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langchentf

木虫 (正式写手)

[交流] 如何测定负载金属在载体上的分散度

Pd/氧化铝,怎么测定分散度,有没有这方面的文献,请推荐。

[ Last edited by linweiguo0 on 2007-6-6 at 09:14 ]
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lmgecnu

至尊木虫 (职业作家)

可以做氢氧滴定,其它方法好象不好用
6楼2006-12-05 17:50:21
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langchentf

木虫 (正式写手)

负载量小于1%,XRD不可能测到
3楼2006-12-05 17:07:34
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chunjli

金虫 (正式写手)

★
rabbit7708(金币+1):呵,谢谢应助!:)
最直接的方法是TEM,或者CO或氢气的化学吸附也可以啊。
曾经的过去云淡风轻
7楼2006-12-05 18:58:12
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hasee

银虫 (小有名气)

用化学氢气吸附!请楼主看看下面这段英文吧!
Pt or Pd metal dispersion on beta was determined by equilibrium hydrogen chemisorption at room temperature in AUTOSORB-6B(Quantachrome). Prior to H2 adsorption analysis, the samples were evacuated at 473K for 1 h, exposed to static H2 at 573K for 2 h , and placed under dynamic vacuum at 573K for 3 h.
或参考文献:P. Papaefthimiou, T. Ioannidex, X. E. Verykios, Appl. Catal. B, 13(1997)175
9楼2006-12-05 21:24:04
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