Methoxycarbonylation of 1,6-hexanediamine with dimethyl carbonate to dimethylhexane-1,6-dicarbamate over Zn/SiO2 catalyst

RSC Advances ◽  
2016 ◽  
Vol 6 (56) ◽  
pp. 51446-51455 ◽  
Author(s):  
Lina Zhang ◽  
Hongguang Li ◽  
Feng Li ◽  
Yanfeng Pu ◽  
Ning Zhao ◽  
...  
Keyword(s):  
Dimethyl Carbonate ◽  
Catalytic Performance

The activated Zn(OAc)2 in Zn/SiO2 catalysts facilitates the activation of DMC which leads to better catalytic performance.

Oxidative Carbonylation of Methanol to Dimethyl Carbonate by Chlorine-Free Homogeneous and Immobilized 2,2'-Bipyrimidine Modified Copper Catalyst

2007 ◽  
Vol 72 (8) ◽  
pp. 1094-1106 ◽  
Author(s):  
Szilárd Csihony ◽  
László T. Mika ◽  
Gábor Vlád ◽  
Katalin Barta ◽  
Christian P. Mehnert ◽  
...  
Keyword(s):  
High Pressure ◽  
Dimethyl Carbonate ◽  
Copper Catalyst ◽  
Catalytic Performance ◽  
Spectroscopic Studies ◽  
Oxidative Carbonylation ◽  
Cu Catalyst

A chlorine-free catalyst, prepared in situ from Cu(II) acetate and 2,2'-bipyrimidine, can be used for the oxidative carbonylation of methanol to dimethyl carbonate. In situ high pressure IR and NMR spectroscopic studies suggest the formation of [Cu(2,2'-bipyrimidine)(CO)- (OMe)] as one of the key intermediates. The catalytic performance of the 2,2'-bipyrimidine-modified Cu-catalyst is similar to the CuCl-based system. The chlorine free catalyst can be immobilized by using the copolymer of 5-vinyl-2,2'-bipyrimidine and styrene.

Synthesis of Dimethyl Carbonate over Activated Carbon Supported Cu Based Catalysts

2014 ◽  
Vol 953-954 ◽  
pp. 1242-1245
Author(s):  
Wang Ruiyu ◽  
Li Zhong
Keyword(s):  
Activated Carbon ◽  
Vapor Phase ◽  
Dimethyl Carbonate ◽  
Catalytic Performance ◽  
Copper Salt ◽  
Precipitation Method ◽  
Catalyst Structure ◽  
Loading Amount ◽  
Copper Based Catalyst

The supported chloride-free copper based catalyst was prepared by deposition-precipitation method and used to catalyze the direct vapor-phase oxycarbonylation of methanol to dimethyl carbonate (DMC). The effect of reductive agent and copper salt precursor on catalyst structure and catalytic performance were investigated, the catalysts were characterized by XRD, H2-TPR techniques. Using Cu (CH3COO)2 as precursor, glucose as reductive agent, when loading amount was 17.1%, the Cu2O/AC catalyst shows the best performance for DMC synthesis. Under the condition of CO/MeOH/O2=5/11/1, SV=6625h-1, the average STY of DMC in 9 hrs running was 71.96mg/(g·h), and selectivity of DMC was 83.13%.

Catalytic synthesis of glycol dicarbonate from glycol and dimethyl carbonate by transesterification

2019 ◽  
Vol 43 (5-6) ◽  
pp. 211-216 ◽  
Author(s):  
Ruiyang Chen ◽  
Tong Chen ◽  
Xiaojia Hu ◽  
Youkun Fan ◽  
Gongying Wang
Keyword(s):  
Catalytic Activity ◽  
Dimethyl Carbonate ◽  
Reaction System ◽  
Catalytic Performance ◽  
Catalytic Synthesis ◽  
Catalyst Screening ◽  
Acidic Catalysts ◽  
Medium Strength ◽  
Basic Catalysts

Glycol dicarbonate is successfully synthesized via transesterification of glycol with dimethyl carbonate. A catalyst screening is performed by studying the effect of acidity and alkalinity on the catalytic performance. The results indicate that compared with acidic catalysts, high conversions and yields are obtained with basic catalysts. Ca(OH)2, with medium-strength alkalinity, exhibits excellent catalytic activity with glycol dicarbonate yields of 95%-99% when using a fractionation reaction system.

A Novel Energy Band Match Method and a Highly Efficient CuO–Co3O4@SiO2 Catalyst for Dimethyl Carbonate Synthesis from CO2

2021 ◽  
Vol 13 (1) ◽  
pp. 115-122
Author(s):  
Meng Zhang
Keyword(s):  
Energy Band ◽  
Dimethyl Carbonate ◽  
Materials Science ◽  
Catalytic Performance ◽  
Catalyst Design ◽  
Structure Calculation ◽  
Match Method ◽  
Matching Method ◽  
Catalyst Structure ◽  
Novel Method

The present research on dimethyl carbonate (DMC) synthesis from CO2 was short of effective theoretical guidance and catalyst design was also blind. A kind of regular relationship was found from catalyst structure calculation and activity experiments. Therefore, a novel energy band matching method was proposed. After substantial verification experiments, it was proved to be correct. Whether one certain catalyst has catalytic activity can be judged predictably according to this novel method. Novel and efficient catalysts can be designed or selected on the basis of designer's wishes. Based on this method, three efficient catalysts were prepared and CuO–Co3O4@SiO2 catalyst had the best catalytic performance. In a word, once it is applied in catalysts research, there will be a huge progress in catalysis and materials science fields.

Synthesis of Dimethyl Carbonate from Carbon Dioxide, Propylene Epoxide and Methanol

2013 ◽  
Vol 734-737 ◽  
pp. 2120-2123
Author(s):  
Tao Fang ◽  
Chong Jing Liao ◽  
Zhen Xiao Duan ◽  
Guo Zhi Fan
Keyword(s):  
Carbon Dioxide ◽  
Rare Earth ◽  
Dimethyl Carbonate ◽  
Catalytic Performance ◽  
Rare Earth Oxides ◽  
Co Catalyst

Dimethyl carbonate (DMC) was synthesized from carbon dioxide, propylene epoxide (PO) and methanol. The catalytic performance of K2CO3, KI, rare earth oxides including CeO2, Y2O3, La2O3 and Yb2O3 was investigated. Acceptable conversion of PO but poor selectivity to DMC was obtained using K2CO3 or KI as the sole catalyst compared to that obtained in the presence of rare earth oxides. Significant improvement in the selectivity to DMC was obtained catalyzed by co-catalyst composed of K2CO3 and Yb2O3, and 42.4% selectivity to DMC, which is higher than that obtained using K2CO3 or Yb2O3 as the sole catalyst under the identical conditions, was obtained. The influence of the amount of PO was also investigated, and the results showed that the conversion of PO is dependent on its amount.

NaZSM-5-catalyzed dimethyl carbonate synthesis via the transesterification of ethylene carbonate with methanol

2011 ◽  
Vol 89 (5) ◽  
pp. 544-548 ◽  
Author(s):  
Zhen-Zhen Yang ◽  
Xiao-Yong Dou ◽  
Fang Wu ◽  
Liang-Nian He
Keyword(s):  
Dimethyl Carbonate ◽  
Ethylene Carbonate ◽  
Catalytic Performance ◽  
Fuel Oil ◽  
Molar Ratio ◽  
Catalyst Loading ◽  
X Ray Diffraction ◽  
Reaction Conditions ◽  
Simple Filtration ◽  
Slight Alteration

NaZSM-5 zeolite was found to be an efficient heterogeneous catalyst for the synthesis of dimethyl carbonate (DMC), which can serve as a building block, an additive to fuel oil, and an electrolyte in batteries, via the transesterification of ethylene carbonate (EC) with methanol. Notably, 77% DMC yield and 97% selectivity were achieved under mild reaction conditions. Furthermore, the effects of various reaction parameters such as catalyst loading, reaction time, and methanol/EC molar ratio on the catalytic performance were investigated in detail. This protocol was found to be applicable to a variety of alcohols, producing the corresponding dialkyl carbonates with moderate yields and selectivities. Moreover, the catalyst can be recovered by simple filtration with retention of catalytic activity; a stable crystal configuration and a slight alteration of its superficial structure were observed by X-ray diffraction and BET measurements.

Synthesis of Dimethyl Carbonate from Ethylene Carbonate and Methanol Over Nano-Catalysts Supported on CeO2–MgO

2015 ◽  
Vol 15 (10) ◽  
pp. 8330-8335 ◽  
Author(s):  
Jin Oh Jun ◽  
Joongwon Lee ◽  
Ki Hyuk Kang ◽  
In Kyu Song
Keyword(s):  
Dimethyl Carbonate ◽  
Ethylene Carbonate ◽  
Earth Metal ◽  
Catalytic Performance ◽  
Precipitation Method ◽  
Reaction Yield ◽  
Incipient Wetness Impregnation ◽  
Impregnation Method ◽  
Nano Catalyst ◽  
Nano Catalysts

A series of CeO2(X)–MgO(1−X) (X = 0, 0.25, 0.5, 0.75, and 1.0) nano-catalysts were prepared by a co-precipitation method for use in the synthesis of dimethyl carbonate from ethylene carbonate and methanol. Among the CeO2(X)–MgO(1−X) catalysts, CeO2(0.25)–MgO(0.75) nano-catalyst showed the best catalytic performance. Alkali and alkaline earth metal oxides (MO = Li2O, K2O, Cs2O, SrO, and BaO) were then supported on CeO2(0.25)–MgO(0.75) by an incipient wetness impregnation method with an aim of improving the catalytic performance of CeO2(0.25)–MgO(0.75). Basicity of the catalysts was determined by CO2-TPD experiments in order to elucidate the effect of basicity on the catalytic performance. The correlation between catalytic performance and basicity showed that basicity played an important role in the reaction. Yield for dimethyl carbonate increased with increasing basicity of the catalysts. Among the catalysts tested, Li2O/CeO2(0.25)–MgO(0.75) nano-catalyst with the largest basicity showed the best catalytic performance in the synthesis of dimethyl carbonate.

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