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بررسی تاثیر ثابت سرعت واکنش غیرفعال شدن کاتالیست نقره پایه پلیمری در تبدیل آلایندهی 4-نیتروفنول به 4-آمینوفنول | ||
| مدل سازی در مهندسی | ||
| دوره 22، شماره 77، شهریور 1403، صفحه 117-127 اصل مقاله (1.12 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22075/jme.2024.31327.2500 | ||
| نویسندگان | ||
| نوید احدی جمایران1؛ علی نعمت اله زاده* 2؛ بهروز میرزایی2 | ||
| 1دانشجوی دکتری، گروه مهندسی شیمی، دانشکده فنی و مهندسی، دانشگاه محقق اردبیلی، اردبیل | ||
| 2استاد، گروه مهندسی شیمی، دانشکده فنی و مهندسی، دانشگاه محقق اردبیلی، اردبیل | ||
| تاریخ دریافت: 31 تیر 1402، تاریخ بازنگری: 23 آذر 1402، تاریخ پذیرش: 19 دی 1402 | ||
| چکیده | ||
| تبدیل کاتالیستی آلایندهی آلی 4-نیتروفنول به 4-آمینوفنول به‌عنوان یک واکنش مدل در تماس با کاتالیست نقره بر پایه پلیمر در یک بستر پرشده شبیهسازی شد. در این کار، افت فعالیت کاتالیست بر اثر باقیمانده‌های محصول بر روی کاتالیست و همچنین تاثیر ثابت سرعت واکنش غیرفعال شدن کاتالیست و تغییرات میزان تبدیل بررسی شد. سه مقدار مختلف برای ثابت سرعت واکنش غیرفعال شدن به‌صورت ، و انتخاب شدند. نتایج نشان داد با افزایش مقدار ثابت سرعت غیرفعال شدن کاتالیست؛ درصد تبدیل در پایان زمان مورد مطالعه به ترتیب 2، 10 و 70 درصد و فعالیت کاتالیست به ترتیب 25، 75 و 95 درصد کاهش می‌یابد. همچنین فعالیت این کاتالیست در طول بستر کاتالیستی در طی زمان انجام واکنش، به‌علت تجمع محصول در قسمتهای پایین بستر، افت بیشتری نسبت به بالای بستر داشت. لذا انتخاب کاتالیست مناسب با حداقل ثابت سرعت واکنش غیرفعال شدن، برای رسیدن به بیشترین درصد تبدیل و بالاترین مقدار فعالیت کاتالیست، مهم است. | ||
| کلیدواژه‌ها | ||
| بستر پُر شده؛ کاتالیست نقره پایه پلیمری؛ 4-نیتروفنول؛ 4-آمینوفنول؛ فعالیت کاتالیست | ||
| عنوان مقاله [English] | ||
| Investigating the Effect of Deactivation Rate Constant of Polymer-Based Silver Catalyst on the Reduction of Pollutant 4-Nitrophenol to 4-Aminophenol | ||
| نویسندگان [English] | ||
| Navid Ahadi-Jomairan1؛ Ali Nematollahzadeh2؛ Behruz Mirzayi2 | ||
| 1Ph.D. Candidate, Department of chemical engineering, Faculty of Engineering, University of Mohaghegh Ardabili | ||
| 2Professor, Chemical Engineering Department, University of Mohaghegh Ardabili, P.O. Box 179, Ardabil, Iran. | ||
| چکیده [English] | ||
| The catalytic reduction of the organic pollutant, 4-nitrophenol to 4-aminophenol was simulated as a model reaction in contact with the polymer-based silver catalyst in a packed bed. The decrease in the catalyst activity as a result of the product residues on the catalyst and also the effect of the deactivation rate constant and conversion rate changes was investigated. Three different values for the deactivation rate constant were chosen as 4.8´10-5, 2.4´10-4, and 1.2´10-3 m3 mol-1 s-1. The results showed that by increasing the catalyst deactivation rate constant, at the end of the studied time, the conversion decreases by 2, 10, and 70%, respectively, and the catalyst activity decreases by 25, 75, and 95%, respectively. Also, the activity of the catalyst throughout the catalytic bed exhibited a greater drop compared to the upper part of the bed due to the accumulation of the product in the lower part of the bed. Therefore, it is important to choose an appropriate catalyst with the minimum deactivation rate constant to achieve the highest conversion percentage and the highest catalyst activity value. | ||
| کلیدواژه‌ها [English] | ||
| Packed bed, Polymer-based silver catalyst, 4-Nitrophenol, 4-Aminophenol, Catalyst activity | ||
| مراجع | ||
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