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Silica load the absence of silicon tungsten heteropoly salt Preparation and photolysis of water into hydrogen research

Author: LiangSheng
Tutor: ChenQiYuan
School: Central South University
Course: Physical and chemical
Keywords: Photolysis of water Hydrogen Production The absence of silicon tungsten heteropoly salt Synthesis Load
CLC: TQ116.2
Type: Master's thesis
Year: 2004
Downloads: 404
Quote: 0
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Abstract


Sol - gel technology , prepared four new, water-resistant and has a higher photochemical activity supported polyoxometalate microporous polyoxometalate K 8 SiW 11 O 39 / SiO 2 , K 6 CoSiW 12 O 40 < / sub> / SiO 2 , K 6 MnSiW 11 O 39 / SiO 2 , K 6 NiSiW 11 O 39 / SiO 2 . UV diffuse reflectance spectroscopy , infrared spectroscopy , thermal gravimetric analysis , X - ray powder diffraction (XRD) , the characterization of the composition and structure of these four materials . The structure shows that the formation of the microporous structure of the hybrid materials , the basic structure of the parent polyoxometalate retain chemical action , but between the polyoxometalate molecules with the silica network . N 2 assay and surface area measurement , the pore structure of more than several materials , surface physical properties and material morphology analysis . The results show that these types of materials have uniform pores, their average pore diameter of 22.46nm . Polyoxometallate compared with the parent , a specific surface area of the composite material with different improved . Were used synthetic heteropoly salt K 8 SiW 11 O 39 / SiO 2 , K < sub> 6 SiMW 11 O 39 / SiO 2 (M = Mn, Ni, Co) and supported the absence of the Keggin structure heteropolyacids K 4 SiW 12 O 40 / SiO 2 catalyst in water / methanol in acidic system , the process of hydrogen production from water photolysis at 300-400nm UV irradiation . The results show that , by the load after the hetero polyacid salt hardly soluble in water, can be used repeatedly ; supported absence Heteropolyoxometallate still has good photocatalytic activity , than the load - type non - absence heteroaryl multi maleate K < Sub > 4 SiW 12 O 40 / SiO 2 has a higher catalytic activity , the average production rate of hydrogen from non-ischemic bit 2ml · h -1 to 6 ml of h -1 .

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CLC: > Industrial Technology > Chemical Industry > Basic inorganic chemical industry > Industrial gases > Hydrogen
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