原位共沉淀法制备NiMg(Al)O/γ-Al2O3催化剂及其酯交换性能

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。

In situ co-precipitation of NiMg(Al)O on γ-Al2O3 and its catalytic performance in the transesterification

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.