TAN Jun, OUYANG Yuxia, SUN Ping, et al. Density functional theory study on disproportionation reaction of methylchlorosilane azeotrope byproducts catalyzed by AlCl3[J]. CIESC Journal, 2015, (5): 1730-1737. DOI: 10.11949/j.issn.0438-1157.20141522.
TAN Jun, OUYANG Yuxia, SUN Ping, et al. Density functional theory study on disproportionation reaction of methylchlorosilane azeotrope byproducts catalyzed by AlCl3[J]. CIESC Journal, 2015, (5): 1730-1737. DOI: 10.11949/j.issn.0438-1157.20141522.DOI:
The disproportionation reaction between (CH3)3SiCl and SiCl4 catalyzed by AlCl3 involves three reactions; the reaction between (CH3)3SiCl and SiCl4 to form (CH3)2SiCl2 and CH3SiCl3 (R1)
the reaction between (CH3)2SiCl2 and SiCl4 to form CH3SiCl3(R2) and the reaction between (CH3)3SiCl and CH3SiCl3 to form (CH3)2SiCl2(R3). Density functional theory was used to study these reactions. The possible catalytic mechanisms of AlCl3 were stepwise reaction pathway of forming intermediate CH3AlCl2 and co-adsorption pathway of two reactants on AlCl3. The co-adsorption mechanism was more likely for these three reactions. The energy barrier ranking of these reactions was R2 >R1 >R3. By analyzing the thermodynamics data of these reactions
the effect of temperature on the Gibbs reaction energy of R2 was almost negligible within a temperature range of 543.15 K to 593.15 K. However
the Gibbs reaction energy of R1 and R3 significantly decreased at 593.15 K. These studies indicated that through appropriate temperature regulation
the reactions of R1 and R3 could be the dominant reactions while R2 would be effectively suppressed
influencing product distribution and facilitating formation of (CH3)2SiCl2.