Grain boundary control in nanocrystalline MgO as a novel means for significantly enhancing surface basicity and catalytic activity

2009 ◽  
Vol 263 (1) ◽  
pp. 196-204 ◽  
Author(s):  
Roxana Vidruk ◽  
Miron V. Landau ◽  
Moti Herskowitz ◽  
Michael Talianker ◽  
Nahum Frage ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Grain Boundary ◽  
Boundary Control ◽  
Surface Basicity ◽  
Nanocrystalline Mgo

scholarly journals Vapor phase synthesis of glycerol carbonate over honeycomb monolith coated with zirconia based base catalysts

2018 ◽  
Vol 53 (1) ◽  
pp. 21-28
Author(s):  
VT Vasantha ◽  
SZ Mohamed Shamshuddin ◽  
M Shyamsundar ◽  
Reena Saritha Serrao ◽  
Joyce Queeny D’Souza
Keyword(s):  
Catalytic Activity ◽  
Vapor Phase ◽  
Glycerol Carbonate ◽  
Phase Synthesis ◽  
Base Catalysts ◽  
Catalytic Materials ◽  
Bed Temperature ◽  
Surface Basicity ◽  
Catalytic Material ◽  
Vapor Phase Synthesis

In this article the synthesis, characterization and catalytic activity studies of zirconia based base catalysts such as Mg(II)/ZrO2, Ca(II)/ZrO2 and Ba(II)/ZrO2 coated on honeycomb monoliths is reported. Honeycomb monoliths were coated with Mg(II)/ZrO2, Ca(II)/ZrO2, Ba(II)/ZrO2 and characterized for their physico-chemical properties such as surface basicity, crystallinity and morphology by using relevant techniques. The catalytic activity of these catalytic materials was evaluated in vapor phase synthesis of glycerol carbonate. The reaction conditions were optimized by varying reaction parameters such as nature of catalytic material, molar ratio of the reactants, catalyst bed temperature, feed-rate of the reactants and time-on-stream to obtain highest possible yield of glycerol carbonate with greater selectivity. The catalytic materials were found to be highly efficient in the synthesis of glycerol carbonate with a possible highest yield up to ~98%. These catalytic materials can be easily reactivated and reused in this reaction.Bangladesh J. Sci. Ind. Res.53(1), 21-28, 2018

Effect of TiO2 Addition of Oxidizing Catalytic Activity of an Al2O3 Slider for Magnetic Disks

1994 ◽  
Vol 116 (2) ◽  
pp. 275-279 ◽  
Author(s):  
Shinsuke Higuchi ◽  
Takeshi Miyazaki ◽  
Yasutaka Suzuki ◽  
Hideaki Tanaka ◽  
Iwao Matsuyama
Keyword(s):  
Catalytic Activity ◽  
Grain Boundary ◽  
Test System ◽  
High Catalytic Activity ◽  
Carbon Overcoat ◽  
Magnetic Disks ◽  
Tio2 Addition ◽  
Pin On Disk ◽  
Tio2 Phase ◽  
Disk Test

Oxidizing catalytic activity of a slider is a factor which could affect wear of magnetic disks with a carbon overcoat. Al2O3 composites containing 2–50 mol% TiO2 were produced, which had different oxidizing catalytic activities but nearly the same hardness and thermal conductivity. Activation energy (Ec) for carbon oxidation when it is mixed with the composite was measured to get the oxidizing catalytic activity, and it was found that Ec changed from about 70 kJ/mol for Al2O3 to about 110 kJ/mol for Al2O3 containing 9.1–16.7 mol% TiO2. TiO2 addition increased and decreased Ec. The former was due to segregation of the Ti-Al-O phase at the Al2O3 grain boundary, which could inhibit the catalysis at the Al2O3 grain boundary. The latter was due to the unreacted TiO2 phase, which by itself has high catalytic activity. TiO2-Al2O3 sliders having different Ec were examined in sliding wear against a magnetic disk with a carbon overcoat using a pin-on-disk test system. It was found that wear rate of the carbon overcoat was lower when the slider had a larger Ec, i.e., lower catalytic activity. It was also found that wear particles of the carbon overcoat were likely to be larger with lower catalytic activity.

Crystallinity and grain boundary control of TIPS-pentacene in organic thin-film transistors for the ultra-high sensitive detection of NO2

2019 ◽  
Vol 7 (33) ◽  
pp. 10196-10202 ◽  
Author(s):  
Bingyao Shao ◽  
Yiming Liu ◽  
Xinming Zhuang ◽  
Sihui Hou ◽  
Shijiao Han ◽  
...  
Keyword(s):  
Thin Film ◽  
Grain Boundary ◽  
Boundary Control ◽  
Thin Film Transistors ◽  
Limit Of Detection ◽  
Organic Thin Film Transistors ◽  
Sensitive Detection ◽  
Organic Thin Film ◽  
Solvent Engineering

Ultra-sensitive OTFT based NO2 sensors with a limit of detection of 1.93 ppb were realized by controlling and regulating the microstructures of TIPS-pentacene semiconducting films via solvent engineering.

Superconductor Flux Pinning and Grain Boundary Control

Science ◽  
1996 ◽  
Vol 274 (5288) ◽  
pp. 736-737 ◽  
Author(s):  
D. Larbalestier
Keyword(s):  
Grain Boundary ◽  
Boundary Control ◽  
Flux Pinning

Enhancement of toughness by grain boundary control in magnesium binary alloys

2014 ◽  
Vol 612 ◽  
pp. 172-178 ◽  
Author(s):  
Hidetoshi Somekawa ◽  
Alok Singh ◽  
Tadanobu Inoue
Keyword(s):  
Grain Boundary ◽  
Boundary Control ◽  
Binary Alloys
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