H3PW12O40/SiO2 for sorbitol dehydration to isosorbide: High efficient and reusable solid acid catalyst

Abstract

Tungstophosphoric acids (PW) supported on various metal oxides (SiO 2 , γ-Al 2 O 3 , TiO 2 , ZrO 2 and CeO 2 ) were synthesized and used as catalysts for sorbitol dehydration to isosorbide for the first time. 30% PW/SiO 2 exhibited the best catalytic performance for sorbitol dehydration, over which 56% isosorbide selectivity could be gained at a 95% sorbitol conversion at 250 o C. The catalytic performance of regenerated 30% PW/SiO 2 catalysts by dichloromethane elution showed no loss after recycling five runs. Characterizations with UV-Vis, XRD, NH 3 -TPD and thermal analysis techniques revealed that PW had a good dispersion, and the primary Keggin structure was preserved after supporting PW on different supports. The interaction between PW and oxides resulted in different acidity of catalysts, which affected conversion of sorbitol and selectivity for isosorbide. The final acidity order of supported PW catalysts was the following: SiO 2 >γ-Al 2 O 3 >TiO 2 ≈ZrO 2 >CeO 2 .

Isosorbide as a Renewable Platform chemical for Versatile Applications—Quo Vadis?

“…[4] The reaction can be performed by using homo-or heterogeneous acidic catalysts such as those reported by Sun et al, who used a silicasupported heteropolyacid. [27] Yamaguchi et al have reported catalyst-free dehydration at elevated temperatures in water to obtain isosorbide in high yields. [28] They ascribed the success to the higher concentration of hydronium and hydroxide ions at higher temperatures owing to the temperature-dependent autoprotolysis of water.…”

Transformation of Sorbitol to Biofuels by Heterogeneous Catalysis: Chemical and Industrial Considerations

“…For example, Li et al [50] observed deactivation of tungstated zirconia (fixed bed reaction at 245°C, 15%WO 3 -ZrO 2 ) while Weingarten et al [60] did not observe modification of the tungstated zirconia during the post-test analysis of the fructose dehydration (reaction in batch reactor at 160°C: 15%WO 3 -ZrO 2 ). Sun et al [61] deposited phosphotungstic acid particles (H 3 PW 12 O 40 ) on different non-acidic supports to convert sorbitol into isosorbide.…”

An eco-friendly procedure for the efficient synthesis of diethyl α-aminophosphonates in aqueous media using natural acids as a catalyst

“…Development of non-hazardous synthetic methodologies for organic reactions is one of the latest challenges to organic chemists. Now, there is a need to develop new methodology in all areas of chemistry, like use of catalysts in organic synthesis process, and the growing concern for environmental demands the development of eco-friendly and economic processes wherein even less hazardous byproducts are not desirable, for example the use of high efficient and reusable solid acid catalyst such as H 3 PW 12 O 40 /SiO 2 for sorbitol dehydration to isosorbide [21], H 3 PW 12 O 40 /CeXZr 1−X O 2 catalysts [22], and ultrasound in chemical processes [23].…”