Exchange reactions of alkanes containing quaternary carbon atoms over supported metal catalysts
作者:Ronald Brown、Charles Kemball
DOI:10.1039/f19898502159
日期:——
3-tetramethylbutane (TMB) and 2,2,4,4-tetramethylpentane (TMP) over supported catalysts containing iridium, palladium, platinum or rhodium at temperatures in the neighbourhood of 400 K. Reactions were followed mass-spectrometrically and products were also examined by deuterium n.m.r. spectroscopy. Four processes or mechanisms were found to contribute to different extents with the various hydrocarbon–metal systems
比较了在负载型催化剂上与2,2-二甲基丙烷(DMP),2,2,3,3-四甲基丁烷(TMB)和2,2,4,4-四甲基戊烷(TMP)与氘的交换反应铱,钯,铂或铑在约400 K的温度下进行。质谱进行反应追踪,并通过氘核磁共振光谱法检查产物。发现四种过程或机制在各种碳氢化合物金属系统中有不同程度的贡献。这些是(I)逐步交换,(II)甲基交换,以及更一般的涉及(III)吸附了αγ的中间体或(IV)吸附了αδ的中间体的多重交换。观察到一些TMP异构化与TMP-铑系统交换同时发生。