語系:
繁體中文
English
說明(常見問題)
回圖書館首頁
手機版館藏查詢
登入
回首頁
切換:
標籤
|
MARC模式
|
ISBD
In situ Characterization of Promoted...
~
Palomino, Robert M.
FindBook
Google Book
Amazon
博客來
In situ Characterization of Promoted Rh Nanocatalysts During CO Hydrogenation.
紀錄類型:
書目-電子資源 : Monograph/item
正題名/作者:
In situ Characterization of Promoted Rh Nanocatalysts During CO Hydrogenation./
作者:
Palomino, Robert M.
出版者:
Ann Arbor : ProQuest Dissertations & Theses, : 2015,
面頁冊數:
139 p.
附註:
Source: Dissertation Abstracts International, Volume: 77-01(E), Section: B.
Contained By:
Dissertation Abstracts International77-01B(E).
標題:
Inorganic chemistry. -
電子資源:
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3722225
ISBN:
9781339042077
In situ Characterization of Promoted Rh Nanocatalysts During CO Hydrogenation.
Palomino, Robert M.
In situ Characterization of Promoted Rh Nanocatalysts During CO Hydrogenation.
- Ann Arbor : ProQuest Dissertations & Theses, 2015 - 139 p.
Source: Dissertation Abstracts International, Volume: 77-01(E), Section: B.
Thesis (Ph.D.)--State University of New York at Stony Brook, 2015.
The world's dependence on the limited supply of fossil fuels has provided the motivation for research into alternative renewable fuel sources. Ethanol is a promising alternative due to its low toxicity, high energy density, and compatibility with the current fuel distribution system. An attractive route to ethanol production would be through the conversion of synthesis gas or 'syngas' (CO + H2), which is currently used to produce methanol, hydrogen, and synthetic fuels (diesel and gasoline). However, there are currently no commercially used catalysts for efficient ethanol production from syngas. In general, catalysts for syngas conversion to ethanol should promote C?C coupling while suppressing methane formation. Previous studies have shown that oxide supported bi-metallic catalysts composed of noble and early transition metals can potentially meet these catalytic requirements, but identifying the structure and active phase of these systems under reaction conditions remains a significant challenge. This work focuses on in situ characterization of Fe-Rh bi-metallic catalysts supported on titania (TiO2) and ceria (CeO2). Synchrotron based techniques (X-ray diffraction, pair distribution function analysis, and X-ray absorption spectroscopy) are used to elucidate catalyst structure under reaction conditions, which is compared to the catalytic efficiency obtained via reactor studies from mass spectrometry and gas chromatography.
ISBN: 9781339042077Subjects--Topical Terms:
3173556
Inorganic chemistry.
In situ Characterization of Promoted Rh Nanocatalysts During CO Hydrogenation.
LDR
:04651nmm a2200313 4500
001
2119332
005
20170619080611.5
008
180830s2015 ||||||||||||||||| ||eng d
020
$a
9781339042077
035
$a
(MiAaPQ)AAI3722225
035
$a
AAI3722225
040
$a
MiAaPQ
$c
MiAaPQ
100
1
$a
Palomino, Robert M.
$3
3281202
245
1 0
$a
In situ Characterization of Promoted Rh Nanocatalysts During CO Hydrogenation.
260
1
$a
Ann Arbor :
$b
ProQuest Dissertations & Theses,
$c
2015
300
$a
139 p.
500
$a
Source: Dissertation Abstracts International, Volume: 77-01(E), Section: B.
500
$a
Adviser: Michael G. White.
502
$a
Thesis (Ph.D.)--State University of New York at Stony Brook, 2015.
520
$a
The world's dependence on the limited supply of fossil fuels has provided the motivation for research into alternative renewable fuel sources. Ethanol is a promising alternative due to its low toxicity, high energy density, and compatibility with the current fuel distribution system. An attractive route to ethanol production would be through the conversion of synthesis gas or 'syngas' (CO + H2), which is currently used to produce methanol, hydrogen, and synthetic fuels (diesel and gasoline). However, there are currently no commercially used catalysts for efficient ethanol production from syngas. In general, catalysts for syngas conversion to ethanol should promote C?C coupling while suppressing methane formation. Previous studies have shown that oxide supported bi-metallic catalysts composed of noble and early transition metals can potentially meet these catalytic requirements, but identifying the structure and active phase of these systems under reaction conditions remains a significant challenge. This work focuses on in situ characterization of Fe-Rh bi-metallic catalysts supported on titania (TiO2) and ceria (CeO2). Synchrotron based techniques (X-ray diffraction, pair distribution function analysis, and X-ray absorption spectroscopy) are used to elucidate catalyst structure under reaction conditions, which is compared to the catalytic efficiency obtained via reactor studies from mass spectrometry and gas chromatography.
520
$a
The first catalytic system studied is bimetallic Fe-Rh/TiO2, synthesized via two deposition methods: diblock co?polymer reverse micelle template and incipient wetness impregnation. Both approaches are used to control the particle size and overall composition in order to determine the effect each have on the catalyst structure. In general, the addition of Fe results in alloying with Rh. Further increasing Fe loading serves to increase the alloy concentration, but alloy formation is limited as metallic Fe forms in catalysts that contain over 4 wt% Fe. Ethanol selectivity was found to be dependent upon the alloyed Fe concentration. Fe?modification was also found to suppress the overall CO conversion when coupled with the methane suppression, the conclusion is that the alloying of Fe and Rh blocks active Rh sites responsible for methane formation and other side reactions. Fe from the alloy and metallic deposits was also found to be carburized into Fe3C during the reaction, but the presence of Fe3C had a negligible effect on the product distribution and CO conversion.
520
$a
The second major catalytic system studied consists of Fe?promoted Rh/CeO 2, synthesized via the incipient wetness impregnation method. The alloying of Fe and Rh is promoted on CeO2 compared to TiO2, where a larger concentration of Fe-Rh alloy was observed at lower Fe loadings than on TiO2. Metallic Fe was not formed, but Fe-Rh alloy formation began to plateau at ~5 wt% Fe, indicating that there is a limit to alloy formation. Fe from the alloy was carburized during the reaction, but as with TiO 2, a negligible effect was observed on product distribution and CO conversion. Ethanol selectivity also peaked at a lower Fe loading than TiO2-supported catalyst due to the promotion of Fe-Rh alloy on CeO2. Additionally, the ethanol enhancement peaked at ~ 3 wt% alloyed Fe and a further increase of alloy concentration lead to the suppression of ethanol and a subsequent increase in methane selectivity. Lastly, CeO2 differs from TiO 2 in that an interface with Fe promotes ethylene production. Overall, Fe-Rh/CeO2 appears to have reactivity comparable to TiO2-supported catalysts, where the maximum CO conversion and ethanol selectivity are arguably the same.
590
$a
School code: 0771.
650
4
$a
Inorganic chemistry.
$3
3173556
650
4
$a
Physical chemistry.
$3
1981412
690
$a
0488
690
$a
0494
710
2
$a
State University of New York at Stony Brook.
$b
Chemistry.
$3
2094227
773
0
$t
Dissertation Abstracts International
$g
77-01B(E).
790
$a
0771
791
$a
Ph.D.
792
$a
2015
793
$a
English
856
4 0
$u
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3722225
筆 0 讀者評論
館藏地:
全部
電子資源
出版年:
卷號:
館藏
1 筆 • 頁數 1 •
1
條碼號
典藏地名稱
館藏流通類別
資料類型
索書號
使用類型
借閱狀態
預約狀態
備註欄
附件
W9329950
電子資源
01.外借(書)_YB
電子書
EB
一般使用(Normal)
在架
0
1 筆 • 頁數 1 •
1
多媒體
評論
新增評論
分享你的心得
Export
取書館
處理中
...
變更密碼
登入