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Cavalier2008鐵桿木蟲(chóng) (正式寫手)
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[交流]
【求助】浸漬法負(fù)載不上去怎么辦 已有4人參與
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| 我是采用等體積浸漬法制備催化劑,采用硼氫化鈉還原,結(jié)果發(fā)現(xiàn)活性組分沒(méi)負(fù)載上去,自己估計(jì)是在洗滌步驟出現(xiàn)問(wèn)題,請(qǐng)問(wèn)大家都是如何去除還原后催化劑中的雜質(zhì)呢?還有,我經(jīng)常看到制備后要陳化,請(qǐng)問(wèn)陳化對(duì)催化劑制備有什么好處呢? |


至尊木蟲(chóng) (職業(yè)作家)

木蟲(chóng) (著名寫手)

金蟲(chóng) (小有名氣)
鐵桿木蟲(chóng) (正式寫手)

鐵桿木蟲(chóng) (正式寫手)

金蟲(chóng) (小有名氣)
小木蟲(chóng)
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first , the way you test the loading is not right. The best one is using element analysis or EXD to see whether the metal or elements you want is loaded on the support. because for activity, so many factors effect it, such as particle size (if your reaction is structure sensitive ), coordiation, the chemical state, and so on. the other way to test may be to reduce you sample under H2 for while. if it works, then it means the NaBH4 is not the right reductant. you can't choose it. the third way is to use some special indicator to find the amount of the elements in the filter by tritation. if the amount in the filter solutin is higher, even similar to the calculation amount, then you are sure to your conclustion. |

至尊木蟲(chóng) (職業(yè)作家)

鐵桿木蟲(chóng) (著名寫手)

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