بررسی آزمایشگاهی اثر خواص شیمی سطح گرافن بر فرآیند تشکیل هیدرات متان و میزان ذخیره‌سازی و پایداری آن

نوع مقاله : مقاله ترویجی

نویسنده

عضو هیئت علمی پژوهشگاه صنعت نفت، پژوهشگاه صنعت نفت، تهران، ایران، کدپستی ۱۳۷-۱۴۶۶۵

چکیده

در این تحقیق فرآیند تشکیل هیدرات متان در حضور گرافن و گرافن اکسید بررسی شد. بطوریکه ابتدا نانو صفحات گرافنی توسط فرآیند CVD بر روی بستر مس رشد داده و سنتز شد و با آنالیزهای XRD، FTIR و AFM ساختار آن مورد مطالعه قرار گرفت. سپس نانوسیالات پایدار حاوی گرافن و گرافن اکسید شده با غلظت ۱٪ وزنی تهیه شده و در فرآیند تشکیل هیدرات گازی در ۱۰۰psig و دمای  C° ۴استفاده شد. به‌طوری‌که نانو سیال حاوی گرافن/سورفکتنت ضمن کاهش زمان القا و انحلال به ترتیب تا ۴۶/۰٪ و ۶۰/۹٪ نسبت به نمونه آب خالص، توانسته میزان ذخیره‌سازی را تا ۵۷/۶٪ افزایش دهد. این امر به دلیل افزایش ۴۰ برابری انحلال اولیه متان در نانو سیال نسبت به آب بوده که این امر حاصل از کاهش مقاومت انتقال جرم در اثر حضور سورفکتنت و همچنین وجود سایت‌های فعال ناهمگن بیشتر جهت هسته‌زایی است. همچنین مشاهده شد علی‌رغم اینکه پایداری هیدرات‌های تشکیل شده در حضور گرافن کمتر از گرافن اکسید است، اما بعد از رسیدن به پایداری، میزان متان ذخیره شده در هیدرات گرافن از این مقدار برای نمونه شاهد ۳۴/۹ حجم بیشتر است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Experimental Study on Affect of Graphene Surface Chemistry on the Process of Methane Hydrate Formation and its Storage and Stability

نویسنده [English]

  • Ahmad Ghozatloo

Faculty member of Research Institute of Petroleum Industry (RIPI), Tehran, Iran

چکیده [English]

In this research, the process of formation of methane hydrates was investigated in the presence of graphene and graphene oxide. First, the graphene nano sheets synthesized and growth on the copper substrate by the CVD method and It was structure was evaluated by XRD, FTIR and AFM analysis. Then, 1% wt. of stable graphene and graphene oxidized nanofluids were prepared and used in the process of gas hydrates formation at 1000 psig and at 4 °C. As the nanofluid containing graphene / surfactant, while reducing the Induction and dissolution time to 46.0% and 60.9% respectively, compared to the pure water, could increase the storage rate to 56.7%. This is due to an increase of 40 times the initial dissolution of methane in the nanofluid than water, which is due to the reduction of the mass transfer resistance due to the presence of surfactant and the presence of heterogeneous active sites for nucleation. It was observed, however, the stability of hydrates in presence of graphene is less than graphene oxide, but after reaching the stability, the amount of methane deposited in graphene hydrate is greater than control sample of 34.9.

کلیدواژه‌ها [English]

  • Methane Hydrates
  • Graphene
  • surface properties
  • Oxidation
  • induction
  • stability
  • Storage
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  • تاریخ دریافت: 04 اردیبهشت 1401
  • تاریخ پذیرش: 04 اردیبهشت 1401
  • تاریخ اولین انتشار: 04 اردیبهشت 1401