کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9610193 | 47163 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Acylation of phenol on solid acids: Study of the deactivation mechanism
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
کاتالیزور
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Acylation of phenol on solid acids: Study of the deactivation mechanism Acylation of phenol on solid acids: Study of the deactivation mechanism](/preview/png/9610193.png)
چکیده انگلیسی
The deactivation mechanism of the gas-phase synthesis of o-hydroxyacetophenone (o-HAP) via acylation of phenol with acetic acid was studied on Al-MCM-41 and zeolites HY, HBeta and HZSM-5. The o-HAP yield remained constant with time-on-stream on HZSM-5 but drastically decreased on the other samples because of coke formation. The origin and nature of coke precursor species were studied by employing as reactants, the key reaction intermediates and products involved in the phenol acylation reaction network. It was found that coke precursors are formed from consecutive condensation reactions and not from any ketene formation by phenyl acetate decomposition. Specifically, it is proposed that o-acetoxyacetophenone (o-AXAP), which is formed by reaction between o-HAP and acetic acid, is the key intermediate specie responsible for the formation of carbonaceous deposits and consequently, for the activity decay observed on Al-MCM-41, HY and HBeta samples. The narrow pore size structure of zeolite HZSM-5 would hinder the formation of bulky o-AXAP, thereby, decreasing drastically the formation of coke.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Catalysis Today - Volumes 107â108, 30 October 2005, Pages 258-265
Journal: Catalysis Today - Volumes 107â108, 30 October 2005, Pages 258-265
نویسندگان
C.L. Padró, C.R. ApesteguÃa,