کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
43437 | 45969 | 2007 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Direct and efficient transformation of gaseous alkanes into carboxylic acids catalyzed by vanadium containing heteropolyacids Direct and efficient transformation of gaseous alkanes into carboxylic acids catalyzed by vanadium containing heteropolyacids](/preview/png/43437.png)
The vanadium containing heteropolyacids H4[PMo11VO40] × 34H2O (HPA-1), H5[PMo10V2O40] × 32H2O (HPA-2) and H6[PMo9V3O40] × 34H2O (HPA-3) act as highly active catalysts for the direct transformation of light C1–C3 alkanes into the corresponding carboxylic acids in the presence of CO and in the K2S2O8/CF3COOH system. Propionic acid (ca. 70% yield), iso- and n-butyric acids (ca. 65% overall yield), and acetic acid (ca. 20%) are the major products obtained from the carboxylation of ethane, propane and methane, respectively, with vanadium playing a main catalytic role. The effects of the catalyst amount have been studied and overall turnover numbers (TONs) up to ca. 12 × 103 (for the ethane and propane conversions) or up to 3 × 103 (for the methane carboxylation to acetic acid) have been achieved for very high alkane-to-catalyst molar ratios which also promote the selectivity towards acetic acid.
The vanadium containing heteropolyacids H4[PMo11VO40] × 34H2O (HPA-1), H5[PMo10V2O40] × 32H2O (HPA-2) and H6[PMo9V3O40] × 34H2O (HPA-3) act as highly active catalysts for the direct transformation of light C1–C3 alkanes into the corresponding carboxylic acids in the presence of CO and in the K2S2O8/CF3COOH system. Figure optionsDownload as PowerPoint slide
Journal: Applied Catalysis A: General - Volume 332, Issue 1, 1 November 2007, Pages 159–165