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junfeng80

金虫 (小有名气)

[求助] 关于硅溶胶的问题请教一下

请教一下,我现在采用共沉淀法制备CuO/SiO2催化剂,采用硅溶胶作为硅源,在共沉淀完成老化后进行抽滤,是不是硅溶胶在水溶液中被抽滤掉呢?是蒸水还是直接抽滤得到固体?

[ Last edited by junfeng80 on 2012-3-29 at 20:00 ]
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mland

木虫 (著名写手)

【答案】应助回帖

★ ★ ★ ★ ★
感谢参与,应助指数 +1
junfeng80: 金币+5, ★有帮助, 谢谢 2012-03-31 14:36:18
硅溶胶沉淀后变成二氧化硅凝胶了,溶液中含量很低了
Cu/SiO2 catalysts prepared by the ammonia-evaporation method:
Texture, structure, and catalytic performance in hydrogenation of dimethyl
oxalate to ethylene glycol
Liang-Feng Chen a, Ping-Jun Guo a, Ming-Hua Qiao a,∗, Shi-Run Yan a, He-Xing Li b, Wei Shen a, Hua-Long Xua,∗,
Kang-Nian Fan
Journal of Catalysis 257 (2008) 172–180
参考下,虽然制备有所不同,但是这是制备Cu/SiO2相当好的方法,已验证
3楼2012-03-30 15:42:03
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xhtangxh

木虫 (著名写手)

有木有虫

【答案】应助回帖

感谢参与,应助指数 +1
如何共沉淀的?硅溶胶沉淀必须先转化为硅凝胶吧?那就不会溶于水中了,直接抽滤、干燥后就得到固体,而硅溶胶是溶于水溶液中可被抽滤掉的。
2楼2012-03-30 09:00:31
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