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【求助】wet impregnation 和 impregnation 的区别?
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| 看到一篇文献,讲到制备时用到“wet impregnation",不知道这个和单独的impregnation有什么区别,有哪位大师能够指点一下啊? |
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2楼2009-07-10 13:06:31
愚公8538
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3楼2009-07-10 14:28:50
jinkai838
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4楼2009-07-10 17:18:07
5楼2009-07-10 23:05:34
xiaolong3097
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6楼2009-07-10 23:09:13
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7楼2009-07-11 12:14:34
annbm003898
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8楼2009-08-21 09:53:36
Simon1980
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9楼2009-08-21 13:28:47
黄河第一桥
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大家借鉴一下Catalyst Preparation, Science and Engineering
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小木虫(金币+0.5):给个红包,谢谢回帖交流
小木虫(金币+0.5):给个红包,谢谢回帖交流
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Type of impregnation Distinguishing characteristics:Dry impregnation (DI)(known as pore filling and incipient wetness) Use sufficient metal solution to fill pore volume of catalyst support; adjust metal concentration for desired weight loading Advantages: Simplest to employ; no filtering; metal content is fixed Disadvantages: Strong precursor-support interaction is not guaranteed Wet impregnation (WI) Amount of solution in excess of pore volume of support; precursors that interact weakly with support are evaporated or washed/filtered away A: Mixing is improved D: Filtering required; metal loading must be measured; metal wasted if it does not strongly interact with support Strong electrostatic adsorption (SEA)(ion adsorption) Excess solution; pH held at optimal value for strong precursor interaction with support A: Strong; monolayer adsorption of metal precursor D: Optimal pH must be determined and achieved during preparation Deposition-precipitation (DP) Excess solution; pH slowly and homogeneously increased to precipitate precursor at support surface A: High metal loadings are most easily achieved D: pH must be altered during preparation Ion exchange (IE) Exchange of cationic metal precursors with counterions in zeolite framework A: Strong interaction of precursor with zeolite is assured D: Limited to cationic precursors Reactive adsorption Driving force exists for reaction of precursor with support A: Strong interaction of precursor with support is assured D: Limited in applicability to certain systems |
10楼2009-08-21 15:31:40














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,蒙的。其实效果差不多。。
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