Amorphous magnesium substituted mesoporous aluminophosphate: An acid-base sites synergistic catalysis for transesterification of diethyl carbonate and dimethyl carbonate in fixed-bed reactor

2020 ◽  
Vol 292 ◽  
pp. 109757 ◽  
Author(s):  
Hefang Wang ◽  
Yiyan Wang ◽  
Wenrui Liu ◽  
Huanhuan Cai ◽  
Jianhua Lv ◽  
...  
Keyword(s):  
Dimethyl Carbonate ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Diethyl Carbonate ◽  
Acid Base ◽  
Synergistic Catalysis

scholarly journals Acid–base sites synergistic catalysis over Mg–Zr–Al mixed metal oxide toward synthesis of diethyl carbonate

RSC Advances ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 4695-4702 ◽  
Author(s):  
Tingting Yan ◽  
Weihan Bing ◽  
Ming Xu ◽  
Yinwen Li ◽  
Yusen Yang ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Catalytic Performance ◽  
Transformation Process ◽  
Mixed Metal Oxide ◽  
Diethyl Carbonate ◽  
Mixed Metal Oxides ◽  
Acid Base ◽  
Phase Transformation Process ◽  
Mixed Metal ◽  
Synergistic Catalysis

Mg/Zr/Al mixed metal oxides were prepared via a facile phase transformation process of hydrotalcite precursors, which showed acid–base sites synergistic catalytic performance toward the synthesis of diethyl carbonate from ethanol and urea.

Synthesis of Dimethyl Carbonate from Methyl Carbamate and Methanol Using a Fixed-Bed Reactor

2012 ◽  
Vol 35 (12) ◽  
pp. 2183-2188 ◽  
Author(s):  
D. Wang ◽  
X. Zhang ◽  
W. Wei ◽  
Y. Sun
Keyword(s):  
Dimethyl Carbonate ◽  
Fixed Bed ◽  
Fixed Bed Reactor

scholarly journals Influence of Substrate Concentration on Kinetic Parameters of Ethanol Dehydration in MFI and CHA Zeolites and Relation of These Kinetic Parameters to Acid–Base Properties

Catalysts ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 51
Author(s):  
Pavel Čičmanec ◽  
Jiří Kotera ◽  
Jan Vaculík ◽  
Roman Bulánek
Keyword(s):  
Activation Energy ◽  
Kinetic Parameters ◽  
Catalyst Deactivation ◽  
Fixed Bed ◽  
Fixed Bed Reactor ◽  
Ethanol Dehydration ◽  
Acid Base ◽  
Diffusion Limitations ◽  
Zeolite Lattice ◽  
Base Properties

The catalytic activity of zeolites is often related to their acid–base properties. In this work, the relationship between the value of apparent activation energy of ethanol dehydration, measured in a fixed bed reactor and by means of a temperature-programmed surface reaction (TPSR) depending on the amount of ethanol in the zeolite lattice and the value of activation energy of H/D exchange as a measure of acid–base properties of MFI and CHA zeolites, was studied. Tests in a fixed bed reactor were unable to provide reliable reaction kinetics data due to internal diffusion limitations and rapid catalyst deactivation. Only the TPSR method was able to provide activation energy values comparable to the activation energy values obtained from the H/D exchange rate measurements. In addition, for CHA zeolite, it has been shown that the values of ethanol dehydration activation energies depend on the amount of ethanol in the CHA framework, and this effect can be attributed to the substrate clustering effects supporting the deprotonation of zeolite Brønsted centers.

Magnesium Aluminum Spinel as an Acid–Base Catalyst for Transesterification of Diethyl Carbonate with Dimethyl Carbonate

2014 ◽  
Vol 144 (9) ◽  
pp. 1602-1608 ◽  
Author(s):  
Jun Wang ◽  
Lu Han ◽  
Shuping Wang ◽  
Jingcai Zhang ◽  
Yanzhao Yang
Keyword(s):  
Dimethyl Carbonate ◽  
Diethyl Carbonate ◽  
Base Catalyst ◽  
Acid Base ◽  
Aluminum Spinel ◽  
Magnesium Aluminum Spinel

scholarly journals Readily-fabricated supported MgO catalysts for efficient and green synthesis of diethyl carbonate from ethyl carbamate and ethanol

RSC Advances ◽  
2021 ◽  
Vol 11 (25) ◽  
pp. 15477-15485
Author(s):  
Fengjiao Li ◽  
Liguo Wang ◽  
Shuang Xu ◽  
Shuting Liang ◽  
Ningning Zhang
Keyword(s):  
Green Synthesis ◽  
Fixed Bed ◽  
Ethyl Carbamate ◽  
Fixed Bed Reactor ◽  
Diethyl Carbonate

The 10% MgO/γ-Al2O3 catalyst exhibited superior activities towards DEC synthesis from EC and ethanol in the fixed bed reactor.

Role of filter media in an anaerobic fixed-bed reactor

1995 ◽  
Vol 31 (9) ◽  
pp. 137-144 ◽  
Author(s):  
T. Miyahara ◽  
M. Takano ◽  
T. Noike
Keyword(s):  
Anaerobic Bacteria ◽  
Fixed Bed ◽  
Methanogenic Bacteria ◽  
The Other ◽  
Fixed Bed Reactor ◽  
Filter Media ◽  
Fixed Bed Reactors ◽  
Attached Bacteria ◽  
The Relationship

The relationship between the filter media and the behaviour of anaerobic bacteria was studied using anaerobic fixed-bed reactors. At an HRT of 48 hours, the number of suspended acidogenic bacteria was higher than those attached to the filter media. On the other hand, the number of attached methanogenic bacteria was more than ten times as higher than that of suspended ones. The numbers of suspended and deposited acidogenic and methanogenic bacteria in the reactor operated at an HRT of 3 hours were almost the same as those in the reactor operated at an HRT of 48 hours. Accumulation of attached bacteria was promoted by decreasing the HRT of the reactor. The number of acidogenic bacteria in the reactor packed sparsely with the filter media was higher than that in the closely packed reactor. The number of methanogenic bacteria in the sparsely packed reactor was lower than that in the closely packed reactor.

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