采用共沉淀法制备铈、锆氧化物固溶体。发现以适当配比的（NH4）HCO3和NH3·H2O混合溶液作为沉淀剂，同时控制沉淀过成中的反应条件，所得到的沉淀在较低的温度（400℃）下焙烧即可形成铈、锆氧化物固溶体。该固溶体具有较大的比表面积和高的储氧能力。形成沉淀后添加适量表面活性剂，可进一步提高产品的比表面积而对其还原行为和储氧性能几乎无影响。对制得的氧化物以，-射线衍射、程序升温还原、氧的脉冲滴定和液氮物理吸附等方法进行了表征。

采用程序升温还原研究了氧化铈气凝胶担载氧化铜催化剂的还原行为，并与其对一氧化碳氧化反应的催化活性进行了关联&发现此类催化剂中存在两种类型的氧化铜，即体相氧化铜和分散于载体表面的氧化铜，且后者中的部分氧化铜还原后易被氧化。随着此易被氧化的铜含量的增加，催化剂对一氧化碳氧化反应的催化活性升高，表明此种类型的铜为催化剂的活性组分。

以一氧化碳氧化为探针反应，考察了氧化铈气凝胶担载氧化铜催化剂的催化活性，研究了催化剂中氧化铜的含量、载体及催化剂的焙烧温度对催化剂活性的影响。结果表明，氧化铈气凝胶担载的氧化铜催化剂对一氧化碳氧化反应呈现出高催化活性，适当温度下焙烧载体及催化剂有利于提高催化剂的催化活性；随着催化剂中氧化铜含量的增加，一氧化碳完全转化的温度降低，但当w（CuO）＞12%时，过量的氧化铜以体相形式而不是以高分散形式存在，对催化剂活性的影响很小。

A single phase solid solution of Ce-Zr-O can be made by using NH4HCO3 solution as precipitating agent. The influence of preparation conditions, such as pH, Zr4+/(CO32-+HCO3-) and Ce3+/Zr4+ ratio on the formation of the solid solution were investigated. The results show that a single phase Ce-Zr-O solid solution can be formed only under a narrow window of preparation conditions, indicating that some compounds are formed in the precipitating process. The compound may contain Ce3+, Zr4+, CO3 2-, HCO3-, and OH-. The solid solution so prepared can be described as Ce0.37Zr0.63O2.

Ultra-fine particles of La0.5RE0.1Sr0.4MnO3 (RE: Y, Dy, Sm or Ce) with perovskite structure were prepared by the co-precipitation method, resulting in high surface area and good thermal stability catalysts (SBET reached 45 and 16.5 m2/g, upon calcination at 700 and 1000oC, respectively). The thermal stability of these ultrafine particles was effectively improved with partial substitution of RE3+ (Y3+, Dy3+, or Sm3+) for La3+ in La0.6Sr0.4MnO3. The catalysts exhibited high activity for the total combustion of methane. For the catalysts calcined at 1000℃, La0.5RE0.1Sr0.4MnO3 (RE: Y or Dy) were much more active and showed much higher specific surface area than La0.6Sr0.4MnO3.

A teehnique for preparing perovskite-type oxides was developed. By this technique, ultra-fine particles of La0.9 RE0.1MnO3 (RE: Y, Qe, Pr, Sin, Gd, or Dy) with high surface area and single perovskite structure were prepared, and the series of La0.9 RE0.1MnO3 catalysts were studied experimentally. The so prepared ultra-fine particles exhibites high catalytic activity for CH4 total oxidation. The ultra-fine particles of La0.9 RE0.1MnO3 (except for La0.9 Pr0.1MnO3) prepared by this method are thermally much more stable than LaMnO3. of the La0.9RE0.1MnO3 series, La0.9Y0.1MnO3 is most thermally stable, and La0.9Y0.1MnO3 or La0.9Gd0.1MnO3 (varies with calcitation temperature) exhibits the highest catalytic activity for total oxidation of methane. The specific surtface area of La0.9Y0.1MnO3 calcined st 1000℃ reaches 14.9m2·g-1, while the specific suface area of LaMnO3 calcined at the same temperature is only 1.8 m2·g-1.

Ultra-fine particles of La1−xAxMnO3 (A=Ba2+, Sr2+ or Ca2+, x≤0.3) with high surface area and single perovskite structure were prepared by a Na2CO3-NaOH coprecipitation method. The so-prepared ultra-fine particles exhibited high catalytic activity for CH4 total oxidation. The ultra-fine particles of La1−xBaxMnO3 prepared with this method were thermally more stable than LaMnO3 and La1-xSrxMnO3, and its surface areas were close to 20m2/g after sintering at 1000℃for 2 h. La1-xBaxMnO3 exhibited higher activity for methane total oxidation than La1-xSrxMnO3, and among the La1-xBaxMnO3 series La0.8Ba0.2MnO3 showed highest activity.

This research discusses a technique for the synthesis of ultrafine LaBO3 (B: Co, Mn) and La1-xSrxBO3 with a perovskite structure, in which a solution of Na2CO3-NaOH was adopted as the precipitating agent and the supercritical drying method was applied. By means of this technique, the mean particle size obtained was about 15nm and its corresponding specific surface area was 30m2g-1. The activity for CO oxidation over LaBO3 increased significantly with a decrease of its particle size. In addition, the substitution of strontium for lanthanum in nanometers LaBO3 increased the activity.

a material calcined at 650℃, ∼5 at.% Cu content is sufficient for maximum activity. Cu-O-Ce phases, comprising copper oxide clusters strongly associated with ceria, are proposed as the active sites for the reaction. No inhibition by CO2is observed at temperatures above 140℃, but the combined effect of H2O and CO2 is stronger, requiring operation at 165℃ for 99% CO conversion and 65% selectivity.

In this work, the Cu/ZrO2 catalysts, in which the suppot zirconia is made by supercritical drying, exhibit high activity and selectivity for the synthesis of methanol from CO/H2. Potassium is an effective promoter for the catalysts. EXAFS results reveal that the copper atoms in the reduced and used catalysts are predominantly in the zero valent state and in the course of reaction the copper particles redispersed to a higher dispersion state.