نشریه علمی فرآیند نو

نشریه علمی فرآیند نو

مروری بر کاربردهای کاتالیستی زئولیت‌ها برای تبدیل کربن‌دی‌اکسید

نوع مقاله : مروری

نویسندگان
1 دانشجوی دکتری مهندسی شیمی، دانشگاه علم و صنعت ایران
2 استاد مهندسی شیمی، دانشگاه علم و صنعت ایران
چکیده
زئولیت‌ها به‌عنوان کاتالیزورهای اسیدی نقش کلیدی در انتخاب‌پذیری، بهره‌وری و پایداری واکنش‌های تبدیل کربن‌دی‌اکسید (CO₂) ایفا می‌کنند. این مطالعه عملکرد زئولیت‌های مختلف را در تبدیل CO₂ به دی‌متیل‌اتر  (DME)، الفین‌های سبک، هیدروکربن‌ها و ترکیبات آروماتیک بررسی کرده است. نتایج نشان داد که زئولیت ZSM-5  به دلیل ساختار متخلخل متوسط و اسیدیته قوی، انتخاب‌پذیری بیش از %80 برای تولید ترکیبات آروماتیک را نشان می‌دهد​. همچنین، زئولیت‌های موردنیت (H-MOR) به دلیل پایداری حرارتی بالا و توانایی حمل سایت‌های اکسید فلزی، در سنتز هیبریدی فعال برای تولیدDME  با انتخاب‌پذیری %74 عملکرد مطلوبی نشان داده‌اند. از سوی دیگر، اصلاح زئولیت‌ها از طریق افزودن فلزات واسطه مانند Ga، Zn، Fe وCu  موجب بهبود تبدیل CO₂ به آروماتیک‌ها شده است، به‌گونه‌ای که در حضور زئولیت ZSM-5 اصلاح‌شده با Fe₂O₃/KO₂، انتخاب‌پذیری آروماتیک‌ها تا %74/3 افزایش یافته است. همچنین، ترکیب SAPO-34 با فلز پالادیم در فشار 50 بار و دمای°C 350‌ نرخ تبدیل  %40 CO₂ به پروپان را فراهم کرده است. این یافته‌ها نشان می‌دهد که تنظیم نسبت Si/Al، نوع فلز افزوده‌شده و روش سنتز زئولیت تأثیر مستقیمی بر انتخاب‌پذیری و پایداری کاتالیست‌ها دارد و زئولیت‌ها به‌عنوان بسترهای کاتالیستی پیشرفته، می‌توانند نقش مهمی در کاهش انتشار گازهای گلخانه‌ای و تولید ترکیبات با ارزش در صنایع شیمیایی و انرژی داشته باشند.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Catalytic Applications of Zeolites for Carbon Dioxide Conversion: A Review

نویسندگان English

Fatemeh Bahmanzadegan 1
Ahad Ghaemi 2
1 Ph.D. Student, School of Chemical Engineering, Iran University of Science and Technology
2 Professor, School of Chemical Engineering, Iran University of Science and Technology
چکیده English

Zeolites, as acidic catalysts, play a pivotal role in enhancing the selectivity, efficiency, and stability of carbon dioxide (CO₂) conversion reactions. This study evaluates the performance of various zeolites in transforming CO₂ into dimethyl ether (DME), light olefins, hydrocarbons, and aromatic compounds. Results demonstrate that ZSM-5 zeolites, with their medium pore structure and strong acidity, achieve over 80% selectivity for aromatic production. H-MOR zeolites exhibit high thermal stability and hybrid catalytic activity, enabling 74% selectivity for DME synthesis. Modification of zeolites with transition metals (e.g., Fe, Zn, Ga, Cu) significantly improves CO₂ conversion to aromatics; Fe₂O₃/KO₂-modified ZSM-5 enhances aromatic selectivity to 74.3%. Additionally, SAPO-34 combined with palladium under high-pressure conditions (50 bar, 350°C) achieves 40% CO₂ conversion to propane. Key factors influencing catalytic performance include the Si/Al ratio, metal doping strategies, and synthesis methods. These findings underscore the potential of zeolites as tunable catalysts for reducing greenhouse gas emissions and producing value-added chemicals in energy and chemical industries.

کلیدواژه‌ها English

Zeolite
Catalyst
Conversion
Carbon dioxide
Aromatics
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