Crossflow filtration of nanosized catalysts suspension using ceramic membranes
Crossflow filtration of nanosized catalysts suspension using ceramic membranes
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使用陶瓷膜错流过滤纳米催化剂悬浮液
DOI：
10.1016/j.seppur.2010.08.005
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发表时间：
2011-01
影响因子：
8.6
通讯作者：
Xu, Nanping
中科院分区：
文献类型：
--
作者：
Xing, Weihong;Zhong, Zhaoxiang;Li, Weixing;Xu, Nanping
采用陶瓷膜分离对硝基苯酚加氢制对氨基苯酚反应中的纳米镍催化剂。实验结果表明，管状陶瓷膜对镍催化剂的去除率可达100%，且对催化剂性能无不良影响。膜过滤过程中的污染阻力分析表明，膜表面滤饼层的形成是膜污染的主要机理。滤饼阻力中的意外现象被认为是由镍颗粒聚集体的尺寸和分形性质引起的。结合孔隙堵塞和滤饼过滤模型来描述随时间变化的通量下降。模型结果与实验结果吻合较好。基于模型预测确定了具有最佳孔径的合适膜，其给出了最高的稳定通量。污染膜的清洗可以通过使用强酸性溶液来实现。
Ceramic membranes were used to separate nanosized nickel catalysts from slurry in hydrogenation of p-nitrophenol to p-aminophenol. Experimental results have revealed that the tubular ceramic membranes are capable of removing nickel catalysts with an efficiency of 100% and have no adverse impacts on the performance of catalysts. The analysis of fouling resistance in membrane filtration showed that cake layer formation on membrane surface was the main fouling mechanism. The unexpected phenomenon in cake resistance was considered to arise from the size and fractal properties of the nickel particle aggregates. A combined pore blockage and cake filtration model was utilized to describe the time-dependent flux decline. The model results agreed well with those obtained experimentally. A suitable membrane with optimized pore size which gives the highest steady flux was determined based on the model prediction. The cleaning of a fouled membrane can be achieved by use of strong acidic solutions.
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