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1. Selective Ethylene Oligomerization with Chromium-based Metal-Organic Framework MIL-100 Evacuated under Different Temperatures | |||
HAN Yang,ZHANG Ying,LIU Suyan,FENG Guangliang,GAO Fei,WANG Hui | |||
Chemical Engineering 08 October 2016 | |||
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Abstract:MIL-100(Cr) was synthesized and evacuated under different temperatures to generate a series of Cr-based heterogeneous catalysts for ethylene slurry oligomerization. Their crystal structures, pore properties and metal oxidation states were characterized by XRD, N-adsorption/desorption and XPS techniques. These catalysts showed moderate catalytic activities for ethylene oligomerization but high selectivities to low carbon olefins C6, C8 and C10. Moreover, the oligomer distributions were different depending on the evacuation temperatures. The XPS results showed that the increase of evacuation temperature below 350 oC caused the reduction of some CrIII active sites in the MIL-100(Cr) structure to CrII active sites, which made the catalytic behavior switch from oligomerization to oligomerization plus polymerization activities. The MIL-100(Cr)-250 catalyst evacuated at 250 oC exhibited the largest BET surface area of 2348 m2og-1 and the highest oligomerization and polymerization activities up to 9.27×105 g/(molCroh) and 0.99×105 g/(molCroh) respectively. The main oligomerization products were low carbon olefins C6, C8 and C10. The by-product polymer from MIL-100(Cr)-250 was also characterized in detail by various techniques. It was found that the polymer belonged to linear polyethylene with ultrahigh molecular weight and broad molecular weight distributions. This work demonstrated that MOFs containing coordinatively unsaturated metal sites might be a promising selective catalyst for ethylene slurry oligomerization. | |||
TO cite this article:HAN Yang,ZHANG Ying,LIU Suyan, et al. Selective Ethylene Oligomerization with Chromium-based Metal-Organic Framework MIL-100 Evacuated under Different Temperatures[OL].[ 8 October 2016] http://en.paper.edu.cn/en_releasepaper/content/4706439 |
2. Preparation of Ceramic Foams and the Application in Hydrogenation of Commercial Polystyrene | |||
HAN Kaiyue,ZUO Haoran,ZHU Zhenwei,MENG Chen,GUO Wenze,CAO Guiping | |||
Chemical Engineering 14 February 2015 | |||
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Abstract:Polystyrene hydrogenation is an important post-polymerization process with good market prospects. However, the traditional powder catalysts are not suitable for industrialized process. In this paper, the macroporous ceramic foams (CFs) were prepared using synthetic template replica method. In order to obtain the ceramic foams with three-dimensional networks and good mechanical properties, a uniform design was carried out to optimize the composition of the slurry and calcining conditions, including the contents of H2O, binder, calcining temperature, heating rate, and calcining time. Effects of the rheological behavior of the slurry on the strength, porosity, and microstructure of the CFs were investigated in details. The obtained ceramic foam catalysts facilitated the separation of catalyst from solution and exhibited good catalytic activity. | |||
TO cite this article:HAN Kaiyue,ZUO Haoran,ZHU Zhenwei, et al. Preparation of Ceramic Foams and the Application in Hydrogenation of Commercial Polystyrene[OL].[14 February 2015] http://en.paper.edu.cn/en_releasepaper/content/4632382 |
3. Confined Synthesis of Silicalite-1 Hollow Spheres with a Lamellar Shell | |||
CHEN Huiyong | |||
Chemical Engineering 09 August 2014 | |||
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Abstract:A novel synthesis strategy with integrated using soft/hard templates was proposed for the confined synthesis of silicalite-1 hollow spheres with a lamellar shell. Replicated from macroporous carbon templates and directed by multi-quaternary ammonium surfactants, the silicalite-1 spheres demonstrated unique hollow nanoshell morphology, high crystallinity, and novel hierarchical porosity consisted of hollow macropores, interlamellar mesopores and ordered micropores in zeolites. | |||
TO cite this article:CHEN Huiyong. Confined Synthesis of Silicalite-1 Hollow Spheres with a Lamellar Shell[J]. |
4. Study on the Cu species over chlorine-free CuY catalyst for oxidative carbonylation of methanol to dimethyl carbonate | |||
Zheng Huayan,Wang Jiazhen,Li Zhong | |||
Chemical Engineering 17 December 2013 | |||
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Abstract:Three different preparation methods: liquid-phase ion exchange, incipient-wetness- impregnation and the novel method adopted by firstly ion exchange together with Cu(NO3)2- impregnated, are employed to prepare the CuHY catalysts, which are applied in oxidative carbonylation of methanol to dimethyl carbonate (DMC). Characterization of samples by XRD, H2-TPR, DIRFTS of CO adsorption, XPS, AAS and TEM, reveal that the catalyst prepared by liquid-phase ion exchange exhibits low catalytic activity because of the low content of copper and most of Cu species located in the sodalite units or hexagonal prisms, which are difficult to contact with reagent CO and O2. Dispersion of crystalline CuO is the main Cu species of the catalyst prepared by incipient-wetness-impregnation, while 30 percent of Cu2+ of the total amount of Cu is located in the sodalite units or hexagonal prisms, which is not helpful for catalytic activity. However, the catalyst, which is prepared by the novel method, exhibits the remarkable advantages that covers both preparation methods of liquid-phase ion exchange and incipient-wetness-impregnation. This novel method not only obtains CuO species that is beneficial to oxidative carbonylation of methanol to DMC, but also adjusts the location of Cu ions, which makes more Cu2+ locate in the supercages, as a result, Cu2+ can contact with CO and O2. Moreover, Cu2+ located in the supercages have shown the better catalytic performance for oxidative carbonylation compared with CuO species on the surface of the Y zeolites. | |||
TO cite this article:Zheng Huayan,Wang Jiazhen,Li Zhong. Study on the Cu species over chlorine-free CuY catalyst for oxidative carbonylation of methanol to dimethyl carbonate[OL].[17 December 2013] http://en.paper.edu.cn/en_releasepaper/content/4576209 |
5. The HI catalytic decomposition in the lab-scale H2 production apparatus of the iodine-sulfur thermochemical cycle | |||
WANG Laijun,WANG Zhichao,ZHANG Ping,CHEN Songzhe,XU Jingming | |||
Chemical Engineering 21 April 2011 | |||
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Abstract:The decomposition of HI is the key reaction to produce hydrogen in the Iodine-Sulfur thermochemical hydrogen production cycle (IS cycle). In this paper, the HI catalytic decomposition for the lab-scale H2 producing apparatus of IS-10 (H2 production rate is 10 L/h) was studied. The effects of different supports (carbon nanotubes, active carbon, carbon molecular sieve, graphite and Al2O3), catalyst particle sizes, and temperature on HI decomposition were investigated. Also, the fresh and used catalysts were characterized by XRD and BET. The results showed that the active carbon and carbon molecular sieve had the higher catalytic activity for HI decomposition than other supports. The active carbon was selected to support platinum to catalyze the HI decomposition in the IS-10. In the closed cycle operation, the conversion of HI over the active carbon supported platinum catalyst was more than 20 %, which was near the thermodynamic equilibrium value. The H2 production rate was about 10 L/h, which reached the designed value. The results of the characterization about the fresh and used catalysts indicated that the specific surface area decreased and the Pt particles size increased, which showed the stability of the catalyst should be improved. | |||
TO cite this article:WANG Laijun,WANG Zhichao,ZHANG Ping, et al. The HI catalytic decomposition in the lab-scale H2 production apparatus of the iodine-sulfur thermochemical cycle[OL].[21 April 2011] http://en.paper.edu.cn/en_releasepaper/content/4423559 |
6. Catalytic hydrogen iodide decomposition over carbon nanotubes supported Pt catalysts | |||
WANG Laijun,ZHANG Ping,WANG Zhichao,CHEN Songzhe,XU Jingming,CHEN Jing | |||
Chemical Engineering 12 March 2011 | |||
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Abstract:Two kinds of Pt catalysts supported on carbon nanotubes (CNTs) were prepared by the electroless plating method and the impregnation-reduction method. Their catalytic activities were evaluated through hydrogen iodide decomposition in a fixed bed reactor under atmospheric pressure. The catalysts were characterized by XRD、BET and TEM, respectively. The results indicated that the CNTs supported Pt catalyst prepared by the electroless plating method had the higher activity for hydrogen iodide decomposition than that prepared by the impregnation-reduction method, because of the higher dispersion of the platinum nano-particles on the CNTs support. | |||
TO cite this article:WANG Laijun,ZHANG Ping,WANG Zhichao, et al. Catalytic hydrogen iodide decomposition over carbon nanotubes supported Pt catalysts[OL].[12 March 2011] http://en.paper.edu.cn/en_releasepaper/content/4416054 |
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