Study on the Catalytic Performance of High-Surface-Area Ce-Zr Modified Alumina Supported Catalysts for Methane Combustion and Automotive Exhaust Purification
X-ray fluorescence spectrometry was applied to the determination of 11 oxides,SiO_2,Fe_2O_3,Na_2O,K_2O,CaO,TiO_2,P_2O_5,ZnO,V_2O_5,Ga_2O_3 and Cr_2O_3 present as impurities in aluminum oxide.
When the mass concentration of glyphosate and COD in the initial wastewater is 10000 and 30000mg/L respectively,and the dosage of Al-1 active aluminum oxide is 10mL(the quantity of wastewater is 100 mL per batch),the removal rate of glyphosate and COD is over 98% and 50% respectively.
Methods The samples were extracted by the aluminum oxide(neutral)column. The determination was performed by HPLC using C18 column(200 mm× 4.6 mm,5 μ m),column temperature:25℃. The mobile phase consisted of water-acelonitrile-potassium dihydrogen phosphate-sodium laurylsulate(50 ∶ 50 ∶ 0.3 ∶ 0.2).
A description is given of the separation of Cr(Ⅲ) and Cr(Ⅵ) in industrial wastewaters with aluminium oxide(active) in 0.001—0.01 mol/L NaOH. The absorbed Cr(Ⅲ) was then recovered from the column by elution with 1 mol/L H_2SO_4. The Cr(Ⅲ) and Cr(Ⅵ) can be determined respectively by photometric method.
The aluminium oxide produced by Shandong Aluminium Eactory contained about 45% of α-Al_2O_3 and 55% r-and k-Al_2O_3. The concentrations of airborne Al_2O_3 in different workplaces in the workshop were 5.80-225.15mg/m~3. The dust particles of less than 5 μ in diameter were counted up to 65% of the whole dusty mass.
In this paper the microstructure and property of boronaluminizing layer on 45, T8, 5CrMnMo,3Cr2W8V steel immersed in fusing borax bath added with aluminium oxide powders and reductant are reseached.
Cband 22-times frequency,multiplier has been developed and integrated on two 20×60×1mm~3aluminium oxide ceramic chips,in the range of -40℃～+70℃ temperature compressing harmonics better than -50dB
The even surface that can provide working surface in the application of carbon nanotube film was obtained by disposal of aluminum and alumina oxide grad-ually. The disposal results of alumina by 5% NaOH and 6%H3PO4+1.8% H2CrO4 were compared
Porous Alumina Oxide(PAO) thin films are prepared by the anodization of aluminium sheets in 15%wt sulfuric acide aqueous solution,0.3 mol/L oxalic acide aqueous solution and phosphorus acide aqueous solution at 0 ℃ under a constant voltage of 18 V 、40 V and 90 V for 1 h,respectively.
在温度0℃下,采用阳极氧化法分别在15%wt的硫酸水溶液、0.3 mol/L的草酸水溶液和0.3mol/L的磷酸水溶液中制备了多孔氧化铝薄膜. 电压分别为18 V、40 V和90 V,氧化时间是1 h.
In this paper, with solid particles such as hollow alumina oxide ball, powdered graphite, titanic mineral powder as bed layer materials, the authors study the heat transfer between a gas-solid fluidizedbed and solid surface A criterion relation, that is, Numax=0.85Ar0.25 is obtained in the range of A =50~3x103. It is shown that calculation results are in good agreement with those obtained in the tests
Images of SEM and FE-SEM indicate that anodic alumina oxide template enlarged with ultrasonic wave for 20min has nearly ideal nanopore arrays,the diameter of pore is enlarged from 30nm to 70nm. Distinctly the effect with ultrasonic wave is better than ordinary method.
Mordenite composite membranes were prepared by means of coating a porous α-alumina support with nanosized mordenite seeds followed by hydrothermal crystallization.
A nano-alumina with high specific area was prepared using a homogeneous precipitation method with titanium dioxide and barium oxide as modifying additives.
Results showed that 5 wt% TiO2 or BaO added in the alumina gels can decrease the particle size and increase the specific area, but excessive TiO2 or BaO could deteriorate the properties of α-Al2O3.
Cu nanotubes and nanowires were fabricated by electroless deposition using porous aluminum oxide membrane as template in coating bath at room temperature.
The feasibility of hydrolysis of a mixture of peptides with an enzyme from the bacterium Xanthomonas rubrilineans, displaying a peptidase activity and immobilized on aluminum oxide, was studied.
The influence of the parameter humidity for the most common TLC sorbents (aluminium oxide, silicagel, kieselguhr, polyamide, cellulose, carbon, graphitized carbon black, magnesium hydroxide and magnesium silicate) has been studied.
Aluminium oxide G, silica gel G, and magnesium silicate were used as the adsorbent and formamide, ethylene glycol, and a pH=2.4 buffer as the liquid stationary phase.
The addition of 20-35 wt % clay largely results in a sharp in reduction of the macropore region and, correspondingly, provides the alumina oxide average strength of the extrudates of ～10-12 MN/m2, which is sufficient for industrial supports.
氧化铝
alumina
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