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ƪÃû£ºOn the formation of methane and hydrogen during cracking of alkanes Journal of Molecular Catalysis Volume 32, Issue 3, 15 August 1985, Pages 365-375 ÕâÆªÎÄÕÂËÓа¡£¬Ñ§Ð£Í¼Êé¹ÝûÓÐÈ«ÎÄ¡£Òªµç×Ӱ棬»òÕßɨÃèºóµÄ°æ±¾¶¼¿ÉÒÔ£¬È«ÎÄŶ£¬ ллÀ² [ Last edited by huxy3321 on 2008-11-15 at 09:47 ] |
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huxy3321
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4Â¥2008-11-15 10:14:41
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huxy3321(½ð±Ò+1,VIP+0):ËäÈ»²»ÊÇÈ«ÎÄ£¬ÒÀ¾É±íʾ¸Ðл
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Abstract A qualitative explanation of the low dehydrogenation/cracking ratio observed in reactions with long-chain n-alkanes catalyzed by superacids is attempted via calculation of the MINDO/3 reaction profiles for the complete dehydrogenation intermolecular interconversion cracking (D.I.C.) set of unimolecular processes that a protonated n-alkane can undergo. It is shown that the three simplest systems can suitably model all possible D.I.C. surfaces that can be found in a long-chain linear alkane. The importance of the primary protonation site in the distribution of products is discussed. Some experimental results from cracking of n-heptane over a set of acid zeolites are used, together with those of this theoretical study, to show that a recent controversy about the presence of methane and hydrogen as primary or secondary products in saturated alkane cracking catalyzed by zeolites can be settled. ºÇºÇ£¬Ö»ÕÒµ½ÕªÒª |
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