24小时热门版块排行榜

返回列表

当前主题已经存档。

当前只显示满足指定条件的回帖，点击这里查看本话题的所有回帖

piaoxuepp

木虫 (小有名气)

应助: 0 (幼儿园)
金币: 1944.9
帖子: 82
在线: 2.9小时
虫号: 87991
注册: 2005-08-22
性别: MM

[交流] 如何评价催化剂的酸碱性

在一个碱性催化剂体系中,如何评价催化剂的酸性碱性以及酸碱双官能性,用什么手段表征?

回复此楼

» 猜你喜欢

中国水产科学研究院黄海水产研究所博士后科研工作站2026年博士后招收公告已经有0人回复
大连海事大学国家级人才团队2026年博士研究生招生启事（氢能）已经有10人回复
物理化学论文润色/翻译怎么收费? 已经有110人回复
国家级人才课题组招收2026年入学博士已经有6人回复
意大利米兰理工大学急聘CSC公派留学博士生（物理或无机材料科学方向）已经有47人回复
求加氢处理工艺与工程（第二版）pdf 李大东中国石化出版社 9787511436689 已经有0人回复
新加坡ASTAR招收CSC或学校资助联培博士生/访问学生已经有2人回复
求助Amsterdam Density Functional 已经有3人回复
Postdoctoral Research Fellow Position in Causal Inference Weill CorneIl Medicine 已经有8人回复
武汉纺织大学全国重点实验室陈嵘教授团队招收2026级学术/专业型硕士研究生已经有0人回复

1楼 2007-06-20 10:16:00

已阅回复此楼关注TA 给TA发消息送TA红花 TA的回帖

daiqiguang

荣誉版主 (知名作家)

C-EPI: 1
应助: 4 (幼儿园)
贵宾: 3.1
金币: 1496.6
散金: 104
红花: 29
帖子: 5485
在线: 565.7小时
虫号: 186979
注册: 2006-02-16
性别: GG
专业: 工业催化/材料、环境催化
管辖: 催化

★ ★ ★ ★
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