Deoligomerization of siloxanes with dimethyl carbonate over solid-base catalysts

2001 ◽  
pp. 1838-1839 ◽  
Author(s):  
Masaki Okamoto ◽  
Kuon Miyazaki ◽  
Akihiro Kado ◽  
Eiichi Suzuki
Keyword(s):  
Dimethyl Carbonate ◽  
Solid Base ◽  
Solid Base Catalysts ◽  
Base Catalysts

Synthesis of dimethyl carbonate from urea and methanol over solid base catalysts

2006 ◽  
Vol 7 (1) ◽  
pp. 6-10 ◽  
Author(s):  
Mouhua Wang ◽  
Hui Wang ◽  
Ning Zhao ◽  
Wei Wei ◽  
Yuhan Sun
Keyword(s):  
Dimethyl Carbonate ◽  
Solid Base ◽  
Solid Base Catalysts ◽  
Base Catalysts

Dimethyl carbonate synthesis over solid base catalysts derived from Ca–Al layered double hydroxides

2018 ◽  
Vol 72 (8) ◽  
pp. 1963-1971 ◽  
Author(s):  
Yunhui Liao ◽  
Feng Li ◽  
Xin Dai ◽  
Ning Zhao ◽  
Fukui Xiao
Keyword(s):  
Layered Double Hydroxides ◽  
Dimethyl Carbonate ◽  
Solid Base ◽  
Solid Base Catalysts ◽  
Base Catalysts ◽  
Double Hydroxides

scholarly journals Solid base catalysts derived from Ca–Al–X (X = F−, Cl− and Br−) layered double hydroxides for methanolysis of propylene carbonate

RSC Advances ◽  
2018 ◽  
Vol 8 (2) ◽  
pp. 785-791 ◽  
Author(s):  
Yunhui Liao ◽  
Feng Li ◽  
Yanfeng Pu ◽  
Feng Wang ◽  
Xin Dai ◽  
...  
Keyword(s):  
Propylene Carbonate ◽  
Layered Double Hydroxides ◽  
Dimethyl Carbonate ◽  
Solid Base ◽  
Solid Base Catalysts ◽  
Base Catalysts ◽  
Highly Active ◽  
Double Hydroxides

The CA-F− catalyst modified with Al3+ and F− was highly active and recyclable for dimethyl carbonate synthesis.

scholarly journals Water glass derived catalyst for the synthesis of glycerol carbonate via the transesterification reaction between glycerol and dimethyl carbonate

2019 ◽  
Vol 84 (6) ◽  
pp. 609-622
Author(s):  
Lanlan Xu ◽  
Song Wang ◽  
Patrick Okoye ◽  
Jianye Wang ◽  
Sanxi Li ◽  
...  
Keyword(s):  
Water Glass ◽  
Dimethyl Carbonate ◽  
Transesterification Reaction ◽  
Raw Material ◽  
Bet Surface Area ◽  
Solid Base ◽  
Glycerol Carbonate ◽  
Glycerol Conversion ◽  
Solid Base Catalysts ◽  
Base Catalysts

Water glasses with different modulus (mole ratio of SiO2 to Na2O) were applied as a raw material to prepare five solid base catalysts for the synthesis of glycerol carbonate (GC) by the transesterification reaction between glycerol and dimethyl carbonate (DMC). The structure and properties of the five water glass-derived catalysts were investigated by XRD, FT-IR, FESEM, BET and acid?base titration methods. The catalysts with relatively low modulus, including 1.0, 1.5 and 2.0, presented good catalytic abilities, among which the catalyst derived from water glass with 2.0 modulus (WG-2.0) was chosen as the optimal catalyst in the synthesis of GC. This was because WG- -2.0 showed the highest BET surface area, relatively high total basicity, and needed a less amount of NaOH during the preparation process. In the optimization experiments, this catalyst exhibited good catalytic ability with the glycerol conversion of 96.3 % and GC yield of 94.1 % under the condition of glycerol to DMC mole ratio of 1:4, WG-2.0 amount of 4 wt. %, reaction temperature of 348 K and reaction time of 90 min. Furthermore, the reusability experiment of WG-2.0 was also conducted and the results indicated that WG- -2.0 could be reused five times without significant reduction in its catalytic ability.

scholarly journals A facile synthesis of glycerol carbonate by transesterification of glycerol with dimethyl carbonate: Ceria based catalysts

2019 ◽  
Vol 62 (4) ◽  
Author(s):  
Venkatesh Venkatesh ◽  
Mohamed Shamshuddin Sathgatta Zaheeruddin ◽  
Pratap Srinivasa Raghavendra
Keyword(s):  
Dimethyl Carbonate ◽  
Molar Ratio ◽  
Solid Base ◽  
Glycerol Carbonate ◽  
Impregnation Method ◽  
Icp Oes ◽  
Facile Synthesis ◽  
Solid Base Catalysts ◽  
Base Catalysts ◽  
Ft Ir

Abstract. Solid base catalysts such as Ceria-Zirconia-Magnesia with different mole ratio of magnesium were prepared by impregnation method and characterized by CO2-TPD, PXRD, FT-IR and ICP-OES analysis. The catalytic activity of the catalysts was tested in the liquid phase transesterification of glycerol with dimethyl carbonate to synthesise glycerol carbonate. Optimization of reaction condition was carried out by varying the molar ratio of the reactants, temperature and time. The highest yield (97 %) of glycerol carbonate was obtained at a reactant molar ratio of 1:3 at 120 °C in 6 h. Study of reusability and reactivation of solid base catalyst was also taken up. A suitable base catalysed mechanism for the formation of glycerol carbonate is proposed.Resumen. Se prepararon catalizadores de base sólida como Ceria-Zirconia-Magnesia con diferentes proporciones molares de magnesio mediante el método de impregnación y se caracterizaron por análisis de CO2-TPD, PXRD, FT-IR e ICP-OES. La actividad catalítica de los catalizadores se probó en la transesterificación en fase líquida de glicerol con carbonato de dimetilo para sintetizar carbonato de glicerol. La optimización de las condiciones de reacción se llevó a cabo variando la relación molar de los reactivos, la temperatura y el tiempo. El mayor rendimiento (97 %) de carbonato de glicerol se obtuvo a una relación molar reactiva de 1:3 a 120 °C en 6 h. También se realizó un estudio de la reutilización y reactivación del catalizador de base sólida. Se propone un mecanismo catalítico básico adecuado para la formación de carbonato de glicerol.

ChemInform Abstract: Deoligomerization of Siloxanes with Dimethyl Carbonate over Solid-Base Catalysts.

ChemInform ◽  
2010 ◽  
Vol 33 (2) ◽  
pp. no-no
Author(s):  
Masaki Okamoto ◽  
Kuon Miyazaki ◽  
Akihiro Kado ◽  
Eiichi Suzuki
Keyword(s):  
Dimethyl Carbonate ◽  
Solid Base ◽  
Solid Base Catalysts ◽  
Base Catalysts
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