{"id":{"repo_id":"cape-town","oai_identifier":"oai:open.uct.ac.za:11427/5423"},"canonical_url":"https://search.dev.ndltd.org/etd/cape-town/oai:open.uct.ac.za:11427/5423","repository":{"repo_id":"cape-town","name":"University of Cape Town","base_url":"https://open.uct.ac.za/oai/request"},"display":{"title":"Acid catalysed alkylation of diphenyl ether with methanol over shape-selective zeolites","abstract":"Selectivity in methylation of phenol over acidic catalysts depends primarily on temperature and the acidity of the catalyst. It is reported that direct methylation of phenol with methanol over weakly acidic catalysts yields predominantly o-cresol, whilst catalysts with medium acidity yield primarily o- and p-cresol, with significant anisole formation at lower temperatures (≈ 200°C). m-Cresol is, however, formed with significant selectivity over strongly acidic catalysts or at higher temperatures (typically 300°C and more). To date, only one industrial process is known which is selective to p-cresol but has the disadvantage of co-formaiton of inorganic salt, which is costly to dispose of.","abstract_html":"Selectivity in methylation of phenol over acidic catalysts depends primarily on temperature and the acidity of the catalyst. It is reported that direct methylation of phenol with methanol over weakly acidic catalysts yields predominantly o-cresol, whilst catalysts with medium acidity yield primarily o- and p-cresol, with significant anisole formation at lower temperatures (≈ 200°C). m-Cresol is, however, formed with significant selectivity over strongly acidic catalysts or at higher temperatures (typically 300°C and more). To date, only one industrial process is known which is selective to p-cresol but has the disadvantage of co-formaiton of inorganic salt, which is costly to dispose of.","abstract_has_math":false,"creators":["Ntshabele, John Phenyo Pheko"],"institution":"Department of Chemical Engineering","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":["Fletcher, Jack","Böhringer, Walter"],"committee_chairs":[],"committee_members":[],"year":2005,"date_issued":"2005","date_published":"2005","updated_at":"2026-07-22T22:23:44Z","subjects":[],"languages":["eng"],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/11427/5423","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Fletcher, Jack","Böhringer, Walter"]},{"key":"dc:creator","label":"Author","values":["Ntshabele, John Phenyo Pheko"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2014-07-31T11:14:43Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2014-07-31T11:14:43Z"]},{"key":"dc:date.issued","label":"Date","values":["2005"]},{"key":"dc:publisher.department","label":"Dc Publisher Department","values":["Department of Chemical Engineering"]},{"key":"dc:publisher.institution","label":"Dc Publisher Institution","values":["University of Cape Town"]},{"key":"dc:type","label":"Dc Type","values":["Master Thesis"]},{"key":"dc:type.qualificationlevel","label":"Dc Type Qualificationlevel","values":["Masters"]},{"key":"dc:type.qualificationname","label":"Dc Type Qualificationname","values":["MSc"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["eng"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/11427/5423"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Includes bibliographical references (p. 177-185)."]},{"key":"dc:description.abstract","label":"Abstract","values":["Selectivity in methylation of phenol over acidic catalysts depends primarily on temperature and the acidity of the catalyst. It is reported that direct methylation of phenol with methanol over weakly acidic catalysts yields predominantly o-cresol, whilst catalysts with medium acidity yield primarily o- and p-cresol, with significant anisole formation at lower temperatures (≈ 200°C). m-Cresol is, however, formed with significant selectivity over strongly acidic catalysts or at higher temperatures (typically 300°C and more). To date, only one industrial process is known which is selective to p-cresol but has the disadvantage of co-formaiton of inorganic salt, which is costly to dispose of."]},{"key":"dc:title","label":"Title","values":["Acid catalysed alkylation of diphenyl ether with methanol over shape-selective zeolites"]}]}],"canonical_facts":{"dc:contributor.advisor":["Fletcher, Jack","Böhringer, Walter"],"dc:creator":["Ntshabele, John Phenyo Pheko"],"dc:date.accessioned":["2014-07-31T11:14:43Z"],"dc:date.available":["2014-07-31T11:14:43Z"],"dc:date.issued":["2005"],"dc:description":["Includes bibliographical references (p. 177-185)."],"dc:description.abstract":["Selectivity in methylation of phenol over acidic catalysts depends primarily on temperature and the acidity of the catalyst. It is reported that direct methylation of phenol with methanol over weakly acidic catalysts yields predominantly o-cresol, whilst catalysts with medium acidity yield primarily o- and p-cresol, with significant anisole formation at lower temperatures (≈ 200°C). m-Cresol is, however, formed with significant selectivity over strongly acidic catalysts or at higher temperatures (typically 300°C and more). To date, only one industrial process is known which is selective to p-cresol but has the disadvantage of co-formaiton of inorganic salt, which is costly to dispose of."],"dc:identifier.uri":["http://hdl.handle.net/11427/5423"],"dc:language.iso":["eng"],"dc:publisher.department":["Department of Chemical Engineering"],"dc:publisher.institution":["University of Cape Town"],"dc:title":["Acid catalysed alkylation of diphenyl ether with methanol over shape-selective zeolites"],"dc:type":["Master Thesis"],"dc:type.qualificationlevel":["Masters"],"dc:type.qualificationname":["MSc"]},"updated_at":"2026-07-22T22:23:44Z"}