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We have presented the preparation of nanosized cerium
hydroxide and CeO2 nanoparticles by inverse microemulsion
technique using a non-ionic surfactant followed by thermal
treatment at 100¨C600 1C. Due to the low viscosities of inverse
microemulsions, our approach is suitable for the direct impregnation
of porous SiC materials with well-defined ceria nanoparticles.
A fundamental question is the size dependence of the
catalytic activity, which can be addressed using inverse microemulsions
due to the adjustable size of particles. The micelle and
the particle size could be controlled in the narrow range of
5¨C16 nm varying the molar water to surfactant ratio from 5.8 to
16.4. The evaluation of micelle and particle sizes with comprehensive
DLS and SAXS techniques for the first time confirms an
increasing size with increasing RW value. Crystallite sizes of ceria
particles annealed at 100 and 400 1C with 6¨C16 nm show good
agreement to sizes estimated for cerium hydroxide nanoparticles.
For the first time, catalytic activity of microemulsion-derived ceria
nanoparticles was studied in the soot combustion reaction,
demonstrating higher catalytic activity of 400 1C treated samples
(TMax   404 1C) compared to 600 1C (TMax   461 1C) caused by
smaller crystallite sizes. During the first catalytic cycles, partic
legrowth and sintering processes lead to crystallite sizes up to
31nm after the TPO. This effect can explain the decreasing activity
in the second cycle (TMax   514 1C). Our study shows the
importance and need for encapsulation of catalytically active
species for industrial applications.
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Originally posted by С¼×009 at 2009-11-13 10:58:
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onlliu

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С¼×009(½ð±Ò+20,VIP+0): 11-15 09:06
ÏÈÒëÒ»¶Î

We have presented the preparation of nanosized cerium hydroxide and CeO2 nanoparticles by inverse microemulsion technique using a non-ionic surfactant followed by thermal treatment at 100¨C600 1C. Due to the low viscosities of inverse
microemulsions, our approach is suitable for the direct impregnation of porous SiC materials with well-defined ceria nanoparticles.

ÎÒÃÇÒѾ­Ìá³öͨ¹ý²ÉÓ÷ÇÀë×Ó±íÃæ»îÐÔ¼ÁµÄ·´Ïà΢Èé¼Á¼¼Êõ,½ô½Ó100-600ÉãÊ϶ȵÄÈÈ´¦ÀíÀ´ÖƱ¸ÄÉÃ׳ߴçµÄÇâÑõ»¯îæºÍ¶þÑõ»¯îæÄÉÃ×Á£×Ó.ÓÉÓÚ·´Ïà΢Èé¼ÁµÄÕ³¶ÈµÍ,ÎÒÃǵķ½·¨ÊʺÏÓÃÂÖÀªÇåÎúµÄÑõ»¯îæÄÉÃ×Á£×Ó¶Ô¶à¿×̼»¯¹è²ÄÁϽøÐÐÖ±½ÓÉøÍ¸.

A fundamental question is the size dependence of the catalytic activity, which can be addressed using inverse microemulsions due to the adjustable size of particles. The micelle and the particle size could be controlled in the narrow range of 5¨C16 nm varying the molar water to surfactant ratio from 5.8 to 16.4.

Ò»¸ö¸ù±¾ÎÊÌâÊÇ(¿ÅÁ£)´óСÓë´ß»¯»îÐÔÖ®¼äµÄÏà¹ØÐÔ,ÕâÖÖÏà¹ØÐÔ¿ÉÒÔÓ÷´Ïà΢Èé¼ÁÀ´½âÊÍ,ÒòΪ¿ÅÁ£´óСÊǿɵ÷µÄ.ËæË®¶Ô±íÃæ»îÐÔ¼ÁµÄĦ¶û±È´Ó5.8-16.4±ä»¯,½ºÊøºÍ¿ÅÁ£³ß´ç¿ÉÒÔ¿ØÖÆÔÚ5-16ÄÉÃ×µÄÏÁÕ­·¶Î§ÄÚ.

[ Last edited by onlliu on 2009-11-13 at 19:57 ]
5Â¥2009-11-13 16:47:45
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onlliu

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С¼×009(½ð±Ò+29,VIP+0): 11-15 09:07
½Ó×ÅÀ´

The evaluation of micelle and particle sizes with comprehensive DLS and SAXS techniques for the first time confirms an increasing size with increasing RW value. Crystallite sizes of ceria particles annealed at 100 and 400 1C with 6¨C16 nm show good agreement to sizes estimated for cerium hydroxide nanoparticles.

ÓÃ×ۺϵÄDLSºÍSAXS¼¼Êõ¶Ô½ºÊøºÍ¿ÅÁ£³ß´ç½øÐÐÆÀ¶¨,Ê×´Î֤ʵÁ˳ߴçËæRWÖµµÄÔö¼Ó¶øÔö¼Ó. ÔÚ100ºÍ400ÉãÊ϶ÈÏÂÍË»ð,³ß´çΪ6-16ÄÉÃ×µÄÑõ»¯îæ¿ÅÁ£µÄ΢¾§³ß´çͬ¹À¼ÆµÄÇâÑõ»¯îæÄÉÃ׿ÅÁ£³ß´çÓÐÁ¼ºÃµÄÒ»ÖÂÐÔ.

For the first time, catalytic activity of microemulsion-derived ceria nanoparticles was studied in the soot combustion reaction, demonstrating higher catalytic activity of 400 1C treated samples (TMax   404 1C) compared to 600 1C (TMax   461 1C) caused by
smaller crystallite sizes. During the first catalytic cycles, partic legrowth and sintering processes lead to crystallite sizes up to 31nm after the TPO.

Ê×´ÎÔÚúÑÌȼÉÕ·´Ó¦ÖжÔ΢Èé¼ÁÑÜÉú¶þÑõ»¯îæÄÉÃ׿ÅÁ£µÄ´ß»¯»îÐÔ½øÐÐÁËÑо¿,
Ö¤Ã÷ÁËÏà±ÈÓÚÓɽÏС΢¾§³ß´çÒýÆðµÄÔÚ600ÉãÊ϶È(×î´óζÈ461¶È)(´¦ÀíµÄÑùÆ·),
ÔÚ400ÉãÊ϶È(×î¸ßζÈ404¶È)´¦ÀíµÄÑùÆ·µÄ´ß»¯»îÐÔ¸ü¸ß.

This effect can explain the decreasing activity in the second cycle (TMax   514 1C). Our study shows the importance and need for encapsulation of catalytically active
species for industrial applications.

ÕâһЧӦÄܹ»½âÊ͵ڶþÖÜÆÚÖÐ(×î¸ßζÈ514ÉãÊ϶È)²»¶Ï½µµÍµÄ»îÐÔ.
ÎÒÃǵÄÑо¿ÏÔʾÁ˶ÔÓÚ¹¤ÒµÓ¦ÓõĴ߻¯»îÐÔÖÖÀàµÄÃÜ·âÐèÒªºÍÖØÒªÐÔ.

[ Last edited by onlliu on 2009-11-13 at 20:24 ]
6Â¥2009-11-13 17:13:34
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