Nonstoichiometric calcium pyrophosphate: a highly efficient and selective catalyst for dehydration of lactic acid to acrylic acid

RSC Advances ◽  
2014 ◽  
Vol 4 (63) ◽  
pp. 33319-33326 ◽  
Author(s):  
Vidhya C. Ghantani ◽  
Mohan K. Dongare ◽  
Shubhangi B. Umbarkar
Keyword(s):  
Lactic Acid ◽  
Acrylic Acid ◽  
Catalyst Surface ◽  
Calcium Pyrophosphate ◽  
Calcium Lactate ◽  
Acid Yield ◽  
Selective Catalyst ◽  
Highly Efficient

Lactic acid dehydration using a non-stoichiometric calcium pyrophosphate catalyst (Ca/P ratio 0.78) has resulted in 78% acrylic acid yield due to formation of calcium lactate as an intermediate on the catalyst surface.

Na2HPO4-modified NaY nanocrystallites: efficient catalyst for acrylic acid production through lactic acid dehydration

2014 ◽  
Vol 4 (5) ◽  
pp. 1376-1385 ◽  
Author(s):  
Junfeng Zhang ◽  
Yuling Zhao ◽  
Xinzhen Feng ◽  
Min Pan ◽  
Jing Zhao ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Acrylic Acid ◽  
Acid Production ◽  
Surface Acidity ◽  
Formation Rate ◽  
Structural Features ◽  
Efficient Catalyst ◽  
Acid Yield

An acrylic acid yield of 74.3% and a formation rate of 12.0 mmol gcat−1 h−1 have been achieved at 340 °C by lactic acid dehydration over Na2HPO4-modified NaY nanocrystallites (NaY-n) due to appropriate surface acidity together with the unique structural features of NaY-n.

Physicochemical and Catalytic Properties of Spinels Formed by Solid-Solid Interaction Between Fe2O3and V2O5

1996 ◽  
Vol 61 (8) ◽  
pp. 1131-1140 ◽  
Author(s):  
Abd El-Aziz Ahmed Said
Keyword(s):  
Vanadium Oxide ◽  
Active Sites ◽  
Catalyst Surface ◽  
Catalytic Properties ◽  
Flow System ◽  
Oxide Catalysts ◽  
X Ray Diffraction ◽  
Selective Catalyst ◽  
X Ray ◽  
Solid Catalysts

Vanadium oxide catalysts doped or mixed with 1-50 mole % Fe3+ ions were prepared. The structure of the original samples and those calcined from 200 up to 500 °C were characterized by TG, DTA, IR and X-ray diffraction. The SBET values and texture of the solid catalysts were investigated. The catalytic dehydration-dehydrogenation of isopropanol was carried out at 200 °C using a flow system. The results obtained showed an observable decrease in the activity of V2O5 on the addition of Fe3+ ions. Moreover, Fe2V4O13 is the more active and selective catalyst than FeVO4 spinels. The results were correlated with the active sites created on the catalyst surface.

scholarly journals Use of wheat straw and chicken feather hydrolysates as a complete medium for lactic acid production

2018 ◽  
Vol 36 (No. 2) ◽  
pp. 146-153 ◽  
Author(s):  
Gharwalová Lucia ◽  
Paulová Leona ◽  
Patáková Petra ◽  
Branská Barbora ◽  
Melzoch Karel
Keyword(s):  
Lactic Acid ◽  
Wheat Straw ◽  
Acid Production ◽  
Low Cost ◽  
Lactic Acid Production ◽  
Nitrogen Sources ◽  
Batch Process ◽  
Complete Medium ◽  
Biotechnological Production ◽  
Acid Yield

Biotechnological production of lactic acid has experienced a boom that is hindered only by the lack of low-cost, abundant material that might be used as a substrate for lactic acid bacteria. Such material should contain not only carbon but also complex nitrogen sources, amino acids and vitamins necessary for the balanced growth of the bacteria. Here, for the first time, a combination of hydrolysates of wheat straw and chicken feathers was used as a complete waste cultivation medium for lactic acid production. It was shown to be a promising substrate for lactic acid production, reducing the medium price by 73% compared with MRS broth, providing more than 98% lactic acid yield and high productivity (2.28 ± 0.68 g/l/h) in a fed-batch process using Lactobacillus reuterii LHR14.

scholarly journals Lactic Acid Conversion to Acrylic Acid Over Fluoride-Substituted Hydroxyapatites

2020 ◽  
Vol 8 ◽  
Author(s):  
Robert Wojcieszak ◽  
Thomas Bonnotte ◽  
Sébastien Paul ◽  
Benjamin Katryniok ◽  
Franck Dumeignil
Keyword(s):  
Lactic Acid ◽  
Acrylic Acid

Catalytic dehydration of lactic acid to acrylic acid using calcium hydroxyapatite catalysts

2013 ◽  
Vol 15 (5) ◽  
pp. 1211 ◽  
Author(s):  
Vidhya C. Ghantani ◽  
Samadhan T. Lomate ◽  
Mohan K. Dongare ◽  
Shubhangi B. Umbarkar
Keyword(s):  
Lactic Acid ◽  
Acrylic Acid ◽  
Calcium Hydroxyapatite

Selective catalytic oxidation of sugar alcohols to lactic acid

2015 ◽  
Vol 17 (1) ◽  
pp. 594-600 ◽  
Author(s):  
Michael G. Manas ◽  
Jesús Campos ◽  
Liam S. Sharninghausen ◽  
Elisa Lin ◽  
Robert H. Crabtree
Keyword(s):  
Lactic Acid ◽  
Catalytic Oxidation ◽  
Hydrogen Gas ◽  
Sugar Alcohols ◽  
Iridium Catalysts ◽  
Selective Conversion ◽  
Highly Efficient ◽  
Selective Catalytic Oxidation

Homogeneous iridium catalysts are reported for the highly efficient and selective conversion of polyols to hydrogen gas and lactic acid.

Oxidation Kinetics of 1,2-Propanediol in the Presence of Pd and Pt Catalysts

2020 ◽  
Vol 850 ◽  
pp. 48-53
Author(s):  
Svetlana Chornaja ◽  
Svetlana Zhizhkuna ◽  
Jevgenija Vladiko ◽  
Reinis Drunka ◽  
Aija Krūmiņa
Keyword(s):  
Lactic Acid ◽  
Molecular Oxygen ◽  
Selective Oxidation ◽  
Oxidation Kinetics ◽  
Main Product ◽  
Pt Catalysts ◽  
Acid Yield ◽  
Active Metal ◽  
Oxidation Parameters ◽  
Kinetics Of

1.25 – 5wt%Pt/Al2O3, 1.25 – 5wt%Pd/Al2O3, 1wt%Pd/TiO2, 1 – 5wt%Pd/TiO2-NF, 1.25wt%Pt+1.25wt%Pd/Al2O3, 5wt%Pt/SiO2, 5wt%Pt/C catalysts were synthesised and tested in the selective oxidation of 1,2-propanediol by molecular oxygen. It was found that all catalysts were active in alkaline water solutions; lactic acid was obtained as the main product of the reaction. The conversion of 1,2-propandiol and the yield of lactic acid depended on the content of active metal in the catalysts. The most active for the oxidation of 1,2-propandiol were palladium-containing catalysts supported on TiO2 nanofibers (Pd/TiO2-NF). The highest 1,2-propanediol conversion (100 %) and lactic acid yield (96 %) were obtained using the 5wt%Pd/TiO2-NF catalyst at the following oxidation parameters: c0(1,2-propanediol) = 0.3 mol/L, P(O2) = 1 atm, n (1,2-propanediol)/n (Pd) = 500 mol/mol, t = 60 °C, c0(NaOH) = 1.5 mol/L.

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