Temperature dependence of hydrogen adsorption properties of nickel-doped mesoporous silica
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The catalysts of strongly acidic mesopore include the strongly acidic components on the pore wall of mesoporous materials,the surface of the mesopores reformed by sulfonic acid groups,the heat treatment of microporous zeolites and the wall of mesoporous materials containing the zeolite structure of strong acidity.The strongly acidic mesoporous catalysts of various types possess different synthetic methods and characteristics.The synthesis of strongly acidic mesoporous catalysts is systemically introduced in this paper and the research prospects of strongly acidic mesoporous catalysts are forecasted.
Mesoporous organosilica
Sulfonic acid
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Mesoporous organosilica
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Template method pattern
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A study was carried out to compare the rates of absorption of nickel from two nickel complexes and two nickel salts in the West African Dwarf (WAD) goat. Treatments consisted of oral administration of 5mg equivalents of elemental nickel from nickel sulphate hexahydrate (NiSO4.6H2O); nickel chloride hexahydrate (NiCl2.6H2O); nickel sodium monofluorophosphate (Ni-SMFP) complex and nickel-chloroquine (Ni-Clrq) complex. Changes in the plasma levels of nickel were monitored until the concentration declined. Nickel absorption into the blood was in the order: Ni-SMFP>NiClrq>NiSO4.6H2O>NiCl2.6H2O indicating that nickel is more readily available to goats in the complex forms. JARD Vol. 1 2001: pp. 23-30
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A characterization study was undertaken with eighteen kinds of nickel/alumina impregnated catalysts prepared by using three nickel compounds (nickel (II) acetylacetonate, nickel (II) acetate and nickel (II) chloride) as the nickel source material and by applying two impregnation methods (single and multiple). The catalysts prepared by using nickel (II) acetylacetonate and nickel (II) acetate showed a similar distribution and average of nickel particle diameters regardless of nickel source material or impregnation method. The distribution broadening and the average increased with increasing nickel content for the catalysts prepared by using nickel (II) chloride. The rate of benzene hydrogenation was proportional to the nickel surface area regardless of nickel source material or impregnation method.
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Characterization
Mesoporous organosilica
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Abstract Reduction of anhydrous nickel(II) compounds in the presence of diazadienes RN=CR'-CR' = NR, |(DAD), yields (DAD) 2 Ni(0). This complex 1 with R = CH(i-C 3 H 7 ) 2 is especially reactive and comproportionates with DADNiBr 2 (2) to yield the bromobridged dimeric nickel(I) species (DADNiBr) 2 (3). The crystal and molecular structure of 3 has been determined by single crystal X-ray diffraction: Space group Pbca with a = 1225.8(12), b = 1474.8(14) and c = 2167.4(22) pm; Ra = 0.076, 1034 reflections. Catalytic tetramerisation of substituted alkynes with 1 is discussed in view of the very easy formation of dimers 3.
Anhydrous
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The recent progress, particularly in this decade, in catalytic applications of mesoporous ZSM-5 was reviewed. Mesoporous ZSM-5 materials aim to combine the shape-selectivity from micropores of ZSM-5 with enhanced mass transportation from the additional mesoporosity in catalytic reactions. The reactions discussed in this review are classified into two types: (1) the reactions mainly occurred on the external surface or in the pore mouths of the mesoporous ZSM-5 and (2) the reactions mainly occurred in micropores of ZSM-5. The external acid sites of mesoporous ZSM-5 enable the reactions involving bulky reactants that exceed the size of ZSM-5 micropores; and the presence of mesoporosity which improves the mass transport of reactants as well as products, reduces diffusion limitation and accelerates catalytic reaction. Although the advantages of mesoporous ZSM-5 compared with the conventional one are closely related to high external surface area and large mesopore volume, the acidity, including the type, strength and amount of acid sites and Al distribution, should be taken into account when the mesoporous ZSM-5 is utilized as catalyst in a real reaction. Finally, future challenges and opportunities for mesoporous ZSM-5 materials are presented. Keywords: Catalysis, mesoporous zeolite, ZSM-5.
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Mesoporous organosilica
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Dithiocarbamate
Nickel compounds
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Nickel allergy is the most frequent contact allergy and is also one of the major background factors for hand eczema. The clinical significance of nickel release from coins was discussed when the composition of euro coins was decided. Current European coinage is dominated by cupro-nickel coins (Cu 75; Ni 25); other nickel-containing and non-nickel alloys are also used. Nickel release from used coinage from the UK, Sweden and France was determined. It was shown that nickel ions are readily available on the surface of used coins. After 2 min in artificial sweat, approximately 2 microg of nickel per coin was extracted from cupro-nickel coins. Less nickel was extracted from non-nickel coins. Nickel on the surface was mainly present as chloride. After 1 week in artificial sweat approximately 30 microg/cm2 was released from cupro-nickel coins: less nickel was released from coins made of other nickel alloys. Theoretically, several microg of nickel salts may be transferred daily onto hands by intense handling of high-nickel-releasing coins.
Nickel allergy
numismatics
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