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Vật liệu hút khí dựa trên perovskite làm từ phương pháp sol-gel cho quá trình tách khí ở nhiệt độ cao
Tóm tắt
Trong nghiên cứu này, việc thay thế một phần hoặc doping SrCo0.8Fe0.2O3-δ (SCF) dẫn đến sự hình thành các hợp chất La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) và La0.6Sr0.4Co0.2Ni0.8O3-δ (LSCNi) đã được thực hiện thông qua kỹ thuật sol-gel Pechini. Các oxit perovskite đã được nung ở nhiệt độ 850 °C trong 4 giờ và các đặc trưng về cấu trúc tinh thể, hình thái và hành vi hấp thụ/phát thải oxy của chúng đã được so sánh hệ thống. Kết quả cho thấy các oxit perovskite tổng hợp được thể hiện dạng perovskite lập phương đơn pha. Phân tích O2-TPD cho thấy LSCNi hấp thụ một lượng oxy lớn nhất, trong khi SCF chỉ hoạt động tốt hơn ở nhiệt độ vận hành cao hơn. Từ thử nghiệm trên giường cố định, LSCF và LSCNi được tìm thấy có tiềm năng cao trong việc sử dụng làm vật liệu hấp thụ oxy cho quá trình tách khí ở nhiệt độ cao vì chúng cần ít thời gian hơn để đạt được đường cong bứt phá.
Từ khóa
#perovskite #sol-gel #tách khí #hấp thụ oxy #độ tinh khiết caoTài liệu tham khảo
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