بهینه‌سازی ساختار گرانول‌های کروی گاما آلومینای تهیه‌شده از روش قطره‌ریزی در روغن

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد مهندسی شیمی، دانشگاه سیستان و بلوچستان

2 استادیار مهندسی شیمی، دانشگاه سیستان و بلوچستان

3 دانشجوی دکتری مهندسی شیمی، دانشگاه سیستان و بلوچستان

چکیده

ساختار گرانول­ها تحت تأثیر روش تهیه و متغیرهای شکل­دهی قرار دارد. در این مقاله، گرانول­های کروی گاما آلومینا از روش قطره­ریزی در روغن ساخته شد. به­منظور بررسی اثر دمای آهکینگی، درصد افزودن پلی‌ونیل الکل و ارتفاع ستون روغن بر مشخصات ساختاری گرانول­ها (مساحت سطح ویژه، قطر و حجم حفره)، از ماتریس­ اورتوگونال در طراحی آزمایش تاگوچی استفاده شد. آنالیز XRD نشان داد که فاز گاما آلومینا در گرانول­ ها تشکیل شد. نمودار هم­دمای جذب و واجذب نیتروژن، ایزوترم نوع چهار را در طبقه­بندی آیوپاک و تشکیل ساختارهای مزوحفره­های استوانه­ای نشان داد. بر اساس تحلیل واریانس، ارتفاع ستون روغن بیشترین اثر معنادار را بر مساحت سطح ویژه (معادل 7/61%) و بر حجم حفره­های گرانول­ها (معادل 4/82%)، و درصد مادۀ افزودنی بیشترین­ اثر معنادار را بر قطر حفره­های گرانول­ها (معادل 8/92%) داشته است. در گرانول­های فاقد پلی‌ونیل الکل تهیه‌شده در ستون روغن با ارتفاع cm 45 و دمای آهکینگی °C500، پاسخ­ها بیشینه شد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Optimizing the Structure of Spherical γ-Alumina Granules Prepared by Oil Drop Method

نویسندگان [English]

  • S. Samak 1
  • H. Zohdi-Fasaei 2
  • M. Zakeri 2
  • F. Pordeli 1
  • M. Ghofran Pakdel 3
1 M. Sc. Student of Chemical Engineering, University of Sistan and Baluchestan
2 Assistant Professor of Chemical Engineering, University of Sistan and Baluchestan
3 Ph. D. Student of Chemical Engineering, University of Sistan and Baluchestan
چکیده [English]

Synthesis method and forming parameters influence the structural properties of granules. In this paper, oil drop was used to synthesize spherical γ-alumina granules. Orthogonal matrix was applied in the Taguchi experimental design to investigate the effect of calcination temperature, additive percentage (PVA %), and column length of oil drop on the granule structures; including specific surface area, pore diameter, and pore volume. XRD analysis confirmed the formation of γ-alumina phase in the synthesized granules. According to the ANOVA, column length had the most significant effect on the specific surface area (61.7%), and on the pore volume of granules (82.4%). Additive percentage had the most significant effect on the pore diameter of γ-alumina granules (92.8%). Maximum responses were achieved by tuning the additive percentage, column length, and calcination temperature at 0%, 45 cm, and 500 °C, respectively.
 

کلیدواژه‌ها [English]

  • Granule structures
  • PVA
  • Oil Drop
  • Spherical Alumina
  • Taguchi Method
  • Optimization

 

 

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