【摘要】 利用连续流动微反研究了Rh+Co/Al₂O₃催化剂的CO加氢反应.结果表明反应在220℃以上发生.反应活性随温度的升高和H₂/CO值的增加而增加.利用TP-IR动态方法研究了Rh+Co/Al₂₃上CO和H₂共吸附及其动态行为.结果表明在Rh+Co/Al₂O₃的孪生及线式中心上,CO和H₂室温共吸附时即有部分孪生及线式CO转化为相应的羰基氢化物.随温度的升高,剩余的孪生和线式CO继续向相应的羰基氢化物转化.而羰基氢化物则向多氢羰基氢化物转化.在到达反应温度之前,催化剂表面只存在羰基氢化物及相应的多氢羰基氢化物.在反应温度则导致产物CH₄生成.与CO加氢反应和CO歧化的吸附态研究结果相关联,作者认为在Rh+Co/Al₂O3上CO加氢生成CH₄是经由羰基氢化物-多氢羰基氢化物途径.更多还原

【Abstract】 CD hydrogenation of Rh + Co/Al2O3 has been studied by using a flow micro - reactor.CO hydrogenation took place over 220℃ and reaction activity increased with the reaction temperature and H2/CO ratio. Coadsorption of CO and H2 as well as dynamic behavior of coadsorbed CO and H2 have been investigated by TP - IR dynamic method. The results indicatethat in coadsorption of CO and H2 at 20℃ ,gem - dicarbonyl CO and linear CO transformed partly into the corresponding carbonyl hydride. With increasing the temperature, the residual gem -dicarbonyl CO and linear CO transformed also into the corresponding carbonyl hydride, while the carbonyl hydrides transformed into the multi - hydrogen carbonyl hydrides. Before arriving at the reaction temperature, there are only the carbonyl hydrides and the multi - hydrogen carbonyl hydride which led to the formation of CH4 at the reaction temperature on the surface of Rh + Co/Al2O3. To relate these results with the results obtained in CO hydrogenation and in CO disproportionation. We believe that in CO hydrogenation reaction, the scission of C-O bond is via the carbonyl hydride - multihydrogen carbonyl hydride.更多还原