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Tổng hợp và đặc trưng của chất xúc tác alumina pha silica với độ ổn định nhiệt vượt trội và đặc điểm lỗ độc đáo
Tóm tắt
Đã phát triển một phương pháp tổng hợp đơn giản, thiếu dung môi, một bước để tạo ra alumina pha silica có độ bền nhiệt cao, với diện tích bề mặt lớn, thể tích lỗ lớn và lỗ lớn độc đáo. Alumina pha silica (SDA) được tổng hợp bằng cách thêm 5% khối lượng silica từ tetraethyl orthosilicate (TEOS) vào aluminum isoproxide (AIP), với tỷ lệ mol 1:5 giữa AIP và nước và tỷ lệ mol 1:2 giữa TEOS và nước mà không cần khuôn mẫu. Cấu trúc của alumina pha silica đã được nghiên cứu bằng XRD bột tại chỗ ở nhiệt độ cao, hấp phụ nitơ, phân tích nhiệt trọng lượng, NMR thể rắn và TEM. Việc thêm silica làm tăng đáng kể độ ổn định của pha γ-Al2O3 lên 1200 °C trong khi vẫn duy trì diện tích bề mặt lớn, thể tích lỗ lớn và đường kính lỗ lớn. Sau khi thiêu kết ở 1100 °C trong 2 giờ, quan sát thấy diện tích bề mặt đạt 160 m2/g, thể tích lỗ 0,99 cm3/g, và phân bố kích thước lỗ bimodal với 23 và 52 nm. So với alumina pha silica thương mại, sau khi thiêu kết trong 24 giờ ở 1100 °C, diện tích bề mặt, thể tích lỗ và đường kính lỗ của SDA lần lượt cao hơn 46%, 155% và 94%. Kết quả cho thấy rằng Si ổn định cấu trúc xốp của γ-Al2O3 lên đến 1200 °C, trong khi alumina không ổn định chỉ ổn định ở 900 °C. Từ dữ liệu của chúng tôi, chúng tôi suy luận rằng Si đi vào các vị trí khuyết tật tứ diện trong cấu trúc spinel của alumina mà không di chuyển nhôm ra khỏi các vị trí tứ diện và hình thành giao diện silica-alumina.
Từ khóa
#Silica-doped alumina #thermal stability #pore properties #one-pot synthesis #XRD #nitrogen adsorptionTài liệu tham khảo
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