CO2 Reforming of Methane on Ni/Mg-Al-O Catalyst
| Autor: | Chun-Huang Tsai, 蔡俊煌 |
|---|---|
| Rok vydání: | 2002 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 90 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. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
| Externí odkaz: |
|