Isomerization of n ‐pentane over platinum promoted tungstated zirconia supported on mesoporous SBA ‐15 prepared by supercritical impregnation

2020 ◽  
Author(s):  
Wenchao Lee ◽  
Chieh‐Chao Yang ◽  
Soofin Cheng
Keyword(s):  
Tungstated Zirconia ◽  
Supercritical Impregnation

Biobased films of nanocellulose and mango leaf extract for active food packaging: Supercritical impregnation versus solvent casting

2021 ◽  
Vol 117 ◽  
pp. 106709
Author(s):  
Cristina Cejudo Bastante ◽  
Nuno H.C.S. Silva ◽  
Lourdes Casas Cardoso ◽  
Casimiro Mantell Serrano ◽  
Enrique J. Martínez de la Ossa ◽  
...  
Keyword(s):  
Food Packaging ◽  
Leaf Extract ◽  
Solvent Casting ◽  
Active Food Packaging ◽  
Supercritical Impregnation

scholarly journals Supercritical Impregnation of PLA Filaments with Mango Leaf Extract to Manufacture Functionalized Biomedical Devices by 3D Printing

Polymers ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 2125
Author(s):  
José María Rosales ◽  
Cristina Cejudo ◽  
Lidia Verano ◽  
Lourdes Casas ◽  
Casimiro Mantell ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
3D Printing ◽  
Polylactic Acid ◽  
Leaf Extract ◽  
Three Dimensional ◽  
3D Printer ◽  
Pharmacological Properties ◽  
Bioactive Properties ◽  
Supercritical Impregnation ◽  
Mango Leaves

Polylactic Acid (PLA) filaments impregnated with ethanolic mango leaves extract (MLE) with pharmacological properties were obtained by supercritical impregnation. The effects of pressure, temperature and amount of extract on the response variables, i.e., swelling, extract loading and bioactivity of the PLA filaments, were determined. The analysis of the filaments biocapacities revealed that impregnated PLA filaments showed 11.07% antidenaturant capacity and 88.13% antioxidant activity, which after a 9-day incubation shifted to 30.10% and 9.90%, respectively. Subsequently, the same tests were conducted on printed samples. Before their incubation, the printed samples showed 79.09% antioxidant activity and no antidenaturant capacity was detected. However, after their incubation, the antioxidant activity went down to only 2.50%, while the antidenaturant capacity raised up to 23.50%. The persistence of the bioactive properties after printing opens the possibility of using the functionalized PLA filaments as the feed for a three-dimensional (3D) printer.

Single Pot Catalyst Strategy to Branched Products via Adhesive Isomerization and Hydrocracking of Polyethylene over Platinum Tungstated Zirconia

2021 ◽  
pp. 120483
Author(s):  
Brandon C. Vance ◽  
Pavel A. Kots ◽  
Cong Wang ◽  
Zachary R. Hinton ◽  
Caitlin M. Quinn ◽  
...  
Keyword(s):  
Tungstated Zirconia

Alcohol Dehydration Reactions over Tungstated Zirconia Catalysts

1997 ◽  
Vol 169 (1) ◽  
pp. 67-75 ◽  
Author(s):  
Gustavo Larsen ◽  
Edgar Lotero ◽  
Lucı́a M. Petkovic ◽  
David S. Shobe
Keyword(s):  
Tungstated Zirconia ◽  
Alcohol Dehydration ◽  
Dehydration Reactions

Dehydration of Castor Oil over a NaHSO4 /MCM-41 Catalyst Prepared by Supercritical Impregnation

2018 ◽  
Vol 41 (11) ◽  
pp. 2186-2195 ◽  
Author(s):  
Jian-Fei Ding ◽  
Tian-Lin Ma ◽  
Cui-Xia Yan ◽  
Rong Shao ◽  
Wei Xu ◽  
...  
Keyword(s):  
Castor Oil ◽  
Supercritical Impregnation ◽  
Mcm 41

scholarly journals Effect of Alcohol Structure on the Kinetics of Etherification and Dehydration over Tungstated Zirconia

ChemSusChem ◽  
2018 ◽  
Vol 11 (18) ◽  
pp. 3104-3111 ◽  
Author(s):  
Julie Rorrer ◽  
Suresh Pindi ◽  
F. Dean Toste ◽  
Alexis T. Bell
Keyword(s):  
Tungstated Zirconia ◽  
Kinetics Of

The role of Promoters in Tungstated Zirconia Catalysts

2003 ◽  
Vol 9 (S03) ◽  
pp. 198-199
Author(s):  
B. Tesche ◽  
P. Lukinskas ◽  
S. Kuba ◽  
B. R. K. Graselli ◽  
Spliethoff ◽  
...  
Keyword(s):  
Tungstated Zirconia

Added-value porous materials for controlled thymol release obtained by supercritical CO2 impregnation process

2019 ◽  
Vol 38 (5-6) ◽  
pp. 153-166 ◽  
Author(s):  
Stoja Milovanovic ◽  
Darka Markovic ◽  
Jasna Ivanovic
Keyword(s):  
Pore Diameter ◽  
Operating Time ◽  
Zero Order ◽  
Average Pore Diameter ◽  
Added Value ◽  
Average Pore ◽  
First Order ◽  
Supercritical Impregnation ◽  
Bioactive Substance ◽  
Environmentally Friendly Process

This study explores utilization of biodegradable and biocompatible polymers for controlled release of natural bioactive substance. For that purpose, poly(ε-caprolactone) (PCL) beads, cellulose acetate (CA) film, and poly lactic- co-glycolic acid (PLGA) flakes were impregnated with thymol by employing environmentally friendly process of supercritical carbon dioxide (scCO2) impregnation. At selected pressure and temperature, prolongation of operating time increased thymol loading. Pure scCO2 did not affect CA film with average pore diameter of approximately 3 µm, while it enabled change of PCL beads and PLGA flakes into foams with average pore diameter approximately 175 µm and 87 µm, respectively. Additionally to scCO2, thymol acted as a plasticizer increasing pore size of polymers up to three times. Kinetic of thymol release from selected samples was tested using phosphate buffer saline at 37°C and successfully described with Korsmeyer–Peppas, zero-order, first-order, and Higuchi models. The suggested method of PCL, CA, and PLGA supercritical impregnation led to development of porous, solvent free, added-value materials that release thymol in a controlled manner from 5 h to several days.

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