One-Pot Hydrothermal Synthesis of Nanostructured LaAPSO-34 Molecular Sieve and Sono-dispersion of Cr over it Used in Conversion of Ethane to Ethylene in the Presence of Carbon Dioxide
Abstract:
Dehydrogenation of ethane to ethylene in the presence of CO2 has been carried out over chromium oxide catalysts sonochemically supported on parent SAPO-34 and nanostructured LaAPSO-34 molecular sieve with the aim of understanding the effects of support nature and La incorporation on the physicochemical properties and performance of catalyst. Like SAPO-34, nanostructured LaAPSO-34 with nominal Si/Al ratio of 0.3 in the gel was successfully synthesized via one-pot hydrothermal method as evidenced by XRD, FESEM, BET, EDX and FTIR techniques. Based on the characterization results, La incorporation into the framework of SAPO-34, not only complete crystallinity of SAPO-34, but increases in the surface area resulted in higher dispersion of Cr species and more uniform surface morphology. This reflects in higher content of redox Cr species stabilized in comparison with parent SAPO-34(0.3), which accounts for superior catalytic performance and stability of Cr/LaAPSO-34 (0.30) nanocatalyst. Moreover, more active sites which have been attributed to the higher amount of OH groups for La-doped SAPO-34 were proved by FTIR analysis. By employing SAPO-34 supports, a reasonable catalytic performance was observed. Doping SAPO-34(0.3) by lanthanum metal endows a most efficient support applicable for the selective oxidative dehydrogenation process. It was found that Cr/LaAPSO-34(0.3) effectively dehydrogenated ethane to ethylene in the presence of CO2 at °700C even after 5 hrs on-stream operation, giving 45% and 93% ethylene yield and selectivity, respectively. Less sensitivity to deactivation during the course of running the reaction evidently indicated the synergism effect of lanthanum existence and ultrasound irradiation on alleviating the catalyst deactivation in ethane dehydrogenation with CO2.
Language:
Persian
Published:
Petroleum Research, Volume:26 Issue: 90, 2017
Pages:
88 to 103
magiran.com/p1671495  
دانلود و مطالعه متن این مقاله با یکی از روشهای زیر امکان پذیر است:
اشتراک شخصی
با عضویت و پرداخت آنلاین حق اشتراک یک‌ساله به مبلغ 990,000ريال می‌توانید 70 عنوان مطلب دانلود کنید!
اشتراک سازمانی
به کتابخانه دانشگاه یا محل کار خود پیشنهاد کنید تا اشتراک سازمانی این پایگاه را برای دسترسی نامحدود همه کاربران به متن مطالب تهیه نمایند!
توجه!
  • حق عضویت دریافتی صرف حمایت از نشریات عضو و نگهداری، تکمیل و توسعه مگیران می‌شود.
  • پرداخت حق اشتراک و دانلود مقالات اجازه بازنشر آن در سایر رسانه‌های چاپی و دیجیتال را به کاربر نمی‌دهد.
دسترسی سراسری کاربران دانشگاه پیام نور!
اعضای هیئت علمی و دانشجویان دانشگاه پیام نور در سراسر کشور، در صورت ثبت نام با ایمیل دانشگاهی، تا پایان فروردین ماه 1403 به مقالات سایت دسترسی خواهند داشت!
In order to view content subscription is required

Personal subscription
Subscribe magiran.com for 50 € euros via PayPal and download 70 articles during a year.
Organization subscription
Please contact us to subscribe your university or library for unlimited access!