Preferential formation of 1-butene as a precursor of 2-butene in the induction period of ethene homologation reaction on reduced MoO3/SiO2 catalyst

摘要

Ethene homologation reaction to give propene (3C(2)H(4) -> 2C(3)H(6)) was examined on reduced molybdena silica (MoO3/SiO2) catalyst at initial ethene pressure around 14.66 kPa (110 mmHg) and a temperature of 30 degrees C. In the very first stage of the ethene homologation reaction, induction period was observed as well as previous results reported in the references. During the induction period, ethene dimerization providing 1-butene was preferentially occurred. In addition, it was indicated that isomerization of 1-butene to 2-butene was retarded by the presence of excess ethene as a raw material. Therefore, it might be considered that the induction period of the ethene homologation reaction on the reduced MoO3/SiO2 catalyst might be caused by insufficiency of 2-butene to promote reverse propene metathesis (CH2=CH2+CH3-CH=CH-CH3 -> 2CH(2)=CH-CH3).