| 查看: 5087 | 回复: 6 | |||
| 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 | |||
[交流]
TPR和TPD分别是表征什么的
|
|||
|
谁能告诉我一下TPR和TPD分别是表征什么的，现在只知道指的是程序升温还原和程序升温脱附，哪位能细致地解释一下啊，感激不尽！ 顺便问一下，具体的表征装置是什么样的。[/size] [ Last edited by yutian.35 on 2008-4-24 at 08:11 ] |
回复此楼» 猜你喜欢
分子筛催化方向 一篇cej共一第一 可以申请上海什么学校呢
已经有4人回复
-
求助共晶分子筛的电镜图分析，有偿
已经有1人回复
-
专业论文润色/翻译怎么收费?
已经有220人回复
-
中南大学化学化工学院招收电池储能、理论计算方向博士生
已经有16人回复
-
风电环氧领域
已经有3人回复
-
请问哪里可以代烧带压力的炉子？
已经有6人回复
-
关于合成MIL-125的求助
已经有0人回复
-
双非本硕光催化方向想读博，请各位老师看看我！
已经有2人回复
-
瑞典林雪平大学范立洲课题组现招聘博士后、岗位制博士生
已经有0人回复
-
中国科大仿生界面材料科学全国重点实验室戴懿涛研究员/江雷院士团队招聘科研助理
已经有0人回复
-
中国科大仿生界面材料科学全国重点实验室戴懿涛研究员/江雷院士团队招聘科研助理
已经有0人回复
ElectroWang
铜虫 (小有名气)
- 应助: 0 (幼儿园)
- 金币: 610.4
- 散金: 6
- 红花: 1
- 帖子: 156
- 在线: 64.1小时
- 虫号: 307253
- 注册: 2006-12-16
- 专业: 常微分方程与动力系统
★ ★
nxl5096224(金币+2,VIP+0):多谢关注！
nxl5096224(金币+2,VIP+0):多谢关注！
|
Thermal desorption spectroscopy Thermal desorption spectroscopy (TDS), also known as temperature programmed desorption (TPD) is the method of observing desorbed molecules from a surface when the surface temperature is increased. Many researchers prefer the name TPD because it is not a spectroscopic method. When molecules comes in contact with a surface, they adsorb onto it, minimizing their energy by forming a chemical bond with the surface. The binding energy varies with the combination of the adsorbate and surface. If the surface is heated, at one point, the energy transferred to the adsorbed species will cause it to desorb. The temperature at which this happens is known as the desorption temperature. Thus TDS shows information on the binding energy. Since TDS observes the mass of desorped molecules, it shows what molecules are adsorbed on the surface. Moreover, TDS recognizes the different adsorption conditions of the same molecule from the differences between the desorption temperatures of molecules desorping different sites at the surface, e.g. terrasses vs steps. TDS also obtains the amounts of adsorbed molecules on the surface from the intensity of the peaks of the TDS spectrum, and the total amount of adsorped species is shown by the integral of the spectrum. To measure TDS, one needs a mass spectrometer, such as a quadrupole mass spectrometer or a time-of-flight (TOF) mass spectrometer, under ultrahigh vacuum (UHV) conditions. The amount of adsorbed molecules is counted by increasing the temperature at a heating rate of typically 2K/s-10 K/s. Several masses are simultaneously counted by the mass spectrometer, and the intensity of each mass as a function of temperature is obtained as a TDS spectrum. The heating procedure is often controlled by a computer or a Eurotherm using a PID algorithm. Quantitative Intrepetation of TDS data This is usually done using the "Redhead" method[1], assuming the exponential prefactor and the desorption energy to be independent of the surface coverage. ^ Redhead, P. A. "Thermal desorption of gases" Vacuum 12 (1962) p.203-211 |
7楼2008-04-10 17:48:36
yhjiangshiyu
木虫 (正式写手)
- 应助: 0 (幼儿园)
- 金币: 15680.8
- 帖子: 840
- 在线: 32.5小时
- 虫号: 307492
- 注册: 2006-12-16
- 性别: GG
- 专业: 理论和计算化学
2楼2008-04-08 15:49:13
3楼2008-04-08 16:31:52
liu5288kangkai
木虫 (著名写手)
逍遥忍者
- 应助: 0 (幼儿园)
- 贵宾: 0.15
- 金币: 1835.8
- 红花: 3
- 帖子: 1521
- 在线: 72.2小时
- 虫号: 276474
- 注册: 2006-09-02
- 性别: GG
- 专业: 资源化工
4楼2008-04-09 10:53:04
