摘要
为了开发高效稳定、具有低温活性的降解VOCs催化材料,采用传统水热法制备了一系列不同锰铈比的催化剂(MnO2、Mn0.95Ce0.05Ox、Mn0.90Ce0.10Ox、Mn0.80Ce0.20Ox及Mn0.60Ce0.40Ox),利用SEM、BET、XRD、H2-TPR、O2-TPD、拉曼光谱等技术对催化剂的物理化学性质进行了表征分析,同时考察了其对甲苯的催化氧化活性。结果表明:通过简单的水热合成法合成出的Mn-Ce复合氧化物均为微球,但Ce的加入使得微球催化剂表面的纳米针消失,变为光滑的微球体;而不同的催化剂在氧化甲苯时呈现不同的催化氧化性能,其中Mn0.80Ce0.20Ox具有最佳的甲苯氧化性能,这是由于其具有较强的氧化还原性能、较高的化学吸附氧含量及存在Mn-Ce固溶体。因此,通过控制催化剂中Ce含量,可调控催化剂的形貌和物理化学特性,从而使Mn-Ce复合氧化物在甲苯催化氧化中展现出优异的催化性能。研究结果为新型高效降解VOCs催化材料的设计和开发提供了新思路。
In order to develop high-efficient, stable and low temperature active catalytic materials for VOCs degradation, a series of Mn-Ce catalysts with various Mn/Ce mole ratios(MnO2, Mn0.95Ce0.05Ox, Mn0.90Ce0.10Ox,Mn0.80Ce0.20Ox & Mn0.60Ce0.40Ox) were prepared by a traditional hydrothermal synthesis method. The physicochemical properties of these catalysts were characterized and analyzed by SEM, BET, XRD, H2-TPR,O2-TPD and Raman spectroscopy, and their catalytic oxidation of toluene was investigated. The results indicated that Mn-Ce composite oxides prepared by simple hydrothermal synthesis method were microspheres, while Ce addition caused the disappearance of the nano-needle borne on the catalyst surfaces and the formation of smooth microspheres. The catalysts with various Mn/Ce mole ratios exhibited different catalytic activity for toluene oxidation, of which Mn0.80Ce0.20Ox had the best performance, this was ascribed to its strong redox properties,high chemisorbed-oxygen content and the existence of Mn-Ce solid solution. Thus, the morphology and physicochemical properties of the catalysts could be regulated by controlling the Ce content, which enabled these Mn-Ce composite oxides to exhibit excellent catalytic performance in toluene oxidation. This study provided a new idea for the design and development of novel VOCs catalytic materials with high efficiency.
作者
喻成龙
杨文亭
夏良海
吴军良
毛素华
胡玲玉
符冲
鲁美娟
YU Chenglong;YANG Wenting;XIA Lianghai;WU Junliang;MAO Suhua;HU Lingyu;FU Chong;LU Meijuan(School of Land Resource and Environment,Jiangxi Agricultural University,Nanchang 330045,China;School of Agricultural Sciences,Jiangxi Agricultural University,Nanchang 330045,China;School of Environment and Energy,South China University of Technology,Guangzhou 510006,China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2020年第6期1554-1562,共9页
Chinese Journal of Environmental Engineering
基金
国家自然科学基金资助项目(51508245,31360108,51808269)
江西省自然科学基金资助项目(20192BAB213020)。
