二氧化碳的甲烷重組反應可將同為溫室氣體之二氧化碳和甲烷轉化為合成氣(CO + H2)，此氣體可用於生產甲醇或液態燃料等。為提高應用於此反應之觸媒的反應活性及穩定性，本研究以檸檬酸凝膠法製備LaNiO3觸媒，並檢討其他元素的添加、擔體的利用和煆燒條件對觸媒改質的影響。
以檸檬酸凝膠法製備之前驅體粉末約在600 ℃開始形成LaNiO3相，於700 ℃煆燒2小時之LaNiO3觸媒粉末比表面積值為6.37 m2/g，粒徑約為130 nm。此粉末以GHSV=50000 l/Kg‧h之流速於700 ℃作活性反應對CH4和CO2之轉化率分別為63.9 % 和65.5 %。
之後本研究以添加其他元素或擔體的方式作LaNiO3觸媒之改質，製備出LaNiyMg1-yO3，LaxCa1-xNiO3，LaxCa1-xNiyMn1-yO3，LaxCe1-xNiyCo1-yO3，LaNiO3/MgO，LaNiO3/γ-Al2O3，LaNiO3/α-Al2O3七組觸媒並作活性測試，結果顯示其中之LaNiO3/α-Al2O3觸媒活性最佳，此粉末以GHSV=50000 l/Kg‧h之流速於700 ℃作活性反應對CH4和CO2轉化率分別為57.7 % 和76.7 %。
本研究再以改變煆燒條件的方法檢討LaNiO3觸媒之活性，結果以350 ℃持溫0.5小時後再以700 ℃煆燒2小時之LaNiO3觸媒具最佳之活性表現，該觸媒之比表面積值為7.14 m2/g，粒徑約為116 nm，此觸媒以GHSV=50000 l/Kg‧h之流速於700 ℃下反應1小時對CH4和CO2之轉化率分別為80.5 % 和81.3 %，但此反應亦伴隨積碳現象之產生，導致反應1小時後管線即因阻塞而終止反應。
最後本研究以相同之煆燒條件製備LaNiO3/α-Al2O3觸媒，檢討LaNiO3擔載量與LaNiO3/α-Al2O3用量對反應活性之影響，結果以5 wt% LaNiO3/α-Al2O3之觸媒0.15 g，其反應活性最佳且較不積碳，擔載在α-Al2O3上之LaNiO3觸媒粒徑大小約為10 ~ 30 nm，此觸媒以GHSV=20000 l/Kg‧h之流速於700 ℃下反應1小時對CH4和CO2之轉化率分別為61.7 % 和81.4 %，在穩定性測試方面可在700 ℃下反應8小時仍維持其催化活性。

The CH4 reforming of CO2 reaction could transform the greenhouse gas (CH4 and CO2) to synthesis gas (CO and H2). The synthesis gas could be used to produce methanol, liquid fuel and so on. To enhance the activity and stability of the LaNiO3 catalyst used in this reforming reaction, the catalyst was prepared by the citrate method and promoted by adding other elements or supports, or changing the calcination parameters.
The LaNiO3 phase was formed at 600 ℃ initially from the precursor prepared by the citrate method. The specific surface area and particle size of LaNiO3 were 6.37 m2/g and about 130 nm respectively when the precursor calcined at 700 ℃ for 2 h, and the conversion of CH4 and CO2 were 63.9 % and 65.5 % respectively when reacted at 700 ℃ and GHSV=50000 l/Kg‧h.
The LaNiO3 catalyst was promoted by adding other elements or supports. Seven new catalysts; LaNiyMg1-yO3, LaxCa1-xNiO3, LaxCa1-xNiyMn1-yO3, LaxCe1-xNiyCo1-yO3, LaNiO3/MgO, LaNiO3/γ-Al2O3, LaNiO3/α-Al2O3, were prepared and tested. The LaNiO3/α-Al2O3 catalyst had the best activity, the conversion of CH4 and CO2 were 57.7 % and 76.7 % respectively when reacted at 700 ℃ and GHSV=50000 l/Kg‧h.
The LaNiO3 catalyst was then promoted by changing the calcination parameters. The LaNiO3 catalyst formed from the precursor pre-heated at 350 ℃ for 0.5 h and then calcined at 700 ℃ for 2 h showed the best activity. The specific surface area and particle size of the catalyst were 7.14 m2/g and about 116 nm respectively. And the conversion of CH4 and CO2 were 80.5 % and 81.3 % respectively when reacted at 700 ℃ for 1 h and GHSV=50000 l/Kg‧h. But the reaction was ceased after 1 h of reaction by lots amount of coke formation.
The LaNiO3/α-Al2O3 catalyst was prepared by the same calcinations parameters with LaNiO3 catalyst, and the LaNiO3 loading amount and LaNiO3/α-Al2O3 catalyst using amount had been searched. The 5wt% LaNiO3/α-Al2O3 catalyst 0.15 g had the best activity and little coke formation, the particle size of LaNiO3 loading on α-Al2O3 was about 10 ~ 30 nm. The conversion of CH4 and CO2 were 61.7 % and 81.4 % respectively when reacted at 700 ℃ for 1 h and GHSV=20000 l/Kg‧h, and it could still maintained its activity (stability) after reaction at 700 ℃ for 8 h.

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