24小时热门版块排行榜    

Znn3bq.jpeg
汕头大学海洋科学接受调剂
查看: 1382  |  回复: 10
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

liuchuanao

铜虫 (小有名气)

[求助] 核壳催化剂制备过程原理

求大神指导,小弟刚接触此方面还不是很了解,最近看文献,有如下一段:(!)((1)Preparation of Nickel Cores.
         A mixture of Ni(acac) 2 (0.77g, 3.0 mmol) and TOP (4.0 mL, 9.0 mmol) in oleylamine (20mL) was slowly heated from room temperature to 493 K for 15 min under an inert atmosphere and was allowed to stir at 493 K for 45 min. After the reaction, the resulting black mixture was cooled at room temperature, and the particles were precipitated by adding ethanol (40 mL) and centrifuging at 10000 rpm for 20 min. Finally, the nickel nanoparticles were dispersed in cyclohexane.
其中加粗部分加入乙醇是起什么作用呀?
(2)Synthesis of Ni(3 nm)@SiO2 Yolk-Shell Nanocatalysts.
Cyclohexane (25 mL) was added into a mixture of igepal CO-630 (8.0 mL) and NH4OH aqueous solution (1.0 mL) and stirred for 10 min. The nickel particle dispersion in cyclohexane (25 mL, 60 mM with respect to the nickel precursor concentration) was added into the mixture and allowed to stir rapidly for 30 s. TMOS (1.0 mL) and C18TMS (1.0 mL) were added, and the mixture was stirred for 1 h at room temperature. The resulting Ni@SiO2 core -shell particles were precipitated by adding methanThe ethanol dispersion (30 mL) of the Ni@SiO2 core -shell particles (50 mM with respect to the nickel precursor concentration) was treated with hydrochloric acidol (10 mL), washed with ethanol thoroughly, and redispersed in ethanol. The ethanol dispersion (30 mL) of the Ni@SiO2 core -shell particles (50 mM with respect to the nickel precursor concentration) was treated with hydrochloric acid (10 mL, 0.45 M) at room temperature for 30 min. The product was collected by centrifugation at 10 000 rpm for 30 min and washed with ethanol thoroughly. After drying at room temperature, the powders were placed in the ceramic boat in a glass tube oven, heated at a ramping rate of 4 K/min to 773K, and calcined at 773 K for 2 h under a hydrogen flow of 200 cc/min. After calcination, the resulting powders were cooled to room tem-perature and immediately submerged into anhydrous ethanol (20 mL) under a hydrogen environment in order to prevent surface oxidation of the nickel cores.
其中加入盐酸的的作用是什么呀?
求大神帮忙呀,小弟万分感激!!!
回复此楼

» 猜你喜欢

» 本主题相关价值贴推荐,对您同样有帮助:

已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

冰王子1

银虫 (小有名气)


感谢参与,应助指数 +1
jiangyun2: 金币-1, 应助指数-1, 这种回答就不要点应助了,警告一下~~ 2013-09-08 19:46:58
哥也不知道。。得点金币哈哈
3楼2013-09-08 18:37:59
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 11 个回答

liuchuanao

铜虫 (小有名气)

求助呀,小弟万分感谢!!!
2楼2013-09-06 08:09:38
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

leedoubles

铜虫 (初入文坛)


missu001: 金币+1, 感谢交流 2013-09-09 10:16:50
醇可能是溶剂, 酸可能是用来调节PH值
4楼2013-09-09 10:14:27
已阅   回复此楼   关注TA 给TA发消息 送TA红花 TA的回帖

s091450

新虫 (小有名气)

【答案】应助回帖


jiangyun2: 金币+1, 谢谢回帖交流,欢迎常来~~ 2013-09-09 12:31:32
加入醇可以控制球形载体的分散情况  防止球形的聚一起
我的师兄做过   加入醇后 单个球形的可以分的很开
5楼2013-09-09 11:23:33
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] 300分求调剂 (085501机械专硕,本科扬大) +9 xu@841019 2026-04-11 10/500 2026-04-14 08:48 by 木木mumu~
[考研] 机械工程313分找工科调剂 +4 双一流本科机械 2026-04-08 4/200 2026-04-14 07:32 by Abskk
[考研] 求助调剂,跨调 +15 X十甫寸Y 2026-04-11 16/800 2026-04-14 05:44 by 西北望—风沙
[考研] 化学070300 求调剂 +21 哈哈哈^_^ 2026-04-12 21/1050 2026-04-13 21:36 by nxybio2007
[考研] 344 材料专业 求调剂211 无地域要求 +8 hualkop 2026-04-11 8/400 2026-04-12 22:24 by fqwang
[考研] 本科南方医科大学 一志愿985 药学学硕284分 求调剂 +5 弱水听文 2026-04-09 5/250 2026-04-12 13:16 by shengxi123
[考研] 中药学调剂 初试324 +4 洋甘菊、 2026-04-10 6/300 2026-04-11 09:41 by gong120082
[考研] 282,求调剂 +12 jggshjkkm 2026-04-09 14/700 2026-04-11 09:39 by 猪会飞
[考研] 一志愿东北大学控制工程085406数二英二385,求调剂 +8 Ezra_Zhang 2026-04-09 8/400 2026-04-11 09:15 by 猪会飞
[考研] 346,工科0854求调剂,专硕 +7 moser233 2026-04-10 8/400 2026-04-11 08:52 by 猪会飞
[考研] 一志愿北理工298英一数二已上岸,感谢各位老师 +14 Reframe 2026-04-10 16/800 2026-04-10 23:07 by caotw2020
[考研] 调剂 +12 卷卷卷心菜_ 2026-04-09 13/650 2026-04-10 22:36 by Ftglcn90
[考研] 309求调剂 +14 wdhw 2026-04-10 15/750 2026-04-10 21:06 by zhouxiaoyu
[考研] 一志愿京区985,085401,与本科专业一致,电子信息工程, +4 阳光开朗的男孩 2026-04-10 4/200 2026-04-10 18:27 by shenrf
[考研] 材料专硕(0856) 339分求调剂 +9 哈哈哈鹅哈哈哈 2026-04-09 10/500 2026-04-09 20:01 by Orcid
[考研] 332,085601求调剂 +12 ydfyh 2026-04-09 14/700 2026-04-09 17:28 by wp06
[考研] 材料工程322 +18 哈哈哈吼吼吼哈 2026-04-07 19/950 2026-04-09 10:44 by cymywx
[考研] 二次调剂求老师收留 +3 笑笑袁 2026-04-08 3/150 2026-04-08 23:50 by 醉在风里
[考研] 软件工程求调剂22软工296分求调剂,接受跨调 +4 yangchen2017 2026-04-08 5/250 2026-04-08 21:56 by 土木硕士招生
[考研] 电子信息346 +4 zuoshaodian 2026-04-08 4/200 2026-04-08 11:54 by zzucheup
信息提示
请填处理意见