Factors which have impacts on the performance of aluminum-anodization layer were introduced. Methods of bonding the active components with aluminum-anodization layer and applied progress of metal-supported catalysts made in the way of aluminum-anodization were also discussed. The application perspective of the catalysts was estimated.
In phosphoric acid solution,porous alumina films were fabricated for elimination hydrogen by anodization.The anodization conditions,voltage,current density,oxidation temperature,oxidation time and hot water sealing were studied.And the porous anodic aluminum oxide was investigated by scanning electron microscopy.The results of SEM for fabricated porous alumina films showed that the thickness of anodic alumina films can reach 13.4 μm and the pores diameter 100 nm.In the condition of normal temperature,H2 concentration 1.1%~1.3%,space velocity 20 000 L/h,the elimination hydrogen efficiency of the elimination hydrogen catalyst made from supports fabricated as above by supported Pt-Pd was above 85%.
Catalyst composing was investigated by orthogonal test in combination with single factor experiment.The effects of Cr-promoter and different mass ratios on the catalyst performance were investigated at 220℃ and 250℃.The mole ratio of steam to methanol was 1.3,and the liquid space velocity was 1.5 h-1.The result is:the best Cu/Cr mass ratio was 1∶1,and the CO content decreased 50% while the methanol conversion increased 20%by using this catalyst.
The performance of the Cu/Zn/(Fe, Mn, Cr)/AlO catalysts were investigated at 220 ℃ for methanol steam reforming . The mole ratio of steam to methanol was 1.3, and the liquid space velocity was 1.5 h-1. The adding of Cr can enhance conversion of methanol and reduce CO production rate .CO content decreased 54% while the methanol conversion increased 20% under 220 ℃ with Cu30Zn15Cr45Al10 catalyst.
Stain resistance is the most important special performance of the stainless steel,and it will be highly improved after that be pickled and passivated.In theory,this article describes the necessity and theory of pickling and passivating,and the process and method it used;then,according to the actual situation of the manufacturing process of the stainless steel,the article gives a detailed statement of the characteristic and the problem of pickling and passivating and describes its quality control general requirements.
In this paper, steam reforming from methanol for H2 production over Cu-based catalyst is our focus. Based on recent researches,the activities of different catalyst system are concerned. The mechanism of this reaction and the factors which could affect the activity of the catalyst are both reviewed. Meanwhile, the intending direction is mentioned.
Hydrogen supply for portable fuel cell is one of the difficult problem in its research and application,it be introduced that specific requirements of AIP submarine power for hydrogen production of fuel cell and global research progress on this area at present in paper,and expatiated the principle of work about hydrogen production from hydrolysis of sodium borohydride solution and its merits be applied to the submarine environment,and showed the feasibility that applied this method to our AIP submarine.
Nano Co_3O_4 was prepared by compliex precipitation method with the precursors of the compound of cobalt such as Co(NO_3)_2 · 6H~2O, NH_3 ·H_2O, H_2O_2 and NaOH in water. By X-ray powder Diffraction(XRD)measurements and Transmission Electron Microscopy (TEM) observations, The effects of different reactants, the mol ratio of reactants and the reaction temperature on composition and structure of product was discussed. The results shown that it can be obtained that pure, high dispersing, evengranular, high crystallinity and spherical nano Co_3O_4, and the most favorable experiment conditions for the preparation of nano Co_3O_4 were that 2.5~3~ ∶1(mol ratio) of [Co(NH_3)~6](NO_3)_3 and Co(NO_3)_2, 0.9~1.2~ ∶1(mol ratio) of NaOH and Co(NO_3)_2, and the reaction temperature is 80℃.