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Spectroscopic studies of MFI and USY zeolite layers over stainless steel 316L wire gauze meshes.
Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy ( IF 4.4 ) Pub Date : 2020-01-10 , DOI: 10.1016/j.saa.2020.118060
Ł Kuterasiński 1 , P Bodzioch 2 , K Dymek 2 , R J Jędrzejczyk 3 , D K Chlebda 4 , J Łojewska 4 , M Sitarz 5 , G Kurowski 2 , P Jeleń 5 , P J Jodłowski 2
Affiliation  

The objective of our study was to develop and optimize the in situ synthesis of zeolitic thin coatings with USY (ultrastabilised form of faujasite) and MFI (Model Five) type structure on metallic structured catalysts supports using the hydrothermal method. Thus, obtained zeolitic materials were studied in terms of their prospective activity in selective catalytic reduction of nitrogen oxides (SCR of NOx) with ammonia. Optimization of the preparation method consisted of several steps including: the pretreatment of steel carrier to obtain an adhesive surface, hydrothermal synthesis of zeolites at different conditions and adjustment of the zeolite structure type (MFI vs. USY). As a result, uniform zeolitic layers were deposited on steel supports. Prepared structured supports were ion-exchanged with copper or cobalt precursors to obtain active catalysts and then characterised by various physicochemical methods with a particular reference to the in situ Fourier-Transform Infrared Spectroscopy (FTIR), Ultraviolet-Visible Diffusion Reflectance Spectroscopy (DRS-UV/VIS) and Raman spectroscopy. For CuUSY sample, slightly better catalytic properties are related to higher copper content. In the case of Co-samples, worse catalytic properties in comparison with Cu counterparts might imply from higher concentration of Brønsted acid sites, lower cobalt loading (thus concentration of Lewis acid sites) and the presence of cobalt cation significantly in oxide form (evidenced by Raman, DRS-UV/VIS spectroscopy and by in situ FT-IR sorption studies).

中文翻译:

316L不锈钢丝网上的MFI和USY沸石层的光谱研究。

我们研究的目的是使用水热法开发和优化USY(超稳定型八面沸石)和MFI(五型)结构在金属结构催化剂载体上的沸石薄涂层的原位合成。因此,就所获得的沸石材料在用氨选择性催化还原氮氧化物(NOx的SCR)方面的预期活性进行了研究。制备方法的优化包括几个步骤,包括:预处理钢载体以获得粘合表面,在不同条件下水热合成沸石以及调整沸石的结构类型(MFI与USY)。结果,均匀的沸石层沉积在钢载体上。将制备的结构化载体与铜或钴前体进行离子交换以获得活性催化剂,然后通过各种物理化学方法进行表征,特别是参考原位傅立叶变换红外光谱(FTIR),紫外-可见扩散反射光谱(DRS-UV) / VIS)和拉曼光谱。对于CuUSY样品,稍好的催化性能与较高的铜含量有关。就钴样品而言,与铜对应物相比,较差的催化性能可能暗示着较高的布朗斯台德酸位点浓度,较低的钴载量(因此路易斯酸位点的浓度)和氧化物形式的钴阳离子的存在(证据表明为拉曼光谱,DRS-UV / VIS光谱和原位FT-IR吸附研究。
更新日期:2020-01-11
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