Sulfated Mesoporous Tantalum Oxides in the Shape Selective Synthesis of Linear Alkyl Benzene

Kang, Junjie; Rao, Yuxiang; Antonelli, David M.

doi:10.1002/anie.200800721

Cited by 28 publications

(20 citation statements)

References 27 publications

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“…175 H 2 SO 4 or H 3 PO 4 treated mesoporous Nb 2 O 5 and Ta 2 O 5 were investigated for benzylation reactions. 176,177 The acid site density of sulfated mesoporous Nb 2 O 5 was 31.78 mmol g À1 , higher than that of bulk sulfated zirconia. Ordered amorphous mesoporous Ta 2 O 5 with different pore sizes was prepared by variation of the carbon chain length of the primary alkyl amine templates (C6, C12, and C18).…”

Section: Mesoporous Solid Acid Catalystsmentioning

confidence: 96%

Ordered mesoporous metal oxides: synthesis and applications

2012

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Great progress has been made in the preparation and application of ordered mesoporous metal oxides during the past decade. However, the applications of these novel and interesting materials have not been reviewed comprehensively in the literature. In the current review we first describe different methods for the preparation of ordered mesoporous metal oxides; we then review their applications in energy conversion and storage, catalysis, sensing, adsorption and separation. The correlations between the textural properties of ordered mesoporous metal oxides and their specific performance are highlighted in different examples, including the rate of Li intercalation, sensing, and the magnetic properties. These results demonstrate that the mesoporosity has a direct impact on the properties and potential applications of such materials. Although the scope of the current review is limited to ordered mesoporous metal oxides, we believe that the information may be useful for those working in a number of fields.

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Section: Mesoporous Solid Acid Catalystsmentioning

confidence: 96%

Ordered mesoporous metal oxides: synthesis and applications

2012

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“…Ours results was superior to those present in the literature. 18 The catalytic properties of niobium oxide were evaluated in the alkylation reaction of dodecene with benzene. At 80 o C and a benzene /dodecene molar ratio 10/1 the conversion was 1.2% after 30 min.…”

Section: Resultsmentioning

confidence: 99%

“…At 80 o C and a benzene /dodecene molar ratio 10/1 the conversion was 1.2% after 30 min. 18 The alkylation of anisole with 1-octene and 1-dodecene over niobium phosphate resulted mainly in the formation of monoalkylated products ( Table 2, entry 1 and 2).…”

Section: Resultsmentioning

confidence: 99%

Liquid phase alkylation of anisole and phenol catalyzed by niobium phosphate

Pereira

Cruz

Lachter

2010

J. Braz. Chem. Soc.

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A atividade catalítica do fosfato de nióbio foi avaliada na reação de alquilação em fase líquida do anisol com 1-dodeceno, 1-octeno, 2-octanol e 1-octen-3-ol e na reação do fenol com 1-octen-3-ol. Melhores resultados foram alcançados na alquilação do anisol e do fenol com 1-octen-3-ol que produziu principalmente produtos monoalquilados. Na reação com o fenol e 1-octen-3-ol os principais produtos formados foram os octenil-fenóis (C-alquilação) e o fenil-octenil éter (O-alquilação). A reação favorece a formação de C-alquilados em relação aos O-alquilados.The catalytic activity of niobium phosphate was evaluated in the liquid phase alkylation reaction of anisole with 1-dodecene, 1-octene, 2-octanol and 1-octen-3-ol and in the reaction of phenol with 1-octen-3-ol. Best results were achieved in the alkylation of anisole and phenol with 1-octen-3-ol that produced mainly monoalkylate products. In the reaction with phenol the major products formed were octenylphenols (C-alkylation) and phenyl-octenyl ether (O-alkylates). The reaction favors the formation of C-alkylates over O-alkylates.

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“…The mesopores in the oxide allow the reactants to access additional active acid sites in the pores, resulting in improved rates of acid catalysis. Mesoporous niobium oxides and tantalum oxides treated with phosphoric acid or sulfuric acid have been examined as solid acid catalysts [57][58][59]. These mesoporous oxides exhibited remarkable activity in Friedel-Crafts alkylation and 1-hexene isomerization in the liquid phase.…”

Section: New Catalytic Systemsmentioning

confidence: 99%

“…These mesoporous oxides exhibited remarkable activity in Friedel-Crafts alkylation and 1-hexene isomerization in the liquid phase. For sulfated mesoporous tantalum oxides (SO 4 2− /m-Ta 2 O 5 ), the effect of pore size has been investigated using normal amine surfactants with different chain lengths including 1-hexylamine (C6), 1-dodecylamine (C12), and 1-octadecylamine (C18) [58,59]. For both 1-hexene isomerization and benzene alkylation with 1-dodecene, SO 4 2− /m-Ta 2 O 5 with a small pore size of 1.2 nm (C6) and a large pore size of 2.3 nm (C18) were found to exhibit much lower activity than SO 4 2− /m-Ta 2 O 5 with a medium pore size of 1.8 nm (C12), which afforded excellent results.…”

Section: New Catalytic Systemsmentioning

confidence: 99%

Mechanistic Studies of Solid Acids and Base‐Catalyzed Clean Technologies

Takagaki

Nishimura

Ebitani

2013

Heterogeneous Catalysts for Clean Technology

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IntroductionThe importance of solid acid and base catalysts in clean technologies has been recognized for a long time, and many books and reviews have been published since the text by Tanabe [1]. Tanabe et al.[2] revised their book in 1989, reviewing the definition and classification of solid acids and bases, determination of acidic and basic properties, and catalysis for isomerization, acylation, hydration of alkenes, methanol conversion, dehydration, dehydrogenation, esterification, hydrolysis, hydrocraking (hydrogenolysis), and oxidation reactions. The development of solid acid catalysts has been surveyed in several reviews [3][4][5][6][7][8][9][10]. Catalysis by solid bases and the mechanism of base-catalyzed reactions such as isomerization of alkenes and alkynes, aldol addition and aldol condensation, Henry reaction (nitro-aldol reaction), Knoevenagel condensation, Michael addition, the Tishchenko reaction, alkylation reactions, and addition reactions such as addition of amines to epoxides, transfer hydrogenation (Meerwein-Ponndorf-Verley (MPV) reaction), esterification and transesterification, and liquid-phase oxidations including Baeyer-Villiger oxidation and alkene epoxidation have been recently emphasized by Ono and Hattori [11], encompassing many splendid reviews and papers [12][13][14][15][16][17][18][19][20].The first part of this chapter is intended to survey recent literature on new catalytic materials because the development of new types of metal oxides and layered-and carbon-based materials with different morphologies opens up novel acid-base catalysis that enables new type of clean reaction technologies. Mechanistic considerations of acid-and base-catalyzed reactions should result in new clean catalytic processes for Green and Sustainable Chemistry, for example, transformations of biorenewable feedstock into value-added chemicals and fuels [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35]. The latter part of this chapter, therefore, focuses on biomass conversion using solid acid and base catalysts, which covers recent developments on acid-base, one-pot reaction systems for carbon-carbon bond formations, and biomass conversion including synthesis of furfurals from sugars, biodiesel production, and glycerol utilization.

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Sulfated Mesoporous Tantalum Oxides in the Shape Selective Synthesis of Linear Alkyl Benzene

Cited by 28 publications

References 27 publications

Ordered mesoporous metal oxides: synthesis and applications

Ordered mesoporous metal oxides: synthesis and applications

Liquid phase alkylation of anisole and phenol catalyzed by niobium phosphate

Mechanistic Studies of Solid Acids and Base‐Catalyzed Clean Technologies

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