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在许多催化应用中双金属的Pd Au催化剂性能优于单金属催化剂.科研人员对具有可控纳米结构和高活性的Pd Au催化剂进行了广泛的研究,但该催化剂的制备需要多步且通常步骤复杂.本文仅通过浸渍和焙烧制得了Au掺杂的负载型Pd催化剂,所得Pd Au/C催化剂用于室温水相三氯乙烯加氢脱氯反应.当Pd和Au负载量分别为1.0 wt%和1.1 wt%时,在经过干燥、空气处理和H_2还原的过程后,所制得的Pd Au/C催化剂活性最高,初始转化频率(TOF)为34.0×10~(–2) mol_(TCE) mol~(–1)Pd s~(–1),是单金属1.0 wt%Pd/C催化剂TOF(2.2×10~(–2) mol_(TCE) mol~(–1)Pd s~(–1))的15倍以上.X射线吸收光谱结果表明,金的加入避免了400 oC焙烧时Pd的氧化.本文还提出了可能的催化剂纳米结构演变路径,以解释所观察到的催化现象.
Bimetallic Pd-Au catalysts perform better than monometallic catalysts in many catalytic applications.Researchers extensively studied Pd-Au catalysts with controlled nanostructures and high activity, but the preparation of the catalyst requires multiple steps and the usual steps Complex.In this paper, Au doping supported Pd catalyst was prepared by impregnation and calcination only, and the obtained Pd Au / C catalyst was used in the hydrodechlorination reaction of trichlorethylene in aqueous phase at room temperature.When the Pd and Au loadings were 1.0 wt% And 1.1 wt%, respectively, the Pd / C catalyst obtained after drying, air treatment and H2 reduction had the highest activity and the initial conversion frequency (TOF) was 34.0 × 10 ~ (-2) mol_ (TCE) (-1) Pd s ~ (-1), which is a single metal 1.0 wt% Pd / C catalyst TOF (2.2 × 10 -2 mol TCE mol -1 Pd s -1 )) X-ray absorption spectroscopy results show that the addition of gold to avoid the oxidation of Pd at 400 oC calcination.In this paper, we also proposed possible catalyst nanostructure evolution path to explain the observed catalysis.