In situ co-precipitation of NiMg(Al)O on γ-Al2O3 and its catalytic performance in the transesterification
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摘要: 以γ-Al2O3为载体通过原位共沉淀法制备NiMgAl-LDHs/γ-Al2O3,经焙烧后得到NiMg(Al)O/γ-Al2O3催化剂,通过TG-DTG、XRD、SEM、BET、FT-IR、CO2-TPD等手段对催化剂进行了表征,并对其在酯交换制备生物柴油反应中的催化性能进行了研究。结果表明,NiMgAl-LDHs和NiMg(Al)O成功在γ-Al2O3内孔表面生长,并有良好的结合度。催化剂对酯交换具有很高的催化活性;在醇油物质的量比为12:1的条件下反应3 h,生物柴油产率为95%,重复使用七次后,生物柴油产率仍然在82%以上。Abstract: NiMgAl-LDHs/γ-Al2O3 was first synthesized by in-situ co-precipitation method with γ-Al2O3 as support, which was further transformed to the NiMg(Al)O/γ-Al2O3 catalyst through calcination. The NiMg(Al)O/γ-Al2O3 catalyst was characterized by TG-DTG, XRD, SEM, N2 physisorption, FT-IR and CO2-TPD and its performance in the transesterification was investigated, for the production of biodiesel with microalgae oil and methanol as raw materials. The results show that NiMgAl-LDHs and NiMg(Al)O are successfully developed on the surface and pores of γ-Al2O3 with high binding strength. The NiMg(Al)O/γ-Al2O3 catalyst exhibits high activity in transesterification; with a methanol/oil molar ratio of 12:1, the yield of biodiesel oil reaches 95% after reaction for 3 h. Moreover, the yield of biodiesel is still above 82% after using seven times.
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Key words:
- biodiesel /
- γ-Al2O3 /
- transesterification /
- hydrotalcite
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表 1 不同催化剂的结构参数
Table 1 Texture properties of different catalysts
Catalyst BET surface
area A/
(m2·g-1)Total pore
volume v/
(cm3·g-1)Pore size
d/nmγ-Al2O3 140.18 0.66 19.72 NiMg(Al)O 132.51 0.41 8.46 NiMg(Al)O/γ-Al2O3 156.90 0.43 9.04 -
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