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 ...

Alumina is one of the most widely used ceramic materials as catalysts, catalyst supports and absorbents, and also wear resistant coating. This study focused on fabricating and characterizing of alumina ceramic nanoparticles fabricated using new and simple sol-gel method. Aluminium oxide (Al2O3) nanoparticles were synthesized by iron (III) nitrate 9-hydrate as precursor. Physicochemical properti...

In the present study, γ-Al2O3 was fabricated from Tan Rai alumina hydroxide by some following steps: purifying hydroxitde HCl solution 5% to remove impurities, dissolving 25% obtain AlCl3 and then react with (NH4)2CO3 get AACH, decomposition of AACH at 500oC produce γ-Al2O3. After that, Sodium dodecyl sulfate (SDS) used modify surface increased area. The material will be removal Rhodamine B was...

Supported sulfated zirconia catalysts with zirconia contents of 10, 20 and 50 wt% were prepared by impregnation of SiO2 and γ-Al2O3 supports with H2SO4/Zr(SO4)2 solutions followed by calcination at 923 K. The catalysts were characterized by X-ray diffraction, extended X-ray absorption fine structure measurements, thermal analysis, UV–vis spectroscopy, and electron microscopy. Tetragonal zirconi...

Obtaining an atomic-scale description of the chemical interactions phosphates with oxide support, such as γ-Al2O3, is essential to get a rational understanding role phosphate additives for great number heterogeneous catalysts, well improve use this element. Combining cutting-edge Dynamic Nuclear Polarization Surface Enhanced NMR Spectroscopy (DNP SENS) techniques Density Functional Theory (DFT)...

this paper reports results of a study regarding the activities of nano structure mn/γ-al2o3 and γ-al2o3 catalysts for oxidation of 2-propanol (as a model of volatile organic compound). nanostructure of catalysts was revealed using xrd, sem and tem techniques. catalytic studies were carried out in u-shaped packed bed reactor under atmospheric pressure and at the reaction temperature of 150- 500°...

Agricultural non-point pollution is the biggest source in China from 2009, treatment of agricultural surface runoff very important to mitigate eutrophication rivers and lakes because one key type pollution. In this study, farmland Chengdu Plain was treated for year (2017 ~ 2018) by combination technology new material (waste fir Hemlock sawdust as substrate) bioreactor denitrification Vertical-f...

Based on density functional methods, we investigate the origin of variations in electronic structures and dielectric constants of representative alumina polymorphs. We consider the most stable -Al2O3 and three metastable phases of alumina, , , and -Al2O3. Computed energy gaps are found to be in the order of , which can be understood based on electrostatic potentials at specific lattice sites; w...

Thermally sprayed ceramic coatings such as alumina have a specific microstructure characterized by porosity and microcracks. In addition, process-related phase transformation from α-Al2O3 to γ-Al2O3 typically occurs, which affects the properties of compared sintered alumina. previous study, simultaneous additions Cr2O3 TiO2 already extended improved property profile pure coating (i.e., sliding ...