In this article, Ni/CNTs(carbon nano-tubes) catalyst′s effect for methanol vapor-phase carbonylation under atmospheric pressure were studied. The relations between the catalyst activity and drying condition, the temp...In this article, Ni/CNTs(carbon nano-tubes) catalyst′s effect for methanol vapor-phase carbonylation under atmospheric pressure were studied. The relations between the catalyst activity and drying condition, the temperature of thermal treatment(with N2) and reduction(with H2) were investigated. The catalyst showed high activity when catalyst were dried step by step. The optimal temperature for thermal treatment with N2 and reduction with H2 were 300 ℃ and 700 ℃respectively.展开更多
As the simplest hydrogen-bonded alcohol,liquid methanol has attracted intensive experimental and theoretical interest.However,theoretical investigations on this system have primarily relied on empirical intermolecular...As the simplest hydrogen-bonded alcohol,liquid methanol has attracted intensive experimental and theoretical interest.However,theoretical investigations on this system have primarily relied on empirical intermolecular force fields or ab initio molecular dynamics with semilocal density functionals.Inspired by recent studies on bulk water using increasingly accurate machine learning force fields,we report a new machine learning force field for liquid methanol with a hybrid functional revPBE0 plus dispersion correction.Molecular dynamics simulations on this machine learning force field are orders of magnitude faster than ab initio molecular dynamics simulations,yielding the radial distribution functions,selfdiffusion coefficients,and hydrogen bond network properties with very small statistical errors.The resulting structural and dynamical properties are compared well with the experimental data,demonstrating the superior accuracy of this machine learning force field.This work represents a successful step toward a first-principles description of this benchmark system and showcases the general applicability of the machine learning force field in studying liquid systems.展开更多
文摘In this article, Ni/CNTs(carbon nano-tubes) catalyst′s effect for methanol vapor-phase carbonylation under atmospheric pressure were studied. The relations between the catalyst activity and drying condition, the temperature of thermal treatment(with N2) and reduction(with H2) were investigated. The catalyst showed high activity when catalyst were dried step by step. The optimal temperature for thermal treatment with N2 and reduction with H2 were 300 ℃ and 700 ℃respectively.
基金supported by the CAS Project for Young Scientists in Basic Research(YSBR-005)the National Natural Science Foundation of China(22325304,22221003 and 22033007)We acknowledge the Supercomputing Center of USTC,Hefei Advanced Computing Center,Beijing PARATERA Tech Co.,Ltd.,for providing high-performance computing services。
文摘As the simplest hydrogen-bonded alcohol,liquid methanol has attracted intensive experimental and theoretical interest.However,theoretical investigations on this system have primarily relied on empirical intermolecular force fields or ab initio molecular dynamics with semilocal density functionals.Inspired by recent studies on bulk water using increasingly accurate machine learning force fields,we report a new machine learning force field for liquid methanol with a hybrid functional revPBE0 plus dispersion correction.Molecular dynamics simulations on this machine learning force field are orders of magnitude faster than ab initio molecular dynamics simulations,yielding the radial distribution functions,selfdiffusion coefficients,and hydrogen bond network properties with very small statistical errors.The resulting structural and dynamical properties are compared well with the experimental data,demonstrating the superior accuracy of this machine learning force field.This work represents a successful step toward a first-principles description of this benchmark system and showcases the general applicability of the machine learning force field in studying liquid systems.
