مهندسی شیمی ایران

مهندسی شیمی ایران

بررسی رابطۀ ساختار- عملکرد کاتالیست NiO-La2O3/DMSN در فرایند متان‌سازی CO2

نوع مقاله : مقاله پژوهشی

نویسندگان
1 دانشجوی دکتری مهندسی شیمی، دانشگاه رازی
2 استادیار شیمی فیزیک، دانشگاه صنعت نفت
3 استاد مهندسی شیمی، دانشگاه رازی
چکیده
کاتالیست جدید و بسیار فعال NiO-La2O3/DMSN بااستفادهاز دو روش تشکیل کمپلکس با سیترات (C) و تلقیح تر (I) آماده و عملکرد آن‌ در فرایند متان‌سازی کربن‌دی‌اکسید، مقایسه و بررسی شد. آنالیزهای XRD،N2 adsorption -desorption ، FESEM، EDX و Elemental-mapping برای بررسی خواص فیزیکی- شیمیایی ترکیبات سنتزشده بهکار گرفته شد. نتایج آنالیز XRD نشان داد که اندازۀ بلورهای به‌دستآمده با روش (C) کمتر از نصف اندازۀ به‌دستآمده در روش (I) است. همچنین، عملکرد کاتالیستNiO-La2O3/DMSN(C) در محدودۀ دمایی مورد بررسی به‌طور چشم‌گیری بهتر از کاتالیست                        NiO-La2O3/DMSN(I) بود و در دمای C° 400 به حداکثر میزان تبدیل CO2 با مقدار 6/78% و گزینش‌پذیری 35/96% رسید. روش (C) با تقویت برهم‌کنش بین +3La و +2Ni، سبب ایجاد پراکندگی بالای نانوذرات با اندازۀ بسیار کوچک عمدتاً در درون حفره‌های پایه می‌شود و درنتیجه بهبود تبدیل CO2 و گزینش‌پذیری CH4 می‌شود. به‌علاوه، بارگذاری NiO-La2O3 برروی DMSN با روش (C) نسبتبه پایه‌های بهکار رفته در سایر مقالات (نظیر MCF و CeO2) در شرایط مشابه عملیاتی، سبب عملکرد بالاتر شدهاست. این نتایج حاکی از اثر قابل‌توجه ساختار منحصربهفرد DMSN و نیز روش سنتز بر روی بهبود عملکرد کاتالیست است.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Revealing the Structure-Activity Dependency of NiO-La2O3/DMSN for CO2 Methanation

نویسندگان English

A. Shokrollahi 1
T. Hamoule 2
Sh. Sharifnia 3
1 Ph. D. Student of Chemical Engineering, Razi University
2 Assistant Professor of Physical Chemistry, Petroleum University of Technology
3 Professor of Chemical engineering, Razi University
چکیده English

A novel and highly efficient NiO-La2O3/DMSN catalyst was synthesized through two distinct methods including citrate complex (C) and wet impregnation (I) techniques. The catalytic activity of both methods was evaluated for the carbon dioxide methanation process.
The physicochemical properties of the synthesized compounds were analyzed in detail by XRD, N2 adsorption-desorption, FESEM, EDX, and Elemental-mapping analyses. XRD analysis revealed that method (C) produced crystal oxides with a size less than half of that produced by method (I). The performance of the NiO-La2O3/DMSN(C) was markedly superior to that of NiO-La2O3/DMSN(I) across the entire investigated temperature range. Notably, maximum catalytic performance of NiO-La2O3/DMSN(C) was achieved with a CO2 conversion of 78.6% and CH4 selectivity of 96.35% at 400 °C. Method (C) led to the formation of highly dispersed nanoparticles with smaller crystalline size, predominantly in the support pores, by strengthening the interaction between La3+ and Ni2+. This considerably improved CO2 conversion and CH4 selectivity of the catalyst. Moreover, the loading of NiO-La2O3 on DMSN by method (C) resulted in an outstanding performance in comparison to the supports utilized in other studies (like MCF and CeO2) in similar operational conditions. These outcomes highlight the unique structural advantages of DMSN and substantial impact of the synthesis method on the catalyst structure and the subsequent performance.

کلیدواژه‌ها English

Perovskite
Citrate complex method
CO2 methanation
Dendritic mesoporous nano silica
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