mea lawe hoʻoheheʻe a me ka zeolite

Hoʻohana mākou i nā kuki e hoʻomaikaʻi i kou ʻike.Ma ka hoʻomau ʻana i kēia pūnaewele, ʻae ʻoe i kā mākou hoʻohana ʻana i nā kuki.ʻIke hou aku.
Ke nānā nei kēia ʻatikala i ka waiwai acidity o ka ʻili o nā mea hoʻoheheʻe oxide a me nā kākoʻo (γ-Al2O3, CeO2, ZrO2, SiO2, TiO2, HZSM5 zeolite) a me ka ʻike hoʻohālikelike o ko lākou mau ʻili ma ke ana ʻana i ka wela-programmed ammonia desorption (ATPD).ʻO ka ATPD kahi ala hilinaʻi a maʻalahi i ka ʻili, ma hope o ka hoʻopiha ʻia ʻana me ka ammonia i ka haʻahaʻa haʻahaʻa, e hoʻololi i ka mahana, kahi e alakaʻi ai i ka desorption o nā molekele probe a me ka hāʻawi ʻana i ka mahana.
Ma o ka quantitative a / a qualitative analysis of the desorption pattern, hiki ke loaʻa ka ʻike ma ka ikehu o ka desorption/adsorption a me ka nui o ka ammonia adsorbed ma ka ʻili (ammonia uptake).Ma ke ʻano he molela kumu, hiki ke hoʻohana ʻia ka amonia ma ke ʻano he ʻimi e hoʻoholo ai i ka ʻakika o kahi ʻili.Hiki i kēia mau ʻikepili ke kōkua i ka hoʻomaopopo ʻana i ke ʻano catalytic o nā laʻana a kōkua pū i ka hoʻoponopono maikaʻi ʻana i ka synthesis o nā ʻōnaehana hou.Ma kahi o ka hoʻohana ʻana i ka mea ʻike TCD kuʻuna, ua hoʻohana ʻia kahi quadrupole mass spectrometer (Hiden HPR-20 QIC) i ka hana, i hoʻopili ʻia i ka mea hoʻāʻo ma o ka capillary wela.
ʻO ka hoʻohana ʻana iā QMS hiki iā mākou ke ʻike maʻalahi ma waena o nā ʻano ʻano like ʻole i hoʻokaʻawale ʻia mai ka ʻili me ka hoʻohana ʻole ʻana i nā kānana kemika a kino a me nā pahele e hiki ke hoʻopilikia i ka nānā ʻana.ʻO ka hoʻonohonoho pono ʻana i ka hiki ke hoʻokaʻawale ʻia o ka mea kani ke kōkua i ka pale ʻana i ka ʻāpana o nā molekole wai a me ka hopena o ka hoʻopilikia ʻana i ka hōʻailona ammonia m/z.Hoʻopili ʻia ka pololei a me ka hilinaʻi o ka ʻikepili desorption ammonia i hoʻonohonoho ʻia i ka mahana me ka hoʻohana ʻana i nā ʻōlelo aʻoaʻo a me nā hoʻokolohua hoʻokolohua, e hōʻike ana i nā hopena o ke ʻano o ka hōʻiliʻili ʻikepili, ke kinoea halihali, ka nui o ka ʻāpana, a me ka geometry reactor, e hōʻike ana i ka maʻalahi o ke ʻano i hoʻohana ʻia.
Loaʻa i nā mea a pau i aʻo ʻia nā ʻano ATPD paʻakikī i ka laulā 423-873K, koe naʻe ka cerium, e hōʻike ana i nā piko desorption haiki i hoʻoholo ʻia e hōʻike ana i ka like ʻole o ka acidity haʻahaʻa.Hōʻike ka ʻikepili helu i nā ʻokoʻa o ka lawe ʻana i ka ammonia ma waena o nā mea ʻē aʻe a me ka silica ma mua o kahi kauoha o ka nui.Ma muli o ka hāʻawi ʻana o ka ATPD o ka cerium e hahai ana i ka pihi Gaussian me ka nānā ʻole i ka uhi ʻana o ka ʻili a me ka helu wela, ua wehewehe ʻia ke ʻano o ka mea i aʻo ʻia ma ke ʻano he linearity o ʻehā mau hana Gaussian e pili ana me ka hui pū ʻana o nā pūʻulu pūnaewele haʻahaʻa, nāwaliwali, ikaika, a ikaika loa. .I ka wā i hōʻiliʻili ʻia ai nā ʻikepili a pau, ua hoʻohana ʻia ka loiloi hoʻohālikelike ATPD e kōkua i ka loaʻa ʻana o ka ʻike e pili ana i ka ikehu adsorption o ka molekele probe ma ke ʻano he hana o kēlā me kēia wela desorption.ʻO ka hāʻawi ʻana i ka ikehu kumulative ma ka wahi e hōʻike ana i nā waiwai acidity e pili ana i nā waiwai ikehu awelika (i kJ/mol) (e laʻa me ka uhi ʻana o ka ʻili θ = 0.5).
Ma ke ʻano he pane ʻimi noiʻi, ua kau ʻia ka propene i ka dehydration o isopropanol no ka loaʻa ʻana o ka ʻike hou e pili ana i ka hana o nā mea i aʻo ʻia.Ua kūlike nā hopena i loaʻa me nā ana ATPD ma mua e pili ana i ka ikaika a me ka nui o nā pae waika honua, a ua hiki nō ke hoʻokaʻawale i waena o nā pūnaewele waikawa Brønsted a me Lewis.
Kiʻi 1. (Left) Deconvolution o ka moʻolelo ATPD me ka hoʻohana ʻana i kahi hana Gaussian (hōʻike ka laina kiko melemele i ka ʻaoʻao i hana ʻia, ʻo nā kiko ʻeleʻele nā ​​ʻikepili hoʻokolohua) ('ākau) Ammonia desorption energy distribution function ma nā wahi like ʻole.
ʻO Roberto Di Cio Faculty of Engineering, University of Messina, Contrada Dee Dee, SantʻAgata, I-98166 Messina, Italia
Francesco Arena, Roberto Di Cio, Giuseppe Trunfio (2015) "Ka Ho'āʻo Hoʻokolohua o ka Ammonia Temperature-Programmed Desorption Method for Investigating the Acid Properties of Heterogeneous Catalyst Surfaces" Applied Catalysis A: Review 503, 227-236
Hūnā ʻikepili.(Fepeluali 9, 2022).ʻO ka loiloi hoʻokolohua o ke ʻano o ka desorption o ka amonia i hoʻolālā ʻia i ka wela e aʻo ai i nā waiwai waikawa o nā ʻāpana heterogeneous o nā catalysts.AZ.Ua kiʻi ʻia i ka lā 7 Kepakemapa, 2023 mai https://www.azom.com/article.aspx?ArticleID=14016.
Hūnā ʻikepili."Ka Loiloi Ho'āʻo o kahi ʻano hoʻoheheʻe ʻana i ka Ammonia i hoʻolālā ʻia no ke aʻo ʻana i nā ʻano ʻakika o nā ʻili hoʻoheheʻe heterogeneous".AZ.Kepakemapa 7, 2023 .
Hūnā ʻikepili."Ka Loiloi Ho'āʻo o ke ʻano hoʻoheheʻe ʻana i ka Ammonia i hoʻopaʻa ʻia no ka hoʻopaʻa ʻana i nā ʻano ʻakika o nā ʻili o ka Catalyst Heterogeneous".AZ.https://www.azom.com/article.aspx?ArticleID=14016.(Loaʻa: Kepakemapa 7, 2023).
Hūnā ʻikepili.2022. Ka loiloi hoʻokolohua o kahi ʻano hoʻoheheʻe ammonia i hoʻolālā ʻia i ka wela no ke aʻo ʻana i nā waiwai ʻakika o nā ʻāpana catalyst heterogeneous.AZoM, loaʻa iā 7 Kepakemapa 2023, https://www.azom.com/article.aspx?ArticleID=14016.