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The hydrolysis of the alkoxide solution was carried out at 5C, adding drop- wise a solution of H2O (H2O/Zr(OBu)4 = 4molar ratio), Ni(NO3)2 6H2O, Ce(NO3)6H2O, HNO3(HNO3/Zr(OBu)4=0:2molar ratio) and 100ml of isopropyl alcohol. The green rigid transparent gels obtained were aged “in situ” for 24 h and then dried in air flow at room temperature. The dry gels were carefully calcined in air at 500C during 2 h with a 100Nml/min flow. In addition a Ni/CeO2 catalyst was prepared by coprecipitation of a solution of Ni and Ce nitrates in isopropyl alcohol at constant pH D 9. The calcined solids were crushed and sieved and the frac- tion with particle size between 0.16 and 0.40mm was kept. |
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monitor2885
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小童2133(金币+6,VIP+0): 6-3 17:49
小童2133(金币+6,VIP+0): 6-3 17:49
| 在5摄氏度下，逐滴加入由H2O（H2O/Zr(OBu)4的摩尔比 = 4），Ni(NO3)2 6H2O，Ce(NO3)6H2O和 HNO3(HNO3/Zr(OBu)4的摩尔比=0:2)构成的混合液，以及100毫升的异丙醇溶液，从而使醇盐溶液发生水解反应。不易形变的绿色透明溶胶通过24小时的原位老化，并在室温通风干燥而获得。干燥后的溶胶要在100Nml/min的载气流通下，经过2小时500摄氏度的煅烧。另外，Ni，Ce在pHD9的异丙醇溶液中协同沉淀后得到Ni/CeO2催化剂。煅烧后的固体经过压碎筛选之后，保留粒径在0.16至0.4毫米的固体颗粒。 |
2楼2009-06-03 16:35:08
