سنتز زئولیت Y با استفاده از خاکستر سبوس برنج به عنوان منبع سیلیکا به روشهای هیدروترمال و هیدروترمال به کمک اولتراسوند و به کارگیری آن در کراکینگ هیدروکربن‌های مایع

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه تربیت مدرس

2 دانشگاه تربیت مدرس دانشکده شیمی

چکیده

در این پژوهش زئولیت Y از منبع سیلیکای استخراج شده از سبوس برنج، سنتز شده است. از روش هیدروترمال و هیدروترمال به کمک امواج اولتراسوند استفاده شده است. تاثیر امواج اولتراسوند بر روی خواص فیزیکی- شیمیایی زئولیت سنتزی مورد بررسی قرار گرفته است. سنتز این نوع زئولیت به دو روش هیدروترمال و هیدروترمال به کمک اولتراسوند انجام شد. مشخصات زئولیت‌های سنتز شده با استفاده از تکنیک‌های XRD، FESEM‌، FTIR، BET تعیین شد و عملکرد نمونه‌های سنتزی در فرآیند شکست کاتالیستی هیدروکربن-های مایع در راکتور بستر ثابت مورد ارزیابی قرار گرفت‌. خواص محصولات گازی و مایع با استفاده از آنالیزهای GC و SIMDIS مورد بررسی قرار گرفت. همچنین چگالی، شاخص انکسار و گرانروی محصولات مایع اندازه‌گیری شد. نتایج آزمایش‌های راکتوری نشان داد که زئولیت سنتز شده به روش هیدروترمال به کمک اولتراسوند به دلیل تاثیر این امواج بر بلورینگی زئولیت و شیاردار کردن سطح ذرات، از عملکرد بهتری برخوردار بوده است. با توجه به آنالیز XRD، بلورینگی زئولیت سنتز شده به روش هیدروترمال با کمک اولتراسوند 21‌% بیشتر از میزان بلورینگی زئولیت سنتز شده به روش هیدروترمال بود. با استفاده از آنالیز FTIR پس از انجام آزمایش راکتوری نشان داده شد که ساختار زئولیت Y پس از انجام واکنش حفظ شده است.

کلیدواژه‌ها

عنوان مقاله [English]

Zeolite Y synthesis from rice husk ash as Si source using hydrothermal and hydrothermal assisted ultrasound methods used in catalytic cracking of liquid hydrocarbons

نویسندگان [English]

  • Mahsa Askari 1
  • Erfan Aghaei 1
  • Ramin Karimzadeh 2
1 Tarbiat Modares University
2 Tarbiat Modares University
چکیده [English]

In this research, zeolite Y was synthesized using extracted silica from rice husk ash as a silica source. Hydrothermal and hydrothermal assisted ultrasound methods were used for zeolite synthesis. Effect of ultrasound on physico-chemical properties of the synthesized sample has been investigated. The properties of the synthesized zeolites were determined using XRD, FESEM‌, FTIR and BET analysis and their performance were investigated in the catalytic cracking of liquid hydrocarbons in a fixed bed reactor. The gaseous and liquid products properties were determined using GC and SIMDIS analysis‌. Also density, viscosity and refractive index of the liquid products were ascertained. The results showed that the synthesized zeolite by ultrasound pretreatment prior hydrothermal method had approximately better catalytic performance because of the effect of ultrasound irradiations on the zeolite crystallinity and particles surface grooving. According to XRD results, the crystallinity of the synthesized zeolite by ultrasound pretreatment prior hydrothermal method was 21% greater than prepared sample using conventional hydrothermal method. By using the FTIR analysis after reaction test, it was shown that the structure of zeolite Y remained after reaction.
 
 
 
 

کلیدواژه‌ها [English]

  • Keywords: Zeolite Y
  • Rice Husk Ash
  • Ultrasound Irradiation
  • Catalytic Cracking

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  • تاریخ دریافت: 22 دی 1397
  • تاریخ بازنگری: 02 اردیبهشت 1398
  • تاریخ پذیرش: 13 خرداد 1398

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