Hexagonal mesoporous silicas with and without Zr as supports for HDS catalysts

Костова, Надежда; Spojakina, A.; Jirátová, Květa; Šolcová, Olga; Dimitrov, L.; Petrov, L.

doi:10.1016/s0920-5861(00)00579-4

Cited by 32 publications

(17 citation statements)

References 25 publications

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“…In general, the first step of reduction of octahedral Mo oxide species supported on ZrO 2 (x)-SBA-15 took place at lower temperatures than those supported on the starting SBA-15 silica, since incorporation of ZrO 2 in the OSM support made the reduction of Mo 6þ to Mo 4þ easier. The above results are well in line with the observations of Kostova et al (2001) and Garg et al (2008).…”

Section: Catalystssupporting

confidence: 92%

“…Two well-defined reduction peaks at 410 and 690 C were observed in the TPR profile of the Mo catalyst supported on pure ZrO 2 . The first one is assigned to the first step of reduction (from Mo 6þ to Mo 4þ ) of dispersed octahedral (Oh) Mo species and the second to the first step of reduction of tetrahedral (Td) Mo species strongly bound to Cordero et al, 1991;Kostova et al, 2001). In addition, hydrogen consumption in the 500 -600 C temperature range corresponds to the second step of reduction of Oh Mo species (from Mo 4þ to Mo 0 ).…”

Section: Catalystsmentioning

confidence: 99%

“…For instance, the introduction of ZrO 2 in ordered siliceous materials (OSM) allows obtaining ZrO 2 -containing solids of high specific surface area. Zirconia incorporation in OSM can be carried out by various experimental techniques, such as the addition of Zr(IV) precursor during the synthesis of OSM, its chemical grafting on the surface of already synthesized OSM, and different impregnation methods (Kostova et al, 2001;Landau et al, 2005;Sawant et al, 2005;Guo and Dong, 2007). In our group, different methods were employed for the preparation of ZrO 2 -containing SBA-15 materials used as supports for Mo and NiMo catalysts tested in hydrodesulfurization (HDS) of 4,6-dimethyldibenzothyophene (Gutiérrez et al, 2006a(Gutiérrez et al, ,b, 2007.…”

Section: Introductionmentioning

confidence: 99%

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APPLICATION OF NEW ZRO₂-SBA-15 MATERIALS AS CATALYTIC SUPPORTS: STUDY OF INTRINSIC ACTIVITY OF MO CATALYSTS IN DEEP HDS

Gutiérrez¹,

Ayala²,

Puente³

et al. 2009

Chemical Engineering Communications

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ZrO 2 -SBA-15 materials with different ZrO 2 loadings (12.5, 25, 37.5, and 50 wt.%) were prepared by incipient wetness impregnation of SBA-15 silica with zirconium (IV) n-propoxide solution and characterized by N 2 physisorption, IEP, and XRD. It was found that the dispersion of zirconia in ZrO 2 -SBA-15 samples decreased with ZrO 2 loading. Nevertheless, about 70-90% of the available support surface was covered with deposited ZrO 2 species leading to high zirconia surface, significantly higher than areas of the traditional bulk ZrO 2 supports. ZrO 2 -SBA-15 materials were used to prepare Mo catalysts, which were characterized (N 2 physisorption, XRD, TPR, and HRTEM) and tested in 4,6-dimethyldibenzothiophene hydrodesulfurization (HDS). Characteristics of Mo species deposited on ZrO 2 -SBA-15 materials with 25-50 wt.% of ZrO 2 and their intrinsic HDS activities were found to be similar to those of the Mo catalyst supported on pure ZrO 2 . Thus, it is shown for the first time that prepared ZrO 2 -SBA-15 materials combine chemical properties of zirconia, attractive for many catalytic applications, with excellent textural characteristics of SBA-15.

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Section: Catalystssupporting

confidence: 92%

Section: Catalystsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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APPLICATION OF NEW ZRO₂-SBA-15 MATERIALS AS CATALYTIC SUPPORTS: STUDY OF INTRINSIC ACTIVITY OF MO CATALYSTS IN DEEP HDS

Gutiérrez¹,

Ayala²,

Puente³

et al. 2009

Chemical Engineering Communications

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“…The hexagonal mesoporous silica (HMS) is a material with high specific surface area and large pore diameter [2]. The importance of HMS materials is that they present both high surface area and uniform pore size which make them suitable for catalyst supports [4]. For example, the catalytic activity of metalloporphyrins (with Mn, Fe or Co) in the oxidation of cyclooctane is enhanced by their dispersion on the surface of N Al-HMS mesoporous silica [5].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of a mesoporous HMS and its use as support of platinum catalysts

Martín¹,

López-Gaona²,

Viniegra³

et al. 2010

Reac Kinet Mech Cat

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Two mesoporous silicas (HMS) with high surface area and a pore diameter size of 2 nm were synthesized by a sol-gel method. Platinum catalysts were prepared with a 1 wt% metal content. A commercial silica supported catalyst was used for comparison. The catalysts were characterized by H 2 -TPR, TEM and 29 Si-CP-MAS-NMR. The catalytic activity was measured by the hydrodechlorination of 1,2-dichloroethane. The enhanced activity of the mesoporous catalysts was related to the platinum particle size.

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“…When the heteropolycompounds are loaded on supports, new heteropolyanions can be formed as a result of their interaction. The heteropolycompounds can include the support atom, and in this way, change their properties [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Titania-supported mixed HPMoV polyoxometallates as precursors of hydrodesulfurization catalysts

Kraleva

Spojakina

Edreva-Kardjieva

et al. 2007

React Kinet Catal Lett

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HDS catalysts were prepared by loading H 3 PMo 12 O 40 or H 4 PMo 11 V 1 O 40 polyoxometallates on TiO 2 (0.5 and 1.0 mmol (Mo+V)). Activity of the catalysts was tested in the HDS of thiophene. The activity of catalysts of low concentration was 2-3 times higher than the activity of those of high concentration. Temperature programmed reduction (TPR) and IR spectroscopy were used to determine the properties of the catalyst. TPR measurements proved that vanadium promotes and stabilizes HDS activity due to an increase in the Мо 5+ /Мо 4+ ratio.

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Hexagonal mesoporous silicas with and without Zr as supports for HDS catalysts

Cited by 32 publications

References 25 publications

APPLICATION OF NEW ZRO₂-SBA-15 MATERIALS AS CATALYTIC SUPPORTS: STUDY OF INTRINSIC ACTIVITY OF MO CATALYSTS IN DEEP HDS

APPLICATION OF NEW ZRO₂-SBA-15 MATERIALS AS CATALYTIC SUPPORTS: STUDY OF INTRINSIC ACTIVITY OF MO CATALYSTS IN DEEP HDS

Synthesis and characterization of a mesoporous HMS and its use as support of platinum catalysts

Titania-supported mixed HPMoV polyoxometallates as precursors of hydrodesulfurization catalysts

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Hexagonal mesoporous silicas with and without Zr as supports for HDS catalysts

Cited by 32 publications

References 25 publications

APPLICATION OF NEW ZRO2-SBA-15 MATERIALS AS CATALYTIC SUPPORTS: STUDY OF INTRINSIC ACTIVITY OF MO CATALYSTS IN DEEP HDS

APPLICATION OF NEW ZRO2-SBA-15 MATERIALS AS CATALYTIC SUPPORTS: STUDY OF INTRINSIC ACTIVITY OF MO CATALYSTS IN DEEP HDS

Synthesis and characterization of a mesoporous HMS and its use as support of platinum catalysts

Titania-supported mixed HPMoV polyoxometallates as precursors of hydrodesulfurization catalysts

Contact Info

Product

Resources

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APPLICATION OF NEW ZRO₂-SBA-15 MATERIALS AS CATALYTIC SUPPORTS: STUDY OF INTRINSIC ACTIVITY OF MO CATALYSTS IN DEEP HDS

APPLICATION OF NEW ZRO₂-SBA-15 MATERIALS AS CATALYTIC SUPPORTS: STUDY OF INTRINSIC ACTIVITY OF MO CATALYSTS IN DEEP HDS