Montmorillonite based porous clay heterostructures modified with Fe as catalysts for selective catalytic reduction of NO with propylene
Montmorillonite based porous clay heterostructures modified with Fe as catalysts for selective catalytic reduction of NO with propylene
复制标题
DOI：
10.1016/j.cej.2018.07.201
复制
发表时间：
2018-12
影响因子：
15.1
通讯作者：
Minhao Yuan;Wen-yi Deng;Shilin Dong;Qianchen Li;Bingtao Zhao;Yaxin Su
中科院分区：
文献类型：
--
作者：
Minhao Yuan;Wen-yi Deng;Shilin Dong;Qianchen Li;Bingtao Zhao;Yaxin Su
采用离子交换法和浸渍法制备了Fe(Fe-PCH)催化剂改性蒙脱土多孔粘土异质结构。用X射线衍射仪、BET、UV-Vis、HRTEM、XPS、H2-TPR、Py-FTIR等手段对所制得的催化剂进行了表征，并用固定床反应器考察了催化剂对C3H6选择性催化还原NO的催化活性，并对反应机理进行了原位漂移研究。结果表明，浸渍法制备的催化剂对SCR-C3H6具有较高的催化活性，在400 °C下，当铁含量为8.4 wt%时，NO转化率可达96%。催化剂表征结果表明，α-Fe2O3纳米棒在PCHs通道中形成，(1+1+0)和(1+0+4)晶面暴露。α-Fe2O_3纳米棒促进了路易斯酸中心的形成。通过对反应机理的研究，提出了反应中间体主要为无机硝酸盐、乙酸酯、有机氮化合物和异氰酸酯物种。
Montmorillonite based porous clay heterostructures modified with Fe (Fe-PCH) catalysts were prepared by ion exchange and impregnation methods, respectively. The PCH samples were characterized by XRD, BET, UV-vis, HRTEM, XPS, H2-TPR, Py-FTIR, etc. The catalytic activity of the catalysts was evaluated for the selective catalytic reduction of NO with C3H6with a fixed-bed reactor and the in situ DRIFTS study was conducted to investigate the reaction mechanism. It was observed that the catalysts prepared by impregnation methods were more reactive for the SCR-C3H6, e.g., 96% of NO conversion to N2was tested at 400 °C when 8.4 wt% iron was supported on the PCH. The results of catalyst characterization indicated that α-Fe2O3nanorods formed in PCHs channels and (1 1 0) and (1 0 4) planes exposed. α-Fe2O3nanorods promoted the formation of the Lewis acid sites. With the study of DRIFTS, a reaction mechanism was proposed, where the reaction intermediates were mainly inorganic nitrates, acetates, organic nitrogen compounds and isocyanate species.