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Nkhaniyi ikuyang'ana kwambiri za acidity pamwamba pa zinthu zoyezera ndi zothandizira za oxide (γ-Al2O3, CeO2, ZrO2, SiO2, TiO2, HZSM5 zeolite) komanso kuzindikira koyerekeza kwa malo awo poyesa kutentha komwe kumakonzedwa ndi ammonia desorption (ATPD). ATPD ndi njira yodalirika komanso yosavuta yomwe pamwamba pake, pambuyo poti yadzazidwa ndi ammonia pa kutentha kochepa, imasinthasintha kutentha, zomwe zimapangitsa kuti mamolekyu a probe asungunuke komanso kufalikira kwa kutentha.
Pogwiritsa ntchito kusanthula kwa kuchuluka ndi/kapena kwa khalidwe la kapangidwe ka desorption, chidziwitso chingapezeke pa mphamvu ya desorption/adsorption ndi kuchuluka kwa ammonia yomwe imalowa pamwamba (ammonia uptake). Monga molekyulu yoyambira, ammonia ingagwiritsidwe ntchito ngati probe kuti idziwe acidity ya pamwamba. Deta iyi ingathandize kumvetsetsa momwe zitsanzo zimagwirira ntchito komanso kuthandiza kukonza kapangidwe ka machitidwe atsopano. M'malo mogwiritsa ntchito chowunikira cha TCD chachikhalidwe, quadrupole mass spectrometer (Hiden HPR-20 QIC) idagwiritsidwa ntchito pantchitoyi, yolumikizidwa ku chipangizo choyesera kudzera mu capillary yotentha.
Kugwiritsa ntchito QMS kumatithandiza kusiyanitsa mosavuta mitundu yosiyanasiyana yochotsedwa pamwamba popanda kugwiritsa ntchito mankhwala kapena zosefera zakuthupi ndi misampha yomwe ingakhudze kusanthula. Kukhazikitsa bwino mphamvu ya ionization ya chipangizochi kumathandiza kupewa kugawikana kwa mamolekyu amadzi ndi kusokoneza komwe kumachitika ndi chizindikiro cha ammonia m/z. Kulondola ndi kudalirika kwa deta yochotsedwa kwa ammonia yokonzedwa ndi kutentha kunasanthulidwa pogwiritsa ntchito njira zophunzirira ndi mayeso oyesera, kuwonetsa zotsatira za njira yosonkhanitsira deta, mpweya wonyamula, kukula kwa tinthu tating'onoting'ono, ndi geometry ya reactor, kuwonetsa kusinthasintha kwa njira yomwe yagwiritsidwa ntchito.
Zipangizo zonse zomwe zaphunziridwa zili ndi njira zovuta za ATPD zomwe zimafikira pa 423-873K, kupatula cerium, yomwe imawonetsa nsonga zopapatiza zosungunuka zomwe zikusonyeza kuti asidi wochepa. Deta yochuluka imasonyeza kusiyana kwa kutengedwa kwa ammonia pakati pa zinthu zina ndi silika ndi kuchuluka kopitilira muyeso. Popeza kufalikira kwa ATPD kwa cerium kumatsatira curve ya Gaussian mosasamala kanthu za kuphimba pamwamba ndi kutentha, khalidwe la zinthu zomwe zikuphunziridwa likufotokozedwa ngati mzere wa ntchito zinayi za Gaussian zogwirizana ndi kuphatikiza kwa magulu apakati, ofooka, amphamvu, komanso amphamvu kwambiri. Deta yonse itasonkhanitsidwa, kusanthula kwa ATPD kunagwiritsidwa ntchito kuti kuthandize kupeza chidziwitso cha mphamvu yolowetsera ya molekyulu ya probe ngati ntchito ya kutentha kulikonse kwa desorption. Kugawidwa kwa mphamvu kophatikizana ndi malo kukuwonetsa ma acidity otsatirawa kutengera ma energy values apakati (mu kJ/mol) (monga kuphimba pamwamba θ = 0.5).
Monga njira yofufuzira, propene idanyowa madzi mu isopropanol kuti ipeze zambiri zokhudzana ndi momwe zinthu zomwe zinali kuphunziridwa zimagwirira ntchito. Zotsatira zomwe zidapezeka zinali zogwirizana ndi miyeso yapitayi ya ATPD pankhani ya mphamvu ndi kuchuluka kwa malo okhala ndi asidi pamwamba, komanso zidapangitsa kuti zikhale zotheka kusiyanitsa malo okhala ndi asidi a Brønsted ndi Lewis.
Chithunzi 1. (Kumanzere) Kuchotsa mbiri ya ATPD pogwiritsa ntchito ntchito ya Gaussian (mzere wachikasu wokhala ndi madontho ukuyimira mbiri yopangidwa, madontho akuda ndi deta yoyesera) (kumanja) Ntchito yogawa mphamvu ya ammonia desorption m'malo osiyanasiyana.
Roberto Di Cio Faculty of Engineering, University of Messina, Contrada Dee Dee, Sant'Agata, I-98166 Messina, Italy
Francesco Arena, Roberto Di Cio, Giuseppe Trunfio (2015) “Kuyesa Kuyesa kwa Njira Yochotsera Kutentha kwa Ammonia Yoyeserera Pofufuza Katundu wa Asidi wa Malo Osiyanasiyana Othandizira” Applied Catalysis A: Review 503, 227-236
Bisani kusanthula. (February 9, 2022). Kuyesa koyesera njira yochotsera ammonia pogwiritsa ntchito kutentha kuti aphunzire za asidi wa malo osiyanasiyana a ma catalyst. AZ. Yatengedwa pa September 7, 2023 kuchokera ku https://www.azom.com/article.aspx?ArticleID=14016.
Bisani kusanthula. "Kuyesa Njira Yoyesera Yochotsera Ammonia Yokonzedwa ndi Kutentha Pophunzira Makhalidwe a Asidi a Malo Osiyanasiyana Othandizira". AZ. Seputembala 7, 2023
Bisani kusanthula. "Kuyesa Njira Yoyesera Yochotsera Ammonia Yokonzedwa ndi Kutentha Pophunzira Makhalidwe a Asidi a Malo Osiyanasiyana Othandizira". AZ. https://www.azom.com/article.aspx?ArticleID=14016. (Yapezeka: Seputembala 7, 2023).
Bisani kusanthula. 2022. Kuyesa koyesera njira yoyeretsera ammonia yokonzedwa ndi kutentha pophunzira za acidity ya malo osakanikirana a catalyst. AZoM, yopezedwa pa 7 Seputembala 2023, https://www.azom.com/article.aspx?ArticleID=14016.
Nthawi yotumizira: Sep-07-2023
