CAJ | 학술논문

以 Pd/Al2O3/堇青石为催化剂，硝基苯与氢气为原料，系统地考察了氧化铝涂层的上载量、氢气流速、反应温度以及液体空速对硝基苯气液固三相加氢反应的影响规律。结果表明：较高的涂层上载量能产生较大的Pd颗粒，而在较大的Pd颗粒上反应的活性较高；氢气流速对反应并无明显的影响，表明反应器内的流型处于膜状流；反应的表观活化能为6.1 kJ/mol，显示外扩散过程对反应的影响很大；硝基苯转化率随着液体空速的增加而不断下降，通过计算不同液相空速时的总传质系数，并与硝基苯的转化率进行关联，发现总传质系数与硝基苯转化率呈良好的线性关系。
이 Pd/Al2O3/근청석위최화제，초기분여경기위원료，계통지고찰료양화려도층적상재량、경기류속、반응온도이급액체공속대초기분기액고삼상가경반응적영향규률。결과표명：교고적도층상재량능산생교대적Pd과립，이재교대적Pd과립상반응적활성교고；경기류속대반응병무명현적영향，표명반응기내적류형처우막상류；반응적표관활화능위6.1 kJ/mol，현시외확산과정대반응적영향흔대；초기분전화솔수착액체공속적증가이불단하강，통과계산불동액상공속시적총전질계수，병여초기분적전화솔진행관련，발현총전질계수여초기분전화솔정량호적선성관계。
Three-phase hydrogenation of nitrobenzene was carried out in a continuous flow reactor. The effects of the layer loading, the H2 flow rate, the reaction temperature and the liquid hourly space velocity (LHSV) were investigated. It was observed that Pd dispersion decreased with the increase of layer loading, while a higher nitrobenzene activity was obtained over larger Pd particles; the conversion was not affected by gas flow rate, which showed that the flow pattern was in film flow regime; the apparent activation energy was 6.1 kJ/mol, indicating the external mass transfer couldn’t be neglected; the nitrobenzene conversion decreased with the increase ofLHSV, and a good linear relationship between the conversion and the overall mass transfer coefficient was observed.