Ni and Mo interaction with Al-containing MCM-41 support and its effect on the catalytic behavior in DBT hydrodesulfurization

Klimova, Tatiana; Calderón, M.; Ramı́rez, Jorge

doi:10.1016/s0926-860x(02)00417-9

Cited by 144 publications

(64 citation statements)

References 35 publications

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“…It can be seen that the chemical shift of the Al (tet) of the grafted materials was closer to that of tetrahedral Al in zeolite and amorphous aluminum silicate reported in literature (Klimova et al 2003;Hensen et al 2010;Góra-Marek et al 2005), indicating the formation of Al-O-Si bonds resulted from the grafting of Al atoms on the surface of SiO 2 microspheres. It is noteworthy that the spectra of these Al 2 O 3 -grafted materials were different from those of c-Al 2 O 3 , which consists mostly of Al(tet) and Al(oct) with a Al(tet)/Al(oct) atomic ratio of 3/7, and the Al(pen) accounts for very small amount.…”

Section: Support and Catalyst Characterizationsupporting

confidence: 75%

“…Several researchers have investigated the HDS performance of catalysts supported on alumina-grafted materials. Klimova et al (2003) found that a catalyst with a higher content of alumina has lower HDS activity, and concluded that over strong metal-support interaction, caused by incorporation of alumina in MCM-41, made the reduction and sulfidation of the active component more difficult. However, in the study of the effect of incorporation of alumina on HDS activity of NiMo/SBA-15 catalysts, it was found that the blockage of catalyst pores by alumina could lead to significant decline in activity in the case of high content of alumina (Rayo et al 2009).…”

Section: Introductionmentioning

confidence: 99%

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The surface properties of aluminated meso–macroporous silica and its catalytic performance as hydrodesulfurization catalyst support

et al. 2017

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Aluminated mesoporous silica was prepared by multiple post-grafting of alumina onto uniform mesoporous SiO 2 , which was assembled from monodisperse SiO 2 microspheres. Hydrodesulfurization (HDS) catalyst was prepared by loading Ni and Mo active components onto the aluminated uniform mesoporous SiO 2 , and its HDS catalytic performance was evaluated using hydrodesulfurization of dibenzothiophene as the probe reaction at 300°C and 6.0 MPa in a tubular reactor. The samples were characterized by N 2 physisorption, scanning electronic microscopy, Fourier transform infrared spectrum, X-ray diffraction (XRD), temperature-programmed desorption of ammonia (NH 3 -TPD), 27 Al nuclear magnetic resonance ( 27 Al-NMR) and high-resolution transmission electron microscopy (HRTEM). The results showed that the Si-OH group content of SiO 2 was mainly dependent on the pretreatment conditions and had significant influence on the activity of the NiMo catalyst. The surface properties of the aluminated SiO 2 varied with the Al 2 O 3 -grafting cycles. Generally after four cycles of grafting, the aluminated SiO 2 behaved like amorphous alumina. In addition, plotting of activity of NiMo catalysts supported on aluminated mesomacroporous silica materials against the Al 2 O 3 -grafting cycle yields a volcano curve.

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Section: Support and Catalyst Characterizationsupporting

confidence: 75%

Section: Introductionmentioning

confidence: 99%

The surface properties of aluminated meso–macroporous silica and its catalytic performance as hydrodesulfurization catalyst support

et al. 2017

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“…The second peak, positioned at higher temperatures (600-650 ºC), is ascribed to difficult to reduce NiO species [45,46]. size (L c ), Ni crystal domain size (dp Ni ) and BET surface area (S BET ) of the carbonaceous samples are reported in Table 3.…”

Section: Catalysts Characterizationmentioning

confidence: 99%

Effect of the synthesis conditions of Ni/Al2O3 catalysts on the biogas decomposition to produce H2-rich gas and carbon nanofibers

Llobet

Pinilla

Moliner

et al. 2015

Applied Catalysis B: Environmental

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The utilization of biogas as carbon source for the co-production of filamentous-like materials and syngas is proposed. Catalysts with different Ni:Al molar ratios, Al 2 O 3 supports and preparation methods were synthesized. The suitability of the catalysts was analyzed considering activity, stability and carbon yield. Catalysts showed a good performance and similar results according to syngas compositions were obtained.However, some differences related to stability over time and carbon yields were detected. TPR analysis and TEM micrographs of the fresh catalysts revealed the presence of two different Ni particles: large Ni particles with low metal support interaction (MSI) that favoured the formation of encapsulating carbon and small Ni particles inserted in the Al 2 O 3 structure with a greater MSI that lead to NCs formation.Generally both kinds of Ni particles were observed in all catalysts, however their relative abundance was dramatically affected by the Al 2 O 3 employed, the preparation method and the Ni:Al molar ratio.

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“…Silica-based mesoporous materials (e.g., SBA-n, MCM-48, MCM-41) have attracted much attention in many areas of material science and technology such as separations, adsorptions and catalysis [40,41]. They have shown good characteristics because of their high specific surface area, controllable pore size and pore volume.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Production from Cyclic Chemical Looping Steam Methane Reforming over Yttrium Promoted Ni/SBA-16 Oxygen Carrier

et al. 2017

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Abstract:In this work, the modification of Ni/SBA-16 oxygen carrier (OC) with yttrium promoter is investigated. The yttrium promoted Ni-based oxygen carrier was synthesized via co-impregnation method and applied in chemical looping steam methane reforming (CL-SMR) process, which is used for the production of clean energy carrier. The reaction temperature (500-750 • C), Y loading (2.5-7.4 wt. %), steam/carbon molar ratio (1-5), Ni loading (10-30 wt. %) and life time of OCs over 16 cycles at 650 • C were studied to investigate and optimize the structure of OC and process temperature with maximizing average methane conversion and hydrogen production yield. The synthesized OCs were characterized by multiples techniques. The results of X-ray powder diffraction (XRD) and energy dispersive X-ray spectroscopy (EDX) of reacted OCs showed that the presence of Y particles on the surface of OCs reduces the coke formation. The smaller NiO species were found for the yttrium promoted OC and therefore the distribution of Ni particles was improved. The reduction-oxidation (redox) results revealed that 25Ni-2.5Y/SBA-16 OC has the highest catalytic activity of about 99.83% average CH 4 conversion and 85.34% H 2 production yield at reduction temperature of 650 • C with the steam to carbon molar ratio of 2.

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Ni and Mo interaction with Al-containing MCM-41 support and its effect on the catalytic behavior in DBT hydrodesulfurization

Cited by 144 publications

References 35 publications

The surface properties of aluminated meso–macroporous silica and its catalytic performance as hydrodesulfurization catalyst support

The surface properties of aluminated meso–macroporous silica and its catalytic performance as hydrodesulfurization catalyst support

Effect of the synthesis conditions of Ni/Al2O3 catalysts on the biogas decomposition to produce H2-rich gas and carbon nanofibers

Hydrogen Production from Cyclic Chemical Looping Steam Methane Reforming over Yttrium Promoted Ni/SBA-16 Oxygen Carrier

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