载体热处理温度对Pt/FeO_x催化甲醛氧化性能的影响
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摘要
将Fe(OH)3以不同温度(T)热处理得到载体FeO_x-T,采用胶体沉积法制备了一系列Pt/FeO_x-T催化剂用于甲醛室温催化氧化反应。通过XRD、BET、H_2-TPR、FTIR和TEM对Pt/FeO_x-T催化剂的结构进行了表征。结果表明:热处理温度影响FeO_x载体的比表面积、氧化还原性质和Pt/FeO_x-T表面羟基的数量,以及Pt物种和FeO_x载体之间的相互作用。活性测试结果表明:以100℃热处理的FeO_x为载体,制备的Pt质量分数为1.5%的Pt/FeO_x-100催化剂具有较高的催化活性,在25℃、相对湿度(RH)55%的条件下,甲醛的转化率可达到96.2%。
A series of FeO_x-T supports were prepared by thermal treatment at different temperatures, and then FeO_x-T supported Pt(Pt/FeO_x-T) catalysts were prepared by a facile colloid deposition method. Their catalytic properties were investigated in the oxidation of formaldehyde at ambient temperature. These catalysts were characterized by XRD, BET, H_2-TPR, FTIR and TEM. The results showed the thermal treatment temperature could affect the BET surface area and oxidation-reduction property of FeO_x, the amount of surface hydroxyl groups of Pt/FeO_x-T, and the interaction between Pt species and FeO_x. The results indicated that when FeO_x was thermally treated at 100 ℃, the prepared Pt/FeO_x-100 catalyst with a Pt loading of 1.5 wt% had high catalytic activity. The conversion of formaldehyde over this Pt/FeO_x-100 could reach 96.2% at a relative humidity(RH) of 55% and ambient temperature(25 ℃).
A series of FeO_x-T supports were prepared by thermal treatment at different temperatures, and then FeO_x-T supported Pt(Pt/FeO_x-T) catalysts were prepared by a facile colloid deposition method. Their catalytic properties were investigated in the oxidation of formaldehyde at ambient temperature. These catalysts were characterized by XRD, BET, H_2-TPR, FTIR and TEM. The results showed the thermal treatment temperature could affect the BET surface area and oxidation-reduction property of FeO_x, the amount of surface hydroxyl groups of Pt/FeO_x-T, and the interaction between Pt species and FeO_x. The results indicated that when FeO_x was thermally treated at 100 ℃, the prepared Pt/FeO_x-100 catalyst with a Pt loading of 1.5 wt% had high catalytic activity. The conversion of formaldehyde over this Pt/FeO_x-100 could reach 96.2% at a relative humidity(RH) of 55% and ambient temperature(25 ℃).
引文
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[35]Chen B B,Zhu C B,Crocker M,et al.Complete oxidation of formaldehyde at ambient temperature overγ-Al2O3 supported Au catalyst[J].Catalysis Communications,2013,42(42):93-97.
[2]Tang X J,Bai Y,Duong A,et al.Formaldehyde in China:Production,consumption,exposure levels,and health effects[J].Environment International,2009,35(8):1210-1224.
[3]Zheng Y X,Ding H,Luo H N,et al.Adsorption properties of formaldehyde by organic modified zeolite[J].Advanced Materials Research,2012,581-582(1):277-282.
[4]Lu N,Pei J J,Zhao Y X,et al.Performance of a biological degradation method for indoor formaldehyde removal[J].Building and Environment,2012,57(57):253-258.
[5]Liang W J,Li J,Li J X,et al.Formaldehyde removal from gas streams by means of NaNO2 dielectric barrier discharge plasma[J].Journal of Hazardous Materials,2010,175(1-3):1090-1095.
[6]Kibanova D,Sleiman M,Cervinisilva J,et al.Adsorption and photocatalytic oxidation of formaldehyde on a clay-TiO2 composite[J].Journal of Hazardous Materials,2003,99(2):233-239.
[7]Quiroz T J,Royer S,Bellat J P,et al.Formaldehyde:Catalytic oxidation as a promising soft way of elimination[J].Chem Sus Chem,2013,6(4):578-592.
[8]Nie L H,Yu J G,Jaroniec M,et al.Room-temperature catalytic oxidation of formaldehyde on catalysts[J].Catalysis Science&Technology,2016,6(11):3649-3669.
[9]Bai B Y,Qiao Q,Li J H,et al.Progress in research on catalysts for catalytic oxidation of formaldehyde[J].Chinese Journal of Catalysis,2016,37(1):102-122.
[10]Zhang J H,Li Y B,Wang L,et al.Catalytic oxidation of formaldehyde over manganese oxides with different crystal structures[J].Catalysis Science Technology,2015,5(4):2305-2313.
[11]Quiron J,Giraudon J M,Gerasini A,et al.Total oxidation of formaldehyde over MnOx-CeO2 catalysts:The effect of acid treatment[J].ACS Catalysis,2015,5:2260-2269.
[12]Fan Z Y,Zhang Z X,Fang W J,et al.Low-temperature catalytic oxidation of formaldehyde over Co3O4 catalysts prepared using various precipitants[J].Chinese Journal of Catalysis,2016,37(6):947-954.
[13]Huang Y C,Fan W J,Long B,et al.Alkali-modified non-precious metal 3D-NiCo2O4 nanosheets for efficient formaldehyde oxidation atlow temperature[J].Journal of Materials Chemistry A,2016,4(10):3648-3654.
[14]Xu Q L,Lei W Y,Li X Y,et al.Efficient removal of formaldehyde by nanosized gold on well-defined CeO2 nanorods at room temperature[J].Environmental Science&Technology,2014,48(16):9702-9708.
[15]Zhang C B,Liu F D,Zhai Y P,et al.Alkali-metal-promoted Pt/TiO2opens a more efficient pathway to formaldehyde oxidation at ambient temperatures[J].Angewandte Chemie-International Edition,2012,51(38):9628-9632.
[16]Zhang C B,Li Y B,WangY F,et al.Sodium-promoted Pd/TiO2 for catalytic oxidation of formaldehydeat ambient temperature[J].Environmental Science&Technology,2014,48(10):5816-5822.
[17]Zhang J H,Li Y B,Zhang Y,et al.Effect of support on the activity of Ag-based catalysts for formaldehyde oxidation[J].Scientific Reports,2015,12950:1-10.
[18]An N H,Yu Q S,Liu G,et al.Complete oxidation of formaldehyde at ambient temperature over supported Pt/Fe2O3 catalysts prepared by colloid-deposition method[J].Journal of Hazardous Materials,2011,186(2/3):1392-1397.
[19]Nie L H,Meng A Y,Yu J G,et al.Hierarchically macro-mesoporous Pt/Al2O3 composite microspheres for efficient formaldehyde oxidation at room temperature[J].Scientific Reports,2013,3215:1-7.
[20]Nie L H,Meng A Y,Teng F,et al.Hierarchically macro-mesoporous flowerlike Pt/NiO composite microspheres for efficient formaldehyde oxidation at room temperature[J].RSC Advances,2015,5:83997-84003.
[21]Liu L Q,Zhou F,Wang L G,et al.Low-temperature CO oxidation over supported Pt,Pd catalysts:particular role of FeOx support for oxygen supply during reactions[J].Journal of Catalysis,2010,274(1):1-10.
[22]Nagai Y,Hirabayashi T,Dohmae K,et al.Sintering inhibition mechanism of platinum supported on ceria-based oxide and Ptoxide-support interaction[J].Journal of Catalysis,2006,242(1):103-109.
[23]Ferreira A P,Zanchet D,Araújo J C S,et al.The effects of CeO2 on the activity and stability of Pt supported catalysts for methane reforming,as addressed by in situ temperature resolved XAFS and TEM analysis[J].Journal of Catalysis,2009,263(2):335-344.
[24]LiS Y,Liu G,Lian H L,et al.Low-temperature CO oxidation over supported Pt catalysts prepared by colloid-deposition method[J].Catalysis Communications,2008,9(6):1045-1049.
[25]Zheng B,Liu G,Geng L L et al.Role of the FeOx support in constructing high-performance Pt/FeOx catalysts for low-temperature CO oxidation[J].Catalysis Science Technology,2016,6(5):1546-1554.
[26]Qi L F,Cheng B,Yu J G,et al.High-surface area mesoporous Pt/TiO2hollow chains for efficient formaldehyde composition at ambient temperature[J].Journal of Hazardous Materials,2016,301:522-530.
[27]Yan Z X,Xu Z H,Yu J G,et al.Highly active mesoporous ferrihydrite supported Pt catalyst for formaldehyde removal at room temperature[J].Environmental Science Technology,2015,49(11):6637-6644.
[28]Qiao B T,Wang A Q,Li L,et al.Ferric oxide-supported Pt subnanoclusters for preferential oxidation of CO in H2-rich gas at room temperature[J].Acs Catalysis,2014,4(7):2113-2117.
[29]An N H,Li S Y,Duchesne P N,et al.Size effects of platinum colloid particles on the structure and CO oxidation properties of supported Pt/Fe2O3 catalysts[J].Journal of Physical Chemistry C,2013,117(41):21254-21262.
[30]Jambor J L,Dutrizac J E.Occurrence and constitution of natural and synthetic ferrihydrite,a widespread iron oxyhydroxide[J].Chemical Reviews,1998,98(7):2549-2585.
[31]Parker S F,The role of hydroxyl groups in low temperature carbon monoxide oxidation[J].Chemical Communications,2011,47(7):1988-1990.
[32]Chen B B,Zhu X B,Crocker M,et al.FeOx-supported gold catalysts for catalytic removal of formaldehyde at room temperature[J].Applied Catalysis B:Environmental,2014,154/155(1):73-81.
[33]Chen G X,Zhao Y,Fu G,et al.Interfacial effects in iron-nickel hydroxide-platinum nanoparticles enhance catalytic oxidation[J].Science,2014,344:495-499.
[34]Dong W K,Seo P W,Kim G J,et al.Characteristics of the HCHOoxidation reaction over Pt/TiO2 catalysts at room temperature:The effect of relative humidity on catalytic activity[J].Applied Catalysis B:Environmental,2015,163:436-443.
[35]Chen B B,Zhu C B,Crocker M,et al.Complete oxidation of formaldehyde at ambient temperature overγ-Al2O3 supported Au catalyst[J].Catalysis Communications,2013,42(42):93-97.