• DONGFANG WU

      Articles written in Journal of Chemical Sciences

    • Synthesis of well-ordered MCM-41 containing highly-dispersed NiO nanoparticles and efficient catalytic epoxidation of styrene

      KAI HUANG ZHILI WANG DONGFANG WU

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      Well-ordered MCM-41 materials with different loadings of NiO were prepared combining hydrothermal method using cetyltrimethylammonia bromide as the structure-directing agent in an ammonia aqueous solution with calcination. A series of characterization of the resulting samples revealed that the materialsmaintained ordered mesostructure of MCM-41 after loading NiO and NiO nanoparticles were highly dispersed in the mesoporous wall and on the external surface of MCM-41. Characterization results also unveiled that Ni2+ prefer to enter the pores that formed by silicone gel during the hydrothermal reaction and incorporated into the pore wall and then formed NiO during the calcination process. And the TEM images indicated that smaller size NiO nanoparticles are easier to be formed on the MCM-41 materials. Catalytic results revealed that NiO should be the catalytic active centers for the oxidation of styrene and Ni-based materials showed the efficient catalytic property.

    • Catalytic properties of SmMnO3/cordierite monolithic catalysts: acid treatment and calcination process optimization using response surface methodology

      LEI BAO DONGFANG WU

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      This work focuses on the optimization of the acid treatment and calcination process factorsaffecting the catalytic performance of the SmMnO3/cordierite monolithic catalyst for o-xylene oxidation,using response surface methodology (RSM) analysis. A central composite rotatable design (CCRD) was usedto statistically visualize the complex interactions of acid treatment time, acid concentration, calcination temperature, and calcination time for T50 and T90 values. And the validity of the models developed wasverified by experiments. Statistics showed the most significant process factor which affects catalytic combustion activity is acid treatment time. It is also shown that the catalytic activity increases with increasing acid treatment time or acid concentration and that a moderate calcination temperature or time is required toincrease the catalytic activity. Furthermore, it was found through SEM analysis that the acid treatmentprocess significantly impacts the morphology of the SmMnO3/cordierite monolithic catalysts. Thus, RSM isan effective technique for estimating the catalytic activity of monolithic catalysts.

      In this work, the effects of acid treatment and calcination process on the catalytic performance of SmMnO3/cordierite monolithic catalyst for o-xylene oxidation were based on response surface methodology (RSM) through presenting a mathematical modeling and factorial analysis.

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