JP2023514029A - 高い活性及び長期安定性を有するco2メタン化反応のための触媒、並びにその方法 - Google Patents
高い活性及び長期安定性を有するco2メタン化反応のための触媒、並びにその方法 Download PDFInfo
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Abstract
Description
総括反応
(i)逆水性ガスシフト(Reverse water-gas-shift:RWGS)
工程1)硝酸ニッケル、硝酸鉄、及び硝酸セシウムを、硝酸セリウム及び硝酸アルミニウムの水溶液混合物へと、連続撹拌速度及び363Kの温度において、滴加する工程と、
工程2)同時に、Na2CO3を工程(1)の溶液へと滴加し、2M NaOH溶液の添加によってアルカリ性pHを9~10に維持する工程と、
工程3)水熱処理のために、テフロン(登録商標)ライニングボンベ(Teflon lining bomb)反応器(圧力容器)中において443Kで24時間、反応混合物を沈殿させる工程と、
工程4)溶液を室温まで冷却し、沈殿物を濾過によって分離する工程と、
工程5)脱イオン水で沈殿物を数回洗浄して、中性pHを達成する工程と、
工程6)沈殿物を383Kで12時間乾燥させる工程と、
工程7)空気雰囲気において、温度973Kで5時間、乾燥沈殿物をか焼させる工程と、
を含む、方法を提供する。
新規のアルカリ助触媒混合金属酸化物、すなわちCs助触媒Ni-Fe/CeO2-Al2O3[Cs-Ni-Fe/CeO2-γAl2O3]を含む例1で調製した触媒を、CO2メタン化反応に使用した。
炭素収支を以下のように定義した:
Claims (7)
- 高い活性及び長期安定性(1000時間超)を有する選択的二酸化炭素メタン化反応のための不均一触媒であって、前記触媒が、以下:
-少なくとも1種のアルカリ助触媒金属と、
-2種の活性金属と、
-CeO2-γAl2O3の組合せを有する活性金属の担体と、からなり;
触媒が、200~800(m2/g)の表面積、0.5~2.5(cm3/g)の細孔容積、及び5~30nmの間の平均細孔直径を有するように、合成され、特徴づけられた、
不均一触媒。 - 前記アルカリ助触媒金属が、セシウムである、請求項1に記載の選択的二酸化炭素メタン化反応のための不均一触媒。
- 前記アルカリ助触媒金属の濃度が、前記担体の総重量を基準として、1~5重量%である、請求項1に記載の選択的二酸化炭素メタン化反応のための不均一触媒。
- 前記活性金属が、ニッケル及び鉄である組合せで選択される、請求項1に記載の選択的二酸化炭素メタン化反応のための不均一触媒。
- 前記活性金属の濃度が、前記担体の組合せの総重量を基準として、5~20重量%である、請求項1に記載の選択的二酸化炭素メタン化反応のための不均一触媒。
- 前記担体の組合せ、すなわちCeO2-γAl2O3のモル比が、3:2として選択される、請求項1に記載の選択的二酸化炭素メタン化反応のための不均一触媒。
- 請求項1に記載の選択的二酸化炭素メタン化反応のための不均一触媒の調製方法が、水熱共沈殿法から選択される方法であって、以下の工程:
工程1)硝酸ニッケル、硝酸鉄、及び硝酸セシウムを、硝酸セリウム及び硝酸アルミニウムの水溶液混合物へと、連続撹拌速度及び363Kの温度において、滴加する工程と、
工程2)同時に、Na2CO3を前記工程(1)の溶液へと滴加し、2M NaOH溶液の添加によってアルカリ性pHを9~10に維持する工程と、
工程3)水熱処理のために、テフロンライニングボンベ(Teflon lining bomb)反応器(圧力容器)中において443Kで24時間、前記反応混合物を沈殿させる工程と、
工程4)前記溶液を室温まで冷却し、沈殿物を濾過によって分離する工程と、
工程5)脱イオン水で沈殿物を数回洗浄して、中性pHを達成する工程と、
工程6)沈殿物を383Kで12時間乾燥させる工程と、
工程7)空気雰囲気において、温度973Kで5時間、乾燥沈殿物をか焼させる工程と、
を含む、方法。
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