公开(公告)号：US20150290625A1

公开(公告)日：2015-10-15

申请号：US14646333

申请日：2013-11-25

申请人： COUNCIL OF SCIENTIFIC AND INDUSTRIAL RESEARCH

发明人： Rajib Lochan GOSWAMEE ,  Mridusmita MISHRA ,  Anil Kumar Sarma BARUAH

IPC分类号： B01J23/755 ,  B01J23/00 ,  B01J21/16 ,  B01D53/86 ,  B01J37/34 ,  B01J37/08 ,  B01J37/02 ,  B01J23/26 ,  B01J35/04

CPC分类号： B01J23/755 ,  B01D53/8628 ,  B01D2255/2047 ,  B01D2255/20753 ,  B01D2255/20784 ,  B01D2255/20792 ,  B01D2255/2092 ,  B01D2255/9022 ,  B01D2255/915 ,  B01D2257/402 ,  B01J21/16 ,  B01J23/007 ,  B01J23/02 ,  B01J23/06 ,  B01J23/26 ,  B01J23/34 ,  B01J27/00 ,  B01J29/049 ,  B01J35/04 ,  B01J37/009 ,  B01J37/0215 ,  B01J37/08 ,  B01J37/30 ,  B01J37/343 ,  Y02C20/10

摘要： In the present invention there is provided a process for the preparation of nano-oxide coated catalysts useful for the treatment of toxic gases by coating of composite materials containing LDHs over ceramic monolithic substrates. The process combines reacting oxides and salts of metals in a known manner so as to prepare LDHs or mixed metal layered hydroxides such as Ni—Al, Mg—Al, Zn—Cr—Al type possessing positive layer charge, from which a stable gel is prepared by adding swellable clay having a negative charge e.g. montmorillonite, laponite, hectorite etc. in different LDH:clay ratio in an aqueous medium and homogenising the same with high speed homogeniser and ultrasonicator in a high intensity ultrasonic processor. The gel is then dip-coated over cordierite/mulite honey-comb monolithic supports at various dipping and withdrawal rates. The dip-coated monoliths are then dried and calcined at different temperatures to develop the alumino-silicate supported nano-oxide coats over honey-comb ceramic substrates for carrying out decomposition of N2O gas in a He flow in various flow rates at 400 to 600° C. temperature in a cylindrical quartz tube.

摘要翻译： 在本发明中，提供了一种用于制备可用于通过在陶瓷整体式衬底上涂覆含有LDH的复合材料来处理有毒气体的纳米氧化物涂覆的催化剂的方法。 该方法以已知方式结合氧化物和金属盐，以制备具有正层电荷的LDH或混合金属层状氢氧化物如Ni-Al，Mg-Al，Zn-Cr-Al型，其中稳定的凝胶是 通过加入具有负电荷的可膨胀粘土制备，例如 蒙脱石，锂蒙脱石，锂蒙脱石等在不同的LDH：粘土比例的水性介质中，并在高强度超声波处理机中用高速均化器和超声波振荡器均匀化。 然后将凝胶以不同的浸渍和取出速率浸渍在堇青石/多孔蜂窝状整体载体上。 然后将浸涂的整料干燥并在不同温度下煅烧，以在蜂窝陶瓷基底上形成铝硅酸盐负载的纳米氧化物涂层，以在400至600度的各种流速下进行He流中的N2O气体的分解 C.在圆柱形石英管中的温度。