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Theoretical Study on the Role of Surface Basicity and Lewis Acidity on theEtherification of Glycerol over Alkaline Earth Metal Oxides

机译:表面碱度和路易斯酸度对甘油在碱土金属氧化物上醚化作用的理论研究

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摘要

Alkaline earth metal oxides(MO) are catalytically active in theetherification of glycerol. DensityFunctional Theory (DFT) calculationshave been used to examine the reactiv-ity of glycerol with MO surfaces withM =Mg, Ca, Sr or Ba. More specifical-ly, the optimum glycerol adsorptionmode and the strength of glycerol in-teraction with regular MO (001) sur-faces and a stepped CaO surface havebeen investigated and involves the in-teraction with acid—base surface sites.The basicity of lattice oxygen atoms iscorrelated with the adsorption energy:BaO (-3.02 eV) > SrO (-2.85 eV) >CaO (-2.05 eV) > MgO (-1.35 eV).The interactions have an exothermiccharacter, that is, the more basic the al-kaline earth metal oxide, the more exo- thermic is the adsorption process andthe higher the dissociation extent.Thus, the dissociation of glycerol in-creases in the order: MgO (not dissoci-ated) < Ca() (partially dissociated
机译:碱土金属氧化物(MO)在甘油的醚化中具有催化活性。已经使用密度泛函理论(DFT)计算来检查具有M = Mg,Ca,Sr或Ba的MO表面的甘油的反应性。更具体地说,已经研究了最佳的甘油吸附模式和甘油与规则的MO(001)表面和阶梯状CaO表面相互作用的强度,并涉及与酸碱表面部位的相互作用。晶格的碱性氧原子与吸附能相关:BaO(-3.02 eV)> SrO(-2.85 eV)> CaO(-2.05 eV)> MgO(-1.35 eV)相互作用具有放热特征,即铝的碱性越强-碱土金属氧化物,吸附过程越放热,解离程度越高。因此,甘油的解离顺序依次为:MgO(未解离)

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