| 查看: 17413 | 回复: 174 | ||||||||||||
| 本帖产生 1 个 C-EPI ，点击这里进行查看 | ||||||||||||
| 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 | ||||||||||||
wandaohzl荣誉版主 (著名写手)
|
[交流]
【建议】催化的一篇nature 大家看看现在最新的研究动态！ 已有159人参与
|
|||||||||||
|
Controlled selectivity for palladium catalysts using self-assembled monolayers ABSTRACT: The selective reaction of one part of a bifunctional molecule is a fundamental challenge in heterogeneous catalysis and for many processes including the conversion of biomass-derived intermediates. Selective hydrogenation of unsaturated epoxides to saturated epoxides is particularly difficult given the reactivity of the strained epoxide ring, and traditional platinum group catalysts show low selectivities. We describe the preparation of highly selective Pd catalysts involving the deposition of n-alkanethiol self-assembled monolayer (SAM) coatings. These coatings improve the selectivity of 1-epoxybutane formation from 1-epoxy-3-butene on palladium catalysts from 11 to 94% at equivalent reaction conditions and conversions. Although sulphur species are generally considered to be indiscriminate catalyst poisons, the reaction rate to the desired product on a catalyst coated with a thiol was 40% of the rate on an uncoated catalyst. Interestingly the activity decreased for less-ordered SAMs with shorter chains. The behaviour of SAM-coated catalysts was compared with catalysts where surface sites were modified by carbon monoxide, hydrocarbons or sulphur atoms. The results suggest that the SAMs restrict sulphur coverage to enhance selectivity without significantly poisoning the activity of the desired reaction.      http://d.namipan.com/d/ed0457de5 ... 558da2d903e2b4a0400 [ Last edited by wandaohzl on 2010-9-20 at 19:42 ] |
回复此楼» 收录本帖的淘帖专辑推荐
 半导体光催化与纳米TiO2 | 催化 | 催化剂 | Biomass and catalysis |
| 催化剂及其他 | 催化科研软件及资料 | 氯苯 催化 | Papers＆Univ |
| 不懂问题 |
» 本帖已获得的红花（最新10朵）
ljlwzwb» 猜你喜欢
中国地质大学杨明教授组招收2027年博士能源化学、催化材料方向（每月5K+）
已经有56人回复
-
中国地质大学杨明教授组招收2027年博士能源化学、催化材料方向（每月5K+）
已经有58人回复
-
专业论文润色/翻译怎么收费?
已经有133人回复
-
东南大学杰青团队-催化方向硕博士生、博士后、科研助理招募
已经有0人回复
-
北京工业大学_能源催化（能源环境协同催化）_方向拟招收2027年学术和专业学位博士生
已经有4人回复
-
上海华东理工大学2027年海内外人才招聘
已经有1人回复
-
南京理工大学化学与化工学院招博士研究生1-2名
已经有1人回复
» 本主题相关价值贴推荐，对您同样有帮助:
- 最新一篇JACS光催化论文赏析，欢迎大家一起来讨论~
已经有182人回复
- 从一篇nature文章看明场TEM和选区电子衍射分析
已经有8人回复
- 文献学习：Co3O4零下77度催化氧化CO（TEM和动力学分析可以发nature）
已经有34人回复
- 大家快来看看啊，Ishii-Venturello 催化剂中有四个氧原子怎么是三价的？
已经有27人回复
- 【求助】请大家帮我看看Applied Catalysis B 的审稿意见吧，谢谢啦
已经有14人回复
- 【求助】Au/CeO2催化剂XPS表征,大家看看这个怎么分析？
已经有13人回复
lggm208
木虫 (正式写手)
- 应助: 16 (小学生)
- 金币: 2276.7
- 散金: 388
- 红花: 11
- 帖子: 845
- 在线: 121.5小时
- 虫号: 569764
- 注册: 2008-06-06
- 性别: GG
- 专业: 能源化工
6楼2010-09-21 08:30:52
