Microstructure control of magnesium dichloride crystallites by electron donors: The effect of methanol

Autor:	Peter Denifl, Timo Leinonen, Mikko Linnolahti, Tapani A. Pakkanen, Virve A. Karttunen, Anniina Turunen
Rok vydání:	2011
Předmět:	Magnesium Process Chemistry and Technology Catalyst support Inorganic chemistry chemistry.chemical_element Electron donor Microstructure Catalysis Crystallography chemistry.chemical_compound Adsorption chemistry Crystallite Physical and Theoretical Chemistry Ziegler–Natta catalyst
Zdroj:	Journal of Molecular Catalysis A: Chemical. 334:103-107
ISSN:	1381-1169
DOI:	10.1016/j.molcata.2010.11.003
Popis:	The ability to control the microstructure of magnesium dichloride (MgCl 2 ) crystallites by electron donors was demonstrated by quantum chemical calculations, using methanol as a model donor. Investigation of sets of differently shaped MgCl 2 crystallites showed the dominance of the five-fold coordinated (1 0 0) crystal surface over the four-fold coordinated (1 1 0) surface to emerge as a factor increasing crystallite stability. To study the role of electron donors in controlling MgCl 2 crystallite shape, crystallites were saturated with methanol. The stability order of the crystallites was significantly affected by donor adsorption. Reverse to the case of pure MgCl 2 , crystallites with the highest (1 1 0) to (1 0 0) surface site ratio became the most stable after donor adsorption. This indicates control of the shape of MgCl 2 crystallites to be attainable by appropriate choice of electron donor, a result utilizable in heterogeneous Ziegler–Natta olefin polymerization catalysis.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::4550a3ca8ae7fbe98851f6fad16c8e1c https://doi.org/10.1016/j.molcata.2010.11.003 Zobrazit plný text záznamu Full Text from ScienceDirect