METANNING BUG‘LI RIFORMINGI UCHUN PEROVSKIT PREKURSORLARIDAN AJRALIB CHIQQAN EKSSOLVATSIYALANGAN NI-CO BIMETALL NANOKATALIZATORLARI: KOKSLANISH VA SINTERLANISHGA YUQORI CHIDAMLILIK MEXANIZMLARI
DOI:
https://doi.org/10.66960/jof.3093-8899.00025Kalit so‘zlar:
In situ ekssolvatsiya, Ni-Co bimetall katalizatori, Nuqsonli perovskit oksidi, Kokslanishga chidamlilik, Vodorod ishlab chiqarishAbstrakt
An'anaviy nikel asosidagi katalizatorlarning termik sinterlanish va uglerod cho‘kishi ya’ni kokslanish orqali faolligini yo‘qotishi metanning bug‘li riformingi jarayonidagi asosiy muammo bo‘lib qolmoqda. Buni hal qilish uchun biz nuqsonli perovskit oksidi tashuvchisiga o‘rnatilgan, yuqori faollikka ega va favqulodda chidamli, ajralib chiqqan bimetall katalizatorning oqilona dizaynini taqdim etamiz. In situ ekssolvatsiya strategiyasi orqali yaxshi tarqalgan Ni-Co qotishma nanopartikullari dastlabki perovskit matritsasiga mahkam biriktirildi va kuchli o‘zaro ta‘sirga ega bo'lgan "uya" mikrostrukturasini hosil qildi. Metanning bug‘li riformingi katalizatori atmosfera bosimi ostida 850 °C haroratda metanning maksimal 92.5% konversiyasiga erishib, Metanning bug‘li riforming jarayonida ustun samaradorlikni namoyish etdi. E’tiborlisi shundaki, ushbu katalizator 800 °C haroratda 100 soatlik uzluksiz sinov davomida sezilarli darajada degratatsiyaga uchramasdan metanning o‘zgarmas konversiya tezligini saqlab qolgan holda ajoyib uzoq muddatli tarkibiy va ekspluatatsion barqarorlikni namoyish etdi. Reaksiyadan keyingi tahlillar va mexanistik baholashlar shuni ko‘rsatadiki, kokslanishga bo‘lgan ajoyib chidamlilik va termik barqarorlik asosan faol markazlarning tarkibiy mustahkamlanishi va Ni-Co bimetall tizimidagi kuchli sinergik effekt bilan bog‘liq. “Ishlab chiqilgan NiCo@STNC tizimi an’anaviy tashuvchili Ni katalizatorlarida tez-tez uchraydigan tez dezaktivatsiya qilinish muammosini hal qilib, sezilarli darajada yuqori barqarorlik va uglerod cho‘kishiga qarshilikni namoyish etadi”. Ushbu ishdagi yangilik bug‘ga boy metanning bug‘li riforming sharoitlarida ajralib chiqqan Ni-Co nanopartikullarining kokslanishga qarshi mexanizmini yoritib berishdan iborat. Bundan tashqari, nuqsonli perovskit tashuvchisi tomonidan ta’minlangan panjara kislorodining yuqori harakatchanligi uglerodli oraliq mahsulotlarning tezroq gazlanishiga hamkorlikda yordam beradi. Ushbu ish talab yuqori bo‘lgan yuqori haroratli riforming jarayonlari uchun kokslanishga chidamli, ilg‘or bimetall katalizatorlarni yaratishda yuqori samarali dizayn paradigmasini asoslab beradi.
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