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北京石油化工学院2026年研究生招生接收调剂公告
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daiqiguang

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linweiguo0(金币+4):谢谢应助 辛苦了
酸性前面有专帖介绍

碱性可以看看http://www.muchong.com/bbs/viewthread.php?tid=472557&fpage=2——碱土金属氧化物、氢氧化物作为碱催化反应催化剂的优化(reveiw)   

broad terms, the main techniques that are used frequently are the following: titration, spectroscopic investigations, and test reactions. These methods, in conjunction with adsorption and temperature-programed desorption (TPD) of probe molecules, give information about the nature, number, strength, and reactivity of basic sites on solid catalysts.

A. TITRATION METHODS
The number of basic sites of different strengths can be evaluated by titration
using organic acids (benzoic acid, acrylic acid, phenol, etc.) in water or organic
solvents

The strength of the basic sites can be expressed on a scale given by the H
function defined by the equation
B. SPECTROSCOPIC METHODS
Techniques such as X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR) spectroscopy, have been applied to determine the basic properties of solids (2). The usefulness of XPS is based on the fact that the electronpair donating ability of a solid base may be directly related to the O1s binding energy. A good correlation between effective oxygen charge and the O1s binding energy was found for single metal oxides (44). EPR, combined with the adsorptionof probe molecules such as tetracyanoethylene and perylene。

       Among the spectroscopic techniques, one of the most widely used to characterize the basic properties of alkaline earth metal oxides is infrared (IR) spectroscopy of adsorbed probe molecules


Temperature-programed desorption of the probe molecules is frequently used to
measure the number and strength of basic sites, and the most commonly used probe molecule is CO2. According to this method, the strength of the basic sites is represented by the desorption temperature, and the peak area in the TPD plot determines the number of basic sites
有事请到www.chemj.cn上找chemj,谢谢
11楼2007-06-22 13:34:38
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bluecard

银虫 (小有名气)

幸好我来读博啊,不然怎么能一下子看懂楼上发的这么专业,这么大堆的英文资料呢!看来方法还真多啊!请教一下,那个"basic sites"如何译成专业中文?
如果我不能骄傲的存在,请不要阻止我离开!
12楼2007-06-22 18:58:19
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piaoxuepp

木虫 (小有名气)

是不是可以翻译为“碱性位”呢?
13楼2007-06-26 00:08:14
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piaoxuepp

木虫 (小有名气)

谢谢大家的指点!有机会多讨论,一个人总是更无知哈
14楼2007-06-26 00:10:16
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sgza

木虫 (小有名气)

看教科书就可以了。这里的帖子很多是针对一些实验中的具体问题。而你问的是基本知识,很多很多很多教科书上都有的,既全面又详细。
15楼2007-06-29 07:21:25
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