Density functional theory study of ethanol decomposition reaction over Ni/α-Al2O3(0001) surface
碩士 === 國立臺灣科技大學 === 化學工程系 === 96 === Ethanol decomposition on clean α-Al2O3 (0001) and Ni/α-Al2O3 (0001) surface was studied using periodic DFT calculations. Our results are compared with the available experimental findings of ethanol steam reforming reaction. For n Ni atoms (n=3–4) deposition on α-...
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ndltd-TW-096NTUS50630332016-05-13T04:15:16Z http://ndltd.ncl.edu.tw/handle/17855359730641666318 Density functional theory study of ethanol decomposition reaction over Ni/α-Al2O3(0001) surface 以密度泛函理論研究乙醇在Ni/α-Al2O3(0001)觸媒表面上之裂解反應 Ya-chin Cheng 程雅琴 碩士 國立臺灣科技大學 化學工程系 96 Ethanol decomposition on clean α-Al2O3 (0001) and Ni/α-Al2O3 (0001) surface was studied using periodic DFT calculations. Our results are compared with the available experimental findings of ethanol steam reforming reaction. For n Ni atoms (n=3–4) deposition on α-Al2O3(0001) surface, the preferential structure is forming cluster rather than dispersion on surface. Triangle Ni3 cluster adsorption on 2 × 2 α-Al2O3(0001) surface is used to represent Ni/α-Al2O3(0001) surface. The considered possible pathways for ethanol decomposition on clean α-Al2O3 (0001) and Ni/α-Al2O3 (0001) surface include dehydrogenation and C-C bond cleavage. Clean α-Al2O3 (0001) surface favors the reaction of ethanol dehydration to ethylene or leading to stable intermediate (CH2CHO) which finally occupies the active site of surface. Ni/α-Al2O3 (0001) surface shows high activity to inhibit coke formation, one feasible channel leading to C-C bond breaking was proposed. The C-C bond in CH2CO intermediate can be weaken via transforming the adsorption structure to increase the coordination number of the two carbon atoms with the surface of Ni cluster. The CH2CH2O(a) → CH2CHO (a) + H(a) reaction is the rate-determining step for the overall reaction (‡E = 1.20 eV). CO oxidation on Ni/α-Al2O3 (0001) surface is also investigated and the DOS analysis for CO adsorption on Ni bridge site shows that the interaction is mainly contributed from CO(5σ)-Ni charge donation and Ni(d)-2π* backdonation. Jyh-Chiang Jiang 江志強 2008 學位論文 ; thesis 107 en_US |
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碩士 === 國立臺灣科技大學 === 化學工程系 === 96 === Ethanol decomposition on clean α-Al2O3 (0001) and Ni/α-Al2O3 (0001) surface was studied using periodic DFT calculations. Our results are compared with the available experimental findings of ethanol steam reforming reaction. For n Ni atoms (n=3–4) deposition on α-Al2O3(0001) surface, the preferential structure is forming cluster rather than dispersion on surface. Triangle Ni3 cluster adsorption on 2 × 2 α-Al2O3(0001) surface is used to represent Ni/α-Al2O3(0001) surface. The considered possible pathways for ethanol decomposition on clean α-Al2O3 (0001) and Ni/α-Al2O3 (0001) surface include dehydrogenation and C-C bond cleavage. Clean α-Al2O3 (0001) surface favors the reaction of ethanol dehydration to ethylene or leading to stable intermediate (CH2CHO) which finally occupies the active site of surface. Ni/α-Al2O3 (0001) surface shows high activity to inhibit coke formation, one feasible channel leading to C-C bond breaking was proposed. The C-C bond in CH2CO intermediate can be weaken via transforming the adsorption structure to increase the coordination number of the two carbon atoms with the surface of Ni cluster. The CH2CH2O(a) → CH2CHO (a) + H(a) reaction is the rate-determining step for the overall reaction (‡E = 1.20 eV). CO oxidation on Ni/α-Al2O3 (0001) surface is also investigated and the DOS analysis for CO adsorption on Ni bridge site shows that the interaction is mainly contributed from CO(5σ)-Ni charge donation and Ni(d)-2π* backdonation.
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author2 |
Jyh-Chiang Jiang |
author_facet |
Jyh-Chiang Jiang Ya-chin Cheng 程雅琴 |
author |
Ya-chin Cheng 程雅琴 |
spellingShingle |
Ya-chin Cheng 程雅琴 Density functional theory study of ethanol decomposition reaction over Ni/α-Al2O3(0001) surface |
author_sort |
Ya-chin Cheng |
title |
Density functional theory study of ethanol decomposition reaction over Ni/α-Al2O3(0001) surface |
title_short |
Density functional theory study of ethanol decomposition reaction over Ni/α-Al2O3(0001) surface |
title_full |
Density functional theory study of ethanol decomposition reaction over Ni/α-Al2O3(0001) surface |
title_fullStr |
Density functional theory study of ethanol decomposition reaction over Ni/α-Al2O3(0001) surface |
title_full_unstemmed |
Density functional theory study of ethanol decomposition reaction over Ni/α-Al2O3(0001) surface |
title_sort |
density functional theory study of ethanol decomposition reaction over ni/α-al2o3(0001) surface |
publishDate |
2008 |
url |
http://ndltd.ncl.edu.tw/handle/17855359730641666318 |
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