It is discovered that migration of Cu~(2+) ion occurs as the amount of adsorption water increases, Cu~(2+) ion migrates into supercages of zeolite when it adsorbs water saturatedly but reversibly back to S(Ⅱ) position when water adsorbed decreases.
The results show that the thermal decomposition of xerogel includes three stages,which are volatilization of adsorption water and organic composition,oxygenolysis of n-butyl and acetate,and transformation of crystalline phase.
after the organic modification, the desorbing temperature and mass of the adsorption water between the clay layers decreased remarkably, with plenty of organic molecules intercalated into its galleries, MMT changed to be hydrophobic from its original hydrophilic, moreover its heat stability was greatly elevated.
Pure palygorskite has been separated, BET-N2 specific surface area are 205m2/g and 108 m2/g for sedimentary and hydrothermal respectively. Cation exchange capability is llmeq/g and sum of adsorption water is 30% near saturation humidity for sedimentary pure palygorskite.
The structures of CuNaX zeolites with different amounts of adsorption water were determined by polycrystal X-ray diffraction. The results were refined by Rietveld method.
It is discovered that migration of Cu~(2+) ion occurs as the amount of adsorption water increases, Cu~(2+) ion migrates into supercages of zeolite when it adsorbs water saturatedly but reversibly back to S(Ⅱ) position when water adsorbed decreases.
Ag/SiO_2 nanocomposite was prepared by a new fashion of absorptionreacting technique,utilizing nanoreactor formed by adsorption water layer on SiO_2 surface.
The thermal decomposition of electroformed PbO2 showed two types of hydration water: the first type was physical adsorption water adsorbed on the surface of PbO2 particles and could be removed at low temperature, the second was chemical structural water localized within the PbO2 crystal structure and could only be removed at higher temperature.
The reduction reaction of PbO2 in lead/acid batteries was mainly controlled by diffusion process. The removal of physical adsorption water had little effect on the capacity, however, the removal of chemical structural water results in a serious loss on the capacity.
Calculated energy parameters and geometric structure of adsorption water complexes were used to interpret the abnormally small chemical shift of protons in the adsorbed water molecules previously observed in the NMR spectra.
Modeling of adsorption water complexes on the basal and lateral faces of graphite has been done using the Scheraga atom-atom potential.
Modeling of adsorption water complexes on the graphite surface using the atom-atom potential method
The adsorption water vapour isotherms were determined by TG at 303 K.
Preheating at 90°C for 12?h was found to be capable of eliminating adsorption water on sample surface.
"Copper Losing"often occurs when CuNaX zeolites with low degree of exchange is used as catalyst in petro-chemical reactions. The structures of CuNaX zeolites with different amounts of adsorption water were determined by polycrystal X-ray diffraction.The results were refined by Rietveld method. It is discovered that migration of Cu~(2+) ion occurs as the amount of adsorption water increases, Cu~(2+) ion migrates into supercages of zeolite when it adsorbs water saturatedly but reversibly back...
"Copper Losing"often occurs when CuNaX zeolites with low degree of exchange is used as catalyst in petro-chemical reactions. The structures of CuNaX zeolites with different amounts of adsorption water were determined by polycrystal X-ray diffraction.The results were refined by Rietveld method. It is discovered that migration of Cu~(2+) ion occurs as the amount of adsorption water increases, Cu~(2+) ion migrates into supercages of zeolite when it adsorbs water saturatedly but reversibly back to S(Ⅱ) position when water adsorbed decreases.The active centre of the said catalyst is Cu~(2+) ion at the S (Ⅱ) position. The mechanism of "cupper losing"is that Cu~(2+) ion has migrated into supercage where it is not constrained by oxygen atoms in the framework, then it forms intermediate substance with reactant in catalytic reaction and runs away. Therefore it can be prevented by eliminating water in the reaction system as far as possible such as by calcining the zeolite before reaction, and dehydrating the reactant etc.
By use of simulation conditions of borehole, the reaction of potassium ion and K-PHP and montmorillonite and the effect of potassium chloride on borehole wall stability are studied in the paper. The results show that on conditions of 77℃, pH value of 9.23 and 7.04, staying 1-15 days and 1% KC1 concentration, the borehole wall is in steady state, because of ion exchange between potassium and clay. Potassium ion can decline adsorption water in clay, inhibite the clay dispersion and promote the adsorption...
By use of simulation conditions of borehole, the reaction of potassium ion and K-PHP and montmorillonite and the effect of potassium chloride on borehole wall stability are studied in the paper. The results show that on conditions of 77℃, pH value of 9.23 and 7.04, staying 1-15 days and 1% KC1 concentration, the borehole wall is in steady state, because of ion exchange between potassium and clay. Potassium ion can decline adsorption water in clay, inhibite the clay dispersion and promote the adsorption of polymer on clay.
In this paper. by dctcrmining the adsorption isothermal line of ettringite to water with themicroelectronic automatic hcat balance the adsorption hcats in diffcrent coverage surfaccs and the empirical constant in FreundIich adsorption isothcrmal empirical cquation F= kp' are obtained,the adsorption mechanism is probed,the threee existing adsorption forces: Iigand ficId force hydrogen bond forceand capillary condensation force are given and the laws of adsorption water in ettringite are revealed.Thesc results...
In this paper. by dctcrmining the adsorption isothermal line of ettringite to water with themicroelectronic automatic hcat balance the adsorption hcats in diffcrent coverage surfaccs and the empirical constant in FreundIich adsorption isothcrmal empirical cquation F= kp' are obtained,the adsorption mechanism is probed,the threee existing adsorption forces: Iigand ficId force hydrogen bond forceand capillary condensation force are given and the laws of adsorption water in ettringite are revealed.Thesc results will help the thorough study on ettringite stability.
adsorption water
吸附水
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