A comparative study on the catalytic activity of Zn and Fe containing Al-MCM-41 molecular sieves on t-butylation of phenol

Autor:	Arumugam Pandurangan, R. Savidha, Muthiahpillai Palanichamy, Velayutham Murugesan
Rok vydání:	2004
Předmět:	Process Chemistry and Technology Inorganic chemistry Molecular sieve Catalysis chemistry.chemical_compound Adsorption MCM-41 chemistry Phenol Physical and Theoretical Chemistry Butyl acetate Mesoporous material Space velocity
Zdroj:	Journal of Molecular Catalysis A: Chemical. 211:165-177
ISSN:	1381-1169
Popis:	Mesoporous Al-MCM-41, Zn– and Fe–Al-MCM-41 molecular sieves with different metal contents were synthesised hydrothermally. The hexagonal structure of synthesised materials was confirmed by low angle XRD. The textural properties were measured by nitrogen adsorption studies. 27 Al MAS NMR was used to study the co-ordination environment of aluminium. Diffuse reflectance spectra (DRS) and electron paramagnetic resonance (EPR) studies also confirm the co-ordination environment of Fe in Fe–Al-MCM-41 framework. The acidity of the catalysts was measured by TPD of NH 3 and pyridine adsorbed FT-IR spectroscopy. t -Butylation of phenol with t -butyl acetate (TBA), a new alkylating agent was carried out in vapour phase over the mesoporous materials. For comparison purpose Zn and Fe ion exchanged Al-MCM-41 were also used. The effect of feed molar ratio, phenol space velocity and reaction temperature were studied and the results are discussed. Conditions were optimised to get better phenol conversion and 4- t -butyl phenol (4-TBP) selectivity.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a945229933704e3dfa14aded19516baf https://doi.org/10.1016/j.molcata.2003.10.022 Zobrazit plný text záznamu Full Text from ScienceDirect