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3Â¥2012-12-03 15:37:39
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4Â¥2012-12-03 15:54:41
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5Â¥2012-12-03 19:55:58
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ÎÒÃÇ×ö¹ý°ÑÑõ»¯ïç½þ×Õµ½¶þÑõ»¯¹èÉÏ£¬¾ßÌåµÄ²½ÖèÊÇ£º A series of La2O3-modified SiO2 denoted as xLa2O3-SiO2 (x = 5, 10, 15, 30), where x means the amount of La2O3 (wt%) added in SiO2, were prepared by impregnation of a commercial spherical SiO2 into an aqueous solution of lanthanum nitrate. The precursor supports were dried at 110 ¡ãC overnight, and calcined at 700 ¡ãC for 4 h. ²Î¿¼ÎÄÏ×£ºCatalysis Today, Volume 131, Issues 1¨C4, 29 February 2008, Pages 278-284 Ò²×ö¹ý°Ñ΢Á¿µÄïçͨ¹ýÀë×Ó½»»»·¨¸ºÔص½YÐÍ·Ö×ÓɸÉÏ£¬¾ßÌå²½Ö裺 A powder zeolite NH4Y (Si/Al = 6, BET surface area 420 m2/g) was firstly ion-exchanged in each of an acidic aqueous solution of La3+, Ce3+, Pr2+, Nd3+, Sm3+ and Eu3+ at 90 ¡ãC under reflux for 4 h, then the solid was filtered, washed, dried and finally calcined at 500 ¡ãC for 5 h. This process was repeated 3¨C5 times in order to obtain an equal amount of rare earth metal in the modified zeolite. ²Î¿¼ÎÄÏ×£ºFuel, Volume 86, Issues 17¨C18, December 2007, Pages 2707-2713 |
6Â¥2012-12-03 20:24:39
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7Â¥2012-12-04 09:18:06
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8Â¥2012-12-04 11:09:35
wshails
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9Â¥2012-12-04 14:15:50
wshails
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10Â¥2012-12-04 14:16:19














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