Catalytic reduction of aqueous nitrates by metal supported catalysts on Al particles
Catalytic reduction of aqueous nitrates by metal supported catalysts on Al particles
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DOI：
10.1016/j.cej.2014.05.144
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发表时间：
2014-10
影响因子：
15.1
通讯作者：
Weirong Zhao;Xi Zhu;Y. Wang;Zhuyu Ai;Dongye Zhao
中科院分区：
文献类型：
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作者：
Weirong Zhao;Xi Zhu;Y. Wang;Zhuyu Ai;Dongye Zhao
为了促进硝酸盐在水中还原为氮气，通过在Al颗粒上负载单金属（Cu，Ni）或双金属（Pd-Cu，Pt-Cu，Au-Cu和Ru-Cu）来制备一类单或双催化剂颗粒。采用X射线衍射、X射线光电子能谱、扫描电子显微镜和透射电子显微镜对催化剂负载铝样品进行了表征。批式动力学实验表明，0.4%Pd-4%Cu/Al在pH 4.0时对氮气（N2）的选择性最高。动力学研究表明，硝酸盐可以首先还原为亚硝酸盐的Al和Cu表面在一个相对缓慢的速度，随后迅速还原为氮的贵金属表面和氨的Al和Cu表面。氮形成的选择性可以受到沉积的金属的类型和中间体亚硝酸盐和吸附在Pd表面上的原子氢的浓度的影响。
To facilitate the reduction of nitrate to nitrogen in water, a class of mono- or dual-catalyst particles was prepared by loading mono-metals (Cu, Ni) or bimetals (Pd–Cu, Pt–Cu, Au–Cu, and Ru–Cu) on Al particles. The prepared catalyst-loaded Al samples were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, and transmission electron microscopy analysis. Batch kinetic experiments indicate that 0.4%Pd–4%Cu/Al at pH 4.0 resulted in the highest selectivity for nitrogen (N2). Kinetic studies reveal that nitrate can be first reduced to nitrite on the Al and Cu surface at a relatively slow rate and subsequently was rapidly reduced to nitrogen on the noble metal surface and to ammonia on the Al and Cu surface. The selectivity for nitrogen formation can be influenced by the type of metals deposited and the concentration of intermediate nitrite and atomic hydrogen adsorbed on the Pd surface.