کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
38859 45794 2016 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Low-temperature synthesis of rhodium phosphide on alumina and investigation of its catalytic activity toward the hydrodesulfurization of thiophene
ترجمه فارسی عنوان
سنتز دمای پایین فسفید رودیوم روی آلومینا و بررسی فعالیت کاتالیزوری آن در برابر هیدروژن سولفوریزاسیون تیوفن
کلمات کلیدی
کاتالیزور فسفید رودی، پشتیبانی آلومینا، هیدرود سولفوریزاسیون، ترفنیل فسفین، سنتز کم دما
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
چکیده انگلیسی


• The formation temperature of Rh2P can be remarkably decreased through the use of triphenylphosphine as a P source.
• After reduction at lower temperatures (below 450 °C), excess P covered the surface of Rh2P.
• The P(T)/Rh/Al2O3 catalyst exhibited higher hydrodesulfurization activity than the Rh-P(A)/Al2O3 catalyst.
• Small Rh2P particle can be prepared from triphenylphosphine.

In this study, the low-temperature synthesis of rhodium phosphide (Rh2P) on alumina (Al2O3) using triphenylphosphine (TPP) as a phosphorus (P) source and its catalytic activity toward hydrodesulfurization (HDS) were investigated to prepare a highly active HDS catalyst. TPP was more easily reduced than phosphate, and Rh2P was formed in the P(T)/Rh/Al2O3 catalyst prepared from TTP at lower temperature as compared with the temperature required by Rh-P(A)/Al2O3 catalyst prepared from a phosphate precursor. However, after reduction at a low temperature (450 °C), excess P covered the surface of Rh2P. The optimal reduction temperature for HDS rate of the P(T)/Rh/Al2O3 catalyst (650 °C) was lower than that of the Rh-P(A)/Al2O3 catalyst (800 °C). Furthermore, this temperature was slightly higher than the optimal reduction temperature for CO uptake (600 °C). These results are explained as follows: HDS rate is increased by both elimination of excess P on the active sites at higher reduction temperatures and enhancement of the crystallinity of Rh2P. Furthermore, because the particle size of the P(T)/Rh/Al2O3 catalyst (ca. 1.2 nm) was substantially smaller than that of the Rh-P(A)/Al2O3 catalyst, the P(T)/Rh/Al2O3 catalyst exhibited greater HDS rate compared with the Rh-P(A)/Al2O3 catalyst.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Catalysis A: General - Volume 515, 10 April 2016, Pages 25–31
نویسندگان
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