ساخت و کاربردکاتالیست‌های امولسیونی پلی اگزوتنگستنی وانادیمی دووسونی برای گوگردزدایی اکسایشی

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی شیمی، نفت و گاز، دانشگاه علم و صنعت، تهران، ایران

چکیده

آلودگی‌های زیست محیطی ناشی از سوخت‌های فسیلی باعث گردید که وضع قوانین سختگیرانه را برای حذف ترکیبات گوگردی و دستیابی به روش‌های نوین برای برآورده ساختن این قوانین مدنظر قرار گیرد. در همین راستا برای اولین بار، کاتالیست‌های امولسیونی پلی اگزوتنگستنی وانادیمی دووسونی [TBA]6+xP2W18-xVxO62 ( X= 0، 1، 3 و 5) برای گوگرد زدایی اکسایشی ترکیبات گوگردی با موفقیت سنتز و با استفاده از روش آنالیز عنصری، FTIR، 31P MAS NMR و UV-vis DRS ساختارشناسی شد. این کاتالیست‌ها برای اکسایش ترکیبات گوگردی، بنزوتیوفن و دی بنزوتیوفن با استفاده از هیدروژن پراکسید تحت شرایط متعادل (دمای کمتر از 100 oC و فشار اتمسفریک) مورد استفاده قرار گرفت. فعالیت کاتالیست با افزایش مقدار وانادیم در ساختار هتروپلی آنیون افزایش یافت. واکنش پذیری اکسایشی ترکیب گوگرد دی بنزوتیوفن بیشتر از بنزوتیوفن بوده است. کاتالیست امولسیونی با بالاترین مقدار وانادیم، [TBA]11P2W13V5O62، قادر است 85 % دی بنزوتیوفن و 50 % بنزوتیوفن را در مدت 75 دقیقه و دمای 60 oC با استفاده از هیدروژن پراکسید 30 % حجمی با نسبت مولی اکسیژن به گوگرد 4 اکسید نماید.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Synthesis and Application of Dawson-Type Vanadium Polyoxotungstate Emulsion Catalyst for Oxidative Desulfurization

نویسندگان [English]

  • Farhad Banisharif
  • Mohammad Reza Dehghani
Chemical Engineering Department, Iran University of Science and Technology, Tehran, Iran
چکیده [English]

Environmental pollutions originated from fossil fuel cause to consider the development of rigorous rules to remove sulfur containing compounds and achievement of novel process to follow the mentioned of rigorous rules. In this regard and for the first time, new Dawson-type vanadium polyoxotungstate emulsion catalysts, [TBA]6+xP2W18-xVxO62 (x= 0, 1, 3, 5) have been synthesized successfully for oxidative desulfurization of sulfur compounds and characterized by using element analysis, FTIR, 31P MAS NMR and UV-vis DRS. These catalysts were used to oxidize sulfur-containing components, dibenzothiophene and benzothiophene by using hydrogen peroxide under mild conditions ( temperature lower than 100 oC and atmospheric pressure). The activity of catalysts has been grow by increase in number of vanadium in the structure of heteropoly anion. The reactivity of sulfur compound, dibenzothiophene was much more than benzothiophene. The emulsion catalyst with the highest number of vanadium, [TBA]11P2W13V5O62, could oxidize 85 % of dibenzothiophene and 50 % benzothiophene after 75 minutes, under temperature 60 oC and by using hydrogen peroxide 30 v-% in oxygen to sulfur mole ratio 4.

کلیدواژه‌ها [English]

  • Catalytic-Oxidative Desulfurization
  • Dawson-type Polyoxometalate
  • Emulsion Catalyst
  • Vanadium
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