Synthesis of γ‐Valerolactone from Levulinic Acid and Formic Acid over Mg‐Al Hydrotalcite Like Compound,ChemistrySelect

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Synthesis of γ‐Valerolactone from Levulinic Acid and Formic Acid over Mg‐Al Hydrotalcite Like Compound
ChemistrySelect ( IF 1.9 ) Pub Date : 2018-06-13 , DOI: 10.1002/slct.201800536
SK. Hussain ₁ , Vijay Kumar Velisoju ₁ , N. Pethan Rajan ₁ , Balla Putra Kumar ₁ , Komandur V. R. Chary ₁

Affiliation

Catalytic transformation of levulinic acid (LA) with in situ hydrogen transfer from formic acid (FA) into γ‐valerolactone (GVL) was investigated over calcined Mg‐Al hydrotalcite catalysts under atmospheric N₂ pressure. Several catalysts containing different Mg/Al mole ratio in between 1:4 to 7:1 were synthesized by co‐precipitation method. The catalytic performances of calcined Mg/Al hydrotalcite during LA hydrogenation were found to be much higher than pure magnesia (MgO) and physical mixture samples of MgO‐Al₂O₃. Pure MgO exhibited higher activity in the initial hours but a gradual deactivation was noticed during the course of reaction time. Under the optimised reaction conditions, the calcined Mg/Al hydrotalcite catalyst with Mg/Al ratio of 3:1 exhibited superior performance with high GVL selectivity of 98% and total conversion of LA till 10 h of reaction time. The synthesised catalysts were characterized by various spectroscopic and adsorption techniques. The catalytic activity results during hydrogenation are well supported by means of the findings of characterization of the catalysts.

中文翻译：

镁铝水滑石类化合物由戊酸和甲酸合成γ-戊内酯

与来自甲酸（FA）原位氢转移到γ乙酰丙酸（LA）的催化转化-戊内酯（GVL）的混合物在大气氮研究过煅烧的Mg-Al水滑石的催化剂₂的压力。通过共沉淀法合成了几种Mg / Al摩尔比在1：4至7：1之间的催化剂。发现煅烧的Mg / Al水滑石在LA加氢过程中的催化性能远高于纯镁（MgO）和MgO-Al ₂ O _3的物理混合物样品。纯MgO在最初的几个小时内表现出较高的活性，但在反应过程中却逐渐失活。在优化的反应条件下，Mg / Al比为3：1的Mg / Al水滑石煅烧催化剂表现出优异的性能，GVL选择性高达98％，LA的总转化率达到反应时间10小时。合成的催化剂通过各种光谱学和吸附技术进行了表征。借助于表征催化剂的发现，可以很好地支持氢化过程中的催化活性结果。

更新日期：2018-06-13

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