Catalyst diamond lattice structure and electronic structure and the relationship between catalytic activity
Process Lattice geometry to adapt to the principle: the geometric structure and catalytic character of the lattice of graphite reactant geometry to adapt. Catalysts used in synthetic diamond,
mac cosmetics wholesale, requiring intensive face-centered cubic or hexagonal close-packed lattice spacing of graphite surface structure of the atom fit, the best is equal to 0.246r ~ n. Principle is that the two liquid crystal layer under a number of catalytic mechanism of adsorption of an ideal catalyst for the diamond structure requirements. According to j =. The above principle, the catalytic process of transformation of graphite to diamond, all natural metal catalysts, the best nickel, followed by cobalt. Two similar catalytic activity, can be used as a catalyst alone. While other metals because they can not adapt well to meet the two principles of the shame. Such as platinum, and nickel are similar electronic structure (see Table 1), more in line with requirements; but the geometry is too large (see Table 2),
uggs nederland, is not conducive to a number of simultaneous adsorption, so the catalytic effect of platinum worse than the nickel. This point has been confirmed by practice. After a theoretical analysis of the above understanding, in line with international diamond industry in Taiwan into actual production. Here are a few most obvious example: Example 1 is well known that the growth of the world's most advanced diamond gem GE's technology is pure nickel as catalyst. Example 2 diamond Russia and other CIS countries produce nickel-based catalyst has been used, such as NiMn alloy. Example 3 Synthesis of the domestic diamond industry is the most widely used nickel-based catalyst Taijin, such as NiMnCo25-5, Ni. MnFe30-30. As no pure nickel and gold with manganese homes, mainly in order to reduce the station into a temperature. Addition of other ingredients can be adjusted Taijin the electronic structure and lattice structure, so that more desirable than a single metal. SDA line down 4DeBeers diamond products company is the production of cobalt as a catalyst, which shows also regarded as a good catalyst drilling. However, we also noted that after the acquisition of Winter Corporation, DeBeers will now also be used in the production of nickel-based alloy catalyst grades of products for the DSN the structure of the ideal catalyst requirements (electronic structure and the lattice structure) is described above. natural single best nickel metal. It's very good geometric factors, is very close to the ideal value (△ d = 0.248-0246:0 .002 nt ~ 1); electronic factors (energy factor) is also ideal, very close to the ideal value (372-364 = 8kJ,
ugg milano, too1). theory and practice have shown that a better catalyst than nickel alloy only depends on artificial manufacturing. Fortunately, through the various elements of the appropriate set of units, the ideal catalyst alloy is possible to develop out of the development of a commonly used than the current more desirable NiMnCo25-5 catalyst is possible. in the development of more ideal alloy catalysts work,
Moncler cheap, the future should pay attention to electronic structure factor. now several alloy catalysts commonly used in China too the lack of d with d of the hole number and percentage of other electronic structure data,
uggs online bestllen, it must first carry out basic research to fill this area blank, so far as to determine whether the electronic structure of the catalyst Taijin adaptation principles, and quantitatively compare the extent of their compliance. References A.Giini.The? m ~ iemMineral0.19621oA.JhH.
I43a.AHCCCP (He.M Shuai ) .1968 H. P. Bove ~ kerk.Nature】 959RH.w coffee, dv.ChemPh, 1965.Bepeam 'uH, mHCCCP, l965P.b nL ~ 'E'TWbIeJ ~' IILTLIII:, I1980 Xing Yuan-Long and so on. from the sintering mechanism of the growth of hard wood shake Luo Abstract bats in the operation set of arguments prince Yu Lu silicate crystal growth study odd members,] 980 Lin Ming-West and so on. Lo } [8] Jilin go school. artificial barrier diamond Science Press.] 975 He Fucheng and so on. Results chair of chemical People's Education Press,】 982 [Japanese] Tachibana Taro such as liquid crystal knowledge. Science Press,] '984 Fudan go Science. Special Physical and Chemical (CHINA) China Education Publishing House .1979 Liu Po and so on. flails of Physical and Chemical (CHINA) China Education Press, 1964 Journal of the Lord. the same [8] Wang Fengsheng of Public Abstract bats. Metal-Catalyzed Hui c music station the relationship between structure and catalytic activity of all state machines designed (first issue) l985lIk-e ~ 0,.] YSN ... l998 (Received Date: l999-0l-lO1c Editor: Wang Qin) 23456789m ¨ refuse H
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