catalyst carrier uye zeolite

Isu tinoshandisa makuki kuvandudza ruzivo rwako. Nekuramba uchitsvaga saiti ino, unobvuma kushandisa kwedu makuki. Mamwe mashoko.
Ichi chinyorwa chinotarisa pamusoro pe acidity yepamusoro ye oxide catalysts uye inotsigira (γ-Al2O3, CeO2, ZrO2, SiO2, TiO2, HZSM5 zeolite) uye kuenzaniswa kwekuonekwa kwezviso zvavo nekuyera tembiricha-programmed ammonia desorption (ATPD). ATPD inzira yakavimbika uye iri nyore iyo iyo nzvimbo, mushure mekuzadzwa neammonia pane yakaderera tembiricha, inopinda tembiricha shanduko, izvo zvinotungamira ku desorption yeprobe mamorekuru pamwe nekugovera tembiricha.
Nehuwandu uye / kana hunhu kuongororwa kweiyo desorption pateni, ruzivo runogona kuwanikwa pane simba re desorption / adsorption uye huwandu hweammonia inoshambadzirwa pamusoro (ammonia uptake). Semamorekuru akakosha, ammonia inogona kushandiswa seprobe kuona iyo acidity yepasi. Idzi data rinogona kubatsira kunzwisisa maitiro anokonzeresa emasampuli uye kunyange kubatsira kukwenenzvera kusanganisa kwemasisitimu matsva. Panzvimbo pekushandisa yechinyakare TCD detector, quadrupole mass spectrometer (Hiden HPR-20 QIC) yakashandiswa mubasa racho, yakabatanidzwa kune bvunzo mudziyo kuburikidza neinopisa capillary.
Kushandiswa kweQMS kunotibvumira kusiyanisa zviri nyore pakati pemarudzi akasiyana-siyana akacheneswa kubva pamusoro pasina kushandisa chero makemikari kana emuviri mafirita uye misungo inogona kukanganisa ongororo. Kurongeka kwakaringana kweiyo ionization yechiridzwa kunobatsira kudzivirira kupatsanuka kwemamorekuru emvura uye kukanganisa kunokonzerwa neiyo ammonia m/z chiratidzo. Kunyatsoita uye kuvimbika kwekushisa-programmed ammonia desorption data yakaongororwa uchishandisa maitiro ezvinyorwa uye miedzo yekuedza, kuratidza migumisiro yekuunganidza data mode, carrier gas, particle size, uye reactor geometry, zvichiratidza kushanduka kwenzira inoshandiswa.
Zvese zvinhu zvakadzidzwa zvine maitiro akaomarara eATPD anotenderera 423-873K renji, kunze kwecerium, iyo inoratidza yakagadziriswa yakatetepa desorption peaks inoratidza yunifomu yakaderera acidity. Nhamba yedata inoratidza mutsauko mukutorwa kweammonia pakati pezvimwe zvinhu uye silica nekupfuura kuraira kwehukuru. Sezvo kugoverwa kweATPD kwecerium kunotevera gaussian curve zvisinei nekuvharika kwepamusoro uye chiyero chekudziya, maitiro ezvinyorwa zviri kudzidza anotsanangurwa semutsara wemabasa mana eGaussian akabatana nekubatanidzwa kwepakati, kushaya simba, kusimba, uye kwakasimba kwazvo mapoka enzvimbo. . Kana data rese raunganidzwa, kuongororwa kweATPD kwekuenzanisa kwakashandiswa kubatsira kuwana ruzivo pamusoro pesimba rekushambadza remorekuru weprobe sebasa re tembiricha yega yega. Kuwedzerwa kwesimba kugoverwa nenzvimbo kunoratidza hunotevera acidity kukosha zvichienderana neavhareji simba kukosha (mu kJ/mol) (semuenzaniso kufukidzwa kwepasi θ = 0.5).
Sezvinoita probe reaction, propene yakaiswa pasi pemvura ye isopropanol kuti iwane rumwe ruzivo nezve kushanda kwezvinhu zviri pasi pekudzidza. Mhedzisiro yakawanikwa yaienderana nezviyero zvekare zveATPD maererano nesimba uye kuwanda kwenzvimbo dzeasidhi, uye zvakare zvakaita kuti zvikwanise kusiyanisa nzvimbo dzeBrønsted neLewis acid.
Mufananidzo 1. (Kuruboshwe) Deconvolution yemufananidzo weATPD uchishandisa basa reGaussian (yellow dotted line inomiririra purogiramu yakagadzirwa, mavara madema ndeye data yekuedza) (kurudyi) Ammonia desorption simba rekugovera basa munzvimbo dzakasiyana-siyana.
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) "Kuongorora Kuongorora kweAmmonia Temperature-Yakarongwa Desorption Method yeKuongorora iyo Acid Properties yeHeterogeneous Catalyst Surfaces" Yakashandiswa Catalysis A: Ongororo 503, 227-236
Viga analytics. (Kukadzi 9, 2022). Ongororo yekuyedza nzira yetembiricha-yakarongwa desorption yeammonia yekudzidza maasidhi emhando dzakasiyana-siyana dzezvinokonzeresa. AZ. Yakadzorerwa Gunyana 7, 2023 kubva https://www.azom.com/article.aspx?ArticleID=14016.
Viga analytics. "Kuongorora Kuongorora kweTembiricha-Yakarongwa Ammonia Desorption Method yeKudzidza iyo Acid Properties yeHeterogeneous Catalyst Surfaces". AZ. Gunyana 7, 2023 .
Viga analytics. "Kuongorora Kuongororwa kweTembiricha-Yakarongwa Ammonia Desorption Method yekudzidza iyo Acid Properties yeHeterogeneous Catalyst Surfaces". AZ. https://www.azom.com/article.aspx?ArticleID=14016. (Yakapinda: Gunyana 7, 2023).
Viga analytics. 2022. Ongororo yekuyedza yetembiricha-yakarongwa ammonia desorption nzira yekudzidza maasidhi ezvimiro zveheterogeneous catalyst nzvimbo. AZoM, yakasvika 7 Gunyana 2023, https://www.azom.com/article.aspx?ArticleID=14016.