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1.¸ù¾ÝArrhenius¹«Ê½[8]K=Aexp(−Ea/RT)Á½±ßÈ¡¶ÔÊý¿ÉµÃ£¬lgK=lgA−Ea/RTlge¡£Ê½ÖУºAΪƵÂÊÒò×Ó£¬EaΪ±í¹Û»î»¯ÄÜ£¬RΪĦ¶ûÆøÌå³£Êý£¬TΪÈÈÁ¦Ñ§Î¶ȡ£ÓÉͼ4¿ÉÒÔÇóµÃ²»Í¬Î¶ÈϽþ³ö·´Ó¦µÄËÙÂʳ£ÊýK¡£ÓÃlgK-1/T×÷ͼ(Èçͼ7Ëùʾ)



2.ÓÉͼ8¿ÉµÃÖ±ÏßµÄбÂÊΪ-0.18817£¬½Ø¾àΪ-0.25774¡£¼ÆËãµÃ£ºEa=8.5166kJ/mol£¬A=0.7485¡£½«ÒÔÉÏËùµÃµÄ²ÎÊý´úÈëArrhenius¹«Ê½ºÍ¹ÌĤÄÚÀ©É¢¿ØÖÆ·½³Ì¿ÉµÃºê¹Û¶¯Á¦Ñ§·½³Ì¾ßÌå±í´ïʽΪ1−2/3x−(1−x)2/3=[0.7485exp(-963.53/T)]t

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phyweiw

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С¼×009(½ð±Ò+60,VIP+0):thanks 1-22 18:02
1.¸ù¾ÝArrhenius¹«Ê½[8]K=Aexp(−Ea/RT)Á½±ßÈ¡¶ÔÊý¿ÉµÃ£¬lgK=lgA−Ea/RTlge¡£Ê½ÖУºAΪƵÂÊÒò×Ó£¬EaΪ±í¹Û»î»¯ÄÜ£¬RΪĦ¶ûÆøÌå³£Êý£¬TΪÈÈÁ¦Ñ§Î¶ȡ£ÓÉͼ4¿ÉÒÔÇóµÃ²»Í¬Î¶ÈϽþ³ö·´Ó¦µÄËÙÂʳ£ÊýK¡£ÓÃlgK-1/T×÷ͼ(Èçͼ7Ëùʾ)
Take the logarithm on both sides of the Arrhenius equation K=Aexp(−Ea/RT), where A is the frequency factor, Ea is the surface activation energy, R is the mole gas constant and T is the thermodynamic temperature. The speed constant K at different temperature can be derived in figure 4 from the lgK-1/T plot.

2.ÓÉͼ8¿ÉµÃÖ±ÏßµÄбÂÊΪ-0.18817£¬½Ø¾àΪ-0.25774¡£¼ÆËãµÃ£ºEa=8.5166kJ/mol£¬A=0.7485¡£½«ÒÔÉÏËùµÃµÄ²ÎÊý´úÈëArrhenius¹«Ê½ºÍ¹ÌĤÄÚÀ©É¢¿ØÖÆ·½³Ì¿ÉµÃºê¹Û¶¯Á¦Ñ§·½³Ì¾ßÌå±í´ïʽΪ1−2/3x−(1−x)2/3=[0.7485exp(-963.53/T)]t
It is seen that the slope of the line is -0.18817 and the intercept is -0.25774. The calculated Ea and A are Ea=8.5166kJ/mol£¬A=0.7485, respectively. The specific expression of the macro kinetic equation can be achieved as 1−2/3x−(1−x)2/3=[0.7485exp(-963.53/T)]t by substituting the derived parameters into Arrhenius equation and solid-film inner diffusion control equation.


[ Last edited by phyweiw on 2010-1-21 at 21:47 ]
2Â¥2010-01-21 21:45:52
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