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Ni-Mo catalysts were introduced by incipient wetness impregnation of the synthesized MCM-41 sieve. Aqueous solutions of Ni(CH3COO)2¡¤ 4H2O and (NH4)6Mo7O24¡¤ 4H2Owere used for the catalysts Ni-Mo/MCM-41. The MCM-41 was impregnated first with the required amount of aqueous solution of (NH4)6Mo7O24¡¤ 4H2O and dried at 1200C for 14 h£»the dried material was calcined at 4500 for 6 h and at 5000C for 2 h in air. Then, the Mo/MCM-41 was impregnated with the required amount of Ni(CH3COO)2 ¡¤ 4H2O, also dried at 1200 and calcined at 4500 for 6 h and at 500 0C for 2 h in air. In the case of Mo/MCM-41, MoO3 content was of 12 wt.% and, in the case of Ni-Mo/MCM-41 catalyst, the promoted NiO content was varied at 3, 6 and 9 wt.%,respectively. These catalysts are further referred to as Ni-Mo-0.25/MCM-41, Ni-Mo-0.50/MCM-41 and Ni-Mo-0.75/ MCM-41, respectively, where 0.25, 0.50 and 0.75 are the Ni/Mo atomic ratio. ÎÄÏ× µÚÒ»Ò³ÓÒÏ·½µÚÒ»¶Î¡£ On the other hand, for the hydrogenation, the catalyst bed of approximately 30 mm length was packed between two quartz wool layers in the center of the reactor. µÚ¶þÒ³×ó±ßÉÏÊý14ÐС£ Èç¹ûÕâ´«µÄ¸ñʽÓдíÎ󣬴óÉñÃÇ¿ÉÒÔÏÂÔØÎÄÏײ鿴¡£ |
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Ni-Mo catalysts were introduced by incipient wetness impregnation of the synthesized MCM-41 sieve. Aqueous solutions of Ni(CH3COO)2¡¤ 4H2O and (NH4)6Mo7O24¡¤ 4H2Owere used for the catalysts Ni-Mo/MCM-41. The MCM-41 was impregnated first with the required amount of aqueous solution of (NH4)6Mo7O24¡¤ 4H2O and dried at 1200C for 14 h£»the dried material was calcined at 4500 for 6 h and at 5000C for 2 h in air. Then, the Mo/MCM-41 was impregnated with the required amount of Ni(CH3COO)2 ¡¤ 4H2O, also dried at 1200 and calcined at 4500 for 6 h and at 500 0C for 2 h in air. In the case of Mo/MCM-41, MoO3 content was of 12 wt.% and, in the case of Ni-Mo/MCM-41 catalyst, the promoted NiO content was varied at 3, 6 and 9 wt.%,respectively. These catalysts are further referred to as Ni-Mo-0.25/MCM-41, Ni-Mo-0.50/MCM-41 and Ni-Mo-0.75/ MCM-41, respectively, where 0.25, 0.50 and 0.75 are the Ni/Mo atomic ratio. ͨ¹ýºÏ³ÉMCM-41·Ö×ÓɸµÄµÈÌå»ý½þ×Õ·¨À´ÒýÈëNi-Mo´ß»¯¼Á¡£½«Ni(CH3COO)2¡¤ 4H2OºÍ(NH4)6Mo7O24¡¤ 4H2OµÄË®ÈÜÒºÓÃÓÚ´ß»¯¼Á Ni-Mo/MCM-41¡£Ê×ÏÈ£¬ÓÃËùÐèÁ¿µÄ (NH4)6Mo7O24¡¤ 4H2O µÄË®ÈÜÒº½þ×ÕMCM-41£¬²¢ÔÚ120¡æÏ¸ÉÔï14h£»½«¸ÉÔïµÄ²ÄÁÏÔÚ¿ÕÆøÖÐÓÚ450¡æÏÂìÑÉÕ6h£¬²¢ÔÚ500¡æÏÂìÑÉÕ2h¡£È»ºó£¬ÓÃËùÐèÁ¿µÄNi(CH3COO)2 ¡¤ 4H2O½þ×ÕMo/MCM-41£¬Ò²ÔÚ120¡æÏ¸ÉÔ²¢ÔÚ¿ÕÆøÖÐÓÚ450¡æÏÂìÑÉÕ6h£¬²¢ÔÚ500¡æÏÂìÑÉÕ2h¡£ÔÚMo/MCM-41µÄÇé¿öÏ£¬MoO3º¬Á¿ÊÇ 12 wt.%¡£ÔÚNi-Mo/MCM-41´ß»¯¼ÁµÄÇé¿öÏ£¬´Ù½øµÄNiO º¬Á¿·Ö±ðÔÚ 3, 6 ºÍ9 wt.%ϱ仯¡£ÕâЩ´ß»¯¼Á»¹·Ö±ð³Æ×÷ Ni-Mo-0.25/MCM-41, Ni-Mo-0.50/MCM-41 ºÍNi-Mo-0.75/ MCM-41, ÆäÖÐ0.25, 0.50 ºÍ 0.75 ÊÇ Ni/Mo Ô×Ó±ÈÀý¡£ ÎÄÏ× µÚÒ»Ò³ÓÒÏ·½µÚÒ»¶Î¡£ On the other hand, for the hydrogenation, the catalyst bed of approximately 30 mm length was packed between two quartz wool layers in the center of the reactor. ÁíÒ»·½Ã棬¶ÔÓÚÇ⻯¶øÑÔ£¬ÔÚ·´Ó¦Æ÷µÄÖÐÑ룬½«Ô¼30mm³¤µÄ´ß»¯¼Á´²Ìî³äÔÚÁ½¸öʯӢÃÞ²ãÖ®¼ä¡£ |
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