At low temperature of 723 K, methane can be easily activated in the presence of ethylene in the feed, and converted to higher hydrocarbons （C2-C4） and aromatics （C6-C10）, through its reaction over rare metals modi...At low temperature of 723 K, methane can be easily activated in the presence of ethylene in the feed, and converted to higher hydrocarbons （C2-C4） and aromatics （C6-C10）, through its reaction over rare metals modified Zn/HZSM-5 zeolite catalysts without undesirable carbon oxides formation. Methane can get 37.3% conversion over the above catalysts under low temperature, and the catalysts show a longer lifetime than usual metal supported HZSM-5 zeolite catalysts without adding any rare earth metals. The effects of methane activation over various rare earth metal promoted Zn/HZSM-5 catalysts on the products and influences of several reaction conditions such as temperature, catalyst lifetime and molar ratio of CH4/C2H4 have been discussed.展开更多
The surface functions produced by adding 14 rare earth oxides in Ni/γ Al 2O 3 system were determined by BET, gas chromatography, infrared spectroscopy, XRD, SEM, X ray electronic energy spectrum etc, and research...The surface functions produced by adding 14 rare earth oxides in Ni/γ Al 2O 3 system were determined by BET, gas chromatography, infrared spectroscopy, XRD, SEM, X ray electronic energy spectrum etc, and researched contrastively. The results show that the addition of rare earth oxides changes the property of catalyst surface. It is of benefit to increasing the number of active center of the catalyst and the surface acidity of the catalyst, decreasing the surface carbon deposit during the reaction. Moreover, the addition of rare earth oxides influences the electronic state of nickel atoms on the surface directly and produces electronic effect. The effect is different for each rare earth element.展开更多
According to the latest report of Pike Research,the demand for rare earth in the new energy technology field will break the mark of 12,000 tons to reach 12,920 tons in 2017 from about 9,000 tons in 2011,indicating rap...According to the latest report of Pike Research,the demand for rare earth in the new energy technology field will break the mark of 12,000 tons to reach 12,920 tons in 2017 from about 9,000 tons in 2011,indicating rapid development of China’s rare earth hydrogen storage material industry.展开更多
基金supported by the National Natural Science Foundation of China (Grants No. 20273021)the Key Project of Shanghai Science and Technology Committee (No. 05JC14070, 06DZ05025, 0552nm042, 08JC1408600)Scientific Research Foundation of the Education Department of Heilongjiang Province (No.11544005)
文摘At low temperature of 723 K, methane can be easily activated in the presence of ethylene in the feed, and converted to higher hydrocarbons （C2-C4） and aromatics （C6-C10）, through its reaction over rare metals modified Zn/HZSM-5 zeolite catalysts without undesirable carbon oxides formation. Methane can get 37.3% conversion over the above catalysts under low temperature, and the catalysts show a longer lifetime than usual metal supported HZSM-5 zeolite catalysts without adding any rare earth metals. The effects of methane activation over various rare earth metal promoted Zn/HZSM-5 catalysts on the products and influences of several reaction conditions such as temperature, catalyst lifetime and molar ratio of CH4/C2H4 have been discussed.
文摘The surface functions produced by adding 14 rare earth oxides in Ni/γ Al 2O 3 system were determined by BET, gas chromatography, infrared spectroscopy, XRD, SEM, X ray electronic energy spectrum etc, and researched contrastively. The results show that the addition of rare earth oxides changes the property of catalyst surface. It is of benefit to increasing the number of active center of the catalyst and the surface acidity of the catalyst, decreasing the surface carbon deposit during the reaction. Moreover, the addition of rare earth oxides influences the electronic state of nickel atoms on the surface directly and produces electronic effect. The effect is different for each rare earth element.
文摘According to the latest report of Pike Research,the demand for rare earth in the new energy technology field will break the mark of 12,000 tons to reach 12,920 tons in 2017 from about 9,000 tons in 2011,indicating rapid development of China’s rare earth hydrogen storage material industry.
