indicating the presence of different types of acid sites. The peaks located at the lower desorption temperature range of 450 K to 570 K can be attributed to tetrahedral coordinated aluminum which has weak acidity whereas the peaks at the higher desorption temperature range (570-850 K) are ascribed to octahedral coordinated Al with stronger acidity.…”

Section: Catalysis Science and Technology Papermentioning

confidence: 96%

Effect of tetrahedral aluminum on the catalytic performance of Al–SBA-15 supported Ru catalysts in Fischer–Tropsch synthesis

Chen

Zhang

et al. 2013

Catal. Sci. Technol.

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“…Recently, mesoporous silicates such as FSM-16, MCM-41, and SBA-15, which have larger pore diameters and higher surface areas than zeolites, have attracted wide attention as new materials for catalysts and catalyst supports. Some attempts have been made to develop new HDS catalysts based on mesoporous silicates [16][17][18][19]. In previous papers, we have reported that noble metals, especially platinum, supported on mesoporous silicates such as FSM-16 [20] and MCM-41 [21,22], showed high activity in the HDS of thiophene, and noble metals supported on mesoporous silicates can potentially be used as new HDS catalysts for petroleum feedstock.…”

Section: Introductionmentioning

confidence: 99%

Preparation of highly active AlSBA-15-supported platinum catalyst for thiophene hydrodesulfurization

Kanda

Aizawa

Kobayashi

et al. 2007

Applied Catalysis B: Environmental

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The catalytic activities of various noble metals (Pt, Pd, Rh, and Ru) supported on siliceous SBA-15 and Al-containing SBA-15 (AlSBA-15) for hydrodesulfurization (HDS) of thiophene at 350 °C were investigated. AlSBA-15 was prepared by a grafting method using aluminum isopropoxide (Al(OC 3 H 7) 3) hexane solution. The HDS activity of Pt/AlSBA-15 catalyst was the highest among those of various supported noble metal catalysts, and this activity was higher than that of commercial CoMo/Al 2 O 3 HDS catalyst. The catalysts were characterized by XRD analysis, hydrogen adsorption, 2-propanol dehydration, cumene cracking, and FT-IR. Dispersion of Pt on SBA-15 was remarkably enhanced by Al grafting. It was revealed that the acidity of AlSBA-15 was higher than that of SBA-15. Furthermore, Brønsted acid sites were observed on AlSBA-15. FT-IR spectra of thiophene adsorbed on AlSBA-15 indicate that thiophene molecules interact with Brønsted acid sites on the surface of AlSBA-15 and that the strength of this interaction was stronger than that of SBA-15. Based on these results, thiophene molecules activated on Brønsted acid site of AlSBA-15 and hydrogen molecules activate to form spillover hydrogen on Pt particles in Pt/AlSBA-15 catalyst in the HDS of thiophene.

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New NiMo catalysts supported on Al-containing SBA-16 for 4,6-DMDBT hydrodesulfurizationEffect of the alumination method

Cited by 15 publications

References 20 publications

Effects of Phosphorus Content on Simultaneous Ultradeep HDS and HDN Reactions over NiMoP/Alumina Catalysts

Effects of Phosphorus Content on Simultaneous Ultradeep HDS and HDN Reactions over NiMoP/Alumina Catalysts

Effect of tetrahedral aluminum on the catalytic performance of Al–SBA-15 supported Ru catalysts in Fischer–Tropsch synthesis

Preparation of highly active AlSBA-15-supported platinum catalyst for thiophene hydrodesulfurization

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