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 nā 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, e alakaʻi ana 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 i ka QMS e hiki ai iā mākou ke hoʻokaʻawale maʻalahi ma waena o nā ʻano ʻano like ʻole i hoʻopau ʻia mai ka ʻili me ka hoʻohana ʻole ʻana i nā kānana a me nā kānana 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 molekele 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 quantitative i ka 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, 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 ʻaoʻao ATPD me ka hoʻohana ʻana i kahi hana Gaussian (ʻo ka laina kiko melemele ka mea 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 i hoʻolālā ʻia i ka wela o ka amonia e aʻo ai i nā waiwai waikawa o nā ʻili 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 ka hoʻopaʻa 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.
Ka manawa hoʻouna: Sep-07-2023
