Morphology Control of Cerium Oxide Nanocrystal and It Effect to Ethanol Reforming Reaction

碩士 === 國立交通大學 === 應用化學系所 === 94 === In this study , two methods, including (1) coprecipritation and (2) hydrothermal processes, were carried out to generate CeO2 nanocrystals with various shapes. On the basis of on the SEM study, the first method only produced polycrystalline CeO2 whereas the second...

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Main Authors: WeiYing Shiao, 蕭偉印
Other Authors: ChiShen Lee
Format: Others
Language:zh-TW
Published: 2006
Online Access:http://ndltd.ncl.edu.tw/handle/65675155443633728237
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spelling ndltd-TW-094NCTU55000252016-05-27T04:18:34Z http://ndltd.ncl.edu.tw/handle/65675155443633728237 Morphology Control of Cerium Oxide Nanocrystal and It Effect to Ethanol Reforming Reaction 奈米氧化鈰構形控制對乙醇轉氫效率研究 WeiYing Shiao 蕭偉印 碩士 國立交通大學 應用化學系所 94 In this study , two methods, including (1) coprecipritation and (2) hydrothermal processes, were carried out to generate CeO2 nanocrystals with various shapes. On the basis of on the SEM study, the first method only produced polycrystalline CeO2 whereas the second method can generate rod and cube shape of CeO2. According to the TEM images , we found that the predominantly exposed planes are {001} in cerium oxide nanocubes . The predominantly exposed planes are {001} and {110} in cerium oxide nanorods . The catalytic activity for the conversion of ethanol to hydrogen have been carried out using the 5% wt Rh/CeO2 as the catalysts with as-synthesized CeO2 rods and cubes. The results from H2 selectivity, the effect of C/O ratio and stability test indicate that the cerium oxide which exposed planes under controlled more active than catalyst with irregular shape of CeO2 particles . Under the same condition , hydrogen selectivity of the cerium oxide nanorod catalyst is 10% higher than that of the catalyst prepared by impregnation method whose hydrogen selectivity is about 116% . However , the H2 selectivity for catalyst with rod and cube CeO2 gradually decrease after 24 hours, indicating the {100} and {110} surface are not stable at high temperature . ChiShen Lee 李積琛 2006 學位論文 ; thesis 50 zh-TW
collection NDLTD
language zh-TW
format Others
sources NDLTD
description 碩士 === 國立交通大學 === 應用化學系所 === 94 === In this study , two methods, including (1) coprecipritation and (2) hydrothermal processes, were carried out to generate CeO2 nanocrystals with various shapes. On the basis of on the SEM study, the first method only produced polycrystalline CeO2 whereas the second method can generate rod and cube shape of CeO2. According to the TEM images , we found that the predominantly exposed planes are {001} in cerium oxide nanocubes . The predominantly exposed planes are {001} and {110} in cerium oxide nanorods . The catalytic activity for the conversion of ethanol to hydrogen have been carried out using the 5% wt Rh/CeO2 as the catalysts with as-synthesized CeO2 rods and cubes. The results from H2 selectivity, the effect of C/O ratio and stability test indicate that the cerium oxide which exposed planes under controlled more active than catalyst with irregular shape of CeO2 particles . Under the same condition , hydrogen selectivity of the cerium oxide nanorod catalyst is 10% higher than that of the catalyst prepared by impregnation method whose hydrogen selectivity is about 116% . However , the H2 selectivity for catalyst with rod and cube CeO2 gradually decrease after 24 hours, indicating the {100} and {110} surface are not stable at high temperature .
author2 ChiShen Lee
author_facet ChiShen Lee
WeiYing Shiao
蕭偉印
author WeiYing Shiao
蕭偉印
spellingShingle WeiYing Shiao
蕭偉印
Morphology Control of Cerium Oxide Nanocrystal and It Effect to Ethanol Reforming Reaction
author_sort WeiYing Shiao
title Morphology Control of Cerium Oxide Nanocrystal and It Effect to Ethanol Reforming Reaction
title_short Morphology Control of Cerium Oxide Nanocrystal and It Effect to Ethanol Reforming Reaction
title_full Morphology Control of Cerium Oxide Nanocrystal and It Effect to Ethanol Reforming Reaction
title_fullStr Morphology Control of Cerium Oxide Nanocrystal and It Effect to Ethanol Reforming Reaction
title_full_unstemmed Morphology Control of Cerium Oxide Nanocrystal and It Effect to Ethanol Reforming Reaction
title_sort morphology control of cerium oxide nanocrystal and it effect to ethanol reforming reaction
publishDate 2006
url http://ndltd.ncl.edu.tw/handle/65675155443633728237
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