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Sengoliloeng sena se tsepamisitse maikutlo holim'a acidity ea holim'a li-catalysts tsa oxide le litšehetso (γ-Al2O3, CeO2, ZrO2, SiO2, TiO2, HZSM5 zeolite) le ho lemoha ho bapisoa ha libaka tsa bona ka ho lekanya mocheso o hlophisitsoeng oa ammonia desorption (ATPD). ATPD ke mokhoa o ka tšeptjoang le o bonolo oo holim'a metsi, ka mor'a ho tlala ammonia ka mocheso o tlaase, o fetoha mocheso, o lebisang ho senyeha ha limolek'hule tsa probe hammoho le ho aroloa ha mocheso.
Ka tlhahlobo ea palo le/kapa ea boleng ba mokhoa oa desorption, tlhaiso-leseling e ka fumanoa ka matla a desorption / adsorption le bongata ba ammonia e adsorbed holim'a metsi (ammonia uptake). Joaloka molek'hule ea motheo, ammonia e ka sebelisoa e le probe ho fumana hore na acidity e holim'a metsi ke efe. Lintlha tsena li ka thusa ho utloisisa boitšoaro ba lisampole esita le ho thusa ho hlophisa mekhoa e mecha. Ho e-na le ho sebelisa mochine o tloaelehileng oa TCD, mochine oa quadrupole mass spectrometer (Hiden HPR-20 QIC) o ile oa sebelisoa mosebetsing oo, o kopantsoeng le sesebelisoa sa teko ka capillary e futhumetseng.
Tšebeliso ea QMS e re fa monyetla oa ho khetholla habonolo pakeng tsa mefuta e fapaneng e lahliloeng holim'a metsi ntle le tšebeliso ea lik'hemik'hale leha e le life tsa lik'hemik'hale kapa tsa 'mele le maraba a ka amang tlhahlobo e mpe. Tlhophiso e nepahetseng ea bokhoni ba ionization ea sesebelisoa e thusa ho thibela ho arohana ha limolek'hule tsa metsi le ho kena-kenana le sesupo sa ammonia m/z. Ho nepahala le ho ts'epahala ha lintlha tsa mocheso o hlophisitsoeng oa ammonia desorption li ile tsa hlahlojoa ho sebelisoa mekhoa ea theoretical le liteko tsa liteko, ho totobatsa liphello tsa mokhoa oa ho bokella lintlha, khase e tsamaisang thepa, boholo ba likaroloana, le geometry ea reactor, e bontšang ho feto-fetoha ha mokhoa o sebelisoang.
Lisebelisoa tsohle tse ithutoang li na le mekhoa e rarahaneng ea ATPD ho tloha ho 423-873K, ntle le cerium, e bonts'ang litlhōrō tse moqotetsane tsa desorption tse bontšang acidity e tlaase. Lintlha tse ngata li bontša phapang pakeng tsa ho kenngoa ha ammonia pakeng tsa lisebelisoa tse ling le silica ka ho feta taelo ea boholo. Kaha kabo ea ATPD ea cerium e latela lekhalo la Gaussia ho sa tsotelehe sekoaelo sa bokaholimo le sekhahla sa ho futhumatsa, boitšoaro ba lintho tse ithutoang bo hlalosoa e le moeli oa mesebetsi e mene ea Gaussia e amanang le motsoako oa lihlopha tsa libaka tse itekanetseng, tse fokolang, tse matla le tse matla haholo. . Ha lintlha tsohle li se li bokeletsoe, tlhahlobo ea mohlala ea ATPD e ile ea sebelisoa ho thusa ho fumana tlhahisoleseling mabapi le matla a adsorption a molek'hule ea probe e le ts'ebetso ea mocheso o mong le o mong oa desorption. Kabo ea matla e ntseng e eketseha ho ea ka sebaka e bonts'a maemo a acidity a latelang a ipapisitseng le litekanyetso tse tloaelehileng tsa matla (ka kJ/mol) (mohlala, tšireletso ea bokaholimo θ = 0.5).
E le karabelo ea probe, propene e ne e le tlas'a dehydration ea isopropanol ho fumana boitsebiso bo eketsehileng mabapi le ts'ebetso ea lisebelisoa tse ntseng li ithutoa. Liphetho tse fumanoeng li ne li lumellana le litekanyo tse fetileng tsa ATPD mabapi le matla le bongata ba libaka tsa acid e holim'a metsi, hape li entse hore ho khonehe ho khetholla libaka tsa Brønsted le Lewis acid.
Setšoantšo sa 1. (Ka ho le letšehali) Deconvolution ea setšoantšo sa ATPD ho sebelisa mosebetsi oa Gaussian (mola o mosehla o nang le matheba a emela setšoantšo se hlahisitsoeng, matheba a matšo ke data ea liteko) (ka ho le letona) mosebetsi oa ho tsamaisa matla a ammonia libakeng tse sa tšoaneng.
Roberto Di Cio Faculty of Engineering, Univesithi ea Messina, Contrada Dee Dee, Sant'Agata, I-98166 Messina, Italy
Francesco Arena, Roberto Di Cio, Giuseppe Trunfio (2015) "Tlhahlobo ea Teko ea Ammonia Temperature-Programmed Desorption Method bakeng sa ho Fuputsa Thepa ea Acid ea Heterogeneous Catalyst Surfaces" E sebelisitsoe Catalysis A: Tlhahlobo 503, 227-236
Pata li-analytics. (Hlakola 9, 2022). Tekolo ea liteko ea mokhoa oa ho theola ammonia ka mocheso o hlophisitsoeng ho ithuta boleng ba asiti ea libaka tse fapaneng tsa li-catalyst. AZ. E tsositsoe ka la 7 Loetse 2023 ho tsoa ho https://www.azom.com/article.aspx?ArticleID=14016.
Pata li-analytics. "Tlhahlobo ea Teko ea Mokhoa oa Mocheso o Hlophisitsoeng oa Ammonia bakeng sa ho Ithuta Likarolo tsa Asiti tsa Libaka tse sa tšoaneng tsa Catalyst". AZ. La 7 Loetse 2023
Pata li-analytics. "Tlhahlobo ea Teko ea Mocheso o Hlophisitsoeng oa Ammonia Desorption Method bakeng sa ho Ithuta Lintho tsa Acid tsa Heterogeneous Catalyst Surfaces". AZ. https://www.azom.com/article.aspx?ArticleID=14016. (E fumaneha: Loetse 7, 2023).
Pata li-analytics. 2022. Tekolo ea liteko ea mokhoa o hlophisitsoeng oa ammonia desorption oa mocheso bakeng sa ho ithuta libopeho tsa asiti tsa libaka tse fapaneng tsa li-catalyst. AZoM, e fihletsoe ka la 7 Loetse 2023, https://www.azom.com/article.aspx?ArticleID=14016.
Nako ea poso: Sep-07-2023
