The Effect of Molar Ratio and Precipitation Time of Mg/Al Hydrotalcite Synthesis on the Isomerization of Glucose into Fructose

A. R. Permanasari, F. Yulistiani, Rony Pasonang Sihombing, Ahmad Fauzan, Keryanti Keryanti, Wahyu Wibisono
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Abstract

The substitution of Mg/Al hydrotalcite catalyst over the glucose-isomerase is expected to decrease the space-time and reduce the energy consumption of glucose isomerization into fructose. The quality of the Mg/Al hydrotalcite catalyst is determined during the synthesis process. The synthesis has been carried out in the various Mg/Al molar ratio and precipitation times and observed the catalytic activity in the isomerization. Response Surface Methodology (RSM) is used to analyze statistically the optimum condition of the synthesis process. The Mg/Al molar ratio was 1:1 to 4:1 with a precipitation time of 720-1080 min. The characterization of the Mg/Al hydrotalcite catalyst includes the functional groups of the constituent compounds by FTIR, the crystallinity and particle size by (XRD), and the surface area of the catalyst by BET. The RSM results show the optimum condition of the Mg/Al molar ratio and precipitation time to produce the highest mass catalyst product of Mg/Al hydrotalcite catalyst (3,38 g) is 3.34:1 and 984.85 min. The highest degree of crystallinity obtained is 28.70% with the particle size is 10.19 Å. The highest yield and selectivity of the isomerization process are 56.95% and 91.89%, respectively. By the RSM analytical method, the Mg/Al molar ratio and the precipitation time used in this catalyst synthesis do not give a significant effect on the catalytic activity of the isomerization.
镁/铝水滑石合成的摩尔比和沉淀时间对葡萄糖异构化成果糖的影响
用镁/铝氢氧化铝催化剂取代葡萄糖异构酶,可望缩短葡萄糖异构化为果糖的时 间,降低能耗。镁/铝氢氧化铝催化剂的质量是在合成过程中确定的。在不同的镁/铝摩尔比和沉淀时间下进行了合成,并观察了异构化过程中的催化活性。采用响应面方法(RSM)对合成过程的最佳条件进行统计分析。镁/铝摩尔比为 1:1 至 4:1,沉淀时间为 720-1080 分钟。对 Mg/Al 水滑石催化剂的表征包括用傅立叶变换红外光谱分析组成化合物的官能团,用 XRD 分析结晶度和粒度,用 BET 分析催化剂的表面积。RSM 结果表明,镁/铝摩尔比和沉淀时间的最佳条件分别为 3.34:1 和 984.85 分钟,可生成质量最大的镁/铝氢氧化铝催化剂产物(3.38 克)。异构化过程的最高产率和选择性分别为 56.95% 和 91.89%。根据 RSM 分析方法,该催化剂合成过程中使用的镁/铝摩尔比和沉淀时间对异构化催化活性没有显著影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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