chothandizira chothandizira ndi zeolite

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Nkhaniyi ikufotokoza za acidity pamwamba katundu wa oxide catalysts ndi kuthandizira (γ-Al2O3, CeO2, ZrO2, SiO2, TiO2, HZSM5 zeolite) ndi kudziwika poyerekezera malo awo poyeza kutentha-programmed ammonia desorption (ATPD).ATPD ndi njira yodalirika komanso yosavuta yomwe pamwamba, itatha kudzazidwa ndi ammonia pa kutentha kochepa, imasintha kutentha, zomwe zimabweretsa kuwonongeka kwa mamolekyu a probe komanso kugawa kutentha.
Mwa kusanthula kwachulukidwe komanso / kapena kuwunika kwadongosolo la desorption, chidziwitso chikhoza kupezeka pa mphamvu ya desorption / adsorption komanso kuchuluka kwa ammonia komwe kumalengezedwa pamtunda (ammonia uptake).Monga molekyu yofunikira, ammonia angagwiritsidwe ntchito ngati kafukufuku kuti adziwe acidity ya pamwamba.Izi zitha kuthandiza kumvetsetsa momwe zitsanzo zimagwirira ntchito komanso kuwongolera bwino kaphatikizidwe kazinthu zatsopano.M'malo mogwiritsa ntchito chowunikira chachikhalidwe cha TCD, quadrupole mass spectrometer (Hiden HPR-20 QIC) idagwiritsidwa ntchito, yolumikizidwa ku chipangizo choyesera kudzera mu capillary yotentha.
Kugwiritsiridwa ntchito kwa QMS kumatithandiza kusiyanitsa mosavuta pakati pa mitundu yosiyanasiyana ya desorbed kuchokera pamwamba popanda kugwiritsa ntchito mankhwala aliwonse kapena zosefera zakuthupi ndi misampha yomwe ingasokoneze kusanthula.Kukhazikitsa koyenera kwa mphamvu ya ionization ya chida kumathandiza kupewa kugawikana kwa mamolekyu amadzi komanso kusokoneza chizindikiro cha ammonia m/z.Kulondola ndi kudalirika kwa kutentha kwa ndondomeko ya ammonia desorption deta anawunikidwa pogwiritsa ntchito mfundo zamaganizo ndi mayesero oyesera, kuwonetsa zotsatira za njira yosonkhanitsira deta, mpweya wonyamulira, kukula kwa tinthu, ndi geometry ya reactor, kusonyeza kusinthasintha kwa njira yogwiritsidwa ntchito.
Zida zonse zomwe zimaphunziridwa zimakhala ndi mitundu yovuta ya ATPD yomwe imatenga 423-873K, kupatula cerium, yomwe imawonetsa nsonga zopapatiza zosonyeza kutsika kwa acidity.Deta yochuluka imasonyeza kusiyana kwa kutengeka kwa ammonia pakati pa zipangizo zina ndi silika ndi zambiri kuposa dongosolo la ukulu.Popeza kugawidwa kwa ATPD kwa cerium kumatsatira curve ya Gaussian mosasamala kanthu za kuphimba pamwamba ndi kutentha kwa kutentha, khalidwe la zinthu zomwe zikuphunziridwa zikufotokozedwa ngati mzere wa ntchito zinayi za Gaussian zomwe zimagwirizanitsidwa ndi kuphatikiza kwapakati, ofooka, amphamvu, ndi magulu amphamvu kwambiri. .Deta yonse itasonkhanitsidwa, kusanthula kwachitsanzo kwa ATPD kunagwiritsidwa ntchito kuti athandizire kupeza zambiri za mphamvu ya adsorption ya molekyulu ya probe ngati ntchito ya kutentha kulikonse.Kugawidwa kwa mphamvu kochulukira ndi malo kumawonetsa acidity zotsatirazi kutengera mphamvu zapakati (mu kJ/mol) (mwachitsanzo, kuphimba pamwamba θ = 0.5).
Monga kafukufuku anachita, propene anali pansi madzi m`thupi la isopropanol kupeza zambiri zokhudza magwiridwe a zipangizo kuphunzira.Zotsatira zomwe zinapezedwa zinali zogwirizana ndi miyeso yam'mbuyo ya ATPD ponena za mphamvu ndi kuchuluka kwa malo a asidi pamtunda, komanso zinapangitsa kuti zikhale zotheka kusiyanitsa pakati pa malo a Brønsted ndi Lewis acid.
Chithunzi 1. (Kumanzere) Deconvolution ya mbiri ya ATPD pogwiritsa ntchito ntchito ya Gaussian (mzere wachikasu wamadontho umayimira mbiri yopangidwa, madontho akuda ndi data yoyesera) (kumanja) Ammonia desorption ntchito yogawa mphamvu 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 Ammonia Temperature-Programmed Desorption Method pofufuza za Acid of Heterogeneous Catalyst Surfaces" Yogwiritsidwa Ntchito Catalysis A: Review 503, 227-236
Bisani analytics.(February 9, 2022).Kuyesa njira ya kutentha-programmed desorption wa ammonia kuphunzira asidi katundu wa heterogeneous pamalo chothandizira.AZ.Inabwezedwa pa Seputembara 7, 2023 kuchokera ku https://www.azom.com/article.aspx?ArticleID=14016.
Bisani analytics."Kuyesa Kuyesa kwa Njira Yowotchera Kutentha kwa Ammonia Yopangidwira Kuphunzira za Acid Pamalo Osiyanasiyana a Catalyst".AZ.Seputembara 7, 2023 .
Bisani analytics."Kuyesa Kuyesa kwa Kutentha-Yopangidwa ndi Ammonia Desorption Njira Yophunzirira Ma Acid Pamalo Osiyanasiyana Othandizira".AZ.https://www.azom.com/article.aspx?ArticleID=14016.(Chafikira: Seputembara 7, 2023).
Bisani analytics.2022. Kuwunika koyeserera kwa kutentha-programmed ammonia desorption njira yophunzirira za acidic za malo opangira zinthu zosiyanasiyana.AZoM, idapezeka pa 7 September 2023, https://www.azom.com/article.aspx?ArticleID=14016.