高活性镁铝复合氧化物的制备
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摘要
脂肪酸甲酯乙氧基化物(MEE)是性能优良的酯-醚型非离子表面活性剂,其合成关键是乙氧基化催化剂。本文用共沉淀法合成镁铝复合氧化物催化剂,系统考察了催化剂制备的各种影响因素,且通过BET、XRD、DSC、红外光谱等表征表明当Al/Mg比0.4∶1、老化时间16 h、反应时间50 min、Na/(Al+Mg)比2.6、焙烧温度400℃时,镁铝复合氧化物催化剂的比表面积可达212.72 m~2/g,为MEE的催化反应奠定基础。
Methyl Ester Ethoxylates(MEE) is a kind of good performance of ester-ether type nonionic surfactant, and the catalyst is the key. In this paper, a series of Mg-Al complex oxide catalyst were synthesized by coprecipitation method, and some influencing factors were investigated. In addition, BET, XRD, DSC and FT-IR were used to analyze the catalyst. The results show that catalyst is well enough because its specific surface area reached 212 m~2/g, under the reaction time of 50 min, aging time of 16 h, the activation temperature of 400 ℃, with molar ratio of Al/Mg of 0.4:1 and molar ratio of Na/(Al+Mg) of 2.6. The catalyst with complete crystal forms and good thermal stability pave the way for catalytic reaction of MEE.
Methyl Ester Ethoxylates(MEE) is a kind of good performance of ester-ether type nonionic surfactant, and the catalyst is the key. In this paper, a series of Mg-Al complex oxide catalyst were synthesized by coprecipitation method, and some influencing factors were investigated. In addition, BET, XRD, DSC and FT-IR were used to analyze the catalyst. The results show that catalyst is well enough because its specific surface area reached 212 m~2/g, under the reaction time of 50 min, aging time of 16 h, the activation temperature of 400 ℃, with molar ratio of Al/Mg of 0.4:1 and molar ratio of Na/(Al+Mg) of 2.6. The catalyst with complete crystal forms and good thermal stability pave the way for catalytic reaction of MEE.
引文
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[4]袁素珺,张青红,李耀刚,等.高比表面积的镁铝复合氧化物纳米薄片的制备及其吸附性能[J].硅酸盐通报,2009,28(4):636-640.
[5]孙璠,李泽龙,刘蒲,等.镁铝复合金属氧化物负载纳米Pd催化剂的制备及其在醇胺一步合成亚胺反应中的应用[J].分子催化,2014,28(05):410-417.
[6]许凯,史翊翔,湛志钢,徐等.钾修饰镁铝复合金属氧化物脱除二氧化碳实验研究[J].中国电机工程学报,2016,36(23):6454-6459+6611.
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[11]KUSTROWSKI P,RAFALSKA-LASOCHA A,MAJDA D,et al.Preparation and characterization of new Mg-Al-Fe oxide catalyst precursors for dehydrogenation of ethylbenzene in the presence of carbon dioxide[J].Solid State Ionics,2001,141-142:237-242.
[12]Leon M,DIAZ E,BENNICI S,et al.Adsorption of CO2 on hydrotalcite-derived mixed oxides:Sorption mecha-nisms and consequences for adsorption irreversibility[J].Ind Eng Chem Res,2010,49:3663-3671.
[1]石振民,李军正.脂肪酸甲酯乙氧基化物(MEE)的现状与发展趋势[C].中国日用化学工业研讨会,2007.
[2]刘贺.浅谈非离子表面活性剂的特点与应用[J].皮革与化工,2012(03):20-26.
[3]朱春华,张纪梅.Mg/Al复合氧化物的合成及其催化窄分布聚醚合成研究[J].天津工业大学学报,2005,24(1):20-24.
[4]袁素珺,张青红,李耀刚,等.高比表面积的镁铝复合氧化物纳米薄片的制备及其吸附性能[J].硅酸盐通报,2009,28(4):636-640.
[5]孙璠,李泽龙,刘蒲,等.镁铝复合金属氧化物负载纳米Pd催化剂的制备及其在醇胺一步合成亚胺反应中的应用[J].分子催化,2014,28(05):410-417.
[6]许凯,史翊翔,湛志钢,徐等.钾修饰镁铝复合金属氧化物脱除二氧化碳实验研究[J].中国电机工程学报,2016,36(23):6454-6459+6611.
[7]连奕新,王会芳,张元华,等.焙烧温度对镁铝复合氧化物载体性能的影响[J].石油化工,2009,38(6):622-628.
[8]KL0PR0GGEl JT,RAY L.Fourier transform infrared and Raman spectroscopic study of the local structure of Mg-,Ni-,and CoHydrotalcites[J].Journal of Solid State Chemistry,1999,146:506-515.
[9]VELU S,SABDE D.P,NEEPA S,et al.New hydrotalcite-like anionic clays containing Zr4-in the layers:synthesis and physicochemical properties[J].Chem Mater,1998,10:3451-3458.