کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
687059 1460108 2013 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Control of microwave-generated hot spots. Part IV. Control of hot spots on a heterogeneous microwave-absorber catalyst surface by a hybrid internal/external heating method
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تکنولوژی و شیمی فرآیندی
پیش نمایش صفحه اول مقاله
Control of microwave-generated hot spots. Part IV. Control of hot spots on a heterogeneous microwave-absorber catalyst surface by a hybrid internal/external heating method
چکیده انگلیسی

A problem with microwave-absorbing heterogeneous catalysts (MAHCs) in non-polar solvents is resolved with a novel approach that also uses an external heating bath in combination with microwave heating. In non-polar solvents, the microwave radiation dielectrically and selectively heats only the catalyst resulting in the frequent occurrence of hot spots under these conditions. However, such hot spots can be controlled through a combined (hybrid) internal/external heating methodology (MAHS). Moreover, high temperatures can be maintained with significant energy saving. The potential benefit of MAHS has been examined by carrying out the synthesis of 4-methylbiphenyl using the Suzuki–Miyaura coupling reaction in toluene solvent in the presence of palladium catalytic particles supported on activated carbon particulates (Pd/AC). The hybrid internal/external heating method saved 65% of microwave energy and increased the chemical yield of 4-methylbiphenyl nearly twofold in comparison with a conventional microwave heating method.

Figure optionsDownload as PowerPoint slideHighlights
► A microwave-driven heterogeneous catalyzed reaction in a non-polar solvent was enhanced using a novel microwave hybrid method.
► Performance of microwave absorbers (MWA) was investigated through heating efficiency and energy saving.
► Microwave hot-spots on the catalyst surface were controlled under internal and external heating conditions.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering and Processing: Process Intensification - Volume 69, July 2013, Pages 52–56
نویسندگان
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