سنتز مستقیم گازمایع از کربن‌دی‌اکسید با استفاده از کاتالیست هیبریدی SBA-15 اصلاح شده

نوع مقاله : پژوهشی اصیل

نویسنده

گروه مهندسی شیمی، دانشگاه قم، ایران

چکیده
موضوع تحقیق: تبدیل کربن دی اکسید به هیدروکربن ها یک فرایند بالقوه است که باعث کاهش و کنترل پایدار این گاز گلخانه­ای می­شود. مطابق با اهداف توسعه پایدار از برنامه توسعه سازمان ملل متحد ، گاز مایع سوختی سازگار با محیط زیست تلقی می­شود و به طور گسترده­ای مورد استفاده قرار می­گیرد. هیدروکربن های سبک را می توان مستقیماً از هیدروژناسیون کربن دی اکسید بر روی یک کاتالیست مناسب سنتز کرد.

روش تحقیق: هدف اصلی این مطالعه بررسی سنتز مستقیم گاز مایع از هیدروژناسیون کربن دی اکسید با استفاده از کاتالیست SBA-15 اصلاح شده با نانوذرات مس و روی بود. این مطالعه در راکتور بستر ثابت با استفاده از هیدروژن و کربن دی اکسید به عنوان گاز واکنش دهنده انجام شده است و ارزیابی شرایط عملیاتی نظیر دمای واکنش و زمان اقامت مورد ارزیابی قرار گرفتند.

یافته­های تحقیق: نتایج نشان داد که با اصلاح کاتالیست با سایت های فعال مس و روی، سطح فعال کاتالیست به m2.g-1 542 کاهش می­یابد. همچنین نتایج SEM نشان داد که افزودن اکسیدهای فلزیZnO و CuO منجر به توزیع یکنواخت در کانال­های درونی کاتالیست 1Cu1Zn/SBA-15 شده است و هیچ گونه تجمعی اتفاق نیافتاده است. شرایط بهینه برای تولید LPG در دمای oC 360 و زمان اقامت g.h.mol-1 10 به دست می­آید. در این شرایط درصد تبدیل CO2 و انتخاب پذیری LPG به ترتیب برابر 6/24% و 8/64% به دست آمد. با افزایش دما مقدار LPG افزایش می­یابد و سپس بعد از دمای بهینه افزایش چندانی در مقدار LPG تولیدی مشاهده نمی­شود. با افزایش زمان اقامت بعد از مقدار بهینه، درصد تبدیل CO2 تغییر چندانی نمی­کند و این نشان­دهنده این است که واکنش در محدوده تئوری ترمودینامیکی خود می­رسد. همچنین آزمون عمر کاتالیستی 1Cu1Zn/SBA-15 نشان داد که درصد تبدیل CO2 و انتخاب پذیری LPG تا 85 ساعت تغییری نمی کند. نتایج نشان داد که کاتالیست سنتز شده می تواند در فرایند هیدروژناسیون CO2 به LPG عملکرد مناسبی داشته باشد.

کلیدواژه‌ها

موضوعات


عنوان مقاله English

Direct Synthesis of Liquefied Petroleum Gas from Carbon Dioxide Using Modified SBA-15 Hybrid Catalyst

نویسنده English

mahdi sedighi
Department of Chemical Engineering, University of Qom, Iran
چکیده English

Research Subject: The conversion of carbon dioxide into hydrocarbons is a potential process that can reduce and control greenhouse gases. According to the United Nations Development Program's sustainable development goals, liquefied gas is an environmentally friendly fuel. Hydrogenation of carbon dioxide over a suitable catalyst can be used directly to synthesize light hydrocarbons.

Research Approach: This study investigated the direct synthesis of liquefied petroleum gas from carbon dioxide hydrogenation using SBA-15 catalyst modified with copper and zinc nanoparticles. In this study, hydrogen and carbon dioxide were used as reactant gases, and the operation conditions such as reaction temperature and residence time were evaluated.

Main Results: The results showed that by modifying the catalyst with copper and zinc active sites, the active surface of the catalyst was reduced to 542 m2.g-1. Furthermore, SEM results revealed that the addition of metal oxides ZnO and CuO resulted in uniform distribution in the internal channels of the 1Cu1Zn/SBA-15 catalyst, with no aggregation. LPG production is optimal at a temperature of 360 oC and a residence time of 10 g.h.mol-1. These conditions yielded a CO2 conversion rate of 24.6% and a LPG selectivity of 64.8%, respectively. The amount of LPG produced increases as the temperature rises, and after reaching the optimum temperature, there is no significant increase in the amount of LPG produced. The percentage of CO2 conversion does not change much when the residence time is increased after the optimum value, indicating that the reaction has reached its thermodynamic theoretical range. According to the catalytic lifetime test of 1Cu1Zn/SBA-15, CO2 conversion percentage and LPG selectivity do not change after 85 hours. Based on the results of the experiments, the synthesized catalyst can hydrogenate CO2 efficiently to LPG.

کلیدواژه‌ها English

CO2
Hydrogenation
LPG
Residence Time
Deactivation
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