| DC 欄位 |
值 |
語言 |
| DC.contributor | 化學工程與材料工程學系 | zh_TW |
| DC.creator | 蔡俊煌 | zh_TW |
| DC.creator | Chun-Huang Tsai | en_US |
| dc.date.accessioned | 2002-6-24T07:39:07Z | |
| dc.date.available | 2002-6-24T07:39:07Z | |
| dc.date.issued | 2002 | |
| dc.identifier.uri | http://ir.lib.ncu.edu.tw:444/thesis/view_etd.asp?URN=89321036 | |
| dc.contributor.department | 化學工程與材料工程學系 | zh_TW |
| DC.description | 國立中央大學 | zh_TW |
| DC.description | National Central University | en_US |
| dc.description.abstract | 摘要
本研究以共沈澱法製備具有不同Mg/Al比例及不同Ni負載量的hydrotalcite先驅物Ni/HT(x)，經高溫煅燒製得觸媒Ni/HTc(x)。利用X光繞射光譜(XRD)、全表面積測定 (BET) 、X-光電子光譜儀 (XPS) 、氫程溫脫附 (H2-TPD) 、氫程溫還原 (H2-TPR) 對觸媒的物理結構及表面性質做鑑定分析。藉由CH4/CO2重組反應測試，探討不同煅燒溫度、還原溫度、Mg/Al比例、Ni負載量及反應溫度之影響，並進行長時間反應穩定性測試，觀察上述之不同變因對觸媒壽命期之影響，並以程溫氫化反應(H2-TPSR)分析觸媒表面積碳，探討觸媒積碳阻抗的能力。
Ni/HTc(x)於800℃煅燒具有高表面積(125 m2/g以上)，原觸媒先驅物Ni/HT(x)的hydrotalcite層狀結構經高溫煅燒瓦解形成Mg-Al-O共氧化物，隨著煅燒溫度上升，NiO與MgO逐漸形成固溶。Ni/HTc(x)觸媒不易還原，所需的還原溫度較傳統觸媒Ni/γ-Al2O3及Ni/SiO2高出釵h，且隨著煅燒溫度和Mg/Al比例的增加而增加，此外XPS表面組成分析發現Ni/(Mg+Al)莫耳比隨著煅燒溫度上升而下降，進一步證實NiO和MgO確實形成固溶，增加NiO-MgO之間的作用力。
CH4/CO2重組反應結果知CO2轉化率皆高於CH4轉化率，且CO/H2比值介於1.0~1.2之間。RWGS反應是主要的副反應，同時亦發生蒸氣重組反應，使CO/H2比值趨近於理論值1。CH4及CO2轉化率隨Ni負載量、還原及反應溫度上升而增加；隨煅燒溫度及Mg/Al比上升而減小。CH4/CO2重組反應結果以800℃煅燒，500℃還原，Mg/Al比3，8%Ni負載量，700℃反應溫度條件下的8%Ni/HTc(3)觸媒有較好的穩定性。8%Ni/HTc(3)與8%Ni/HTc(3)im(含浸法製備)、8%Ni/γ-Al2O3及8%Ni/SiO2觸媒進行CH4/CO2重組反應比較下，8%Ni/HTc(3)觸媒有最佳穩定性，H2-TPD計算得8%Ni/HTc(3)有最佳分散度，H2-TPSR亦發現8%Ni/HTc(3)觸媒有最佳的積碳阻抗。 | zh_TW |
| dc.description.abstract | In this study,we prepared different Mg/Al ratios and Ni loading precursor by coprecipitation method,and then calcined at high temperature to prepare Ni/HTc(x) catalysts.
XRD 、BET、XPS、H2-TPR、H2-TPD were used to study the structure and surface properties.
The effect of different calcination temperature、reducing temperature、Mg/Al ratios、Ni loading and reaction temperature was studied by CH4/CO2 reforming.H2-TPSR was used to study coking resistance of catalyst.
Ni/HT(x) has the same structure with hydrotalcite,after calcined at high temperature,the layer stuucture was collased and became Mg-Al-O mixed-oxides,the surface also increased. As the calcined temperature increased NiO and MgO became solid solution.
It is hard to reduce Ni/HTc(x) catalyst,and reducing temperature is higher than Ni/γ-Al2O3 and Ni/SiO2 catalyst. XPS found that Ni/(Mg+Al) ratio reduce as calcination temperature increase,furthre prove NiO and MgO were formed solid solution.
In CH4/CO2 reformimg we found that 8%Ni/HTc(3) catalyst ,calcined at 800℃ ,reduced at 500℃ , Mg/Al ratio is 3,and 700℃ reaction temperature had the best stability than 8%Ni/γ-Al2O3,8%Ni/SiO2. H2-TPSR also found that 8%Ni/HTc(3) had best coking resistance. | en_US |
| DC.subject | 合成氣 | zh_TW |
| DC.subject | 鎳鎂鋁氧觸媒 | zh_TW |
| DC.subject | 重組反應 | zh_TW |
| DC.subject | Surported Nickel Catalyst | en_US |
| DC.subject | Mg/Al mixed oxide | en_US |
| DC.subject | Hydrotalcite | en_US |
| DC.subject | Syngas | en_US |
| DC.subject | CH4/CO2 reforming | en_US |
| DC.title | Ni/Mg-Al-O觸媒於CH4/CO2重組反應之研究 | zh_TW |
| dc.language.iso | zh-TW | zh-TW |
| DC.title | CO2 Reforming of Methane on Ni/Mg-Al-O Catalyst | en_US |
| DC.type | 博碩士論文 | zh_TW |
| DC.type | thesis | en_US |
| DC.publisher | National Central University | en_US |