基于天然二氧化硅的磁性纳米颗粒作为甲酯形成酸催化剂

Falah Azizah Elmaria, S. N. A. Jenie
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引用次数: 2

摘要

天然二氧化硅在催化剂等各个领域具有优势,因为它易于获得并应用于化学反应过程中。天然硅基磁酸催化剂MSNP/SO42-的合成目的是在油酸与甲醇反应生成甲酯的过程中获得大收率。用蒸馏水洗涤从地热废渣中提取的天然二氧化硅,然后在pH为4-6的条件下采用溶胶凝胶法获得二氧化硅纳米颗粒。通过添加FeCl3来获得磁性能,通过改变十六烷基三甲基溴化铵(CTAB)来获得最佳介孔尺寸。Brunauer emmet teller (BET)实验结果表明,当二氧化硅与CTAB的摩尔浓度比为1:2时,其比表面积为520.94 m2/g。采用程序升温解吸氨法(TPD-NH3)和振动样品磁强计(VSM)对催化剂的酸性和磁性进行了表征,得到催化剂的总酸度为0.2488 mmol/g和0.2488 mmol/g。分别为软磁型。改性为MSNP/SO42-的硫酸盐的BET比表面积减少了114.44 m2/g。采用MSNP/SO42-作为催化剂生成甲酯,气相色谱-质谱(GC- MS)结果表明,MSNP/SO42-的产率为85.41%。
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Magnetic Nanoparticles based on Natural Silica as a Methyl Ester Forming Acid Catalyst
Natural silica has advantages in various fields such as catalysts, because it is easily obtained and applied in the chemical reaction process. The synthesis of natural silica-based magnetic acid catalyst, MSNP/SO42- aims to obtain a large yield from the reaction process between oleic acid and methanol to form methyl ester. Natural silica obtained from geothermal waste was washed with distilled water, then sol gel method was applied at  pH of 4-6 to obtain SiO2 nanoparticles. FeCl3 was added to achieve the magnetic properties, and the cetyl trimethyl ammonium bromide  (CTAB) is varied in order to attain optimal mesoporous size. Brunauer emmet teller (BET) results showed optimum results from 1: 2 molarity ratio between silica and CTAB with a surface area of 520.94 m2/g. The acidic properties were obtained by immersion using H2SO4 0.5 M. The catalyst were tested for the acidic and magnetic properties  using temperature programmed desorption ammonia (TPD-NH3) and vibrating sample magnetometer (VSM) characterization resulting intotal acidity of 0.2488 mmol/g and. softmagnetic type, respectively. The BET surface area  of the sulfate modified into MSNP/SO42-, was decreased by 114.44 m2/g. Application of MSNP/SO42- as a catalyst for forming methyl esters obtained a percentage of 85.41% yield based on the gas chromatography mass spectrometry (GC- MS) results.
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