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.

In-situ infrared spectroscopic studies of hydroxyl in amphiboles at high pressure

2016 ◽  
Vol 101 (3) ◽  
pp. 706-712 ◽  
Author(s):  
Elizabeth C. Thompson ◽  
Andrew J. Campbell ◽  
Zhenxian Liu
Keyword(s):  
High Pressure ◽  
Spectroscopic Studies ◽  
Infrared Spectroscopic

Hybrid Ni Al layered double hydroxide: Characterization and in situ synchrotron XRD and vibrational spectroscopic studies under high-pressure

2019 ◽  
Vol 174 ◽  
pp. 152-158 ◽  
Author(s):  
Caroline S. de Matos ◽  
Marcelo M. Nóbrega ◽  
Marcia L.A. Temperini ◽  
Vera R.L. Constantino
Keyword(s):  
High Pressure ◽  
Layered Double Hydroxide ◽  
Spectroscopic Studies ◽  
Double Hydroxide ◽  
Synchrotron Xrd

scholarly journals In situ high-pressure spectroscopic studies using moissanite (4H-SiC) anvils

AIP Advances ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 095012 ◽  
Author(s):  
Jinbo Zhang ◽  
Xinli Zhao ◽  
Zhipeng Yan ◽  
Ye Yuan ◽  
Xin Li ◽  
...  
Keyword(s):  
High Pressure ◽  
Spectroscopic Studies

Behavior of phengite at high temperature and high pressure: In situ IR and Raman spectroscopic studies

2019 ◽  
Author(s):  
WENDI Liu ◽  
Yan Yang ◽  
Zeming Qi ◽  
Zhongping Wang ◽  
Weihua Huang ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Spectroscopic Studies ◽  
Raman Spectroscopic ◽  
In Situ Ir ◽  
Ir And Raman

scholarly journals Oxidative Carbonylation of Methanol to Dimethyl Carbonate in Ionic Liquid 1-Butyl-3-Methylimidazolium Hexafluorophosphate

2003 ◽  
Vol 2003 (9) ◽  
pp. 549-551 ◽  
Author(s):  
Tao Jiang ◽  
Buxing Han ◽  
Guoying Zhao ◽  
Yanhong Chang ◽  
Liang Gao ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Ionic Liquid ◽  
Supercritical Carbon Dioxide ◽  
Room Temperature ◽  
Dimethyl Carbonate ◽  
Room Temperature Ionic Liquid ◽  
Oxidative Carbonylation ◽  
Enhanced Selectivity ◽  
Supercritical Carbon

The synthesis of dimethyl carbonate (DMC) by oxidative carbonylation of methanol with PdCl2 as a catalyst was investigated in the room temperature ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF6]). The products were recovered in situ using supercritical carbon dioxide. Enhanced selectivity of DMC over this catalyst was observed in the synthesis in [bmim][PF6] compared with the situation without the ionic liquid (IL). The mixture of catalyst and [bmim][PF6] could be recycled.

In situ DRIFTS study on the oxidative carbonylation of methanol to dimethyl carbonate over Cuβ catalyst

2012 ◽  
Vol 40 (10) ◽  
pp. 1212-1221 ◽  
Author(s):  
Zeng-zhu WANG ◽  
Shou-ying HUANG ◽  
Yong-li SHEN ◽  
Sheng-ping WANG ◽  
Xin-bin MA
Keyword(s):  
Dimethyl Carbonate ◽  
Oxidative Carbonylation ◽  
In Situ Drifts

scholarly journals Synthesis of Dimethyl Carbonate from CO2 and Methanol over Zr-Based Catalysts with Different Chemical Environments

Catalysts ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 710
Author(s):  
Linmeng Huo ◽  
Tian Wang ◽  
Keng Xuan ◽  
Lei Li ◽  
Yanfeng Pu ◽  
...  
Keyword(s):  
Dimethyl Carbonate ◽  
Lewis Acid Site ◽  
Catalytic Performance ◽  
Lewis Base ◽  
X Ray Diffraction ◽  
Reaction Conditions ◽  
X Ray ◽  
Good Catalytic Activity ◽  
Adsorption Desorption

The adsorption and activation of both CO2 and methanol are mainly affected by the distance of the Lewis acid site, Zr4+, and Lewis base, Zr4+/O2−, of the Zr-based catalysts. In this paper, Zr-incorporated SBA-15 (Zr-SBA-15) and Zr-grafted SBA-15 (Zr/SBA-15) catalysts were prepared with different Zr environments, and were analyzed with N2 adsorption–desorption isotherms, X-ray diffraction, UV-vis spectra, and XPS. It was proposed that Zr-SBA-15 catalyst with Si-O-Zr-OH and Zr-O-Si-OH structure exhibited non-adjacent sites between Zr4+ and Zr4+/O2−, while Zr/SBA-15 catalyst with Zr-O-Zr-OH structure showed neighboring sites between Zr4+ and Zr4+/O2−. Furthermore, the Zr/SBA-15 catalyst exhibited good catalytic activity, while no DMC was detected over the Zr-SBA-15 catalyst at the same reaction conditions. For combined in situ infrared and catalytic performance, it was indicated that the methanol and CO2 could be activated to form DMC, only when the Zr4+ and Zr4+/O2− sites existed and were adjacent to each other in the Zr-O-Zr-OH of Zr/SBA-15 catalyst.

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