Synthesis and characterization of W-SBA-15 and W-HMS as supports for HDS

Дімітров, Л.; Palcheva, R.; Spojakina, A.; Jirátová, Květa

doi:10.1007/s10934-010-9394-0

Cited by 23 publications

(24 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Consequently, both the total content and ratios of the metals content should be taken into account in the process of catalyst design. Literatures [44,45] discussed the impact of molar ratios of Pt/(Pt + Pd) and Ni/(Ni + W) on the catalytic activity, demonstrating that the former or the latter possessed the highest hydrogenation activity for naphthalene or HDS activity for thiophene when the ratios are 0.7 or 0.28, respectively. Study on Mo-Ni 2 P/SBA-15/cordierite monolithic catalyst [16] indicated that its HDS activity for DBT was optimal when the molar ratio of Mo/Ni + Mo was 0.18, however, when the ratio was 0.26 in NiMo/Al 2 O 3 -nmY, the optimal desulfurization degree of diesel was up to 99.6% [23].…”

Section: The Consideration For Metals Content Ratiomentioning

confidence: 99%

“…In addition, P may substitute for the carrier's framework aluminum, more specifically, a framework aluminum hydroxyl of the zeolite would be substituted by two phosphorus hydroxyl, making B, L acid amounts modulated [24]. Transition metal ions such as W have empty orbits; their addition can make a well increase of the amount of acid [15,45] …”

Section: Influences On the Acids Distribution And Acidmentioning

confidence: 99%

See 1 more Smart Citation

Advancement of Hydro-Desulfurization Catalyst and Discussion of Its Application in Coal Tar

Liu¹,

Zhang²,

Jiang³

et al. 2013

ACES

View full text Add to dashboard Cite

This paper describes the influences of active metal, promoter and chelating agent on the properties of hydro-desulfurization catalyst. The use of chelating agent, especially its combination with common promoters e.g., EDTA-P, has an important meaning to develop highly active catalyst, specifically to unify the active metal dispersion degree and sulfurization degree in some extent, however, they are contradictory in conventional cognition. In the aspect of carriers, composition and nanometer carriers have more excellent performances in acidity, pores structure and metal-carrier interaction than common carriers, and are the developing trend in the future and should be a breakthrough mainly in preparation methods. We also pointed out the decisive factors to improve the activity of the catalyst: higher sulfurization degree of active metal oxide and higher aspect ratios of active phase crystal morphology, and the proper acidity and pores structure can be considered the key factors for deep desulfurization whose mainly obstacle is the desulfurization of large rigid molecules, e.g., dibenzothiophene and 4, 6-dimethyl substituted dibenzothiophene. Based on above that, We discussed the suitable hydrodesulfurization (HDS) catalyst for coal tar, aiming at providing some theoretical guidance for the "design" of coal tar HDS catalyst.

show abstract

Section: The Consideration For Metals Content Ratiomentioning

confidence: 99%

Section: Influences On the Acids Distribution And Acidmentioning

confidence: 99%

Advancement of Hydro-Desulfurization Catalyst and Discussion of Its Application in Coal Tar

Liu¹,

Zhang²,

Jiang³

et al. 2013

ACES

View full text Add to dashboard Cite

show abstract

“…Numerous efforts have been focused on synthesizing materials in which the active tungsten species are well isolated and anchored on the support through W-O-Si covalent bonds. In recent years, tungsten has been incorporated into high surface area mesoporous molecular sieves, such as MCM-41 [21,[25][26][27][28][29][30][31], MCM-48 [32,33], SBA-15 [34][35][36], SBA-16 [23], HMS [37,38], MCF [39,40], KIT-5 [41], KIT-6 [24,42], and TUD-1 [43].…”

Section: Introductionmentioning

confidence: 99%

Tungsten-Based Mesoporous Silicates W-MMM-E as Heterogeneous Catalysts for Liquid-Phase Oxidations with Aqueous H2O2

et al. 2018

View full text Add to dashboard Cite

Mesoporous tungsten-silicates, W-MMM-E, have been prepared following evaporation-induced self-assembly methodology and characterized by elemental analysis, XRD, N 2 adsorption, STEM-HAADF (high angle annular dark field in scanning-TEM mode), DRS UV-vis, and Raman techniques. DRS UV-vis showed the presence of two types of tungsten oxo-species in W-MMM-E samples: isolated tetrahedrally and oligomeric octahedrally coordinated ones, with the ratio depending on the content of tungsten in the catalyst. Materials with lower W loading have a higher contribution from isolated species, regardless of the preparation method. W-MMM-E catalyzes selectively oxidize of a range of alkenes and organic sulfides, including bulky terpene or thianthrene molecules, using green aqueous H 2 O 2 . The selectivity of corresponding epoxides reached 85-99% in up to 80% alkene conversions, while sulfoxides formed with 84-90% selectivity in almost complete sulfide conversions and a 90-100% H 2 O 2 utilization efficiency. The true heterogeneity of catalysis over W-MMM-E was proved by hot filtration tests. Leaching of inactive W species depended on the reaction conditions and initial W loading in the catalyst. After optimization of the catalyst system, it did not exceed 20 ppm and 3 ppm for epoxidation and sulfoxidation reactions, respectively. Elaborated catalysts could be easily retrieved by filtration and reused several times with maintenance of the catalytic behavior.

show abstract

“…Actually, WO 3 -containing SBA15 have been synthesized and employed to catalyze a variety of chemical transformations, such as oxidation of cyclopentene [31,32], desulfurization [33], dehydration [34], and metathesis [35,36]. The incorporation of tungsten source into SBA15 matrix induces the formation of different tungsten species forms, among which isolated tungsten species or low oligomeric tungsten oxide species with terminal W@O groups are deemed as actives sites to initiate above catalytic reactions [31][32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

“…The incorporation of tungsten source into SBA15 matrix induces the formation of different tungsten species forms, among which isolated tungsten species or low oligomeric tungsten oxide species with terminal W@O groups are deemed as actives sites to initiate above catalytic reactions [31][32][33][34][35][36]. Though these tungsten species are powerful to catalyze organic transformations under conventional conditions, as far as we know, there are no reports focusing on the photocatalytic evaluation of tungsten-containing SBA15 under visible-light irradiation.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization, and visible-light-driven photocatalytic performance of W-SBA15

Chang

Wang

Luo

et al. 2016

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

a b s t r a c tA series of tungsten-containing mesoporous SBA15 with different tungsten contents were prepared through a direct co-condensation sol-gel method and then analyzed by various techniques. XRD patterns revealed that the original mesoporous morphology was maintained after introducing tungsten species and forms of tungsten species were changed from incorporated tungsten to isolated tungsten species or low oligomeric tungsten oxide species, and finally to crystalline WO 3 with the increase of tungsten precursor content, which were also proven by HRTEM images, UV-Vis DRS, and FT-IR spectra. The W-SBA15 samples exhibited satisfactory photocatalytic performance toward degradation of dye Rhodamine B (RhB) and 2,4-dichlorophenol (2,4-DCP). In particular, the best candidate, sample 10%W-SBA15 showed an apparent reaction rate constant for RhB that was nearly 10 times as high as that of bulk WO 3 . The enhancement of photocatalytic capability was attributed to the mesoporous morphology with enlarged surface areas, negatively charged surface, and favorable tungsten forms such as incorporated tungsten, isolated tungsten or low oligomeric tungsten oxide species. In addition, active radicals trapping experiments and DMPO spin-trapping ESR spectra indicated that photogenerated holes were major oxidative species during photocatalysis.

show abstract

Synthesis and characterization of W-SBA-15 and W-HMS as supports for HDS

Cited by 23 publications

References 41 publications

Advancement of Hydro-Desulfurization Catalyst and Discussion of Its Application in Coal Tar

Advancement of Hydro-Desulfurization Catalyst and Discussion of Its Application in Coal Tar

Tungsten-Based Mesoporous Silicates W-MMM-E as Heterogeneous Catalysts for Liquid-Phase Oxidations with Aqueous H2O2

Synthesis, characterization, and visible-light-driven photocatalytic performance of W-SBA15

Contact Info

Product

Resources

About