Microemulsion-Based Synthesis of CeO2Powders with High Surface Area and High-Temperature Stabilities

Langmuir ◽  
2004 ◽  
Vol 20 (25) ◽  
pp. 11223-11233 ◽  
Author(s):  
Ali Bumajdad ◽  
Mohamed I. Zaki ◽  
Julian Eastoe ◽  
Lata Pasupulety
Keyword(s):  
High Temperature ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area

Hard Template Route for Synthesis of Mesoporous Spinel Type Oxides with Ordered Structure

2014 ◽  
Vol 886 ◽  
pp. 200-203
Author(s):  
Wei Hua Shen
Keyword(s):  
High Temperature ◽  
Surface Area ◽  
Spinel Phase ◽  
High Surface ◽  
High Surface Area ◽  
Spherical Particles ◽  
Ordered Structure ◽  
Hard Template ◽  
Spinel Type ◽  
Spinel Oxides

The binary mesoporous spinel oxides with high surface area have been synthesized by using KIT-6 and SBA-15 as hard templates and hydrated nitrated salts as precursors. Low temperature such as 500 °C is suitable for preparation of NiCo2O4with spinel phase. High temperature such as 800 °C is necessary for preparation of NiMn2O4, MnCo2O4, and (Co0.5Mn0.5)3O4with pure spinel phase. The prepared mesoporous spinel shows high surface area as 43-105 m2/g with pore volume as0.095-0.233 cm3/g. It is preferred to form mesoporous NiCo2O4with spherical particles.

Transmission Electron Microscopy Studies of Pd Encapsulation by Ceria-Zirconia Oxides

1998 ◽  
Vol 4 (S2) ◽  
pp. 724-725
Author(s):  
J. C. Jiang ◽  
X. Q. Pan ◽  
G. W. Graham ◽  
R. W. McCabe ◽  
J. Schwank
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
High Temperature ◽  
Surface Area ◽  
High Speed ◽  
High Surface ◽  
Silicon Crystal ◽  
High Surface Area ◽  
Thermal Environments ◽  
Transmission Electron

High-temperature catalysts containing Pd supported on high-surface area ceria-zirconia are optimum materials for fuel economy when automotive engines operate under high speed or load conditions. A prerequisite for developing such thermally stable catalysts is to gain a good understanding of the thermal deactivation modes contributing to the aging and degradation of catalysts in harsh thermal environments. It was discovered by X-ray diffraction that upon hightemperature aging, Pd may sinter into large (about 10 nm diameter) particles and become encapsulated in the ceria-zirconia. To confirm this conclusion, a prototype high-temperature catalyst containing Pd supported on high-surface area ceria-zirconia, aged at temperature above 1100 °C is studied by transmission electron microscopy (TEM).The ceria-zirconia supported Pd (0.25 wt%) catalyst was aged at 1105 °C and calcined at 700 °C for 2 h. For TEM sample preparations, first of all, a large-size aggregate with diameter about 1 mm was selected and sandwiched between by two pieces of silicon crystal.

Benzofuroxans as Rubber Additives

1993 ◽  
Vol 66 (1) ◽  
pp. 61-72 ◽  
Author(s):  
Daniel F. Graves
Keyword(s):  
High Temperature ◽  
Carbon Black ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Payne Effect

Abstract Benzofurazan 1-oxide, commonly called benzofuroxan (BFO), was shown to decrease hysteresis of carbon black-filledrubber vulcanizates by as much as 30%. Presumably, BFO promotes increased bonding between the elastomerand carbon black resulting in reduced “Payne Effect” in the vulcanizate. BFO was added during the mixing of themasterbatch at various temperatures. It was found that high temperature mixing was necessary to achieve maximumhysteresis reduction and that more effect was noted with high surface area blacks. Nickel salts were found to modifythe reaction between BFO and the elastomer/black.

High temperature methanation over Ni catalysts supported on high surface area ZnxMg1-xAl2O4: Influence on Zn loading

2019 ◽  
Vol 44 (26) ◽  
pp. 13253-13261 ◽  
Author(s):  
Jingyu Zhou ◽  
Hongfang Ma ◽  
Chenxu Liu ◽  
Haitao Zhang ◽  
Weiyong Ying
Keyword(s):  
High Temperature ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Ni Catalysts
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