Enhanced glycerol dehydration of pervaporation cross‐linked PVA membranes modified by VUV / UV‐C treatments

2021 ◽  
pp. 50723
Author(s):  
Claudio W. Backes ◽  
Daniel E. Weibel
Keyword(s):  
Glycerol Dehydration ◽  
Uv C

Polyphenols and their antioxidant activity in callus-cultured Malva neglecta cells under UV-B and UV-C irradiation

Planta Medica ◽  
2011 ◽  
Vol 77 (12) ◽  
Author(s):  
F Ghanati ◽  
F Khatami
Keyword(s):  
Antioxidant Activity ◽  
Uv C

Interexperimental and Interindividual Variations of DNA Repair Capacities After UV-B and UV-C Irradiations of Human Keratinocytes and Fibroblasts

2004 ◽  
Vol 79 (3) ◽  
pp. 286 ◽  
Author(s):  
Marjorie Chazal ◽  
Emeric Roux ◽  
Claire Alapetite ◽  
Christophe Roulin ◽  
Ethel Moustacchi ◽  
...  
Keyword(s):  
Dna Repair ◽  
Human Keratinocytes ◽  
Interindividual Variations ◽  
Uv C

Design and characterization of a low-optical-loss UV-C laser diode

2020 ◽  
Vol 59 (9) ◽  
pp. 094001 ◽  
Author(s):  
Ziyi Zhang ◽  
Maki Kushimoto ◽  
Tadayoshi Sakai ◽  
Naoharu Sugiyama ◽  
Leo J. Schowalter ◽  
...  
Keyword(s):  
Laser Diode ◽  
Optical Loss ◽  
Uv C

Color of ‘Bengal’ Litchis After Exposure to UV-C Light and Refrigerated Storage

2014 ◽  
Vol 4 (3) ◽  
pp. 183-187
Author(s):  
Karina Furlaneto ◽  
Juliana Ramos ◽  
Érica Daiuto ◽  
Érika Fujita ◽  
Veridiana Mendonca ◽  
...  
Keyword(s):  
Refrigerated Storage ◽  
Uv C

Research on Faulty Insulators’ Degradation Detection in Transformer Substation Based on UV-C Pulse

2018 ◽  
Vol 11 (2) ◽  
pp. 149-152
Author(s):  
Cheng Jiangzhou ◽  
Wang Zhuoyuan ◽  
Wei Yewen ◽  
Sun Jing ◽  
Wang Canxia ◽  
...  
Keyword(s):  
Transformer Substation ◽  
Uv C

Environmental aspects of UV-C-based processes for the treatment of oxytetracycline in water

2021 ◽  
Vol 277 ◽  
pp. 116797
Author(s):  
Vladimir Stankov ◽  
Mirjana Novak Stankov ◽  
Matija Cvetnić ◽  
Marija Sigurnjak Bureš ◽  
Šime Ukić ◽  
...  
Keyword(s):  
Environmental Aspects ◽  
Uv C

scholarly journals Glycerol Hydrogenolysis with In Situ Hydrogen Produced via Methanol Steam Reforming: The Promoting Effect of Pd on a Cu/ZnO/Al2O3 Catalyst

Catalysts ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 110
Author(s):  
Yuanqing Liu ◽  
Chau T. Q. Mai ◽  
Flora T. T. Ng
Keyword(s):  
Steam Reforming ◽  
Catalyst Activity ◽  
Promoting Effect ◽  
Glycerol Conversion ◽  
Glycerol Hydrogenolysis ◽  
Glycerol Dehydration ◽  
Effect Of Pd ◽  
Al2o3 Catalyst ◽  
Reaction Equilibrium

The glycerol hydrogenolysis to produce 1,2-propanediol without using externally supplied hydrogen was investigated using methanol present in crude glycerol to provide in situ hydrogen via its steam reforming reaction. This paper focuses on the promoting effect of Pd on the reactivity of a Cu/Zn/Al2O3 catalyst. Adding 2 wt% Pd onto a Cu/ZnO/Al2O3 catalyst significantly improved the selectivity to 1,2-propanediol from 63.0% to 82.4% and the glycerol conversion from 70.2% to 99.4%. This enhancement on the catalytic activity by Pd is mainly due to the improved hydrogenation of acetol, which is the intermediate formed during the glycerol dehydration. The rapid hydrogenation of acetol can shift the reaction equilibrium of glycerol dehydration forward resulting in a higher glycerol conversion. The improved reducibility of the catalyst by Pd allows the catalyst to be reduced in situ during the reaction preventing any loss of catalyst activity due to any potential oxidation of the catalyst. The catalyst was slightly deactivated when it was firstly recycled resulting in a 5.4% loss of glycerol conversion due to the aggregation of Cu and the deactivation became less noticeable upon further recycling.

scholarly journals Insight into Active Centers and Anti-Coke Behavior of Niobium-Containing SBA-15 for Glycerol Dehydration

Catalysts ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 488
Author(s):  
Katarzyna Stawicka ◽  
Maciej Trejda ◽  
Maria Ziolek
Keyword(s):  
Coke Formation ◽  
Catalytic Performance ◽  
Acid Sites ◽  
Silica Matrix ◽  
High Concentration ◽  
Active Centers ◽  
Acidic Sites ◽  
Glycerol Dehydration ◽  
Adsorption Desorption ◽  
Insight Into

Niobium containing SBA-15 was prepared by two methods: impregnation with different amounts of ammonium niobate(V) oxalate (Nb-15/SBA-15 and Nb-25/SBA-15 containing 15 wt.% and 25 wt.% of Nb, respectively) and mixing of mesoporous silica with Nb2O5 followed by heating at 500 °C (Nb2O5/SBA-15). The use of these two procedures allowed obtaining materials with different textural/surface properties determined by N2 adsorption/desorption isotherms, XRD, UV-Vis, pyridine, and NO adsorption combined with FTIR spectroscopy. Nb2O5/SBA-15 contained exclusively crystalline Nb2O5 on the SBA-15 surface, whereas the materials prepared by impregnation had both metal oxide and niobium incorporated into the silica matrix. The niobium species localized in silica framework generated Brønsted (BAS) and Lewis (LAS) acid sites. The inclusion of niobium into SBA-15 skeleton was crucial for the achievement of high catalytic performance. The strongest BAS were on Nb-25/SBA-15, whereas the highest concentration of BAS and LAS was on Nb-15/SBA-15 surface. Nb2O5/SBA-15 material possessed only weak LAS and BAS. The presence of the strongest BAS (Nb-25/SBA-15) resulted in the highest dehydration activity, whereas a high concentration of BAS was unfavorable. Silylation of niobium catalysts prepared by impregnation reduced the number of acidic sites and significantly increased acrolein yield and selectivity (from ca. 43% selectivity for Nb-25/SBA-15 to ca. 61% for silylated sample). This was accompanied by a considerable decrease in coke formation (from 47% selectivity for Nb-25/SBA-15 to 27% for silylated material).

scholarly journals Auswirkungen desinfizierender UV-C-Bestrahlung testen

2021 ◽  
Vol 61 (S2) ◽  
pp. 24-27
Author(s):  
Matthew McGreer
Keyword(s):  
Uv C
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