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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. 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]. |
3. 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 |
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