A series of K-MgAlO catalysts were synthesized by coprecipitation and impregnation methods. The K-MgAlO catalysts were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), and Fourier transform infrared (FT-IR) spectroscopy. The catalytic activity of K-MgAlO for simulation diesel engine exhaust gas was tested by the temperature programmed. The results showed that K existed on the surface of MgAlO in highly dispersed form when it is doped by 7%. The conversion rates of NO, CO, and C3H6 using the K-MgAlO catalyst reached 80% at the temperatures of 343, 335, and 298℃, respectively. The ignition temperature of soot was reduced from 380 to 253℃. All the results indicate that the four-way catalytic effect of MgAlO doped by K is stronger than that of the MgAlO catalyst.
ZHANG Junwu
,
YANG Li
,
ZHANG Yuxiu
,
SHU Xinqian
,
DENG Zengshe
. Four-way catalytic performance of MgAlO doped by K[J]. Journal of University of Chinese Academy of Sciences, 2018
, 35(3)
: 308
-313
.
DOI: 10.7523/j.issn.2095-6134.2018.03.004
[1] 欧阳明高. 控制汽车污染发展清洁汽车[J]. 群言, 2014(6):29-30.
[2] 刘志明,郝郑平,沈迪新,等. 柴油机排放碳颗粒物和NOx催化净化技术的研究进展[J]. 环境污染治理技术与设备,2000(5):78-86.
[3] 朱昌权, 梁红, 李树华,等. 同时去除碳烟颗粒物和氮氧化物催化剂研究进展[J]. 工业催化, 2011, 19(5):1-7.
[4] 路良泽, 代方方, 孟明. 负载钙钛矿型催化剂的制备、结构及其对碳烟的催化燃烧性能[J]. 科学通报, 2014,59(26):2609-2614.
[5] 刘焕荣. MnCo_2O_4尖晶石型复合氧化物的制备及其应用研究[D]. 青岛:中国石油大学(华东), 2011.
[6] 李倩. Co、Mn水滑石基复合氧化物催化剂上碳烟和NOx的催化消除[D]. 天津:天津大学,2010.
[7] 邓欣, 方真, 张帆,等. 纳米水滑石的制备、特性及应用[J]. 材料导报, 2010, 24(s2):35-39.
[8] 孙璠, 李泽龙, 刘蒲,等. 镁铝复合金属氧化物负载纳米Pd催化剂的制备及其在醇胺一步合成亚胺反应中的应用[J]. 分子催化, 2014, 28(5):410-417.
[9] Goh K H, Lim T T, Dong Z. Application of layered double hydroxides for removal of oxyanions:a review[J]. Water Research, 2008, 42(6/7):1343-1368.
[10] 张成红. 镁铝水滑石PVC热稳定剂的合成研究[D]. 北京:北京化工大学, 2015.
[11] 鲁志敏. 丙烷脱氢制丙烯Pt-Sn/Mg-Al-O催化剂的制备及性能研究[D]. 北京:北京化工大学, 2015.
[12] Zhang Z, Mou Z, Yu P, et al. Diesel soot combustion on potassium promoted hydrotalcite-based mixed oxide catalysts[J]. Catalysis Communications, 2007, 8(11):1621-1624.
[13] Zhang Z, Zhang Y, Su Q, et al. Determination of intermediates and mechanism for soot combustion with NOx/O2 on potassium-supported Mg-Al hydrotalcite mixed oxides by in situ FTIR.[J]. Environmental Science & Technology, 2010, 44(21):8254-8258.
[14] 段明杰. 水滑石的制备及其对N2O分解的催化性能研究[D]. 北京:北京化工大学, 2013.
[15] 李爽, 史翊翔, 杨懿,等. 钾修饰水滑石吸附剂脱碳性能及颗粒强度实验研究[J]. 工程热物理学报, 2015(7):1606-1610.
[16] Iordan A, Zaki M I, Kappenstein C. Interfacial chemistry in the preparation of catalytic potassium-modified aluminas[J]. Journal of the Chemical Society, Faraday Transactions, 1993, 89(14):2527-2536.
[17] Kantschewa M, Albano E V, Etrtl G, et al. Infrared and X-ray photoelectron spectroscopy study of K2CO3/γ-Al2O3[J]. Applied Catalysis, 1983, 8(1):71-84.
[18] 张业新, 苏庆运, 王仲鹏,等. 钾对镁铝水滑石复合氧化物的表面改性[J]. 物理化学学报, 2010, 26(4):921-926.
[19] 吉鸿飞. 镁铝型类水滑石的制备及其对水中氟和重金属离子的去除性能研究[D]. 西安:长安大学, 2012.
[20] 张业新. 柴油车尾气四效催化剂的研究[D]. 大连:大连理工大学, 2012.
[21] Mul G, Kapteijn F, Moulijn J A. Catalytic oxidation of model soot by metal chlorides[J]. Applied Catalysis B Environmental, 1997, 12(1):33-47.
