当前位置: X-MOL 学术ChemCatChem › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Functionalized Iron Hydroxyapatite as Eco‐friendly Catalyst for NH3‐SCR Reaction: Activity and Role of Iron Speciation on the Surface
ChemCatChem ( IF 4.5 ) Pub Date : 2020-01-16 , DOI: 10.1002/cctc.201901813
Sebastiano Campisi 1 , Melissa G. Galloni 1 , Sergio G. Marchetti 2 , Aline Auroux 3 , Georgeta Postole 3 , Antonella Gervasini 1
Affiliation  

Eco‐friendly catalysts have been obtained by functionalizing hydroxyapatite (HAP) with iron (Fe/HAP), according to three preparative methods (flash ionic exchange, deposition‐precipitation, and impregnation). Fe/HAP samples (ca. 2–7 wt.% Fe) have been tested in the reaction of NOx reduction by ammonia (NH3‐SCR) in the 120–500 °C interval with different NH3/NO ratios (0.6–2) at fixed contact time (0.12 s). All Fe/HAP samples were active and selective in the NH3‐SCR reaction starting from ca. 350 °C. Better performances have been observed on catalysts prepared by deposition‐precipitation and impregnation (about 70 % of NOx conversion and selectivity to N2 higher than 95 % at 350 °C), where α‐Fe2O3 and 3D‐Fe2O3 nanoclusters were present, as indicated by Mössbauer and UV‐Vis‐DR spectroscopies. On the opposite, paramagnetic Fe3+ centres were the predominant species on samples prepared by flash ionic exchange. Further characterization techniques (XRPD, N2‐physisorption, acidity by NH3 adsorption, and H2‐TPR) have concurred to elucidate Fe‐sitting HAP and structure‐activity relationships.

中文翻译:

功能化羟基磷灰石铁作为NH3-SCR反应的环保催化剂:表面上铁形态的活性和作用

根据三种制备方法(快速离子交换,沉积沉淀和浸渍),通过用铁(Fe / HAP)对羟基磷灰石(HAP)进行官能化处理,获得了环保催化剂。的Fe / HAP样品(CA 2-7重量%的Fe)已经在NO的反应进行了测试X由氨还原(NH 3在具有不同的NH 120-500℃的间隔-SCR)3 / NO比(0.6 –2)在固定的接触时间(0.12 s)。从ca开始,所有Fe / HAP样品在NH 3 SCR反应中均具有活性和选择性。350℃。更好的性能,已观察到由沉积-沉淀和浸渍法制备的催化剂(约NO的70%X转化率和选择性为N 2在95%以上,在350℃),其中的α-Fe 2 ö 33D -Fe 2个ö 3纳米簇存在,通过穆斯堡尔和紫外-可见- DR光谱所示。相反,顺磁性Fe 3+中心是通过快速离子交换制备的样品中的主要物质。进一步的表征技术(XRPD,N 2物理吸附,NH 3吸附的酸度和H 2 -TPR)已被用来阐明Fe坐立HAP与结构活性之间的关系。
更新日期:2020-01-17
down
wechat
bug