Liquid phase alkylation of anisole by benzyl alcohol catalyzed on alumina-supported niobia

Cruz, Marcus Henrique Campino de la; Abdel-Rehim, Mona A.; Rocha, Ângela Sanches; Silva, João F. C. da; Faro, Arnaldo C.; Lachter, Elizabeth R.

doi:10.1016/j.catcom.2007.01.019

Cited by 42 publications

(23 citation statements)

References 15 publications

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“…In the benzylation of anisole with benzyl alcohol catalyzed by clays, 23 ion exchange resins 24 and alumina 25 the dibenzyl-ether was also observed, together with the alkylation product. Deshpande et al 26 reported that etherification is faster than alkylation over K-10 modified with SbCl 3 and that ether formation can be associated to both, Brønsted and Lewis acid sites.…”

Section: Resultsmentioning

confidence: 94%

Etherification of glycerol with benzyl alcohol catalyzed by solid acids

Silva¹,

Gonçalves²,

Lachter³

et al. 2009

J. Braz. Chem. Soc.

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Neste trabalho apresentamos os resultados da eterificação do glicerol com álcool benzílico, catalisada por diferentes sólidos ácidos. O mono-éter benzílico do glicerol foi o produto principal nas reações com a zeólita β e a resina ácida Amberlyst-35. Já o éter-di-benzílico foi o produto majoritário nas reações com o ácido p-tolueno-sulfônico e a argila K-10 como catalisadores. O ácido nióbico foi inativo na reação. A estrutura porosa da zeólita impediu a formação significativa de produtos de di e tri eterificação.In this work we present the results of glycerol etherification with benzyl alcohol, catalyzed by different solid acids. The mono-benzyl-glycerol ether was the main product in the reactions catalyzed by β zeolite and Amberlyst-35 acid resin, whereas di-benzyl-ether was formed in higher yield with the use of p-toluene-sulfonic acid and K-10 montmorillonite as catalyst. Niobic acid was inactive in this reaction. The porous structure of the zeolite impaired the formation of di and tri-benzyl-glycerol ethers.

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Section: Resultsmentioning

confidence: 94%

Etherification of glycerol with benzyl alcohol catalyzed by solid acids

Silva¹,

Gonçalves²,

Lachter³

et al. 2009

J. Braz. Chem. Soc.

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“…Niobium-containing compounds are increasingly finding attention amongst researchers in search for better performing heterogeneous catalysts [10][11][12][13][14]. Niobium-based materials have proved to possess enhanced catalytic activity, high product selectivity, extended catalyst life, redox properties, and to be a rather effective support for metal-based catalysts.…”

Section: Introductionmentioning

confidence: 99%

H3PO4- and H2SO4-treated niobic acid as heterogeneous catalyst for methyl ester production

Pietre

Almeida

Landers

et al. 2010

Reac Kinet Mech Cat

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The activity of solid niobic acid treated with sulfuric acid and with phosphoric acid was tested in the catalytic esterification of oleic acid and in transesterification of soybean oil with methanol. X-ray diffraction studies revealed niobic acid treated with sulfuric acid to be an amorphous solid, while niobic acid treated with phosphoric acid presented a crystalline phase, probably due to the formation of hydrogen niobium phosphate. Among the characterization methods employed here, XPS was particularly instrumental in showing that niobium dihydrogen phosphate and niobium hydrogen sulfate moieties are the acidic active sites responsible for the catalytic effect. The latter is more active according to ammonia TPD studies. Yields as high as 78% in the esterification of oleic acid with methanol and 40% in the transesterification of soybean oil catalyzed by NbSO 4 were recorded.

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“…On the other hand, previous XAFS study [7] of supported niobium oxide showed that a niobic acid-like compound is stabilized on Al 2 O 3 surface at higher temperatures than 673 K at somewhat high loading of niobium oxide and predicted that highly loaded Nb 2 O 5 / Al 2 O 3 would act as a stable Brønsted acid. In the present paper, we prepared a series of Nb 2 O 5 /Al 2 O 3 with various loading of Nb 2 O 5 and examined its unique acid property using a so-called Friedel-Crafts reaction of anisole and benzyl alcohol to be promoted on Brønsted acid [8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%