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摘要: 研究了载体对负载型NiSn催化剂丙烷脱氢性能的影响,主要对比考察了以SiO2、MgO、Al2O3、MgAl2O4为载体的NiSn催化剂的丙烷脱氢性能。采用X射线衍射技术(XRD)、氮气吸附-脱附技术、氨气程序升温脱附技术(NH3-TPD)以及氢气程序升温还原技术(H2-TPR)对催化剂样品进行表征。结果表明,SiO2因具有较大的比表面积、大孔径、酸性较弱等特点,以其为载体制备所得催化剂中Ni2.67Sn2组分含量高,催化剂性能较高。Abstract: In this paper, we studied the effects of supports, such as SiO2, MgO, Al2O3 and MgAl2O4, on the performance of supported NiSn catalyst for propane dehydrogenation. NH3 temperature-programmed desorption, H2 temperature-programmed reduction were applied for the characterization of the catalysts. The results show that SiO2 with large specific surface area and large pore size can achieve good contact between catalyst and reactants, leading to a high content of Ni2.67Sn2 alloy and a reduced diffusion resistance, In addition, their weak acid improve dehydrogenation activity and propene selectivity.
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Key words:
- propane dehydrogenation /
- NiSn-based catalysts /
- support
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表 1 不同载体NiSn催化剂的结构性质
Table 1 Textural properties of NiSn catalysts with different supports
Sample ABET/(m2·g-1) vpore/(mL·g-1) dpore/nm dc/nm 5NiSn/SiO2 253 0.98 11.4 48.8 5NiSn/Al2O3 138 0.21 3.6 46.2 5NiSn/MgAl2O4 91 0.21 6.2 38.0 5NiSn/MgO 25 0.19 25.2 44.4 ABET: BET specific area; vpore: pore volume; dpore: average pore diameter; dc: crystallite size determined by scherrer’s equation 表 2 不同载体NiSn催化剂的酸量分布
Table 2 The amount of acid on NiSn catalysts with different supports
Catalyst tM/℃ Total acid content/(mmol·g-1 cat)* Peak fraction/% Ⅰ Ⅱ Ⅲ Ⅰ Ⅱ Ⅲ 5NiSn/SiO2 187 245 358 0.30 34.1 52.7 13.2 5NiSn/Al2O3 175 231 328 0.50 21.7 31.8 46.5 5NiSn/MgAl2O4 184 243 334 0.31 22.8 50.9 26.3 5NiSn/MgO 176 262 365 0.08 45.2 32.8 22.0 *: the amount of acid is calculated as the amount of ammonia adsorbed per gram of catalyst
tM: the temperature of the highest desorption peak -
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