Novelties of combustion synthesized and functionalized solid superacid catalysts in selective isomerization of styrene oxide to 2-phenyl acetaldehyde

2013 ◽  
Vol 207 ◽  
pp. 145-152 ◽  
Author(s):  
Ganapati D. Yadav ◽  
Bapu A. Gawade
Keyword(s):  
Styrene Oxide ◽  
Solid Superacid ◽  
Superacid Catalysts ◽  
Phenyl Acetaldehyde

5629257 Solid superacid catalysts comprising platinum metal

1997 ◽  
Vol 125 (2-3) ◽  
pp. 155
Author(s):  
Benjamin S Umansky ◽  
Manoj Bhinde ◽  
Chao-Yang Hsu ◽  
Chen-Sh Huang
Keyword(s):  
Platinum Metal ◽  
Solid Superacid ◽  
Superacid Catalysts

Isomerization of Styrene Oxide to Phenyl Acetaldehyde over Different Modified Beta Zeolites

2017 ◽  
Vol 147 (6) ◽  
pp. 1523-1532 ◽  
Author(s):  
Xiong-Fei Zhang ◽  
Jianfeng Yao ◽  
Xiaoxia Yang
Keyword(s):  
Styrene Oxide ◽  
Beta Zeolites ◽  
Phenyl Acetaldehyde

Preparation of solid superacid catalysts by chemical modification of oxides. II.

1991 ◽  
Vol 56 (7) ◽  
pp. 1417-1426
Author(s):  
Tomáš Hochmann ◽  
Karel Setínek
Keyword(s):  
Catalytic Activity ◽  
Chemical Modification ◽  
Lewis Acids ◽  
Solid Superacid ◽  
Acid Properties ◽  
Hydrocarbon Reactions ◽  
Superacid Catalysts

Acid properties of the oxides Al2O3, SiO2, TiO2, SnO2, Sb2O3, ZrO2 and ZrSiO4 were modified by the action of Lewis acids. The acids ( AlCl3, TiCl4, PCl5, SbF5 and P2O5) were deposited on the oxides by sublimation at 150, 250 and 350°C. The strength and number of acid centres of the prepared catalysts and their catalytic activity in hydrocarbon reactions were determined.

Preparation of solid superacid catalysts by chemical modification of oxides. I.

1991 ◽  
Vol 56 (7) ◽  
pp. 1404-1416 ◽  
Author(s):  
Tomáš Hochmann ◽  
Karel Setínek
Keyword(s):  
Chemical Modification ◽  
Aqueous Solutions ◽  
Solid Acid ◽  
Solid Acid Catalysts ◽  
Acid Catalysts ◽  
Solid Superacid ◽  
Hydrocarbon Reactions ◽  
Superacid Catalysts

Properties of solid acid catalysts prepared by modification of oxides have been examined. The oxides Al2O3, SiO2, TiO2, SnO2, Sb2O3, ZrO2 and ZrSiO4 were impregnated by aqueous solutions of H2SO4, H3PO4, NH4F and NH4Cl, respectively, and calcined at 500, 650 and 800°C. For the so prepared catalysts, the strength and number of their acid centres and their activity for hydrocarbon reactions were determined.

Influence of Preparation Conditions on the Acidity of WO3/ZrO2 Solid Superacid

2011 ◽  
Vol 233-235 ◽  
pp. 1502-1506 ◽  
Author(s):  
Ping Xu ◽  
Min Wei Wang ◽  
Jia Wei Qu ◽  
Ren Lang Wang ◽  
Jian Wang
Keyword(s):  
Lewis Acid ◽  
Acid Sites ◽  
Acid Strength ◽  
Lewis Acid Sites ◽  
Solid Superacid ◽  
Preparation Conditions ◽  
Acid Type ◽  
Loading Amount ◽  
Superacid Catalysts ◽  
Adsorption Desorption

WO3/ZrO2 solid superacid catalysts were prepared by coprecipitation and impregnation, then were characterized by XRD, N2 adsorption-desorption, Hammett indicator and pyridine chemisorption IR. The acid strength, acid type, acid volume, etc were compared under the different preparation conditions. The results indicated that the catalyst prepared by coprecipitation had stronger acid strength than the catalyst prepared by impregnation. The samples prepared by impregnation had more Lewis acid sites. With the increasing of the W/Zr ratio, the acid strength tended to increase at first and then decrease, and the catalyst with 10% WO3 loading amount had the strongest acidity. The higher the calcination temperature, the less the Lewis acid sites.

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