کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
43001 45950 2008 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Preparation and catalysis of amorphous CoNiB and polymer-stabilized CoNiB catalysts for hydrogenation of unsaturated aldehydes
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Preparation and catalysis of amorphous CoNiB and polymer-stabilized CoNiB catalysts for hydrogenation of unsaturated aldehydes
چکیده انگلیسی

CoNiB and polymer polyvinylpyrrolidone (PVP)-stabilized CoNiB (PVP-CoNiB) catalysts were prepared by chemical reduction with NaBH4. They were characterized and examined for their catalysis in the hydrogenation of unsaturated aldehydes. CoNiB and PVP-CoNiB catalysts were characterized by X-ray diffraction as amorphous structures and by transmission electron microscopy as having particle sizes in the range 3.5–7 nm – smaller than those of NiB (7–15 nm) and CoB (5–10 nm). CoNiB catalysts were significantly more active than NiB and CoB in the hydrogenations of furfural, crotonaldehyde and citral, and the PVP-CoNiB catalysts were significantly more active than CoNiB. The catalytic properties of CoNiB and PVP-CoNiB catalysts during the selective hydrogenations of crotonaldehyde and citral were similar to those of NiB, but different from those of CoB. The conjugated CC bonds in crotonaldehyde and citral were preferentially reduced to form butyraldehyde and citronellal. PVP-CoNiB could hydrogenate citral to citronellal at a low reaction temperature of 30 °C.

The CoNiB and PVP-stabilized CoNiB catalysts were prepared by chemical reduction with NaBH4. They were significantly more active than NiB and CoB in the hydrogenation of furfural, crotonaldehyde and citral. The most active catalyst PVP(2)-CoNiB(0.5) could selectively hydrogenate citral to citronellal at a low reaction temperature of 30 °C, with a good citronellal selectivity of about 86%. Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Catalysis A: General - Volume 346, Issues 1–2, 31 August 2008, Pages 179–188
نویسندگان
, , , ,