XRD, Raman, TEM, and N2-adsorption were utilized to characterize CeO2/SiO2 prepared by coprecipi-tation and surfactant-assisted method. The results show that nanocrystalline CeO2 can be uniformly supported on the surf...XRD, Raman, TEM, and N2-adsorption were utilized to characterize CeO2/SiO2 prepared by coprecipi-tation and surfactant-assisted method. The results show that nanocrystalline CeO2 can be uniformly supported on the surface of SiO2 particles, when the molar ratio of Si4+/(Ce3++Si4+) is less than 35% in coprecipitation samples. At higher Si content, the surface of SiO2 can not be fully covered by CeO2. With surfactant (CTAB) added, the u-iformly supported structure can even exist when the molar ratio of Si4+/(Ce3++Si4+) is as high as 53%. It is because Ce and Si complexes can be well dispersed in precursor solution in present of CTAB. However, the uniformly supported structure can not be synthesised through surfactant-assisted approch for its hydrothermal threatment, which can easily lead to separate aggregation of nanocrystalline CeO2 and SiO2 particles.展开更多
本文采用铈掺杂的CuO-SiO_2复合氧化物作为催化剂,双氧水为氧化剂,以氧化脱除模拟油中苯并噻吩反应为探针,通过单因素实验考察氧化剂用量、溶剂用量、催化剂用量、氧化温度和氧化时间等因素对脱硫效果的影响。研究结果表明,铈掺杂的0.02...本文采用铈掺杂的CuO-SiO_2复合氧化物作为催化剂,双氧水为氧化剂,以氧化脱除模拟油中苯并噻吩反应为探针,通过单因素实验考察氧化剂用量、溶剂用量、催化剂用量、氧化温度和氧化时间等因素对脱硫效果的影响。研究结果表明,铈掺杂的0.02CeO_2-0.1CuO-SiO_2复合氧化物比表面积比未掺杂的比表面积略高,在模拟油用量10 m L、复合氧化物催化剂用量0.10 g、溶剂乙腈用量2.0 m L,氧化剂30%H_2O_20.2 m L、氧化反应温度65℃的条件下反应60 min,脱硫率为88.23%。展开更多
基金Projects supported by National Natural Science Foundation of China(20806035)Applied Basic Research Plans Program of Yunnan Province(2007E187M)+1 种基金Scientific Research Fund of Yunnan Provincial Education Department(08C0025)Analysis and Measurement Research Fund of Kunming University of Science and Technology(2008-003)
文摘XRD, Raman, TEM, and N2-adsorption were utilized to characterize CeO2/SiO2 prepared by coprecipi-tation and surfactant-assisted method. The results show that nanocrystalline CeO2 can be uniformly supported on the surface of SiO2 particles, when the molar ratio of Si4+/(Ce3++Si4+) is less than 35% in coprecipitation samples. At higher Si content, the surface of SiO2 can not be fully covered by CeO2. With surfactant (CTAB) added, the u-iformly supported structure can even exist when the molar ratio of Si4+/(Ce3++Si4+) is as high as 53%. It is because Ce and Si complexes can be well dispersed in precursor solution in present of CTAB. However, the uniformly supported structure can not be synthesised through surfactant-assisted approch for its hydrothermal threatment, which can easily lead to separate aggregation of nanocrystalline CeO2 and SiO2 particles.
文摘本文采用铈掺杂的CuO-SiO_2复合氧化物作为催化剂,双氧水为氧化剂,以氧化脱除模拟油中苯并噻吩反应为探针,通过单因素实验考察氧化剂用量、溶剂用量、催化剂用量、氧化温度和氧化时间等因素对脱硫效果的影响。研究结果表明,铈掺杂的0.02CeO_2-0.1CuO-SiO_2复合氧化物比表面积比未掺杂的比表面积略高,在模拟油用量10 m L、复合氧化物催化剂用量0.10 g、溶剂乙腈用量2.0 m L,氧化剂30%H_2O_20.2 m L、氧化反应温度65℃的条件下反应60 min,脱硫率为88.23%。
