铈改性ZIF-8材料催化降解甲苯的性能研究
|
摘要
文章利用水热法合成不同比例铈改性ZIF-8催化剂,研究其在催化降解甲苯反应中的催化活性,从而筛选出最佳铈锌比例的复合催化剂,并采用场发射扫描电镜(FE-SEM)、X-射线衍射仪(XRD)、热重分析(TG)及低温氮气吸附技术对催化剂进行表征。结果表明:铈改性ZIF-8催化剂表面分散的铈显著提高了ZIF-8的甲苯催化氧化活性,Ce∶Zn(摩尔比)=0.6∶0.4时催化剂的活性最高,甲苯转化率达90%时的温度为247℃。材料表征结果表明,合成催化剂颗粒尺寸不均一,热稳定性良好。
A series of Ce-ZIF-8 composites were prepared by a hydrothermal synthesis method using different mole ratios of Ce and Zn for the catalytic oxidation of toluene. The prepared catalysts were characterized by field emission scanning electron microscopy(FE-SEM), X-ray diffraction(XRD), thermogravimetry(TG) and low-temperature N_2 sorption. The results revealed that the catalytic activity of ZIF-8 for toluene oxidation increased with the dispersion of Ce particles on the surface of ZIF-8. Ce_(0.6)Zn_(0.4) catalyst exhibited excellent catalytic performance in the catalytic combustion of toluene. The temperature of toluene conversion up to 90% was 247 ℃. The results of material characterizations showed that the size of catalyst particles was not uniform, but the thermal stability was good.
A series of Ce-ZIF-8 composites were prepared by a hydrothermal synthesis method using different mole ratios of Ce and Zn for the catalytic oxidation of toluene. The prepared catalysts were characterized by field emission scanning electron microscopy(FE-SEM), X-ray diffraction(XRD), thermogravimetry(TG) and low-temperature N_2 sorption. The results revealed that the catalytic activity of ZIF-8 for toluene oxidation increased with the dispersion of Ce particles on the surface of ZIF-8. Ce_(0.6)Zn_(0.4) catalyst exhibited excellent catalytic performance in the catalytic combustion of toluene. The temperature of toluene conversion up to 90% was 247 ℃. The results of material characterizations showed that the size of catalyst particles was not uniform, but the thermal stability was good.
引文
[1] Sang C K, Wang G S. Catalytic combustion of VOCs over a series of manganese oxide catalysts[J]. Applied Catalysis B:Environmental, 2010,98(3):180-185.
[2] Liotta L F. Catalytic oxidation of volatile organic compounds on supported noble metals[J]. Applied Catalysis B:Environmental, 2010,100(3):403-412.
[3] Delimaris D, Ioannides T. VOC oxidation over MnOx–CeO2,catalysts prepared by a combustion method[J]. Applied Catalysis B:Environmental, 2009,84(1):303-312.
[4] Zhang Z, Jiang Z, Shangguan W. Low-temperature catalysis for VOCs removal in technology and application:a stateof-the-art review[J]. Catalysis Today, 2016,264:270-278.
[5] Peng L, Chi H, Jie C, et al. Catalytic oxidation of toluene over Pd/Co3AlO catalysts derived from hydrotalcite-like compounds:effects of preparation methods[J]. Applied Catalysis B:Environmental, 2011,101(3/4):570-579.
[6] Shen Z, Li K, Su J, et al. Pd–Co based spinel oxides derived from Pd nanoparticles immobilized on layered double hydroxides for toluene combustion[J]. Applied Catalysis B:Environmental, 2016,181:236-248.
[7] Park K S, Ni Z, C?téA P, et al. From the cover:exceptional chemical and thermal stability of zeolitic imidazolate frameworks[J]. Proceedings of the National Academy of Sciences,2006,103(27):10186-10191.
[8]翟祥素.纳米级沸石咪唑酯骨架(ZIFs)材料的可控合成及表征[D].上海:华东理工大学, 2016.Zhai Xiangsu. Synthesis and Characterization of Nannoscale ZIFs with Well-controllable Structure[D]. Shanghai:East China University of Science and Technology, 2016.
[9]张爱国,贾俊,赵鑫,等.气相色谱法研究测定金属有机骨架材料ZIF-8的甲醛吸附性能[J].化工设计通讯, 2017,43(10):68.Zhang Aiguo, Jia Jun, Zhao Xin, et al. Determination of formaldehyde adsorption properties of metal organic matrix material ZIF-8 by gas chromatography[J]. Chimical Engineering Design Communications, 2017,43(10):68.
[10] Chandra R, Mukhopadhyay S, Nath M. TiO2@ZIF-8:a novel approach of modifying micro-environment for enhanced photo-catalytic dye degradation and high usability of TiO2,nanoparticles[J]. Materials Letters, 2016,164:571-574.
[11] Liao Y, He L, Zhao M, et al. Ultrasonic-assisted hydrothermal synthesis of ceria nanorods and their catalytic properties for toluene oxidation[J]. Journal of Environmental Chemical Engineering, 2017,5:5054-5060.
[12] Liao Y, He L, Man C, et al. Diameter-dependent catalytic activity of ceria nanorods with various aspect ratios for toluene[J]. Chemical Engineering Journal, 2014,256:439-447.
[13] Li Z, Gao Y, Wu J, et al. Synthesis and electrochemical characterization of Ni-B/ZIF-8 as electrode materials for supercapacitors[J]. Electronic Materials Letters, 2016,12(5):645-650.
[14] Nordin N A H M, Ismail A F, Mustafa A, et al. Aqueous room temperature synthesis of zeolitic imidazole framework8(ZIF-8)with various concentrations of triethylamine[J].RSC Advances, 2014,4:33292-33300.
[2] Liotta L F. Catalytic oxidation of volatile organic compounds on supported noble metals[J]. Applied Catalysis B:Environmental, 2010,100(3):403-412.
[3] Delimaris D, Ioannides T. VOC oxidation over MnOx–CeO2,catalysts prepared by a combustion method[J]. Applied Catalysis B:Environmental, 2009,84(1):303-312.
[4] Zhang Z, Jiang Z, Shangguan W. Low-temperature catalysis for VOCs removal in technology and application:a stateof-the-art review[J]. Catalysis Today, 2016,264:270-278.
[5] Peng L, Chi H, Jie C, et al. Catalytic oxidation of toluene over Pd/Co3AlO catalysts derived from hydrotalcite-like compounds:effects of preparation methods[J]. Applied Catalysis B:Environmental, 2011,101(3/4):570-579.
[6] Shen Z, Li K, Su J, et al. Pd–Co based spinel oxides derived from Pd nanoparticles immobilized on layered double hydroxides for toluene combustion[J]. Applied Catalysis B:Environmental, 2016,181:236-248.
[7] Park K S, Ni Z, C?téA P, et al. From the cover:exceptional chemical and thermal stability of zeolitic imidazolate frameworks[J]. Proceedings of the National Academy of Sciences,2006,103(27):10186-10191.
[8]翟祥素.纳米级沸石咪唑酯骨架(ZIFs)材料的可控合成及表征[D].上海:华东理工大学, 2016.Zhai Xiangsu. Synthesis and Characterization of Nannoscale ZIFs with Well-controllable Structure[D]. Shanghai:East China University of Science and Technology, 2016.
[9]张爱国,贾俊,赵鑫,等.气相色谱法研究测定金属有机骨架材料ZIF-8的甲醛吸附性能[J].化工设计通讯, 2017,43(10):68.Zhang Aiguo, Jia Jun, Zhao Xin, et al. Determination of formaldehyde adsorption properties of metal organic matrix material ZIF-8 by gas chromatography[J]. Chimical Engineering Design Communications, 2017,43(10):68.
[10] Chandra R, Mukhopadhyay S, Nath M. TiO2@ZIF-8:a novel approach of modifying micro-environment for enhanced photo-catalytic dye degradation and high usability of TiO2,nanoparticles[J]. Materials Letters, 2016,164:571-574.
[11] Liao Y, He L, Zhao M, et al. Ultrasonic-assisted hydrothermal synthesis of ceria nanorods and their catalytic properties for toluene oxidation[J]. Journal of Environmental Chemical Engineering, 2017,5:5054-5060.
[12] Liao Y, He L, Man C, et al. Diameter-dependent catalytic activity of ceria nanorods with various aspect ratios for toluene[J]. Chemical Engineering Journal, 2014,256:439-447.
[13] Li Z, Gao Y, Wu J, et al. Synthesis and electrochemical characterization of Ni-B/ZIF-8 as electrode materials for supercapacitors[J]. Electronic Materials Letters, 2016,12(5):645-650.
[14] Nordin N A H M, Ismail A F, Mustafa A, et al. Aqueous room temperature synthesis of zeolitic imidazole framework8(ZIF-8)with various concentrations of triethylamine[J].RSC Advances, 2014,4:33292-33300.