sidaha iyo zeolite

Waxaan isticmaalnaa cookies si aan u wanaajino khibradaada. Markaad sii waddo baadhitaanka boggan, waxaad ogolaatay isticmaalkayada cookies-ka. Macluumaad dheeraad ah.
Maqaalkani waxa uu diiradda saarayaa sifooyinka aashitada dusha sare ee kicinta oksaydhka iyo taageerada (γ-Al2O3, CeO2, ZrO2, SiO2, TiO2, HZSM5 zeolite) iyo ogaanshaha isbarbardhigga ee sagxaddooda iyada oo la cabbirayo heerkulka-ku-barnaamijka ammonia desorption (ATPD). ATPD waa hab la isku halayn karo oo fudud kaas oo dusha sare, ka dib marka lagu dheregsan yahay ammonia heerkulka hooseeya, uu maro isbeddel heerkul ah, taas oo horseedaysa jajabinta unugyada baaritaanka iyo sidoo kale qaybinta heerkulka.
Marka la eego tirada iyo/ama falanqaynta tayada leh ee qaabka qallafsanaanta, macluumaadka waxaa laga heli karaa tamarta desorption/adsorption iyo qadarka ammonia ee lagu dhejiyay dusha sare (ammonia qaadashada). Sida molecule aasaasiga ah, ammonia waxaa loo isticmaali karaa baaritaan ahaan si loo go'aamiyo aysidhka dusha sare. Xogtaasi waxay gacan ka geysan kartaa in la fahmo hab-dhaqanka catalytic ee shaybaarrada iyo xitaa caawinta hagaajinta isku-dhafka hababka cusub. Halkii laga isticmaali lahaa aaladaha TCD-ga caadiga ah, spectrometer-ka quadrupole mass spectrometer (Hiden HPR-20 QIC) ayaa loo isticmaalay hawsha, iyadoo lagu xiray aaladda tijaabada iyada oo loo marayo xidid kulul.
Isticmaalka QMS waxa ay noo ogolaanaysaa in aan si fudud u kala saarno noocyada kala duwan ee laga soo saaray dusha sare iyada oo aan la isticmaalin wax kiimiko ah ama filtarrada jireed iyo dabinka si xun u saameeya falanqaynta. Dejinta saxda ah ee awooda ionization qalabku waxay caawisaa ka hortagga kala-goynta unugyada biyaha iyo faragelinta ka dhalanaysa calaamada ammonia m/z. Saxnaanta iyo isku halaynta xogta kaydinta ammonia-ku-ku-ku-ku-habboonaanta ayaa la falanqeeyay iyada oo la adeegsanayo shuruudaha aragtida iyo tijaabooyinka tijaabada ah, iyada oo la muujinayo saamaynta habka ururinta xogta, gaasta qaadaha, cabbirka walxaha, iyo geometry reactor, taas oo muujinaysa dabacsanaanta habka loo isticmaalo.
Dhammaan agabka la daraaseeyay waxay leeyihiin habab adag oo ATPD ah oo ka kooban 423-873K, marka laga reebo cerium, taas oo muujisa meelaha ugu sarreeya ee xaalufinta cidhiidhiga ah ee la xaliyay taasoo muujinaysa asiidh hooseeya oo isku mid ah. Xogta tiro-koobku waxay tilmaamaysaa kala duwanaanshaha qaadashada ammonia ee u dhaxaysa agabka kale iyo silica in ka badan siday u kala horreeyeen. Maaddaama qaybinta ATPD ee cerium ay raacdo qalooca Gaussian iyadoon loo eegin daboolka dusha sare iyo heerka kulaylka, habdhaqanka walxaha daraasadda lagu qeexay ayaa lagu tilmaamay inay tahay linearity afar hawlood oo Gaussian ah oo la xidhiidha isku-dhafka dhexdhexaadka ah, daciifka ah, xooggan, iyo kooxaha goobta aad u xoogan. . Marka xogta oo dhan la ururiyo, falanqaynta qaabaynta ATPD ayaa lagu dabaqay si ay u caawiso helida macluumaadka tamarta adsorption ee molecule baadhitaanka iyada oo shaqaynaysa heerkul kasta oo qallafsan. Qaybinta tamarta isugeynta goob ahaan waxay tusinaysaa qiimayaasha acidity ee soo socda ee ku salaysan celceliska qiimaha tamarta (kJ/mol) (tusaale daboolka dusha sare θ = 0.5).
Dareen-celinta baaritaanka, propene waxaa lagu soo rogay fuuq-baxa isopropanol si loo helo macluumaad dheeraad ah oo ku saabsan shaqeynta walxaha daraasadda. Natiijooyinka la helay waxay la socdeen cabbirradii hore ee ATPD marka la eego xoogga iyo tirada badan ee goobaha aashitada oogada, waxayna sidoo kale suurtagelisay in la kala saaro goobaha Brønsted iyo Lewis acid.
Jaantuska 1. (Bidix) Deconvolution ee astaanta ATPD iyadoo la adeegsanayo shaqada Gaussian (khadka dhibcaha jaalaha ah wuxuu u taagan yahay astaanta la sameeyay, dhibco madow waa xog tijaabo ah) (midig) Qaybinta tamarta ammonia ee qaybinta tamarta meelo kala duwan.
Roberto Di Cio Kulliyadda Injineerinka, Jaamacadda Messina, Contrada Dee Dee, Sant'Agata, I-98166 Messina, Italy
Francesco Arena.
Qari falanqaynta. (February 9, 2022). Qiimaynta tijaabada ee habka heerkulku-barnaamij-jabka ee ammonia si loo barto sifooyinka aashitada ee sagxadaha kala duwan ee kiciyayaasha. AZ Laga soo celiyay Sebtembar 7, 2023 https://www.azom.com/article.aspx?ArticleID=14016.
Qari falanqaynta. "Qiimaynta Tijaabada Hab-Qasafka Ammonia Heerkulka-Barnaamijka ah ee lagu baranayo sifooyinka aysiidhka ee Dusha sare ee Heterogeneous Catalyst". AZ Sebtember 7, 2023 .
Qari falanqaynta. "Qiimaynta Tijaabada ee Habka Xaalufinta Ammonia-Barnaamijka Heerkulka ee loogu talagalay Barashada Sifooyinka Aysiidhka ee Dusha sare ee Heterogeneous Catalyst". AZ https://www.azom.com/article.aspx?ArticleID=14016. (la helay: Sebtembar 7, 2023).
Qari falanqaynta. 2022. Qiimaynta tijaabada ee hab kul-ku-ku-barnaamijka ammonia desorption si loo barto sifooyinka acidic ee dusha sare ee kicinta kala duwan. AZoM, waxa la galiyay 7 Sebtembar 2023, https://www.azom.com/article.aspx?ArticleID=14016.