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Hydrotalcite-supported Pd-Cu catalyst for nitrate adsorption and reduction from water

机译：水滑石负载的Pd-Cu催化剂可从水中吸附和还原硝酸盐

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摘要

Hydrotalcite-supported Pd-Cu catalyst for nitrate adsorption and catalytic reduction from water is prepared by co-impregnation method and characterized by surface area (BET), X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM) and X-ray pho-toelectron spectrum (XPS). The performance of adsorption and hydrogenation of nitrate was evaluated and compared with Al_2O_3, TiO_2, and HZSM-supported Pd-Cu catalysts. The experimental results demonstrated that hydrotalcite-supported Pd-Cu catalyst exhibited a high surface area (185.3 m~2/g) and mesopore structure (average pore diameter of 52.2 A). The active metal clusters were homogeneously dispersed on the support, and the size of the most was less than 10 nm. Excellent adsorption for nitrate resulted from that nitrate ions were forced to enter the interlayer space when the calcined hydrotalcite regenerated layer structure in nitrate solution. The adsorption isotherm could be well described by the Langmuir model. The comparison between the adsorption and catalytic hydrogenation for nitrate using hydrogen indicated that nitrate reduction on hydrotalcite-supported Pd-Cu catalysts was a consecutive and dynamic adsorption and catalytic hydrogenation process. Compared with the Al_2O_3, TiO_2, and HZSM-supported catalysts, hydrotalcite-supported Pd-Cu catalyst possessed higher catalytic activity and selectivity. The analysis on the dissolving of metals in the solution demonstrated that there was hydrolyza tion on the surface of the hydrotalcite-supported Pd-Cu catalyst. However, the concentrations of dissolved metals in the solution were lower than the standard executed in China. The activity of the hydrotalcite-supported Pd-Cu catalyst for nitrate reduction kept steady after repeated use.
机译：通过共浸渍法制备了水滑石负载的Pd-Cu催化剂，用于硝酸盐的吸附和从水中的催化还原，并具有表面积（BET），X射线衍射（XRD），扫描电子显微镜（SEM），透射电子显微镜（ TEM）和X射线光电子能谱（XPS）。评价了硝酸盐的吸附和氢化性能，并与Al_2O_3，TiO_2和HZSM负载的Pd-Cu催化剂进行了比较。实验结果表明，水滑石负载的Pd-Cu催化剂具有较高的表面积（185.3 m〜2 / g）和中孔结构（平均孔径为52.2 A）。活性金属簇均匀地分散在载体上，最大的簇的尺寸小于10nm。当煅烧的水滑石在硝酸盐溶液中再生层结构时，硝酸盐离子被迫进入层间空间，从而获得了对硝酸盐的出色吸附。吸附等温线可以用Langmuir模型很好地描述。氢吸附和催化氢化硝酸的比较表明，水滑石负载的Pd-Cu催化剂上硝酸盐的还原是连续的动态吸附和催化氢化过程。与Al_2O_3，TiO_2和HZSM负载的催化剂相比，水滑石负载的Pd-Cu催化剂具有更高的催化活性和选择性。对金属在溶液中的溶解的分析表明，水滑石负载的Pd-Cu催化剂的表面上存在水解。但是，溶液中的溶解金属浓度低于中国执行的标准。重复使用后，水滑石负载的Pd-Cu催化剂的硝酸盐还原活性保持稳定。

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