高效介孔Co_3O_4/CeO_2-Al_2O_3低温催化氧化甲醛性能研究
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摘要
以介孔CeO_2-Al_2O_3为载体,采用浸渍法制备了系列介孔Co_3O_4/CeO_2-Al_2O_3催化剂,该系列催化剂对甲醛的低温催化氧化反应有显著的催化效果。考察了催化剂中Co_3O_4的质量分数对催化剂的催化性能的影响。实验结果表明,当Co_3O_4的质量分数为8%时,催化剂在60℃使甲醛完全氧化为CO_2和H_2O。同时,对样品进行了程序升温还原(H_2-TPR)表征,发现介孔8%Co_3O_4/CeO_2-Al_2O_3催化剂具有较强的还原能力。
A series of mesoporous Co_3O_4/CeO_2-Al_2O_3 catalysts with different loading amounts of Co_3O_4 were prepared by wet impregnation method and tested for catalytic oxidation of formaldehyde(HCHO). Effect of Co_3O_4 loading amount on the catalytic performance was investigated. The results showed that, when loading amount of Co_3O_4 was 8%, formaldehyde was completely oxidized to CO_2 and H_2 O at 60 ℃over the catalyst. And the samples were characterized by H_2-TPR. It's found that the mesoporous 8%Co_3O_4/CeO_2-Al_2O_3 catalyst has strong reducibility.
A series of mesoporous Co_3O_4/CeO_2-Al_2O_3 catalysts with different loading amounts of Co_3O_4 were prepared by wet impregnation method and tested for catalytic oxidation of formaldehyde(HCHO). Effect of Co_3O_4 loading amount on the catalytic performance was investigated. The results showed that, when loading amount of Co_3O_4 was 8%, formaldehyde was completely oxidized to CO_2 and H_2 O at 60 ℃over the catalyst. And the samples were characterized by H_2-TPR. It's found that the mesoporous 8%Co_3O_4/CeO_2-Al_2O_3 catalyst has strong reducibility.
引文
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[2]张长斌.室内空气污染物催化氧化研究[J].环境化学,2015,34:817-823.
[3]陈莹,贺军辉,杨巧文.净化甲醛纳米催化剂的固载及改性研究进展[J].化学通报,2013,76:878-887.
[4]Cui W Y,Xue D,Yuan X L,et al.Acid-treated Ti O2 nanobelt supported platinum nanoparticles for the catalytic oxidation of formaldehyde at ambient conditions[J].Applied Surface Science,2017,411:105-112.
[5]Li D D,Yang G L,Li P L,et al.Promotion of formaldehyde oxidation over Ag catalyst by Fe doped Mn Ox support at room temperature[J].Catalysis Today,2016,277:257-265.
[6]梁凯,崔亚军,崔久涛,等.催化燃烧技术处理石油化工企业含VOCs废气的工艺研究[J].当代化工,2017,46:707-710.
[7]Colussi S,Boaro M,Rogatis L D,et al.Room temperature oxidation of formaldehyde on Pt-based catalysts:A comparison between ceria and other supports(Ti O2,Al2O3 and Zr O2)[J].Catalysis Today,2015,253:163-171.
[8]Li H F,Zhang N,Chen P,et al.High surface area Au/Ce O2 catalysts for low temperature formaldehyde oxidation[J].Applied Catalysis B:Environmental,2011,110:279-285.
[9]Zhang C B,Li Y B,Wang Y F,et al.Sodium-promoted Pd/Ti O2 for catalytic oxidation of formaldehyde at ambient temperature[J].Environmental Science&Technology,2014,48:5816-5822.
[10]Nie L H,Yu J G,Li X Y,et al.Enhanced performance of Na OHmodified Pt/Ti O2 toward room temperature selective oxidation of formaldehyde[J].Environmental Science&Thechnology,2013,47:2777-2783.
[11]Li Y B,Zhang C B,He H.Significant enhancement in activity of Pd/Ti O2 catalyst for formaldehyde oxidation by Na addition[J].Catalysis Today,2017,281:412-417.
[12]Bai B Y,Arandiyan H,Li J H.Comparison of the performance for oxidation of formaldehyde onnano-Co3O4,2D-Co3O4,and 3D-Co3O4catalysts[J].Applied Catalysis B:Environmental,2013,142-143:677-683.
[13]Bai B Y,Qiao Q,Li J H,et al.Synthesis of three-dimensional ordered mesoporous Mn O2 and its catalytic performance in formaldehyde oxidation[J].Chinese Journal of Catalysis,2016,37:27-31.
[14]Zheng Y L,Wang W Z,Jiang D,et al.Amorphous Mn Ox modified Co3O4 for formaldehyde oxidation:improved low-temperature catalytic and photothermocatalytic activity[J].Chemical Engineering Journal,2016,284:21-27.
[15]Wang J L,Li J G,Jing C J,et al.The effect of manganese vacancy in birnessite-type Mn O2 on room-temperature oxidation of formaldehyde in air[J].Applied Catalysis B:Environmental,2017204:147-155.
[16]IUPAC manual of symbols and terminology[J].Pure and Applied Chemistry,1972,31:578-638.
[17]Ma L,Wang D S,Li J H,et al.Ag/Ce O2 nanospheres:Efficient catalysts for formaldehyde oxidation[J].Applied Catalysis B:Environmental,2014,148-149:36-43.
[18]Carvalho F L S,Asencios Y J O,Bellido J D.A,et al.Bio-ethanol steam reforming for hydrogen production over Co3O4/Ce O2 catalysts synthesized by one-step polymerization method[J].Fuel Processing Technology,2016,142:182-191.
[19]Akram S,Wang Z,Wang Q,et al.Low-temperature efficient degradation of ethyl acetate catalyzed by latticedoped Ce O2-Co Oxnanocomposites[J].Catalysis Communications,2016,73:123-127.