Preparation of Bulk and Supported Heteropolyacid Salts

Soled, S.; Miseo, S.; Mcvicker, G. B.; Baumgartner, Joseph E.; Gates, William E.; Gutiérrez, Alejandro García; Paes, Juliana Lobo

doi:10.1016/b978-012508460-4/50018-8

Cited by 26 publications

(21 citation statements)

References 17 publications

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“…An incipient phase of H 3 PW 12 O 40 Á xH 2 O was detected for loadings above 30 wt.%, as previously reported [13]. The XRD pattern of the Cs-HPA sample agreed with those reported in the literature [14].…”

Section: Catalyst Characterization and Selectionsupporting

confidence: 87%

Synthesis of Ionones by Cyclization of Pseudoionone on Solid Acid Catalysts

2008

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Ionone synthesis (a, b and c isomers) by pseudoionone cyclization was studied on zeolite HBEA, Amberlyst 35W, SiO 2 -Al 2 O 3 , and unsupported and silicasupported heteropolyacids (HPA/SiO 2 ). Ionone formation was preferentially promoted on strong Brønsted acid sites. A 79% ionone yield was obtained on 58.5 wt.% HPA/SiO 2 after 1.5 h of reaction at 383 K and 250 kPa. This value is similar to the best yields reported for the homogeneouslycatalyzed reaction using sulfuric acid.

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Section: Catalyst Characterization and Selectionsupporting

confidence: 87%

Synthesis of Ionones by Cyclization of Pseudoionone on Solid Acid Catalysts

2008

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“…Supported Cs salts of PW, Cs X H 3)X PW/SP (X = 1.5, 2.0 or 2.5), where SP stands for the support, namely DUSY or USY, were obtained by sequential impregnation and in situ reaction on the support according with the previous report [23]. In detail, Cs 2 CO 3 was supported onto SP by the incipient wetness impregnation, followed with drying at 110°C for 12 h and calcination at 550°C for 4 h. After this, PW was impregnated with excess of solution by contacting the corresponding support with the PW solution under constant stirring overnight at room temperature, followed by evaporation, drying and calcination.…”

Section: Methodsmentioning

confidence: 99%

Cs salts of 12-tungstophosphoric acid supported on dealuminated USY as catalysts for hydroisomerization of n-heptane

Wei

Ren

et al. 2007

Catal Lett

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A series of Pt-bearing dealuminated USY supported Cs salts of 12-tungstophosphoric acid (PW) catalysts were prepared and their catalytic performances were measured in the hydroisomerization of n-heptane with an atmospheric fixed-bed flow reactor. USY was found to be a poor support for Cs salts of PW, leading to a lower catalytic activity in this reaction, but dealuminated USY supported Cs salts of PW catalysts showed very high catalytic conversion and selectivity. Among the various Cs salts of PW with different Cs/P ratios, Cs 2.0 PW was revealed to be the most effective active species. Over the dealuminated USY supported catalyst with the Pt loading of 0.4 wt.% and Cs 2.0 PW loading of 10 wt.%, the conversion of n-heptane was enhanced up to 76.2% with a high selectivity to isomerized products of 92.2%.

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“…H 3 PW 12 O 40 is epitaxially deposited on the cesium salt crystallites [20][21][22][23]). Even then, the bulk material is sparingly soluble, zeolitic and protonated [37], and it is likely to form well-defined robust metal oxide environment capable of activating dispersed electrocatalytic noble metal nanocenters. Although the IR data of cesium salts indicate lower population of structural protons and their lower degree of hydration, the literature reports [13,37]are consistent with strong acidity and high proton mobility in such systems.…”

Section: Ir Characterization Of Cesium Salts Relative To Parent Polyomentioning

confidence: 99%