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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Standard and Fast Selective Catalytic Reduction of NO with NH3 on Zeolites Fe-BEA
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Standard and Fast Selective Catalytic Reduction of NO with NH3 on Zeolites Fe-BEA

机译：Fe-BEA沸石上NH3的标准快速选择催化还原NO

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摘要

Two Fe-containing BEA zeolites were prepared by ion-exchange (IE; Fe-BEA) and postsynthesis (PS; Fe-BEA/DeAl) procedures. Similar Fe content (0.8 to 0.9 Fe wt %) was evidenced for studied samples. Fe-BEA, prepared by ion exchange, contained essentially iron cations at the exchange sites of the zeolite. These iron cations are either isolated or bridged through an oxygen atom (Fe-oxo cations). In Fe-BEA/DeAl, a high portion of iron was introduced in the T-positions of zeolite lattice. The other part was either at an exchange positions or deposited as oxide clusters on the outer surface of zeolite grains. For Fe-BEA, significantly higher acidity than for Fe-BEA/DeAl was evidenced by FT-IR studies with adsorption of NH3 and CO. The catalytic performance of Fe-BEA and Fe-BEA/DeAl was investigated in standard selective catalytic reduction (SCR) (NO2/NO = 0) and fast SCR (NO2/NO = 0.85). Fe-BEA revealed high catalytic activity in both SCR NOx reactions; however, production of N2O was much more apparent over this catalyst than over Fe-BEA/DeAl. In line with EPR and IR studies, the isolated or bridged-through-an-oxygen-atom extraframework iron oxo-sites in Fe-BEA were found to deliver higher catalytic activity than the iron oxo-sites in tetrahedral framework positions in Fe-BEA/DeAl.
机译：通过离子交换（IE; Fe-BEA）和后合成（PS; Fe-BEA / DeAl）程序制备了两种含铁的BEA沸石。研究样品的铁含量相似（0.8至0.9 Fe重量％）。通过离子交换制备的Fe-BEA在沸石的交换位点上基本上包含铁阳离子。这些铁阳离子是分离的或通过氧原子桥接的（Fe-氧代阳离子）。在Fe-BEA / DeAl中，大部分铁被引入沸石晶格的T-位。另一部分位于交换位置或以氧化物簇的形式沉积在沸石颗粒的外表面上。对于Fe-BEA，通过NH3和CO吸附的FT-IR研究表明，酸度明显高于Fe-BEA / DeAl。在标准选择性催化还原反应中研究了Fe-BEA和Fe-BEA / DeAl的催化性能（ SCR）（NO2 / NO = 0）和快速SCR（NO2 / NO = 0.85）。 Fe-BEA在两个SCR NOx反应中均显示出高催化活性。但是，在该催化剂上比在Fe-BEA / DeAl上更明显地产生了N2O。与EPR和IR研究一致，发现Fe-BEA中孤立的或通过氧原子架桥的铁骨架位点比Fe-BEA的四面体骨架位的铁骨架位点具有更高的催化活性。 /交易。

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