An alumina-supported homonuclear macrocyclic zirconium complex for reformation of n-hexane

• Published in: Journal of Molecular Catalysis. A, Chemical Vol. 216; no. 1; pp. 157 - 163
• Main Authors: Kishore, M.Jhansi L., Mishra, G.S., Kumar, Anil
• Format: Book Review Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01-07-2004; Elsevier
• Subjects: Catalysis; Catalysts: preparations and properties; Chemistry; Exact sciences and technology; General and physical chemistry; Heterogeneous catalysis; Homonuclear macrocyclic complex; n-Hexane; Reformation; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Heterogeneous catalysis; n-Hexane; Homonuclear macrocyclic complex; Reformation; Hydrocarbon; Organic ligand; Reforming; Transition metal Complexes; Review; Zirconium complex; Supported catalyst; Macrocycle; Alkane; Reaction mechanism; Hexane; Alumina
• ISSN: 1381-1169; 1873-314X
• DOI: 10.1016/j.molcata.2004.02.012

A heterogenous formation catalyst supporting a homonuclear macrocyclic zirconium complex has been developed which reforms n-hexane at low temperature and pressure forming isomerized products
The homonuclear macrocyclic complex involving zirconium on both sites is prepared starting from 2,6-diformyl-4-methyl-phenol and 1,2-phenylenediamine, and is chemically bound to carbamate-modified alumina. The UV-Vis spectrum shows the presence of the metal on the catalyst surface. The TGA of the catalyst suggests that the catalyst is stable up to 250
°C. Reformation of
n-hexane has been carried out in its presence under nitrogen atmosphere at considerably low temperature and pressure (423
K, 27
atm). We obtained a high conversion of 72% and the GC-MS of the product showed the forming of 2-methylpentane (2MP), 3-methylpentane (3MP), methylcyclopentane (MCP) and cyclohexane (CH). Experimental results reveal that there are no dehydrogenation (forming alkenes), dehydrocyclization (forming benzene or toluene), and cracking (forming C
1–C
5 compounds) reactions and a mechanism forming the products has been suggested.