 |
 |
 |
 |
 |
 |
||
 |
 |
 |
 |
 |
| 查看: 5070 | 回復: 13 | |||||
ccshiyu銀蟲 (小有名氣)
|
[交流]
【求助】求助關(guān)于金屬氧化物表面羥基的形成原因，達人速進 已有6人參與
|
||||
|
請問各位蟲友 金屬氧化物表面的羥基是金屬氫氧化物高溫焙燒脫水形成的？還是金屬氧化物吸附空氣中的水分子形成的？還是兩者都有？ 如果是吸附水分子形成的，那么這種羥基會穩(wěn)定的存在于金屬氧化物表面么？ B酸的形成是因為L酸吸附水而形成的么？ |
回復此樓» 收錄本帖的淘帖專輯推薦
 逛木蟲 隨便學 | 科研的那些事 |
» 猜你喜歡
材料/化學相關(guān)專業(yè)2026級學術(shù)/專業(yè)型碩士研究生
已經(jīng)有19人回復
-
求催化作用基礎(chǔ)第三版 （甄開吉) 課件
已經(jīng)有3人回復
-
化學工程及工業(yè)化學論文潤色/翻譯怎么收費?
已經(jīng)有148人回復
-
26年材料/化學相關(guān)專業(yè)博士研究生招生 溫州大學化學與材料工程學院(26年秋季入學)
已經(jīng)有0人回復
-
求助電催化劑制備，怎么在碳布表面生長PdCo合金
已經(jīng)有0人回復
-
求助電催化劑制備，怎么在碳布表面生長PdCo合金
已經(jīng)有0人回復
-
304求調(diào)劑
已經(jīng)有3人回復
-
上海華東理工大學機械與動力工程學院先進材料與制造研究組招聘公告
已經(jīng)有0人回復
-
304求調(diào)劑
已經(jīng)有1人回復
-
ANSYS 靜態(tài)結(jié)構(gòu) 多線性隨動硬化 應(yīng)變值怎么計算
已經(jīng)有1人回復
» 本主題相關(guān)商家推薦: (我也要在這里推廣)
» 本主題相關(guān)價值貼推薦，對您同樣有幫助:
- 【號外！號外！】金屬版達人評選報名開始啦！
已經(jīng)有18人回復
- 有關(guān)2012csc申請的幾個問題，請達人踴躍回答
已經(jīng)有21人回復
- 這是回火馬氏體嗎？急，下午預答辯，求助達人幫忙
已經(jīng)有14人回復
- 求助環(huán)保達人，固體廢棄物重金屬浸出到底用什么方法？
已經(jīng)有8人回復
- 急求達人——中國有色金屬進出口江蘇公司，了解的請進
已經(jīng)有13人回復
- 請達人幫忙看一下，編輯如下的拒稿理由能否debate一下
已經(jīng)有6人回復
- 【求助】求達人告知氧化鋁8種晶型的區(qū)別
已經(jīng)有13人回復
- 【求助】請問達人福建農(nóng)科院碩士進去待遇如何，謝謝！
已經(jīng)有16人回復
americanyk
榮譽版主 (文壇精英)
Excellent
- C-EPI: 1
- 應(yīng)助: 5 (幼兒園)
- 貴賓: 2.083
- 金幣: 31168.1
- 散金: 1082
- 紅花: 33
- 沙發(fā): 109
- 帖子: 10328
- 在線: 936.2小時
- 蟲號: 356055
- 注冊: 2007-04-26
- 性別: GG
- 專業(yè): 催化化學
- 管轄: 生物材料
★ ★
ccshiyu(金幣+3):感謝版主的詳細回復 2010-06-02 22:37:36
liconglin970410(金幣+1):多謝指點，歡迎常來交流 2010-06-08 13:50:33
tangjy(金幣+1):謝謝回帖交流 2010-10-19 14:13:32
ccshiyu(金幣+3):感謝版主的詳細回復 2010-06-02 22:37:36
liconglin970410(金幣+1):多謝指點，歡迎常來交流 2010-06-08 13:50:33
tangjy(金幣+1):謝謝回帖交流 2010-10-19 14:13:32
|
[quote]Originally posted by ccshiyu at 2010-06-02 08:26:06: 1.金屬氧化物表面的羥基是金屬氫氧化物高溫焙燒脫水形成的？還是金屬氧化物吸附空氣中的水分子形成的？還是兩者都有？ Answer: 金屬氧化物表面的羥基是金屬氫氧化物焙燒脫水形成的--Main 金屬氧化物吸附空氣中的水分子形成的--Little 2.如果是吸附水分子形成的，那么這種羥基會穩(wěn)定的存在于金屬氧化物表面么？ Depend on the conditions. The bond is noramlly weak. |
4樓2010-06-02 18:40:27
zhouyang1224
新蟲 (小有名氣)
- 應(yīng)助: 0 (幼兒園)
- 金幣: 187.3
- 紅花: 1
- 帖子: 200
- 在線: 55.6小時
- 蟲號: 1120345
- 注冊: 2010-10-12
- 專業(yè): 金屬基復合材料
13樓2012-08-23 15:35:40
 |
2樓2010-06-02 15:27:48
ccshiyu
銀蟲 (小有名氣)
- 應(yīng)助: 0 (幼兒園)
- 金幣: 431.3
- 帖子: 116
- 在線: 25.3小時
- 蟲號: 289343
- 注冊: 2006-10-22
- 性別: GG
- 專業(yè): 應(yīng)用有機化學
3樓2010-06-02 15:55:51
aust_jhe
至尊木蟲 (著名寫手)
- C-EPI: 1
- 應(yīng)助: 62 (初中生)
- 金幣: 17354.5
- 紅花: 9
- 帖子: 1192
- 在線: 209.6小時
- 蟲號: 430372
- 注冊: 2007-08-05
- 性別: GG
- 專業(yè): 催化化學
5樓2010-06-02 18:47:43
江偉
木蟲 (正式寫手)
- 應(yīng)助: 0 (幼兒園)
- 金幣: 4002.5
- 散金: 16
- 紅花: 1
- 帖子: 329
- 在線: 147.3小時
- 蟲號: 641912
- 注冊: 2008-10-31
- 性別: GG
- 專業(yè): 電化學分析
6樓2010-06-02 23:03:49
★
ccshiyu(金幣+2):謝謝交流。如果按你的說法，焙燒后催化劑的B酸性位主要基于氫氧化物高溫脫水為金屬氧化物而形成的了 2010-06-03 10:17:47
tangjy(金幣+1):謝謝回帖交流 2010-10-19 14:13:56
ccshiyu(金幣+2):謝謝交流。如果按你的說法，焙燒后催化劑的B酸性位主要基于氫氧化物高溫脫水為金屬氧化物而形成的了 2010-06-03 10:17:47
tangjy(金幣+1):謝謝回帖交流 2010-10-19 14:13:56
|
1、氫氧化物部分失水產(chǎn)生表面羥基。 2、吸附水也可以產(chǎn)生羥基，強弱與金屬氧化物性質(zhì)有關(guān)，可以類似于表面水解反應(yīng)。 3、吸附或水解產(chǎn)生的羥基根據(jù)性質(zhì)不同焙燒時可能失水減少或消失。 4、L酸可以水解形成B酸。 5、有的氧化物可以發(fā)生還原產(chǎn)生表面羥基，例如MoO3 |
7樓2010-06-03 08:15:00
8樓2010-10-19 10:57:24
jinkai838
木蟲 (著名寫手)
- C-EPI: 4
- 應(yīng)助: 0 (幼兒園)
- 貴賓: 0.539
- 金幣: 2004.5
- 散金: 304
- 紅花: 51
- 沙發(fā): 1
- 帖子: 1634
- 在線: 306.8小時
- 蟲號: 499385
- 注冊: 2008-02-10
- 性別: GG
- 專業(yè): 計算機科學的基礎(chǔ)理論
|
Surface Oxide—Support Interactions in the Molecular Design of Supported Metal Oxide Selective Oxidation Catalysts A series of metal oxides were deposited on the surface of different oxide supports to study the surface oxide - support interactions. The dehydrated Raman spectra of the supported metal oxide catalysts reveal the presence and structure of the supported metal oxide phases. The same surface metal oxide species were found on the different oxide supports for each of the supported metal oxide systems. The reactivity of the surface metal oxide species, however, depends on the specific oxide support (TiO2~ZrO2>Nb2O5>Al2O3~SiO2). For a given oxide support, the reactivity depends on the specific surface metal oxide species (e.g. V0x > MoOy). The redox activation energy for all the surface metal oxide phases lie in the range of 18-22 kcal/mole. The similar activation energies suggests that the number of active sites and/or the activity per site is responsible for the difference in reactivity. The redox TON for the methanol oxidation reaction correlates with the reduction temperature during TPR experiments, which suggests that the bridging M-O-Support bond controls the activity during redox reactions. |
9樓2010-10-19 14:45:07
jinkai838
木蟲 (著名寫手)
- C-EPI: 4
- 應(yīng)助: 0 (幼兒園)
- 貴賓: 0.539
- 金幣: 2004.5
- 散金: 304
- 紅花: 51
- 沙發(fā): 1
- 帖子: 1634
- 在線: 306.8小時
- 蟲號: 499385
- 注冊: 2008-02-10
- 性別: GG
- 專業(yè): 計算機科學的基礎(chǔ)理論
|
Israel Wachs iew.jpg G. Whitney Snyder Professor and Professor of Chemical Engineering Director, Operando Molecular Spectroscopy and Catalysis Research Lab Ph.D. Stanford University, 1977 M.S. Stanford University, 1974 B.E. City College of New York, 1973 Our research focuses on surface oxides and has demonstrated that, for many two-component metal oxide systems, one metal oxide may be present as an atomically dispersed phase over a second metal oxide substrate. The state of the atomically dispersed metal oxide, the surface oxide, has a different structure from that of its bulk unsupported oxide counterpart. This structural difference usually results in very different chemical properties. Our studies have shown that a relationship exists between the metal oxide structure and its surface reactivity (reduction properties and catalytic activity or selectivity). The complex structures of the atomically dispersed surface oxides are poorly understood. The focus of our program is therefore to examine systematically the various structures of these atomically dispersed surface oxides on oxide substrates and to determine the factors that control the metal oxide structure. Much of the structural information about surface oxides can be provided with modern laser Raman spectroscopy because of the dependence of the Raman spectrum on the structure of the scattering material. Another of our goals is to define the relationship between surface oxide structures and their various physical and chemical properties. A better understanding of the synthesis and materials science/solid-state chemistry of the surface oxides is also emerging from this research program. The insight generated from this research has implications for metal oxide catalysts, ceramic materials, pigment materials, and electronic devices which find wide application in the pollution control industry, chemical industry, petroleum industry and the advanced materials industries |
10樓2010-10-19 14:49:45
相關(guān)版塊跳轉(zhuǎn)
我要訂閱樓主 ccshiyu 的主題更新
| 最具人氣熱帖推薦 [查看全部] | 作者 | 回/看 | 最后發(fā)表 | |
|---|---|---|---|---|
|
[考研] 一志愿中海洋材料工程專碩330分求調(diào)劑 +3 | 小材化本科 2026-03-18 | 3/150 |
|
|---|---|---|---|---|
|
[考研] 295求調(diào)劑 +3 | 一志愿京區(qū)211 2026-03-18 | 5/250 |
|
|
|
[考研] 354求調(diào)劑 +3 | Tyoumou 2026-03-18 | 5/250 |
|
|
|
[考研] 一志愿天大材料與化工（085600）總分338 +3 | 蔡大美女 2026-03-13 | 3/150 |
|
|
|
[考研] 297求調(diào)劑 +8 | 戲精丹丹丹 2026-03-17 | 8/400 |
|
|
|
[考研] 299求調(diào)劑 +5 | △小透明* 2026-03-17 | 5/250 |
|
|
|
[考研] 0703化學求調(diào)劑 總分331 +3 | ZY-05 2026-03-13 | 3/150 |
|
|
|
[考研] 301求調(diào)劑 +9 | yy要上岸呀 2026-03-17 | 9/450 |
|
|
|
[考博] 26博士申請 +3 | 1042136743 2026-03-17 | 3/150 |
|
|
|
[考研] 【0856】化學工程（085602）313 分，本科學科評估A類院�；瘜W工程與工藝，誠求調(diào)劑 +7 | 小劉快快上岸 2026-03-11 | 8/400 |
|
|
|
[考研] 274求調(diào)劑 +5 | 時間點 2026-03-13 | 5/250 |
|
|
|
[考研] 機械專碩325，尋找調(diào)劑院校 +3 | y9999 2026-03-15 | 5/250 |
|
|
|
[考研] 一志愿華中師范071000，325求調(diào)劑 +6 | RuitingC 2026-03-12 | 6/300 |
|
|
|
[考研] 327求調(diào)劑 +6 | 拾光任染 2026-03-15 | 11/550 |
|
|
|
[考研]
 機械專碩調(diào)劑
+3
|
笨笨兔子 2026-03-12 | 3/150 |
|
|
|
[考研] 材料080500調(diào)劑求收留 +3 | 一顆meteor 2026-03-13 | 3/150 |
|
|
|
[考研] 266求調(diào)劑 +4 | 學員97LZgn 2026-03-13 | 4/200 |
|
|
|
[考研] 311求調(diào)劑 +3 | 冬十三 2026-03-13 | 3/150 |
|
|
|
[考研] 310求調(diào)劑 +3 | 【上上簽】 2026-03-11 | 3/150 |
|
|
|
[考研] 材料專碩350 求調(diào)劑 +4 | 王金科 2026-03-12 | 4/200 |
|