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Methanol Decomposition On The β-ga_2o_3 (100) Surface: A Dft Approach

机译:β-ga_2o_3(100)表面上的甲醇分解:Dft方法

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Density functional theory (DFT) cluster model calculations on methanol reactions on the β-Ga_2O_3 (100) surface have been realized. β-Ga_2O_3 structure has tetrahedral and octahedral ions and the results of gallia-methanol interaction are different depending on the local surface chemical composition. The surface without oxygen vacancies is very reactive and produces the methanol molecule decomposition. The unsaturated surface oxygen atoms strongly oxidize the methanol molecule. CO_2 and H_2O molecules are produced when methanol reacts with a free oxygen vacancy surface on octahedral gallium sites. On the other hand, H_2CO is found after the reaction of this molecule with a free O vacancy surface on tetrahedral gallium sites. A weak interaction between the remaining CO_2 molecule and the oxide surface was found, being this molecule easy to desorb. Otherwise, H_2CO has a stronger surface bond and it could suffer a later oxidation.
机译:实现了β-Ga_2O_3(100)表面甲醇反应的密度泛函(DFT)聚类模型计算。 β-Ga_2O_3结构具有四面体和八面体离子,并且gall-甲醇相互作用的结果根据局部表面化学组成而不同。没有氧空位的表面具有很高的反应性,会导致甲醇分子分解。不饱和表面氧原子会强烈氧化甲醇分子。当甲醇与八面体镓位点上的自由氧空位表面反应时,会生成CO_2和H_2O分子。另一方面,在该分子与四面体镓位点上的自由O空位表面反应后,发现了H_2CO。发现剩余的CO_2分子与氧化物表面之间的相互作用较弱,因为该分子易于解吸。否则,H_2CO具有更强的表面键合力,并且可能随后发生氧化。

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