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Baolei Du,Hongjiu Su,Shudong Wang 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
Carbon nanofiber (CNF) coated monoliths with a homogeneous and consistent layer were prepared bycatalytic decomposition of ethane on Ni particles, and the CNF coated monolith supports were oxidizedusing different agents to get different oxidation degrees. The as-prepared catalysts were characterized bySEM, TG, Raman spectra, FT-IR, TPD, TPR, CO pulsar and TEM, while the behavior of Pd supported on CNFcoated monoliths were tested by liquid phase of nitrobenzene hydrogenation in a continuous flowreactor. For comparison Pd/Al2O3/cordierite was also prepared. It was found that the reductiontemperature controlled Pd dispersion, which in turn was responsible for the catalytic activity. A goodlinear relationship between nitrobenzene conversion and Pd dispersion was observed. Furthermore, Pd/CNF/cordierite showed higher nitrobenzene conversion compared with Pd/Al2O3/cordierite, indicatingCNF was a superior support. The aniline selectivity was related to the amount of surface oxygen groups(SOCs) formed during the oxidation pre-treatment. SOCs, especially carboxylic acid groups, increased asthe degree of oxidation deepened, and more amounts of SOCs on CNF surface were responsible for thelower aniline selectivity.
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Min Su,Hongjiu Su,Baolei Du,Xiaotong Li,Gaoyuan Ren,Shudong Wang 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.5
Silica nanoparticles with different sizes (ranging from 10 nm to 104 nm) and size distributions were synthesized by semi-batch and semi-batch/batch methods of the Stöber process. Then the amorphous silica with different surface areas (ranging from 30m2/g to 400m2/g) and pores (ranging from 3 nm to 33 nm) were obtained by various aging treatments and drying methods of the synthesized colloidal silica sol. The aging treatment resulted in the monodispersed pore distribution and decreased BET surface area of silica. The high-humidity drying method led to the mesoporous silica with uniform pores and decreased small pores. As the silica was obtained by the arrangement of silica nanoparticles, the pore diameter and pore distribution of mesoporous silica were directly related to the size and distribution of nanoparticles. Furthermore, this study offered a new thought for the synthesis of other mesoporous materials with uniform pore distributions.
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