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首页> 外文期刊>Catalysis science & technology >Tin-palladium supported on alumina as a highly active and selective catalyst for hydrogenation of nitrate in actual groundwater polluted with nitrate
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Tin-palladium supported on alumina as a highly active and selective catalyst for hydrogenation of nitrate in actual groundwater polluted with nitrate

机译：Tin-palladium氧化铝作为高度支持活性和选择性加氢的催化剂实际地下水的硝酸盐污染硝酸

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摘要

We developed Sn0.5Pd/Al2O3 showing high activity and high selectivity to gaseous products towards the hydrogenation of NO3- with H-2 in aqueous NO3- solutions via precise control of the Sn/Pd molar ratio. For the catalyst with the optimum Sn/Pd molar ratio, the surface concentration of adsorbed nitrogen on the Pd sites is thought to be high and that of the adsorbed hydrogen on the Pd sites is thought to be low. This is due to the abundant supply of NO2- for the Pd sites and the prompt consumption of adsorbed H on the Pd sites for reduction of the oxidized Sn sites formed by the reduction of NO3-, respectively, leading to the high selectivity to gaseous products. Although the catalytic performance of Sn0.5Pd/Al2O3, like that of Cu0.5Pd/Al2O3, was lower in groundwater, the decrease for Sn0.5Pd/Al2O3 was less than that for Cu0.5Pd/Al2O3. Nitrate in the groundwater polluted with 0.4 mmol dm(-3) (250 cm(3)) of NO3- was completely reduced at 298 K in 24 h with a selectivity for gaseous products of around 90% in the presence of 10 mg of Sn0.5Pd/Al2O3, whereas it took 60 h in the presence of Cu0.5Pd/Al2O3, and the selectivity for gaseous products was around 75%. However, both catalysts showed comparable high activity and high selectivity in aqueous NO3- solutions. When reactions were performed in aqueous NO3- solutions containing other anions (Cl-, SO42-, and SiOxn-) present in the groundwater, Cl- had the largest negative impact but it had a smaller impact in the presence of Sn0.5Pd/Al2O3 than it did in the presence of Cu0.5Pd/Al2O3. On the basis of adsorption isotherms for Cl- and kinetics analysis of the hydrogenation of NO3-, it was concluded that Sn0.5Pd/Al2O3 had less affinity for Cl- and a strong affinity for NO3- on the Sn sites, leading to its superior catalytic performance in groundwater.
机译：我们开发了Sn0.5Pd /氧化铝显示高的活动和高选择性对气体产品NO3在水与2的加氢NO3通过精确的Sn / Pd控制解决方案摩尔比。Sn / Pd摩尔比,表面的浓度吸附氮被认为在Pd网站高的吸附氢Pd网站被认为是低。丰富的供应和Pd NO2 -的网站促使消费上的吸附H Pd网站为减少形成的氧化锡的网站分别的减少,导致高选择性气体产品。尽管的催化性能Sn0.5Pd /氧化铝,像Cu0.5Pd /氧化铝在地下水较低,减少了Sn0.5Pd /氧化铝不到的Cu0.5Pd /氧化铝。0.4污染更易与dm(3)(3)(250厘米)的NO3完全是在298 K在24小时降低吗在90%左右的选择性对气体产品10毫克Sn0.5Pd /氧化铝的存在,而花了60 h Cu0.5Pd /氧化铝的存在,和气体产品的选择性75%左右。类似的活性高,选择性高水NO3解决方案。包含在水NO3解决方案其他阴离子(Cl -、SO42 -和SiOxn)中地下水,Cl -最大的负数影响,但影响较小存在Sn0.5Pd /氧化铝的比Cu0.5Pd /氧化铝的存在。Cl -吸附等温线和动力学的加氢的分析,得出结论,Sn0.5Pd /氧化铝有亲和力Cl -和一个强大的亲和力NO3 Sn网站,导致其优越的催化在地下水的表现。

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