Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.635762
Title: Synthesis and analysis of nitro compounds under zeolite catalysts
Author: Almeer, S.
Awarding Body: University of Wales Swansea
Current Institution: Swansea University
Date of Award: 2000
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Abstract:
The purpose of this study was to develop a new and clean method for aromatic nitration using heterogeneous inorganic solid catalysts. The thesis consists four chapters. Chapter 1 presents an introduction for the types of heterogeneous catalyst with some details for the most important catalyst. An eletrophilic aromatic substitution is presented in Chapter 2. Some of the latest reports are shown in this chapter as examples for aromatic nitration using different type of nitrating reagents. Chapter 3 shows the nitration of halogenobenzenes using dinitrogen tetroxide, zeolite Hβ, oxygen in solvent system. Zeolite Hβ (Si/Al = 12.5) and Y (Si/Al = 30) were found to be the most efficient catalysts for the para-selectivity nitration of halogenobenzenes when dinitrogen tetroxide was used as nitrating reagent over zeolite Hβ in 1,2-dichloroethane. This system represents a low energy (0oC), and potentially a clean synthesis of halonitrobenzenes using an easily recycled solvent and catalyst system. Chapter 4 shows the nitration of aromatic compounds using dinitrogen tetroxide, zeolite Hβ, and air in non-solvent system. This system has more advantages than the first system. Zeolite Hβ (Si/Al = 12.5) was found to be the most efficient catalyst for the para-selectivity nitration for haolgenobenzene and benzene when dinitrogen tetroxide was used as nitrating reagent over zeolite Hβ under 200 psi air pressure at room temperature.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.635762  DOI: Not available
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