Co取代的六铁酸盐在N_2O催化分解反应中的应用(英文)

Catalytic decomposition of N_2O on cobalt substituted barium hexaferrites

采用溶胶-凝胶法制备了Co取代的Ba2Mg2-xCoxFe12O22（x=0.0-2.0）催化剂,并考察了其在高浓度N2O（30vol%）分解反应中的催化活性.结果表明,Co的取代显著提高了Ba2Mg2Fe12O22催化剂活性,当x=2时,N2O的完全分解温度从1123K降至973K;提高催化剂焙烧温度会导致其表面积降低,进而降低其催化活性;但采用微波加热则能显著提高催化剂活性.

Catalytic decomposition of N2O was studied over Co substituted Mg‐Y type hexaferrites （Ba2Mg2‐xCoxFe12O22, x=0.4–2.0）. The materials were synthesized by a sol‐gel method using citric acid as the chelator followed by calcination at 1223 K for 5 h. X‐ray diffraction, thermogravimetric analysis/derivative thermogravimetric, scanning electron microscopy, and N 2 adsorption techniques were used to confirm the formation of hexaferrite. The Ba2Mg2‐xCoxFe12O22 catalysts displayed good activity for decomposition of high concentration N2O（30 vol%）, and complete substitution of Mg for Co lowered the complete conversion temperature from 1123 K to 973 K. Increasing calcination temperature suppressed the catalytic activity by deteriorating surface area. Moreover, coupling microwave discharge significantly boosted the catalytic activity. Co substituted Mg‐Y type hexaferrites are potentially active and thermally stable to be used as catalyst for high concentration N2O decomposition.