24小时热门版块排行榜    

Znn3bq.jpeg
查看: 3681  |  回复: 9
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

dreamlyz

金虫 (初入文坛)

[求助] 【紧急求助】关于TOF的计算

各位高手,小弟最近在分析反应数据计算TOF时有些迷惑,查了不同的文献,
计算方法有些差异,不知道是我的理解错误还是什么问题,真诚求教各位!

1、有的TOF为:单位时间单位质量的金属催化剂转换的分子数除以金属表面原子数
The TOF was calculated from TOF=rAc/nOF. Therewith, rAc is the total amount of acrolein converted per weight of gold per second, and nOF the amount of gold at the surface. The latter is calculated from nOF=ntotal*D, where ntotal is the total amount of gold and D the degree of dispersion (i.e., the surface-to-volume ratio), estimated by TEM.
http://www.sciencedirect.com/sci ... i/S002195170200043X

TOF was calculated from TOF=rAC/n*D: γ is the total moles of CO converted per gram of Pd per second; n is the total moles of Pd at the surface; D is the cluster dispersion assuming sphere clusters. D was obtained from Ref. [18] based on calculated total number of atoms in each cluster. The size of clusters was measured from TEM and we assumed spherical shape to calculate total number atoms in each cluster from diameter of the spheres.
http://www.springerlink.com/content/p6gn02v77814m268/

2、有的计算为:单位时间内转化的反应物分子数除以金属表面原子数
The turnover frequency (TOF), number of molecules of CO converted per surface atom of gold particles and per second, was calculated for the two series of catalysts with the assumption that gold particles were cubo-octahedra. This hypothesis is supported by HRTEM observation (see next section). The dispersion D was calculated by the formula D=Ns/Nt, where Ns represents the number of surface atoms and Nt the total number atoms in the particle.
http://www.sciencedirect.com/sci ... i/S0021951703004482

应该以哪种方法为准呢?
比较着急,希望大家多多指教啊~~


[ Last edited by dreamlyz on 2011-6-28 at 16:10 ]
回复此楼
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

国医道福

银虫 (小有名气)

5楼2011-06-28 19:27:49
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
查看全部 10 个回答

sjzsh2009

铁杆木虫 (著名写手)


zxrno10(金币+1): 2011-06-28 17:35:25
应该是上面的为准吧,都是单位量的才有意义
2楼2011-06-28 17:11:55
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

国医道福

银虫 (小有名气)

【答案】应助回帖

第一遍没看懂 再看下 两个是一样的说法么?还是两种不同的方法
祝我心爱的亲人们健康快乐!我爱您们
3楼2011-06-28 19:10:42
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

dreamlyz

金虫 (初入文坛)

引用回帖:
Originally posted by 国医道福 at 2011-06-28 19:10:42:
第一遍没看懂 再看下 两个是一样的说法么?还是两种不同的方法

问题关键在于是否为单位质量催化剂。
6楼2011-06-28 19:28:28
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖
最具人气热帖推荐 [查看全部] 作者 回/看 最后发表
[考研] 一志愿211,化学学硕,310分,本科重点双非,求调剂 +19 努力奋斗112 2026-04-04 20/1000 2026-04-10 12:15 by pengliang8036
[考研] 材料专硕(0856) 339分求调剂 +11 哈哈哈鹅哈哈哈 2026-04-04 11/550 2026-04-10 09:37 by 690616278
[考研] 22408调剂求助 +3 毂12 2026-04-09 5/250 2026-04-09 23:21 by zhouyuwinner
[考研] 284求调剂 +7 archer.. 2026-04-09 8/400 2026-04-09 21:30 by bljnqdcc
[考研] 278求调剂 +27 范婷娜 2026-04-07 31/1550 2026-04-09 20:49 by zhouxiaoyu
[考研] 274求调剂 +5 山阿蔓 2026-04-07 5/250 2026-04-09 15:28 by 18828373951
[考研] 308求调剂 +17 墨墨漠 2026-04-06 17/850 2026-04-09 09:25 by 壹往無前
[考研] 专硕0854初试考材科基,求调剂 +7 3220548044 2026-04-06 10/500 2026-04-08 21:59 by hypershenger
[考研] 336求调剂,一志愿中科大 +9 墨彧 yuyu 2026-04-06 9/450 2026-04-08 11:24 by 想读书的菌菌
[考研] 326分,一志愿沪9,求生物学调剂 +4 刘墨墨 2026-04-05 4/200 2026-04-08 06:22 by lijunpoly
[考研] 286求调剂 +20 Faune 2026-04-06 20/1000 2026-04-07 11:33 by 诗与自由
[考研] 346分的生物与医药08600求调剂 +6 常雨阳上岸 2026-04-05 7/350 2026-04-06 12:36 by lys0704
[考研] 0857大类环境工程B区求调剂 +3 龚禹铭 2026-04-05 3/150 2026-04-06 10:22 by 蓝云思雨
[考研] 296求调剂 +3 汪!?! 2026-04-05 4/200 2026-04-05 20:13 by 啵啵啵0119
[考研] 考研生物学考A区211,初试322,科目生化和生物综合,求调剂 +6 。。。54 2026-04-03 6/300 2026-04-05 14:54 by JOKER0401
[考研] 一志愿上海海洋大学083200食品学硕,求调剂,接受其他专业083200 +4 what张 2026-04-04 5/250 2026-04-05 14:07 by chw1980_0
[考研] 328分调剂 +6 门men 2026-04-04 6/300 2026-04-05 13:40 by imissbao
[考研] 0854求调剂 +4 assdll 2026-04-04 4/200 2026-04-05 09:44 by zhq0425
[考研] 325求调剂 +4 春风不借意 2026-04-04 4/200 2026-04-04 14:46 by 湘农储能材料
[考研] 278求调剂 +6 Yy7400 2026-04-03 6/300 2026-04-04 09:53 by zhangdingwa
信息提示
请填处理意见