بررسی عملکرد کاتالیست زئولیت H-Beta اصلاح شده با نانو ذرات زیرکونیوم در تولید مستقیم گازمایع با استفاده از از کربن‌دی‌اکسید

صدیقی, مهدی

doi:10.22034/farayandno.2024.2025749.1955

بررسی عملکرد کاتالیست زئولیت H-Beta اصلاح شده با نانو ذرات زیرکونیوم در تولید مستقیم گازمایع با استفاده از از کربن‌دی‌اکسید

نوع مقاله : پژوهشی

نویسنده

مهدی صدیقی

دانشیار، گروه مهندسی شیمی، دانشگاه قم، قم، ایران

10.22034/farayandno.2024.2025749.1955

چکیده

کربن دی اکسید یکی از عوامل اصلی تغییرات آب و هوایی و محصول مهم بسیاری از فعالیتهای انسانی، به ویژه تولید صنعتی است. امروزه یکی از اهداف اصلی در زمینه انرژی، تبدیل شیمیایی CO2 به مواد شیمیایی یا سوخت با ارزش است. هدف اصلی این مطالعه بررسی تولید مستقیم گاز مایع از طریق هیدروژناسیون کربندیاکسید با استفاده از کاتالیست زئولیت بتا اصلاح شده با نانوذرات زیرکونیوم است. این مطالعه در راکتور بستر ثابت انجام شد و پارامترهای عملیاتی مانند دمای واکنش و زمان اقامت مورد ارزیابی قرار گرفتند. نتایج نشان داد که شرایط بهینه برای تولید گاز مایع در دمای 380 درجه سانتیگراد و زمان اقامت g.h.mol-112 می باشد. در این شرایط درصد تبدیل CO2 و درصد انتخاب پذیری محصولات هیدروکربنی به ترتیب برابر 29/2 و 39/3 درصد به دست آمد. نتایج درصد توزیع محصولات اتان، گاز مایع و C5+ به ترتیب برابر 10/2، 66/2 و 15/2 درصد به دست آمد. نتایج آزمون FTIR مربوط به جذب پیریدین در Zr/ Zeolite-β نشان داد که سایتهای اسیدی جدید برونستد و لوویس به وجود آمدند و این سایتهای اسیدی نقش مهمی در فرایند تبدیل شیمیایی کربندیاکسید دارند. نتایج پایداری کاتالیست عملکرد مناسبی را تا 100 ساعت بدون غیرفعال شدن نشان داد. در طول این مدت، درصد تبدیل CO2 در حدود 20/5 درصد ثابت باقی ماند. علاوه بر این، انتخاب پذیری برای متان، LPG و C5+به ترتیب مقادیر 10/8، 60/5 و 18/3 درصد میباشد. پس از 100 ساعت، غیرفعال شدن کاتالیست اتفاق میافتد و باعث کاهش تبدیل CO2 به 12/3 درصد و انتخابپذیری LPG به 52/4 درصد میشود.

کلیدواژه‌ها

سنتز LPG

هیدروژناسیون کربن دی اکسید

اسیدیته

غیر فعال شدن

انتخاب پذیری

موضوعات

محیط زیست

عنوان مقاله English

Investigating the Efficacy of H-Beta Zeolite Catalyst Modified by Zirconium Nanoparticles in Direct LPG Synthesis from Carbon Dioxide

نویسنده English

Mehdi Sedighi

Department of Chemical Engineering, University of Qom, Qom, Iran

چکیده English

Carbon dioxide is a critical driver of climate change and a significant byproduct of numerous anthropogenic activities, particularly industrial processes. Contemporary developments in the energy sector underscore the necessity of CO₂ valorization, specifically its transformation into valuable chemicals or fuels. This study focuses on the direct hydrogenation of carbon dioxide for the synthesis of liquefied petroleum gas (LPG). The research utilizes a beta zeolite catalyst augmented with zirconium nanoparticles to investigate the direct hydrogenation of carbon dioxide for liquefied petroleum gas (LPG) synthesis. The experimental protocol employs a fixed bed reactor to evaluate crucial operational variables, including reaction temperature and residence time. The results indicate that optimal conditions for liquid gas production are achieved at a temperature of 380°C with a residence time of 12 g.h.mol⁻¹. Under these specified experimental parameters, the study reports a carbon dioxide conversion rate of 29.2% and a selectivity of 39.3% towards hydrocarbon products. The distribution of hydrocarbon products was further analyzed, revealing that ethane, LPG, and C₂⁺ hydrocarbons comprised 10.2%, 66.2%, and 15.2% of the product stream, respectively. Fourier-transform infrared (FTIR) spectroscopy of pyridine adsorption on the Zr/zeolite-β catalyst identified the formation of new Brønsted and Lewis acid sites, which are essential for facilitating the chemical conversion of carbon dioxide. The catalyst demonstrated remarkable stability, maintaining its activity over an extended period of 100 hours without any detectable deactivation. During the experimental period, the carbon dioxide conversion rate remained consistently stable at approximately 20.5%. Additionally, the catalyst exhibited high selectivity towards the desired products, achieving selectivities of 10.8% for methane, 60.5% for LPG, and 18.3% for C₂+ hydrocarbons. However, after 100 hours of operation, catalyst deactivation was observed, resulting in a decline in CO₂ conversion to 12.3% and a reduction in LPG selectivity to 52.4%.

کلیدواژه‌ها English

LPG Synthesis

Carbon Dioxide Hydrogenation

Acidity

Deactivation

Selectivity

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