Carbon nanotube-supported Cu-based catalysts for oxidative carbonylation of methanol to methyl carbonate: effect of nanotube pore size

2020 ◽  
Vol 10 (8) ◽  
pp. 2615-2626 ◽  
Author(s):  
Dan Zhao ◽  
Guoqiang Zhang ◽  
Lifei Yan ◽  
Lingqi Kong ◽  
Huayan Zheng ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Carbon Nanotube ◽  
Pore Size ◽  
Dimethyl Carbonate ◽  
Oxidative Carbonylation ◽  
Inner Diameter ◽  
Methyl Carbonate

The inner diameter of CNTs significantly affected the location, dispersion, autoreduction and stability of Cu species and thus the catalytic activity and stability for oxidative carbonylation of methanol to dimethyl carbonate.

scholarly journals Evolution of the pore and framework structure of NaY zeolite during alkali treatment and its effect on methanol oxidative carbonylation over a CuY catalyst

2020 ◽  
Vol 44 (11-12) ◽  
pp. 710-720
Author(s):  
Lifei Yan ◽  
Tingjun Fu ◽  
Jiajun Wang ◽  
Nilesh Narkhede ◽  
Zhong Li
Keyword(s):  
Catalytic Activity ◽  
Surface Area ◽  
Photoelectron Spectroscopy ◽  
Dimethyl Carbonate ◽  
Alkali Treatment ◽  
Oxidative Carbonylation ◽  
Framework Structure ◽  
Y Zeolite ◽  
Cage Structure ◽  
X Ray

Alkali treatment is widely used on aluminosilicate zeolites with high Si/Al ratios in order to fabricate mesopores in the framework. However, for zeolites with low Si/Al ratios, the effect of alkali treatment on the pore and framework structure needed further study. In this work, Y zeolite is treated with NaOH solutions of different concentrations and is used as the support for Cu-based catalysts for oxidative carbonylation of methanol to dimethyl carbonate. The physicochemical properties of the supports and corresponding catalysts are characterized by N2 adsorption–desorption, X-ray diffraction, X-ray fluorescence, transmission electron microscopy, inductively coupled plasma mass spectrometry, X-ray photoelectron spectroscopy, and H2-temperature-programmed reduction analyses. The results show that no obvious mesopores are formed under alkali treatment, even at high NaOH concentration. However, amorphous species present in the micropores of Y zeolite are removed, which increases the micropore surface area as well as the crystallinity. Simultaneously, the cage structure is partially destroyed, which also leads to a slight increase of the pore volume and surface area. The altered micropore structure eventually increases the content and accessibility of the exchanged Cu species, which is beneficial to the catalytic activity. When the concentration of NaOH is 0.6 M, the space time yield of dimethyl carbonate for the corresponding catalyst was 151.4 mg g−1 h−1 which is 3.3-fold higher than that of the untreated-Y-zeolite-supported Cu catalyst. However, further increasing the alkali treatment strength can seriously destroy the basic aluminosilicate structure of the Y zeolite and decrease its intrinsic ion-exchange capacity. This results in the formation of agglomerated CuO on the catalyst surface, which was not conducive to catalytic activity.

scholarly journals High catalytic activity of CuY catalysts prepared by high temperature anhydrous interaction for the oxidative carbonylation of methanol

RSC Advances ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 3293-3300 ◽  
Author(s):  
Yuchun Wang ◽  
Zhaorong Liu ◽  
Chao Tan ◽  
Hong Sun ◽  
Zhong Li
Keyword(s):  
Catalytic Activity ◽  
High Temperature ◽  
Atmospheric Pressure ◽  
Dimethyl Carbonate ◽  
Oxidative Carbonylation ◽  
High Catalytic Activity

The CuY catalysts prepared by high temperature anhydrous interaction were activated under different atmospheres and the activities were measured for the oxidative carbonylation of methanol to dimethyl carbonate under atmospheric pressure.

scholarly journals Isosorbide bis(methyl carbonate) synthesis from isosorbide and dimethyl carbonate: the key role of dual basic–nucleophilic catalysts

RSC Advances ◽  
2020 ◽  
Vol 10 (32) ◽  
pp. 18728-18739
Author(s):  
José R. Ochoa-Gómez ◽  
Leire Lorenzo-Ibarreta ◽  
Cristina Diñeiro-García ◽  
Olga Gómez-Jiménez-Aberasturi
Keyword(s):  
Catalytic Activity ◽  
Dimethyl Carbonate ◽  
Methyl Carbonate ◽  
Nucleophilic Catalysts

Basic–nucleophilic nitrogenated organocatalysts catalyze the synthesis of isosorbide bis(methyl carbonate), with nucleophilicity having an influence twice as much as basicity on catalytic activity.

scholarly journals Study of deactivation in mesocellular foam carbon (MCF-C) catalyst used in gas-phase dehydrogenation of ethanol

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yoottapong Klinthongchai ◽  
Seeroong Prichanont ◽  
Piyasan Praserthdam ◽  
Bunjerd Jongsomjit
Keyword(s):  
Catalytic Activity ◽  
Pore Size ◽  
Gas Phase ◽  
Surface Area ◽  
Active Sites ◽  
Operating Temperature ◽  
Coke Formation ◽  
Ethanol Conversion ◽  
Deactivation Of Catalyst ◽  
Dehydrogenation Of Ethanol

AbstractMesocellular foam carbon (MCF-C) is one the captivating materials for using in gas phase dehydrogenation of ethanol. Extraordinary, enlarge pore size, high surface area, high acidity, and spherical shape with interconnected pore for high diffusion. In contrary, the occurrence of the coke is a majority causes for inhibiting the active sites on catalyst surface. Thus, this study aims to investigate the occurrence of the coke to optimize the higher catalytic activity, and also to avoid the coke formation. The MCF-C was synthesized and investigated using various techniques. MCF-C was spent in gas-phase dehydrogenation of ethanol under mild conditions. The deactivation of catalyst was investigated toward different conditions. Effects of reaction condition including different reaction temperatures of 300, 350, and 400 °C on the deactivation behaviors were determined. The results indicated that the operating temperature at 400 °C significantly retained the lowest change of ethanol conversion, which favored in the higher temperature. After running reaction, the physical properties as pore size, surface area, and pore volume of spent catalysts were decreased owing to the coke formation, which possibly blocked the pore that directly affected to the difficult diffusion of reactant and caused to be lower in catalytic activity. Furthermore, a slight decrease in either acidity or basicity was observed owing to consumption of reactant at surface of catalyst or chemical change on surface caused by coke formation. Therefore, it can remarkably choose the suitable operating temperature to avoid deactivation of catalyst, and then optimize the ethanol conversion or yield of acetaldehyde.

Non-mercury catalytic acetylene hydrochlorination over Ru catalysts enhanced by carbon nanotubes

RSC Advances ◽  
2015 ◽  
Vol 5 (12) ◽  
pp. 9002-9008 ◽  
Author(s):  
Guangbi Li ◽  
Wei Li ◽  
Haiyang Zhang ◽  
Yanfeng Pu ◽  
Mengxia Sun ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Catalytic Activity ◽  
Acetylene Hydrochlorination ◽  
Ru Catalysts ◽  
Inner Diameter

Ru catalysts deposited inside the channels of the CNTs show higher catalytic activity. Ru-in-CNT catalyst exhibited an acetylene conversion of 95.0% at 170 °C and 10 h. CNTs with an inner diameter of 3–7 nm can functionalize as an efficient support.

Active Pd(ii) complexes: enhancing catalytic activity by ligand effect for carbonylation of methyl nitrite to dimethyl carbonate

2017 ◽  
Vol 7 (17) ◽  
pp. 3785-3790 ◽  
Author(s):  
Hong-Zi Tan ◽  
Zhi-Qiao Wang ◽  
Zhong-Ning Xu ◽  
Jing Sun ◽  
Zhe-Ning Chen ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Dimethyl Carbonate ◽  
Ligand Effect ◽  
Methyl Nitrite ◽  
Catalytic Activities

The catalytic activities of Pd(ii) complexes for carbonylation of methyl nitrite to dimethyl carbonate could be enhanced by ligand effect.

Porous Pt Aggregates Deposited on a Carbon Nanotube Film with High Catalytic Activity and Durability

2016 ◽  
Vol 3 (11) ◽  
pp. 1908-1914 ◽  
Author(s):  
Yun Chen ◽  
Xiao Xia Wang ◽  
Bing Li ◽  
Xin Xin Huang ◽  
Jian Nong Wang
Keyword(s):  
Catalytic Activity ◽  
Carbon Nanotube ◽  
High Catalytic Activity ◽  
Carbon Nanotube Film

scholarly journals Lithium Methyl Carbonate as a Reaction Product of Metallic Lithium and Dimethyl Carbonate

2006 ◽  
Vol 9 (2) ◽  
pp. A64-A68 ◽  
Author(s):  
G. V. Zhuang ◽  
H. Yang ◽  
P. N. Ross ◽  
K. Xu ◽  
T. R. Jow
Keyword(s):  
Dimethyl Carbonate ◽  
Metallic Lithium ◽  
Methyl Carbonate

Tenfold catalytic activity enhancement of Pt∕C by doping with single walled carbon nanotube for methanol oxidation

2007 ◽  
Vol 90 (6) ◽  
pp. 063112 ◽  
Author(s):  
Jayasri Narayanamoorthy ◽  
Sumitha Durairaj ◽  
Youngsik Song ◽  
Yuan Xu ◽  
Jaewu Choi
Keyword(s):  
Catalytic Activity ◽  
Carbon Nanotube ◽  
Methanol Oxidation ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Activity Enhancement
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