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ccshiyu

银虫 (小有名气)

[交流] 【求助】求助关于金属氧化物表面羟基的形成原因,达人速进 已有6人参与

请问各位虫友
金属氧化物表面的羟基是金属氢氧化物高温焙烧脱水形成的?还是金属氧化物吸附空气中的水分子形成的?还是两者都有?

如果是吸附水分子形成的,那么这种羟基会稳定的存在于金属氧化物表面么?

B酸的形成是因为L酸吸附水而形成的么?
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jinkai838

木虫 (著名写手)

Israel Wachs

iew.jpg
G. Whitney Snyder Professor and Professor of Chemical Engineering
Director, Operando Molecular Spectroscopy and Catalysis Research Lab

Ph.D. Stanford University, 1977
M.S. Stanford University, 1974
B.E. City College of New York, 1973

Our research focuses on surface oxides and has demonstrated that, for many two-component metal oxide systems, one metal oxide may be present as an atomically dispersed phase over a second metal oxide substrate. The state of the atomically dispersed metal oxide, the surface oxide, has a different structure from that of its bulk unsupported oxide counterpart. This structural difference usually results in very different chemical properties. Our studies have shown that a relationship exists between the metal oxide structure and its surface reactivity (reduction properties and catalytic activity or selectivity).

The complex structures of the atomically dispersed surface oxides are poorly understood. The focus of our program is therefore to examine systematically the various structures of these atomically dispersed surface oxides on oxide substrates and to determine the factors that control the metal oxide structure. Much of the structural information about surface oxides can be provided with modern laser Raman spectroscopy because of the dependence of the Raman spectrum on the structure of the scattering material.

Another of our goals is to define the relationship between surface oxide structures and their various physical and chemical properties. A better understanding of the synthesis and materials science/solid-state chemistry of the surface oxides is also emerging from this research program. The insight generated from this research has implications for metal oxide catalysts, ceramic materials, pigment materials, and electronic devices which find wide application in the pollution control industry, chemical industry, petroleum industry and the advanced materials industries
斜杠青年
10楼2010-10-19 14:49:45
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americanyk

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Excellent

优秀版主

★ ★
ccshiyu(金币+3):感谢版主的详细回复 2010-06-02 22:37:36
liconglin970410(金币+1):多谢指点,欢迎常来交流 2010-06-08 13:50:33
tangjy(金币+1):谢谢回帖交流 2010-10-19 14:13:32
[quote]Originally posted by ccshiyu at 2010-06-02 08:26:06:

1.金属氧化物表面的羟基是金属氢氧化物高温焙烧脱水形成的?还是金属氧化物吸附空气中的水分子形成的?还是两者都有?
Answer: 金属氧化物表面的羟基是金属氢氧化物焙烧脱水形成的--Main
金属氧化物吸附空气中的水分子形成的--Little

2.如果是吸附水分子形成的,那么这种羟基会稳定的存在于金属氧化物表面么?

Depend on the conditions. The bond is noramlly weak.
4楼2010-06-02 18:40:27
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aust_jhe

至尊木虫 (著名写手)

ccshiyu(金币+2):谢谢anut_jhe的建议 2010-06-02 22:38:16
看看I. E. Wachs的文章,到Pubs.acs.org上检索一下,有不少的,尤其是上世纪九十年代的文章。看后你的问题完全可以解决。
天天学习,好好向上
5楼2010-06-02 18:47:43
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江伟

木虫 (正式写手)

好像是吸附的比例比较大吧!经过焙烧之后表面应该就没有羟基了
6楼2010-06-02 23:03:49
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