| In、Sn和Ti纳米复合物对CH4气敏和催化性能研究 | |
| Sensing Property and Catalytic Activity of In, Sn and Ti Nanocomposites for CH4 | |
| 摘要: 用可控湿化学共沉淀法研制了In2O3-SnO2纳米复合物，通过控制金属盐浓度、阳离子比、沉淀pH值和老化时间，制得化学均一的两元复合物，引入适量的第三组分TiO2制得三元纳米复合氧化物，研究了TiO2添加对材料气敏和CH4催化反应活性的影响，用各种分析方法对复合物进行物性和结构表征，从对CH4气敏和催化活性测定的结果表明，两元25%In2O3-75%SnO2复合物和三元(25%In2O3-75%SnO2)-20%TiO2复合物对CH4具有较好的灵敏度和催化活性，两者有相同变化趋势，也提高了对CO的选择性，再经过掺杂对基质进行结构调变和表面修饰，进一步提高气敏和催化活性。用程序升温吸-脱附(TPD)实验和X-射线光电子能谱(XPS)分析研究了纳米复合物表面对待测气体和氧的吸脱附行为和组分间电子和化学的相互作用，探讨了气敏机制。 | |
| 关键词: 共沉淀法 In、Sn和Ti 气敏性能 催化活性 | |
| 基金项目: | |
| Abstract: A novel CH4 gas sensor based on nanocomplex oxides of Sn, In and Ti were developed and studied. The binary nanocomposite of 20%In2O3-80%SnO2 was prepared using a chemical controlled co-precipitation method through manipulating total metal salt concentration，the In/Sn cation ratio, precipitation pH values and aging time. TiCl4 solution was added dropwise to the binary precipitated solution to form the precursor of trinary nanocomposite (25%In2O3-75%SnO2)-20%TiO2. The precursor was calcined at temperature of 600 ℃ for 6 h. The performance and phase structure of materials were characterized using various analysis methods, and their sensing and catalytic activities for CH4 combustion were examined. The results show that these nanocomposites exhibit high sensitivity and selectivity for the detection of CH4, and the sensitivity depends on the complex composition, calcination and operation temperature. The sensing and catalytic performances were further enhanced by the introduction of non-reducible oxide, such as MgO as surface modifying material. The gas-sensing mechanism of the CH4 sensor was also discussed by temperature-programmed desorption (TPD) studies and X-ray photoelectron spectroscopic (XPS) analysis at gas-sensing operating temperature. | |
| Keywords: co-precipitation In, Sn and Ti gas-sensing catalytic activity | |
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| 白守礼,李殿卿,张周珺,黄小葳,罗瑞贤,陈霭璠.In、Sn和Ti纳米复合物对CH4气敏和催化性能研究[J].无机化学学报,2006,22(12):2152-2158. | |
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