Diffusion-controlled synthesis of Cu-based for the Rochow reaction

TY - JOUR

T1 - Diffusion-controlled synthesis of Cu-based for the Rochow reaction

AU - Liu, Hezhi

AU - Li, Jing

AU - Ji, Yongjun

AU - Zhang, Zailei

AU - Wang, Xueguang

AU - Zhong, Ziyi

AU - Su, Fabing

N1 - Publisher Copyright: © 2017, Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature.

PY - 2017/12/1

Y1 - 2017/12/1

N2 - The properties of materials are strongly dependent on their structures. The diffusion effect is a main kinetic factor that can be used to regulate the growth and structure of materials. In this work, we developed a systematic and feasible strategy to synthesize Cu2O solid spheres and hexahedrons by controlling the diffusion coefficients. These Cu2O products can be successively transformed into corresponding Cu hollow spheres and hexahedrons as well as CuO porous spheres and hexahedrons by controlling hydrogen diffusion in hydrazine hydrate solution and controlling oxygen diffusion in air, respectively. The formation of these transformations was also discussed in detail. Tested for Rochow reaction, the as-prepared Cu2O solid and CuO porous spheres exhibit higher dimethyldichlorosilane selectivity and Si conversion than Cu hollow spheres, which is attributed to the active sites for CH3Cl adsorption formed in CuxSi phase after the removal of oxygen atoms in Cu2O and CuO in the formation of dimethylchlorosilane. The present work not only develops a feasible method for preparing well shape-defined Cu2O solid spheres and hexahedrons but also clarifies the respective roles of Cu, Cu2O and CuO in dimethyldichlorosilane synthesis via Rochow reaction.

AB - The properties of materials are strongly dependent on their structures. The diffusion effect is a main kinetic factor that can be used to regulate the growth and structure of materials. In this work, we developed a systematic and feasible strategy to synthesize Cu2O solid spheres and hexahedrons by controlling the diffusion coefficients. These Cu2O products can be successively transformed into corresponding Cu hollow spheres and hexahedrons as well as CuO porous spheres and hexahedrons by controlling hydrogen diffusion in hydrazine hydrate solution and controlling oxygen diffusion in air, respectively. The formation of these transformations was also discussed in detail. Tested for Rochow reaction, the as-prepared Cu2O solid and CuO porous spheres exhibit higher dimethyldichlorosilane selectivity and Si conversion than Cu hollow spheres, which is attributed to the active sites for CH3Cl adsorption formed in CuxSi phase after the removal of oxygen atoms in Cu2O and CuO in the formation of dimethylchlorosilane. The present work not only develops a feasible method for preparing well shape-defined Cu2O solid spheres and hexahedrons but also clarifies the respective roles of Cu, Cu2O and CuO in dimethyldichlorosilane synthesis via Rochow reaction.

KW - Rochow reaction

KW - cuprous oxide

KW - hollow spheres

KW - porous spheres

KW - surface oxygen vacancies

UR - http://www.scopus.com/inward/record.url?scp=85039055380&partnerID=8YFLogxK

U2 - 10.1007/s40843-017-9128-4

DO - 10.1007/s40843-017-9128-4

M3 - 文章

AN - SCOPUS:85039055380

SN - 2095-8226

VL - 60

SP - 1215

EP - 1226

JO - Science China Materials

JF - Science China Materials

IS - 12

ER -