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.

The Study on Solid Superacid Synthesis of K12A with Manufacturing Equipment

2012 ◽  
Vol 583 ◽  
pp. 285-288
Author(s):  
Dong Mei Zhao ◽  
Xue Peng Liu
Keyword(s):  
Catalytic Activity ◽  
Metal Oxide ◽  
Design Method ◽  
Orthogonal Design ◽  
Manufacturing Equipment ◽  
Solid Superacid ◽  
Orthogonal Design Method ◽  
Superacid Catalyst ◽  
Calcined Temperature ◽  
Very High

By orthogonal design method, Catalytic activity of /ZrO2 solid superacid is studied, and the influence of catalyst characteristic and structure by manufacturing equipment is issued. It is concluded that the best prepared conditions of the superacid catalyst /ZrO2 for the synthesis of Octyl-Polyglycoside are followed:(1) PH=9.5; (2) calcined temperature at 500; (3) M(H2SO4)=0.5mol/L. Using this kind of catalyst the conversion of glueoside may reach as high as 96% in the synthesis of OCtyl-Polyglycoside and the selectivity is very high for the synthesis of Octyl-Polyglycoside. By introducing other metal oxide, the catalytic activity of complex solid superacid is studied.

Lewis Acid-Promoted Suzuki Reaction using Palladium Chloride Anchored on a Polymer as a Catalyst

2008 ◽  
Vol 61 (8) ◽  
pp. 610 ◽  
Author(s):  
Guozhi Fan ◽  
Hanjun Zhang ◽  
Siqing Cheng ◽  
Zhandong Ren ◽  
Zhijun Hu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Lewis Acid ◽  
Lewis Acids ◽  
Heterogeneous Catalysts ◽  
Suzuki Reaction ◽  
Cross Coupling ◽  
Palladium Chloride ◽  
Coupling Reactions ◽  
Cross Coupling Reactions ◽  
Recoverable Catalyst

Palladium chloride anchored on polystyrene modified by 5-amino-1,10-phenanthroline was prepared and used as an efficient recoverable catalyst for Suzuki cross-coupling reactions. The heterogeneous catalysts can be easily separated from the reaction mixture and reused for five cycles without significant Pd leaching and loss of catalytic activity. Rate enhancement in the Suzuki reaction by Lewis acids was also studied.

scholarly journals Hydrothermal Catalytic Conversion of Glucose into Lactic Acid with Acidic MIL-101(Fe)

2020 ◽  
Vol 2020 ◽  
pp. 1-7
Author(s):  
Xiaofang Liu ◽  
Zhigang Liu ◽  
Qiuyun Zhang ◽  
Hongguo Wu ◽  
Rui Wang
Keyword(s):  
Catalytic Activity ◽  
Lactic Acid ◽  
Reaction Time ◽  
Specific Surface ◽  
Catalytic Conversion ◽  
Temperature Reaction ◽  
Reaction Parameters ◽  
Acid Properties ◽  
Catalyst Reusability ◽  
First Time

MIL-101(Fe) was explored for the first time for the catalytic conversion of glucose into lactic acid (LA). The as-synthesized MIL-101(Fe) was successfully characterized, and its higher specific surface area, porosity, and feasible acid properties were confirmed to determine the remarkable catalytic activity in glucose-to-LA conversion (up to 25.4% yield) compared with other catalysts like MIL-101(Cr, Al) and UiO-66(Zr). The reaction parameters including temperature, reaction time, and substrate species as well as catalyst reusability were discussed.

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

Chemical modification of stem bromelain with anhydride groups to enhance its stability and catalytic activity

2010 ◽  
Vol 63 (3-4) ◽  
pp. 188-193 ◽  
Author(s):  
Yong Xue ◽  
Cheng-Yao Wu ◽  
Christopher J. Branford-White ◽  
Xin Ning ◽  
Hua-Li Nie ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Chemical Modification ◽  
Stem Bromelain
Sign in / Sign up

Export Citation Format

Share Document