کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
41549 45892 2010 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Dehydrogenation of propane over Pt/KL catalyst: Investigating the role of L-zeolite structure on catalyst performance using isotope labeling
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Dehydrogenation of propane over Pt/KL catalyst: Investigating the role of L-zeolite structure on catalyst performance using isotope labeling
چکیده انگلیسی

Dehydrogenation of propane using an equimolar mixture of propane-d0 and propane-d8 was investigated over 1%Pt/KL and 1%Pt/SiO2 at atmospheric pressure and different reaction temperatures. A normal kinetic isotope effect exists (kH/kD = 1.4–1.5) when the reaction is conducted on Pt/KL at different temperatures (400, 500, and 600 °C), suggesting that C–H bond activation is involved in the kinetically relevant steps. Furtheremore, there is hardly any H–D exchange in the recovered propane during dehydrogenation at temperatures above 400 °C, suggesting that adsorption and subsequent dehydrogenation of propane are essentially irreversible and that C–H bond activation is the rate determining step. Unlike the case of hexane aromatization, the unique structure of L-zeolite does not help in controlling the entry of propane molecules into the lobes of the L-zeolite containing the active sites; hence, bimolecular reactions do occur, leading to coke formation and catalyst deactivation.

Figure optionsDownload high-quality image (88 K)Download as PowerPoint slideResearch highlights▶ An NKIE exists during propane (H and D labeled) dehydrogenation over Pt/KL. ▶ Catalyst deactivation occurred from carbon deposition due to bimolecular reactions. ▶ The unique structure of Pt/KL did not enhance performance with C3 as with C6.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Catalysis A: General - Volume 390, Issues 1–2, 20 December 2010, Pages 264–270
نویسندگان
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