Carmo José Vitor C do, Lima Cleanio L, Mota Gabriela, Santos Ariane M S, Costa Ludyane N, Ghosh Anupama, Viana Bartolomeu C, Silva Monique, Soares João M, Tehuacanero-Cuapa Samuel, Lang Rossano, Oliveira Alcineia C, Rodríguez-Castellón Enrique, Rodríguez-Aguado Elena
Department of Analytical and Chemical-Physic Chemistry, Pici Campus-Block 940, Federal University of Ceará, Fortaleza 60040-531, Brazil.
Material Science and Engineering & Physics Department, Federal University of Piauí, Teresina 64049-550, Brazil.
Materials (Basel). 2021 Apr 24;14(9):2181. doi: 10.3390/ma14092181.
Effects of the incorporation of Cr, Ni, Co, Ag, Al, Ni and Pt cations in titanate nanotubes (NTs) were examined on the NO conversion. The structural and morphological characterizations evidenced that the ion-exchange reaction of Cr, Co, Ni and Al ions with the NTs produced catalysts with metals included in the interlayer regions of the trititanate NTs whereas an assembly of Ag and Pt nanoparticles were either on the nanotubes surface or inner diameters through an impregnation process. Understanding the role of the different metal cations intercalated or supported on the nanotubes, the optimal selective catalytic reduction of NO by CO reaction (SCR) conditions was investigated by carrying out variations in the reaction temperature, SO and HO poisoning and long-term stability runs. Pt nanoparticles on the NTs exhibited superior activity compared to the Cr, Co and Al intercalated in the nanotubes and even to the Ag and Ni counterparts. Resistance against SO poisoning was low on NiNT due to the trititanate phase transformation into TiO and also to sulfur deposits on Ni sites. However, the interaction between Pt from PtO and Ti in the NTs favored the adsorption of both NO and CO enhancing the catalytic performance.
研究了在钛酸盐纳米管（NTs）中掺入Cr、Ni、Co、Ag、Al、Ni和Pt阳离子对NO转化的影响。结构和形态表征表明，Cr、Co、Ni和Al离子与NTs的离子交换反应产生了催化剂，其中金属包含在三钛酸盐NTs的层间区域，而Ag和Pt纳米颗粒的聚集体通过浸渍过程位于纳米管表面或内径上。通过了解不同金属阳离子嵌入或负载在纳米管上的作用，通过改变反应温度、SO和H₂O中毒以及长期稳定性试验，研究了CO选择性催化还原NO反应（SCR）的最佳条件。与嵌入纳米管中的Cr、Co和Al相比，甚至与Ag和Ni对应物相比，NTs上的Pt纳米颗粒表现出优异的活性。由于三钛酸盐相转变为TiO₂以及Ni位点上的硫沉积，NiNT对SO中毒的抗性较低。然而，PtO中的Pt与NTs中的Ti之间的相互作用有利于NO和CO的吸附，从而提高了催化性能。
