کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
40763 45864 2012 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Influence of formic acid and water on the [Pd(OAc)2(dppp)] catalyzed ethene–carbon monoxide copolymerization carried out in aprotic organic solvents
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Influence of formic acid and water on the [Pd(OAc)2(dppp)] catalyzed ethene–carbon monoxide copolymerization carried out in aprotic organic solvents
چکیده انگلیسی

The copolymerization of ethene with carbon monoxide catalyzed by [Pd(OAc)2(dppp)] in an aprotic solvent such as 1,4-dioxane or nitromethane is efficiently promoted both by H2O and HCOOH and yields a perfectly alternating polyketone (PK). The influence of the concentration of the promoters, pressure and temperature on the catalyst productivity and the limiting viscosity number (LVN) has been studied. The productivity increases with the increase of temperature and pressure. The LVN increases upon increasing the pressure and lowering the temperature. At 363 K and 9.0 MPa, in HCOOH/H2O/1-4,dioxane (2.7/1.35/1 molar ratio), the productivity is 37.50 kgPK (gPd h)−1 (LVN 2.77 dL g−1).LVN lowers upon increasing the concentration of the acid, suggesting that it is involved in the protonolysis chain-transfer process.

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► [Pd(OAc)2(dppp)] as catalyst for the ethene–CO copolymerization.
► Best results in 1,4-dioxane-H2O-HCOOH as reaction medium.
► Productivity and molecular weight higher than in methanol.
► Productivity increases by increasing pressure and temperature.
► Molecular weight increases by increasing pressure.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Catalysis A: General - Volume 449, 27 December 2012, Pages 198–202
نویسندگان
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