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Oxidative coupling of carboxylic acids or benzaldehydes with DMF using hydrotalicite-derived oxide catalysts
Applied Catalysis B: Environment and Energy ( IF 20.2 ) Pub Date : 2017-12-24 , DOI: 10.1016/j.apcatb.2017.12.058
Priya S. Samudrala , Akhil V. Nakhate , Shyam Sunder R. Gupta , Kalidas B. Rasal , Gunjan P. Deshmukh , Chandrakanth R. Gadipelly , Srinivas Theegala , Deepa K. Dumbre , Selvakannan Periasamy , V.R. Chary Komandur , Suresh K. Bhargava , Lakshmi Kantam Mannepalli

Hydrotalcite-derived (HT-derived) oxide catalysts were synthesised from hydrotalcite-like (HT-like) materials prepared by co-precipitation method (Cu-Al, Cu-Fe, Mg-Al, Mg-Fe, Ni-Fe and Ni-Al) followed by calcination and their catalytic activity was studied for oxidative amidation of carboxylic acids and substituted benzaldehydes with N,N-dimethylformamide (DMF). Catalyst screening was done using benzoic acid and DMF as a model reaction. Subsequently, we have optimised the reaction with different reaction parameters, catalyst loading, temperatures and oxidants. Cu-Fe HT-derived oxide catalyst showed excellent activity towards oxidative amidation using TBHP as an oxidant at 80 °C in 10 h. The fresh and spent catalysts were thoroughly characterised by different analytical techniques; XRD, SEM, HRTEM, TPD, N2 adsorption-desorption isotherm and XPS. Moreover, the catalyst was easily separated by simple filtration and reused up to four cycles without significant loss in catalytic activity.



中文翻译:

使用水滑石衍生的氧化物催化剂将羧酸或苯甲醛与DMF氧化偶联

由共沉淀法制备的类水滑石(HT类)材料合成了水滑石类(HT类)氧化物催化剂(Cu-Al,Cu-Fe,Mg-Al,Mg-Fe,Ni-Fe和Ni -Al),然后煅烧,并研究了它们的催化活性对羧酸和取代的苯甲醛与N,N-二甲基甲酰胺(DMF)的氧化酰胺化作用。使用苯甲酸和DMF作为模型反应进行催化剂筛选。随后,我们用不同的反应参数,催化剂负载量,温度和氧化剂优化了反应。Cu-Fe HT衍生的氧化物催化剂在TBHP作为氧化剂于80°C的条件下在10小时内表现出优异的氧化酰胺化活性。用不同的分析技术对新鲜的和用过的催化剂进行了彻底的表征。XRD,SEM,HRTEM,TPD,N2吸附-解吸等温线和XPS。而且,该催化剂易于通过简单的过滤进行分离,并且可以重复使用多达四个循环而不会显着降低催化活性。

更新日期:2017-12-24
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