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

heibin1984

金虫 (小有名气)

应助: 0 (幼儿园)
金币: 1916.3
帖子: 171
在线: 35.2小时
虫号: 315298
注册: 2007-03-01
性别: GG
专业: 药物材料

[交流] 【求助】wet impregnation 和 impregnation 的区别？

看到一篇文献，讲到制备时用到“wet impregnation",不知道这个和单独的impregnation有什么区别，有哪位大师能够指点一下啊？

回复此楼

» 猜你喜欢

浙江师范大学国家杰青杨启华教授团队招收2026年博士研究生已经有34人回复
南通大学电气与自动化学院2026年优秀博士招聘公告已经有0人回复
物理化学论文润色/翻译怎么收费? 已经有275人回复
国家级人才课题组招收2026年入学博士已经有2人回复
乙酰化透明质酸钠的改性实验求助已经有0人回复
【陕西师范大学】催化化学方向招收2026年博士研究生1名（申请-考核）已经有4人回复
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
国家级人才课题组招收2026年入学博士已经有5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28人回复

1楼 2009-07-10 11:32:07

已阅回复此楼关注TA 给TA发消息送TA红花 TA的回帖

黄河第一桥

金虫 (正式写手)

应助: 10 (幼儿园)
金币: 121.6
散金: 29
红花: 4
帖子: 794
在线: 155小时
虫号: 111143
注册: 2005-11-20
性别: GG
专业: 催化化学

大家借鉴一下Catalyst Preparation, Science and Engineering

★
小木虫(金币+0.5):给个红包，谢谢回帖交流

Type of impregnation Distinguishing
characteristics：Dry impregnation (DI)(known as pore filling and incipient wetness) Use sufficient metal solution to fill pore
volume of catalyst support; adjust
metal concentration for desired weight
loading
Advantages: Simplest to employ; no filtering;
metal content is fixed
Disadvantages: Strong precursor-support interaction
is not guaranteed
Wet impregnation (WI) Amount of solution in excess of pore
volume of support; precursors that
interact weakly with support are
evaporated or washed/filtered away
A: Mixing is improved
D: Filtering required; metal loading
must be measured; metal wasted if it
does not strongly interact with support
Strong electrostatic
adsorption (SEA)(ion adsorption)
Excess solution; pH held at optimal
value for strong precursor interaction
with support
A: Strong; monolayer adsorption of
metal precursor
D: Optimal pH must be determined and
achieved during preparation
Deposition-precipitation
(DP)
Excess solution; pH slowly and
homogeneously increased to
precipitate precursor at support surface
A: High metal loadings are most easily
achieved
D: pH must be altered during
preparation
Ion exchange (IE) Exchange of cationic metal precursors
with counterions in zeolite framework
A: Strong interaction of precursor with
zeolite is assured
D: Limited to cationic precursors
Reactive adsorption Driving force exists for reaction of
precursor with support
A: Strong interaction of precursor with
support is assured
D: Limited in applicability to certain
systems