carrier catalyst kunye zeolite

Sisebenzisa iikuki ukuphucula amava akho. Ngokuqhubeka nokukhangela le sayithi, uyavumelana nokusebenzisa kwethu iikuki. Iinkcukacha ezithe xaxe.
Eli nqaku ligxininise kwiipropati ze-asidi yomphezulu we-oxide catalysts kunye neenkxaso (γ-Al2O3, CeO2, ZrO2, SiO2, TiO2, HZSM5 zeolite) kunye nokufumanisa okuthelekisayo kweendawo zabo ngokulinganisa i-desorption ye-ammonia ecwangcisiweyo (ATPD). I-ATPD yindlela ethembekileyo nelula apho umphezulu, emva kokuba ugcwele i-ammonia kwiqondo eliphantsi lobushushu, utshintsha ubushushu, nto leyo ekhokelela ekugxothweni kweemolekyuli zeprobe kunye nokusabalalisa ubushushu.
Ngokuhlalutya kobungakanani kunye / okanye ubunjani bepateni ye-desorption, ulwazi lunokufumaneka kumandla we-desorption / adsorption kunye nobungakanani be-ammonia ebhengeziweyo kumphezulu (i-ammonia uptake). Njengemolekyuli esisiseko, i-ammonia ingasetyenziswa njenge probe ukumisela ubumuncu bomphezulu. Ezi datha zinokunceda ukuqonda ukuziphatha kwe-catalytic yeisampulu kwaye zincede ukulungisa kakuhle udibaniso lweenkqubo ezintsha. Esikhundleni sokusebenzisa i-TCD detector yendabuko, i-quadrupole mass spectrometer (i-Hiden HPR-20 QIC) isetyenziswe kumsebenzi, ixhunywe kwisixhobo sokuvavanya nge-capillary evuthayo.
Ukusetyenziswa kwe-QMS kusenza sikwazi ukwahlula ngokulula phakathi kweentlobo ezahlukeneyo ze-desorbed ukusuka kumphezulu ngaphandle kokusetyenziswa kwaziphi na izihlungi zekhemikhali okanye zomzimba kunye nemigibe enokuthi ichaphazele kakubi uhlalutyo. Ukumiselwa ngokufanelekileyo kwesixhobo se-ionization yesixhobo kunceda ukuthintela ukuhlukana kwamamolekyuli amanzi kunye nokuphazamiseka okubangelwa ngumqondiso we-ammonia m / z. Ukuchaneka kunye nokuthembeka kwedatha ye-ammonia ye-desorption yeqondo lokushisa yahlaziywa ngokusebenzisa i-criteria yethiyori kunye neemvavanyo zokuvavanya, ukugqamisa imiphumo yendlela yokuqokelela idatha, i-carrier gas, ubukhulu be-particle size, kunye nejometri ye-reactor, ebonisa ukuguquguquka kwendlela esetyenziswayo.
Zonke izixhobo ezifundiweyo zineendlela ezintsonkothileyo ze-ATPD ezithatha kuluhlu lwe-423-873K, ngaphandle kwe-cerium, ebonisa ukusonjululwa kweencopho ze-desorption emxinwa ebonisa i-asidi ephantsi efanayo. Idatha ye-quantitative ibonisa ukungafani kwi-ammonia efunyenwe phakathi kwezinye izinto kunye ne-silica ngaphezu komyalelo wobukhulu. Ekubeni ukuhanjiswa kwe-ATPD ye-cerium ilandela ijika le-Gaussian kungakhathaliseki ukugquma komhlaba kunye nezinga lokufudumeza, ukuziphatha kwezinto eziphantsi kwesifundo kuchazwa njengomgca wemisebenzi emine ye-Gaussian ehambelana nokudityaniswa kwamaqela aphakathi, abuthathaka, anamandla, kwaye anamandla kakhulu. . Emva kokuba yonke idatha iqokelelwe, uhlalutyo lwemodeli ye-ATPD lusetyenziswe ukunceda ukufumana ulwazi malunga namandla e-adsorption ye-molecule ye-probe njengomsebenzi weqondo lokushisa ngalinye. Ukuhanjiswa kwamandla okongezelekayo ngendawo kubonisa la maxabiso alandelayo e-asidi esekelwe kumaxabiso aphakathi kwamandla (kwi-kJ/mol) (umzekelo, ukugquma komphezulu θ = 0.5).
Njengoko i-probe reaction, i-propene yayiphantsi kwe-dehydration ye-isopropanol ukufumana ulwazi olongezelelweyo malunga nokusebenza kwezinto eziphantsi kokufundwa. Iziphumo ezifunyenweyo zihambelana nemilinganiselo yangaphambili ye-ATPD ngokubhekiselele kumandla kunye nobuninzi beendawo ze-asidi ezingaphezulu, kwaye zenza kube lula ukwahlula phakathi kweendawo ze-Brønsted kunye ne-Lewis acid.
Umzobo 1. (Ekhohlo) I-Deconvolution yeprofayili ye-ATPD usebenzisa umsebenzi we-Gaussian (umgca onamachaphaza omthubi umele iprofayili eyenziwe, amachaphaza amnyama yidatha yovavanyo) (ekunene) i-ammonia desorption umsebenzi wokuhambisa amandla kwiindawo ezahlukeneyo.
URoberto Di Cio iFaculty yobuNjineli, iYunivesithi yaseMessina, Contrada Dee Dee, Sant'Agata, I-98166 Messina, Italy
UFrancesco Arena, uRoberto Di Cio, uGiuseppe Trunfio (2015) "UVavanyo loVavanyo lwe-Ammonia Ubushushu obucwangcisiweyo be-Desorption Method yokuPhanda iiPropati ze-Acid ye-Heterogeneous Catalyst Surfaces" iSetyenziselwe iCatalysis A: Hlaziya i-503, i-227-236
Fihla uhlalutyo. (NgoFebruwari 9, 2022). Uvavanyo lovavanyo lwendlela yobushushu obucwangcisiweyo bokuchithwa kwe-ammonia ukuze kufundwe iimpawu zeasidi kwimiphezulu engafaniyo yee-catalysts. AZ. Ibuyiselwe nge-7 kaSeptemba 2023 ukusuka ku-https://www.azom.com/article.aspx?ArticleID=14016.
Fihla uhlalutyo. "UVavanyo loVavanyo lweNdlela ye-Ammonia eCwangcisiweyo yokuTyelwa koBubushushu bokufunda iiPropati ze-Acid ze-Heterogeneous Catalyst Surfaces". AZ. NgoSeptemba 7, 2023 .
Fihla uhlalutyo. "UVavanyo loVavanyo lweNdlela ye-Ammonia eCwangcisiweyo yokuTyelwa koBubushushu bokuFundisa iiPropati ze-Acid zeMihlaba ye-Heterogeneous Catalyst". AZ. https://www.azom.com/article.aspx?ArticleID=14016. (Kufikelelwe kwi: Septemba 7, 2023).
Fihla uhlalutyo. 2022. Uvavanyo lovavanyo lwendlela yobushushu ecwangcisiweyo yeammonia yokuphonononga iipropathi ezineasidi zemiphezulu ye-heterogeneous catalyst. I-AZoM, ifunyenwe nge-7 Septemba 2023, https://www.azom.com/article.aspx?ArticleID=14016.