| ²é¿´: 381 | »Ø¸´: 10 | |||
| µ±Ç°Ö÷ÌâÒѾ´æµµ¡£ | |||
dervish½ð³æ (ÕýʽдÊÖ)
|
[½»Á÷]
¡¾´ß»¯½øÕ¹¡¿Snapshots of Working Catalysts
|
||
|
Snapshots of Working Catalysts Vanadium phosphates (VPOs) are used industrially to catalyze the partial oxidation of n-butane to maleic anhydride, which is then used as a starting material for products such as resins and lubricants. However, the reaction proceeds at elevated temperatures (in excess of 400¡ãC), and VPO phases stable under those conditions will transform to other phases at ambient conditions, so an understanding of this catalyst demands that it be studied near its working conditions. Conte et al. (p. 1270) have used powder x-ray diffraction, as well as laser Raman spectroscopy and electron paramagnetic resonance spectroscopy, to determine the transformation of VPO phases as a function of temperature and with various reactants and products present over the catalyst. They conclude that the presence of the reactants rapidly converts -VOPO4 to -VOPO4, but that the initial formation of the phase may create the V5 sites associated with increased catalytic activity. Ïà¹ØÎÄÕÂÏÂÔØ£º http://www.box.net/public/3h5dlh7o7t [ Last edited by berlin on 2006-11-13 at 17:27 ] |
» ²ÂÄãϲ»¶
ºÓÄÏÀí¹¤´óѧ»¯Ñ§»¯¹¤Ñ§ÔºÕÐÊÕ˶ʿ
ÒѾÓÐ0È˻ظ´
¹ú¼Ò´óÈ˲ſÎÌâ×éÕÐÊÕ»¯Ñ§¡¢²ÄÁÏ»¯¹¤Àà2026Äêµ÷¼ÁÉú
ÒѾÓÐ0È˻ظ´
ÎïÀí»¯Ñ§ÂÛÎÄÈóÉ«/·ÒëÔõôÊÕ·Ñ?
ÒѾÓÐ230È˻ظ´
¹ú¼Ò´óÈ˲ſÎÌâ×éÕÐÊÕ»¯Ñ§¡¢²ÄÁÏ»¯¹¤Àà2026Äêµ÷¼ÁÉú
ÒѾÓÐ0È˻ظ´
¹ú¼Ò´óÈ˲ſÎÌâ×éÕÐÊÕ»¯Ñ§¡¢²ÄÁÏ»¯¹¤Àà2026Äêµ÷¼ÁÉú
ÒѾÓÐ0È˻ظ´
»´±±Ê¦·¶´óѧ »¯Ñ§Ó뻯¹¤¿ÆÑ§Ñ§Ôº2026Äê˶ʿÑо¿ÉúÕÐÉú µ÷¼ÁÐÅÏ¢¹«¸æ
ÒѾÓÐ1È˻ظ´
»´±±Ê¦·¶´óѧ »¯Ñ§Ó뻯¹¤¿ÆÑ§Ñ§Ôº µç´ß»¯¿ÎÌâ×黹ÓÐ1Ãû˶ʿÑо¿ÉúÕÐÉúÃû¶î
ÒѾÓÐ0È˻ظ´
Ó¢ÎÄÆÚ¿¯ÇóÖú
ÒѾÓÐ2È˻ظ´
»¯Ñ§Ïà¹ØË¶Ê¿Ñо¿ÉúÕÐÊÕµ÷¼Á-ºþ±±Ê¦·¶´óѧ £¨¿ìÀ´¼ñ©£¬×îе÷¼ÁÐÅÏ¢£¬¹ý¹ú¼ÒÏß¼´¿É£©
ÒѾÓÐ1È˻ظ´
ºÓÄÏÀí¹¤´óѧ»¯Ñ§»¯¹¤Ñ§ÔºÕÐÊÕѧ˶µ÷¼ÁÉú
ÒѾÓÐ0È˻ظ´
ºÚÁú½¿Æ¼¼´óѧ»¯¹¤ »·¾³¹¤³Ìµ÷¼Á
ÒѾÓÐ11È˻ظ´

rabbit7708
ÈÙÓþ°æÖ÷ (Ö°Òµ×÷¼Ò)
Ðijæ
- Ó¦Öú: 0 (Ó×¶ùÔ°)
- ¹ó±ö: 3.109
- ½ð±Ò: 6404.6
- ºì»¨: 10
- Ìû×Ó: 3094
- ÔÚÏß: 5.9Сʱ
- ³æºÅ: 76692
- ×¢²á: 2005-06-25
- ÐÔ±ð: GG
- רҵ: ´ß»¯
- ¹ÜϽ: ´ß»¯

2Â¥2006-09-01 12:23:41
1
![]() ![]() ![]() |
3Â¥2006-09-01 13:11:15
wszynh
½ð³æ (СÓÐÃûÆø)
- Ó¦Öú: 0 (Ó×¶ùÔ°)
- ½ð±Ò: 1670.5
- Ìû×Ó: 265
- ÔÚÏß: 4.1Сʱ
- ³æºÅ: 271472
- ×¢²á: 2006-08-12
- ÐÔ±ð: GG
- רҵ: ´ß»¯»¯Ñ§
4Â¥2006-09-01 15:16:47
1
![]() ![]() |
5Â¥2006-09-01 22:20:40
1
|
6Â¥2006-09-02 01:07:22
1
![]() ![]() ![]() |
7Â¥2006-09-02 08:00:57
1
![]() ![]() ![]() |
8Â¥2006-09-02 08:05:48
zmzhou
ÖÁ×ðľ³æ (Ö°Òµ×÷¼Ò)
- Ó¦Öú: 0 (Ó×¶ùÔ°)
- ½ð±Ò: 32230.5
- ºì»¨: 1
- Ìû×Ó: 4663
- ÔÚÏß: 593Сʱ
- ³æºÅ: 98677
- ×¢²á: 2005-11-10
- רҵ: »¯Ñ§·´Ó¦¹¤³Ì
9Â¥2006-09-03 18:26:42
mesoporous
½ð³æ (СÓÐÃûÆø)
- Ó¦Öú: 0 (Ó×¶ùÔ°)
- ½ð±Ò: 694.1
- ºì»¨: 2
- Ìû×Ó: 224
- ÔÚÏß: 370.7Сʱ
- ³æºÅ: 277036
- ×¢²á: 2006-09-03
- ÐÔ±ð: MM
- רҵ: Chem
10Â¥2006-09-05 15:31:46













»Ø¸´´ËÂ¥

