{"id":{"repo_id":"njit","oai_identifier":"oai:digitalcommons.njit.edu:theses-1026"},"canonical_url":"https://search.dev.ndltd.org/etd/njit/oai:digitalcommons.njit.edu:theses-1026","repository":{"repo_id":"njit","name":"NJIT","base_url":"https://digitalcommons.njit.edu/do/oai/"},"display":{"title":"Investigation of NH3 and no adsorption over Cu/SAPO-34 and Cu/AlOo3 catalysts for NH3–SCR system","abstract":"In this study, Copper supported on SAPO-34 molecular sieves or alumina is prepared via an incipient wetness impregnation method for ammonia selective catalytic reduction (NH_3-SCR). These NH_3-SCR catalysts are characterized by pulse chemisorption, temperature-programmed reduction (TPR), and temperature-programmed desorption (TPD) with three different conditions (NH_3, NO, combined NH_3-NO) to evaluate the adsorption of ammonia and nitric oxide. Cu/SAPO-34 catalyst has shown higher ammonia adsorption capacity compared to Cu/Al_2O_3 catalyst. The Cu/SAPO-34 adsorption is enhanced due to the strong acidity and high surface area of SAPO-34 molecular sieves. NO adsorption peaks over both catalysts are small (for NO-TPD) and these peaks become broader when a combined NH_3-NO is introduced to the system. However, Cu/SAPO-34 & Cu/Al_2O_3 surface area and acidity are decreased dramatically comparing to SAPO-34 and Al_2O_3 supports. These observations are verified by TPR and CO chemisorption. The formation of bulk copper aluminate over (Cu/Al_2O_3) surface and CuO over (Cu/SAPO-34) surface may block the acid sites. Moreover, the metal dispersion over both catalysts is below 10%. Based on the comparison, various factors could influence the adsorption of NH_3 and NO over the catalyst surface. The high specific surface area could provide abundant adsorption sites, which increase the adsorption capacity. Also, the multiple locations of acid spots along a wide temperature range, which are seen over Cu/SAPO-34, could continuously maintain the adsorption of NH_3 and NO even at elevated temperature.","abstract_html":"In this study, Copper supported on SAPO-34 molecular sieves or alumina is prepared via an incipient wetness impregnation method for ammonia selective catalytic reduction (NH_3-SCR). These NH_3-SCR catalysts are characterized by pulse chemisorption, temperature-programmed reduction (TPR), and temperature-programmed desorption (TPD) with three different conditions (NH_3, NO, combined NH_3-NO) to evaluate the adsorption of ammonia and nitric oxide. Cu/SAPO-34 catalyst has shown higher ammonia adsorption capacity compared to Cu/Al_2O_3 catalyst. The Cu/SAPO-34 adsorption is enhanced due to the strong acidity and high surface area of SAPO-34 molecular sieves. NO adsorption peaks over both catalysts are small (for NO-TPD) and these peaks become broader when a combined NH_3-NO is introduced to the system. However, Cu/SAPO-34 & Cu/Al_2O_3 surface area and acidity are decreased dramatically comparing to SAPO-34 and Al_2O_3 supports. These observations are verified by TPR and CO chemisorption. The formation of bulk copper aluminate over (Cu/Al_2O_3) surface and CuO over (Cu/SAPO-34) surface may block the acid sites. Moreover, the metal dispersion over both catalysts is below 10%. Based on the comparison, various factors could influence the adsorption of NH_3 and NO over the catalyst surface. The high specific surface area could provide abundant adsorption sites, which increase the adsorption capacity. Also, the multiple locations of acid spots along a wide temperature range, which are seen over Cu/SAPO-34, could continuously maintain the adsorption of NH_3 and NO even at elevated temperature.","abstract_has_math":false,"creators":["Rawah, Basil"],"institution":null,"degree_name":"Master of Science in Chemical Engineering - (M.S.)","degree_level":null,"degree_discipline":"Chemical, Biological and Pharmaceutical Engineering","degree_department":null,"school":null,"contributors":["Xianqin Wang","R. P. T. Tomkins","Robert Benedict Barat"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2017,"date_issued":"2017-05-31T07:00:00Z","date_published":"2017-05-31T07:00:00Z","updated_at":"2026-07-24T03:22:07Z","subjects":["NH3 adsorption","NO adsorption","Copper","Chemical Engineering"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://digitalcommons.njit.edu/theses/27","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Xianqin Wang","R. P. T. Tomkins","Robert Benedict Barat"]},{"key":"dc:creator","label":"Author","values":["Rawah, Basil"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Chemical, Biological and Pharmaceutical Engineering"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science in Chemical Engineering - (M.S.)"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["NH3 adsorption","NO adsorption","Copper","Chemical Engineering"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://digitalcommons.njit.edu/theses/27"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["In this study, Copper supported on SAPO-34 molecular sieves or alumina is prepared via an incipient wetness impregnation method for ammonia selective catalytic reduction (NH_3-SCR). These NH_3-SCR catalysts are characterized by pulse chemisorption, temperature-programmed reduction (TPR), and temperature-programmed desorption (TPD) with three different conditions (NH_3, NO, combined NH_3-NO) to evaluate the adsorption of ammonia and nitric oxide. Cu/SAPO-34 catalyst has shown higher ammonia adsorption capacity compared to Cu/Al_2O_3 catalyst. The Cu/SAPO-34 adsorption is enhanced due to the strong acidity and high surface area of SAPO-34 molecular sieves. NO adsorption peaks over both catalysts are small (for NO-TPD) and these peaks become broader when a combined NH_3-NO is introduced to the system. However, Cu/SAPO-34 & Cu/Al_2O_3 surface area and acidity are decreased dramatically comparing to SAPO-34 and Al_2O_3 supports. These observations are verified by TPR and CO chemisorption. The formation of bulk copper aluminate over (Cu/Al_2O_3) surface and CuO over (Cu/SAPO-34) surface may block the acid sites. Moreover, the metal dispersion over both catalysts is below 10%. Based on the comparison, various factors could influence the adsorption of NH_3 and NO over the catalyst surface. The high specific surface area could provide abundant adsorption sites, which increase the adsorption capacity. Also, the multiple locations of acid spots along a wide temperature range, which are seen over Cu/SAPO-34, could continuously maintain the adsorption of NH_3 and NO even at elevated temperature."]},{"key":"dc:title","label":"Title","values":["Investigation of NH3 and no adsorption over Cu/SAPO-34 and Cu/AlOo3 catalysts for NH3–SCR system"]}]}],"canonical_facts":{"dc:contributor":["Xianqin Wang","R. P. T. Tomkins","Robert Benedict Barat"],"dc:creator":["Rawah, Basil"],"dc:description.abstract":["In this study, Copper supported on SAPO-34 molecular sieves or alumina is prepared via an incipient wetness impregnation method for ammonia selective catalytic reduction (NH_3-SCR). These NH_3-SCR catalysts are characterized by pulse chemisorption, temperature-programmed reduction (TPR), and temperature-programmed desorption (TPD) with three different conditions (NH_3, NO, combined NH_3-NO) to evaluate the adsorption of ammonia and nitric oxide. Cu/SAPO-34 catalyst has shown higher ammonia adsorption capacity compared to Cu/Al_2O_3 catalyst. The Cu/SAPO-34 adsorption is enhanced due to the strong acidity and high surface area of SAPO-34 molecular sieves. NO adsorption peaks over both catalysts are small (for NO-TPD) and these peaks become broader when a combined NH_3-NO is introduced to the system. However, Cu/SAPO-34 & Cu/Al_2O_3 surface area and acidity are decreased dramatically comparing to SAPO-34 and Al_2O_3 supports. These observations are verified by TPR and CO chemisorption. The formation of bulk copper aluminate over (Cu/Al_2O_3) surface and CuO over (Cu/SAPO-34) surface may block the acid sites. Moreover, the metal dispersion over both catalysts is below 10%. Based on the comparison, various factors could influence the adsorption of NH_3 and NO over the catalyst surface. The high specific surface area could provide abundant adsorption sites, which increase the adsorption capacity. Also, the multiple locations of acid spots along a wide temperature range, which are seen over Cu/SAPO-34, could continuously maintain the adsorption of NH_3 and NO even at elevated temperature."],"dc:identifier":["https://digitalcommons.njit.edu/theses/27"],"dc:subject":["NH3 adsorption","NO adsorption","Copper","Chemical Engineering"],"dc:title":["Investigation of NH3 and no adsorption over Cu/SAPO-34 and Cu/AlOo3 catalysts for NH3–SCR system"],"dc:type":["Thesis"],"thesis:degree_discipline":["Chemical, Biological and Pharmaceutical Engineering"],"thesis:degree_name":["Master of Science in Chemical Engineering - (M.S.)"]},"updated_at":"2026-07-24T03:22:07Z"}