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Guiping Cao,Hui Huang,Shaohong Wang 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.9
The effect of trimethyl phosphate on Cu/Zn catalyst prepared by co-precipitation method for hydrogenation of methyl laurate to dodecanol in a slurry phase was studied using a stirred autoclave reactor system. The catalysts were characterized by means of XRD, EDS, XPS, SEM and BET. The results indicated that catalytic activity decreased with the increased amount of trimethyl phosphate. Correlating with the results from the above characterization, it was found that the main cause for the catalyst deactivation was the trimethyl phosphate occlusion of active sites by the physical adsorption and BET surface area decrement.
Hui Huang,Guiping Cao,Shaohong Wang 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.3
Deactivation of co-precipitated Cu/Zn catalyst caused by exposure to either alkylthiols or dialkyldisulfides in catalytic hydrogenation of dodecyl methyl ester to dodecanol is explored in a stirred batchreactor. Catalytic activity decrement is highly dependent on levels of poisons, types of thiols/disulfides,chain length of alkanes. XRD, EDS and XPS are employed to characterize the fresh and spent Cu/Zncatalysts. It is evident that sulfuric species prefer to attack zinc oxide, forming chemically adsorbed Zn-SR at low sulfur levels, and ZnS is formed in the highly reductive atmosphere before sulfuric speciesattacking copper (forming Cu7S4 or Cu31S16).
Effect of water on Cu/Zn catalyst for hydrogenation of fatty methyl ester to fatty alcohol
Hui Huang,Chunling Fan,Shaohong Wang,Shujia Wang,Guiping Cao 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.6
The effect of water on Cu/Zn catalyst prepared by co-precipitation for hydrogenation of methyl laurate in a slurry phase was studied using a stirred autoclave reactor system. The catalysts were characterized by means of XRD, BET, H2-TPR, SEM and TEM. The results indicate that catalytic activity decreases with increased amount of water in methyl laurate. Correlating with the results from the above characterization, it is found that the main causes for the water deactivation of the Cu/Zn catalyst were the water occlusion of active catalyst sites by the low solubility of water in the substrate and the promotion of crystal growth, as well as the Cu/Zn catalyst agglomeration in the presence of water.