Acidity and catalytic activities of sulfated zirconia inside SBA-15

Garg, Shelu; Soni, Kapil; Kumaran, G. Muthu; Bal, Rajaram; Góra‐Marek, Kinga; Gupta, Jancy; Sharma, L.D.; Dhar, G. Murali

doi:10.1016/j.cattod.2008.03.021

Cited by 68 publications

(37 citation statements)

References 16 publications

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“…Subsequently, the FTIR spectrum was taken at 403 K. The band intensities in this spectrum were used to calculate the total concentration of Brønsted and Lewis sites. The total concentration of Brønsted and Lewis sites was calculated using the intensities of the 1545 cm −1 band of pyridinium ions (Py + ) and the 1450 cm −1 band of pyridine coordinatively bonded to Lewis sites (PyL), respectively, by applying their respective extinction coefficients [18]. The acid strength distribution was determined on the basis of pyridine desorption studies at elevated temperatures under high vacuum conditions.…”

Section: Characterization Techniquesmentioning

confidence: 99%

MCF Material as an Attractive Support for Vanadium Oxide Applied as a Catalyst for Propene Epoxidation with N2O

et al. 2018

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Vanadium modified mesocellular silica foams (MCF) materials (V content ca. 3 and 5 wt%) prepared by the impregnation method show mainly isolated or low-polymeric VO x species, which was confirmed by means of Raman spectroscopy and DR UV-Vis. Textural measurements, and also XRD and TEM results indicate that the characteristic mesocellular structural features of MCFs are preserved after vanadium incorporation. The MCF-supported vanadia catalysts exhibit much higher propene conversion and propene oxide productivity when compared to vanadium modified mesoporous silicas of 2D structure, demonstrating that apart from the presence of highly dispersed isolated vanadium species, internal molecular transport within three-dimensional ultra large pores of MCF materials also plays an important role in gas-phase propene epoxidation. Graphical Abstract

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Section: Characterization Techniquesmentioning

confidence: 99%

MCF Material as an Attractive Support for Vanadium Oxide Applied as a Catalyst for Propene Epoxidation with N2O

et al. 2018

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“…For example, incorporation of a secondary mesoporosity into a microporous H-b-zeolite to create a hierarchical solid acid significantly increased catalytic activity by lowering diffusion barriers [85]. Templated mesporous materials are widely used as catalyst supports [86,87], with SBA-15 silicas popular candidates for reactions pertinent to biodiesel synthesis as previously discussed [75,77,88]. However, such surfactant-templated supports possessing long, isolated parallel and narrow channels are ill-suited to efficient in-pore diffusion of bio-oil feedstocks affording poor catalytic turnover.…”

Section: Heterogeneously Catalysed Routes To Biodieselmentioning

confidence: 99%

Catalysing sustainable fuel and chemical synthesis

Lee

2014

Appl Petrochem Res

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Concerns over the economics of proven fossil fuel reserves, in concert with government and public acceptance of the anthropogenic origin of rising CO 2 emissions and associated climate change from such combustible carbon, are driving academic and commercial research into new sustainable routes to fuel and chemicals. The quest for such sustainable resources to meet the demands of a rapidly rising global population represents one of this century's grand challenges. Here, we discuss catalytic solutions to the clean synthesis of biodiesel, the most readily implemented and low cost, alternative source of transportation fuels, and oxygenated organic molecules for the manufacture of fine and speciality chemicals to meet future societal demands.

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“…To address these issues, development of a noncorrosive and recoverable heterogeneous catalyst for esterification pretreatments is critical [5]. In this respect, various solid acid catalysts have been studied for organic acid esterification, including SO 4 / ZrO 2 [8][9][10], sulfonic acid functionalised (hierarchical) mesoporous SBA-15 [7,[11][12][13][14][15] KIT-6 [16] and PMO [17] silicas, Cs-exchanged heteropolyacids [18][19][20][21][22], tungstated zirconia [23], zirconium phosphate [24][25][26] and Nafion/SiO 2 composite (SAC-13) [27]. Among the solid acid catalysts, zeolites are efficient catalysts for esterification [28][29][30] due to their strong Brønsted acidity and tunable physical and chemical properties through altering their framework Si:Al ratio and structure.…”

Section: Introductionmentioning

confidence: 99%

On the influence of Si:Al ratio and hierarchical porosity of FAU zeolites in solid acid catalysed esterification pretreatment of bio-oil

Osatiashtiani

Puértolas

Oliveira

et al. 2017

Biomass Conv. Bioref.

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A family of faujasite (FAU) zeolites with different Si:Al ratio, and/or hierarchical porosity introduced via postsynthetic alkaline desilication treatment, have been evaluated as solid acid catalysts for esterification pretreatments of pyrolysis bio-oil components. Acetic acid esterification with aliphatic and aromatic alcohols including methanol, anisyl alcohol, benzyl alcohol, p-cresol and n-butanol was first selected as a model reaction to identify the optimum zeolite properties. Materials were fully characterised using N 2 porosimetry, ICP, XRD, XPS, FT-IR, pyridine adsorption, NH 3 TPD, In-situ ATR and inverse gas chromatography (IGC). IGC demonstrates that the surface polarity and hence hydrophobicity of FAU decreases with increased Si:Al ratio. Despite possessing a higher acid site loading and acetic acid adsorption capacity, high Al-content FAU possess weaker acidity than more siliceous catalysts. Esterification activity increases with acid strength and decreasing surface polarity following the order FAU30>FAU6>FAU2.6. The introduction of mesoporosity through synthesis of a hierarchical HFAU30 material further enhances esterification activity through improved acid site accessibility and hydrophobicity. Methanol was the most reactive alcohol for esterification, and evaluated with HFAU30 for the pretreatment of a real pyrolysis bio-oil, reducing the acid content by 76% under mild conditions.

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Acidity and catalytic activities of sulfated zirconia inside SBA-15

Cited by 68 publications

References 16 publications

MCF Material as an Attractive Support for Vanadium Oxide Applied as a Catalyst for Propene Epoxidation with N2O

MCF Material as an Attractive Support for Vanadium Oxide Applied as a Catalyst for Propene Epoxidation with N2O

Catalysing sustainable fuel and chemical synthesis

On the influence of Si:Al ratio and hierarchical porosity of FAU zeolites in solid acid catalysed esterification pretreatment of bio-oil

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