摘要：
A series of hierarchical mesoporous ZSM-5 zeolites with different morphology were successfully synthesized by the CO2-in-water microemulsion method, and mesoporosity was formed without organotemplate. The different synthesis conditions, including silica alumina molar ratio, stirring time and compressed CO2 pressure, were systematically investigated to discuss the influence of these conditions on the morphology of ZSM-5 zeolite. The resulting samples were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), inductively coupled plasma (ICP) and nitrogen adsorption-desorption measurement. XRD results indicated that compressed CO2 route for the synthesis of MFI zeolites had a fast crystallization rate and good crystallinity. SEM images showed that the ZSM-5 hierarchical mesoporous ZSM-5 zeolite had a uniform chain-like crystal morphology, whereas silicalite-1 displayed a monodisperse crystal morphology. In addition, the nitrogen adsorption-desorption measurement provided sufficient evidence for the presence of hierarchical mesopores in ZSM-5 zeolite.
作者机构：
[Tu, Xiangchen; Dan, Weiyi; Jia, Kuile; Li, Jianfen] School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan, Hubei, 430023, China
通讯机构：
[Li, J.] S;School of Chemical and Environmental Engineering, Wuhan, Hubei, 430023, China
会议名称：
2012 2nd International Conference on Management, Manufacturing and Materials Engineering, ICMMM 2012
会议时间：
September 21, 2012 - September 23, 2012
会议地点：
Beijing, China
会议主办单位：
(1) School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan, Hubei, 430023, China
摘要：
NiO nanoparticles were successfully prepared by decomposing the predecessor bis(glycinato)nickel(II)dihydrate in the presence of oleylamine and triphenylphosphine (TPP), and different approaches including Fourier transforms infrared spectrometry(FT-IR), X-ray diffraction(XRD) and transmission electron microscopy (TEM) were used to characterize the NiO nanoparticles. Meanwhile, the effects of TPP concentration and reaction time on the size and yield of NiO nanoparticles derived from precursors were thoroughly investigated in this paper. The analysis results indicated that the prepared NiO nanoparticles were found spherical in shape and demonstrated weak agglomeration. They had generally high purity and a fine crystal phase of cubic syngony. Furthermore, the effects of the TPP concentration and reaction time on the size and yield of NiO nanoparticles are very crucial, higher concentration of TPP would results in reduction of both the mean size and yield of NiO particles. However both yields and particles size of NiO nanoparticles continuously increased as increasing reaction time, after more than 60 minutes, the size and yield of NiO nanoparticles kept hardly change.
摘要：
For the purpose of developing an effective Fe2O3-doped nickel-based catalysts to be used in biomass gasification, Fe2O3 nanoparticles were prepared by homogeneous precipitation method involving an aqueous solution of Fe (NO3)3·9H2O and urea as precipitator. Different approaches, such as XRD and SEM, were used to characterize the products. Meanwhile, the effects of various technical parameters in preparation process on the yield of products were investigated, and optimal conditions for preparing Fe2O3 nanoparticles were found as follows: the molar ratio of urea to Fe (NO3)3·9H2O for 5:1, temperature of precipitation reaction for 125°C, concentration of iron salt for 0.20mol/L. The Fe2O3 nanoparticles prepared under the optimal conditions were spherical in shape and well dispersed; they had high purity and a fine crystal phase of cubic syngony with a mean particle size of about 28nm.
摘要：
<jats:p>For the purpose of developing a novel and effective nano-CeO<jats:sub>2</jats:sub>catalyst used in biomass gasification for tar removal, nanocrystalline CeO<jats:sub>2</jats:sub>particles were successfully prepared by the homogeneous precipitation method, and different approaches including TG, FT-IR, XRD and SEM were used to characterize the CeO<jats:sub>2</jats:sub>nano-particles and precursors in this study. The analysis results indicated that the synthesized precursor was hydrated cerium basic carbonates and its formula was identified as Ce<jats:sub>2</jats:sub>O(CO<jats:sub>3</jats:sub>)<jats:sub>2</jats:sub>•nH<jats:sub>2</jats:sub>O, and it can completely transform into nanocrystalline CeO<jats:sub>2</jats:sub>particles below 400 °C under the air atmosphere. The prepared CeO<jats:sub>2</jats:sub>nano-particles were found spherical in shape and well dispersed; they had high purity and a fine crystal phase of cubic syngony structure with a mean size of 13 nm.</jats:p>
摘要：
This paper dissertated the cultivation status and existing problems of innovation talents for applied chemistry specialty, and introduced the cultivation approach of innovation talent and the proposition of teaching reform for applied chemistry speciality. Meantime, combined with practical conditions in our university, the concrete measures and means for implementing teaching reform and training innovation talents of applied chemistry speciality were investigated. A series of measures such as reform of teaching plan, updating the experimental teaching contents, strengthening the practice teaching, and establishing the innovation base and practice base were adopted to encourage students for innovation, the purpose is to cultivate students' comprehensive quality and the innovative ability, and construct cultivation mode of innovation talents for applied chemistry specialty.
作者机构：
Department of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan 430023 Chi;Institute of Environmental Science and Engineering, Nanyang Technological University, Innovation Cen;School of Environmental Science & Engineering, Huazhong University of Science and Technology, Wuhan,
会议名称：
第六届煤燃烧国际会议(The 6th International Symposium on Coal Combustion)
会议时间：
2007-12-01
会议地点：
武汉
会议论文集名称：
第六届煤燃烧国际会议(The 6th International Symposium on Coal Combustion)论文集
摘要：
The objective of this study is to develop a novel supported nano-NiO catalysts for tar removal in biomass gasification/pyrolysis, to significantly enhance the quality of the produced gases. For this purpose, the supported nano-NiO/γ-Al2O3 catalyst was prepared by deposition-precipitation (DP) method. Different analytical approaches such as XRD, BET, TEM and SEM/EDX were used to characterize the synthesized catalysts. The results showed that the prepared nano-NiO/γ-Al2O3 catalysts had an egg-shell structure with a loading of NiO in catalysts over 12 wt ％, and they had also a higher BET surface area over commercial nickel based catalysts. The active components of catalyst were spherical NiO nanoparticles coated on the surface of supports with a size range of 12～18 nm. Furthermore, the activity of the catalysts to remove tar in the process of biomass pyrolysis was also investigated using a bench-scale combined fixed bed reactor. The experiments demonstrated that the tar yield after adding catalysis was reduced significantly. The tar removal efficiency reached to 99％ for catalytic pyrolysis at 800℃, while the gas yield after adding catalysis increased markedly. Meanwhile, the compositions of gas products before and after adding catalysis in the process also changed significantly. The percentages of CO2 and CH4 in the product gas after addign catalysis were obviously reduced whilst those of the valuable H2 and CO increased sharply. Therefore, using the prepared NiO/γ-Al2O3 catalyst in biomass gasification/pyrolysis can improve significantly the quality of the produced gas and meanwhile eliminate efficiently the tar generation.
摘要：
The air–steam catalytic gasification of rice husk for hydrogen-rich gas production was experimentally investigated in a combined fixed bed reactor with the newly developed nano-NiO/γ-Al2O3 catalyst. A series of experiments have been performed to explore the effects of catalyst presence, catalytic reactor temperature, the equivalence ratio (ER), and steam to biomass ratio (S/B) on the composition and yield of gasification gases. The experiments demonstrated that the developed nano-NiO/γ-Al2O3 catalyst had a high activity of cracking tar and hydrocarbons, upgrading the gas quality, as well as yielding a high hydrogen production. Catalytic temperature was crucial for the overall gasification process, a higher temperature contributed to more hydrogen production and gas yield. Varying ER demonstrated complex effects on rice husk gasification and an optimal value of 0.22 was found in the present study. Compared with biomass catalytic gasification under air only, the introduction of steam improved the gas quality and yield. The steam/biomass ratio of 1.33 was found as the optimum operating condition in the air–steam catalytic gasification.
