نتایج جستجو برای: impregnation method

تعداد نتایج: 1632179  

2007
Y. Du

The catalytic hydrogenation of p-nitrophenol to p-aminophenol was investigated over alumina supported nickel catalysts prepared by impregnation reduction method and mechanical mixing method. The catalysts were characterized by XRD and FESEM. The results show that the nickel particle diameter of alumina supported nickel prepared by impregnation reduction method (denoted as Ni/Al2O3) is slightly ...

Journal: :iranian journal of catalysis 2012
seyed javad ahmadi morteza hosseinpour mohammad outokesh

in our current study, supercritical water impregnation (scwi) was introduced as a unique catalyst preparation method by employing the high diffusivity property of supercritical water. the method allows nano-particles to place on support surfaces in extremely dispersed conditions. the silica-based nanocatalyst granules for this purpose were prepared by initial impregnation of highly porous silic...

2004
C. Cannas M. Casu G. Piccaluga

Impregnation and deposition-precipitation syntheses have been used to obtain Y2O3/SiO2 samples. In the deposition method, the urea causes the precipitation of yttrium hydroxide, which leads to the formation of yttria nanocrystalline particles in the final composites. Delaying the silica addition up to the visible muddying of the solution, a relevant formation of yttria nanocrystalline particles...

2011
Qisheng Wu Shuiping Li

TiO2/Al-MCM-41 composites with various titania content were prepared by loading titania into the mesopores of Al-MCM-41 mesoporous molecular sieve from coal-measure kaolin as silicon and aluminum source via general sol-gel method and incipient wetness impregnation method. TiO2/Al-MCM-41 composites were characterized by XRD, FT-IR and SEM, and the photocatalytic degradation of methyl orange solu...

2012
Akane Miyazaki Ioan Balint

Alumina is one of the most widely used adsorbent for removal of dissolved pollutants from waste water. Various chemical species, especially ions, are known to be adsorbed onto alumina. On the other hand, alumina is a typical support for catalysts. Many kinds of metal supported catalysts are prepared using alumina as their support. These two roles of alumina, i.e., as adsorbent and support, are ...

2013
Atheel Hassan Alwash Zuhairi Abdullah

Characteristics and sonocatalytic activity of zeolite Y catalysts loaded with TiO2 using impregnation and ion exchange methods for the degradation of amaranth dye were investigated. The Ion-exchange method was used to encapsulate the TiO2 into the internal pores of the zeolite while the incorporation of TiO2 mostly on the external surface of zeolite was carried out using the impregnation method...

Journal: :Chemical communications 2009
Zhonghao Jin Chao Yu Xingyi Wang Ying Wan Dao Li Guanzhong Lu

Pd/mesoporous silica-carbon nanocomposites with 3.2 nm Pd particles, prepared by a simple wetness impregnation method, have demonstrated high activity at 258 K for the hydrodechlorination of chlorophenols with a high selectivity.

Journal: :Dalton transactions 2009
Hongyang Liu Ding Ma Xinhe Bao

Single-crystal platinum nanorods with high aspect ratios and tunable length were fabricated on a large scale by a glycol-assisted one-step vacuum impregnation method, using mesoporous inorganic silica SBA-15 as the host.

Journal: :Chemical communications 2007
Hyeonseok Yoon Sungrok Ko Jyongsik Jang

Palladium nanoparticles were deposited with high dispersion and stability on nitrogen-doped magnetic carbon nanoparticles by a simple impregnation method, and their catalytic performance was investigated for Heck, Suzuki, and Sonogashira coupling reactions.

Journal: :Chemical communications 2015
Zhenping Qu Lei Miao Hui Wang Qiang Fu

Highly dispersed Fe2O3 nanoparticles supported on carbon nanotubes, prepared by a simple ethanol-assisted impregnation method, showed above 90% NO conversion and selectivity at low temperatures (200-325 °C). Moreover excellent durability and stability towards SO2/H2O was obtained.

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