丙烷及液体石蜡选择性氧化催化剂的筛选与制备
发布时间：2019-03-31 16:39
【摘要】：针对丙烷和液体石蜡选择性氧化制备脂肪酸的催化剂筛选与制备关键技术问题,本文以草酸铌、碲酸、钼酸铵、偏钒酸铵、硝酸镍和ZSM-5为原料制备了多金属氧化物基催化剂MoVTeNbO、Mo VTe Nb Ni O,V2O5/ZSM-5系列催化剂,分别用于催化丙烷氧化转化制取丙烯酸和催化液体石蜡氧化转化制取脂肪酸。用SEM、EDX、XRD、XPS、Raman、H2-TPR、NH3-TPD和FT-IR对催化剂进行了表征和功能特性研究,研究结果表明:(1)制备MoVTeNbO催化剂制备的最佳条件为:浆液法,元素比Mo:V:Nb:Te=1:0.3:0.12:0.23,焙烧温度600℃,惰性气氛下制取的催化剂具有高含量的活性相和最佳的丙烯酸产率。MoVTeNbO氧化转化丙烷的最佳条件:40目催化剂为0.4g,通入的混合反应气烷氧比为2:3,反应温度为400℃时丙烯酸产率最高,达到了16.1%,其中丙烷转化率为50.1%,丙烯酸选择性为33.2%。(2)对MoVTeNbO的改性研究发现Te元素在MoVTeNbO催化氧化丙烷过程中主要起丙烯酸的选择作用;Mo1V0.3Te0.23Nb0.12Ni0.008O对丙烷氧化转化丙烯酸的性能优于其它Ni含量掺杂的催化剂,丙烯酸产率为17.9%。其中丙烷转化率为51.9%,丙烯酸选择性为34.5%。(3)MoVNbO在液体石蜡的氧化转化过程中只起催化作用,V元素为MoVNbO的主要催化元素。ZMS-5为载体,采用共沉淀法制备V2O5/ZSM-5催化剂可用于液体石蜡催化氧化转化脂肪酸。当反应温度为150℃,反应时间为8 h,催化剂用量为0.1g时,在纯氧气氛下氧化产物酸值为17.33mg(KOH)/g、皂化值为33.52mg(KOH)/g。
[Abstract]:In this paper, niobium oxalate, tellurate, ammonium molybdate and metavanadate were selected as catalysts for selective oxidation of propane and liquid paraffin to prepare fatty acids. Polymetallic oxide-based catalysts MoVTeNbO,Mo VTeNb Ni-O and V _ 2O _ 5 / ZSM _ 5 series catalysts were prepared from nickel nitrate and ZSM-5. The catalysts were used for catalytic conversion of propane to acrylic acid and oxidation conversion of liquid paraffin to fatty acids, respectively. The catalysts were characterized and characterized by SEM,EDX,XRD,XPS,Raman,H2-TPR,NH3-TPD and FT-IR. The results showed that: (1) the optimum conditions for preparing MoVTeNbO catalysts were: slurry method; The calcination temperature of the element is 600 鈩，
本文编号：2451085
[Abstract]:In this paper, niobium oxalate, tellurate, ammonium molybdate and metavanadate were selected as catalysts for selective oxidation of propane and liquid paraffin to prepare fatty acids. Polymetallic oxide-based catalysts MoVTeNbO,Mo VTeNb Ni-O and V _ 2O _ 5 / ZSM _ 5 series catalysts were prepared from nickel nitrate and ZSM-5. The catalysts were used for catalytic conversion of propane to acrylic acid and oxidation conversion of liquid paraffin to fatty acids, respectively. The catalysts were characterized and characterized by SEM,EDX,XRD,XPS,Raman,H2-TPR,NH3-TPD and FT-IR. The results showed that: (1) the optimum conditions for preparing MoVTeNbO catalysts were: slurry method; The calcination temperature of the element is 600 鈩，
本文编号：2451085
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