Synthesis of ethyl levulinate from cellulose over a double acid site catalyst

2021 ◽  
Author(s):  
Zhihang Huang ◽  
Songyuan Hao ◽  
Hong Yuan
Keyword(s):  
Acid Site ◽  
Ethyl Levulinate

Synthesis and Evaluation of Levulinic Ester as Biodiesel Additives

2020 ◽  
Vol 71 (8) ◽  
pp. 21-26
Author(s):  
Elena-Emilia Oprescu ◽  
Cristina-Emanuela Enascuta ◽  
Elena Radu ◽  
Vasile Lavric
Keyword(s):  
Maximum Yield ◽  
Strength Distribution ◽  
Point Of View ◽  
Reaction Parameters ◽  
X Ray ◽  
Ethyl Levulinate ◽  
Ft Ir ◽  
Ir Analysis ◽  
Biodiesel Blend ◽  
Acid Strength Distribution

In this study, the SO42-/TiO2-La2O3-Fe2O3 catalyst was prepared and tested in the conversion of fructose to ethyl levulinate . The catalyst was characterized from the point of view of the textural analysis, FT-IR analysis, acid strength distribution, X-ray powder diffraction and pyridine adsorption IR spectra. The influence of the reaction parameters on the ethyl levulinate yield was study. The maximum yield of 37.95% in levulinate esters was obtained at 180 �C, 2 g catalyst and 4 h reaction time. The effect of ethyl levulinate addition to diesel-biodiesel blend in different rates, i.e, 0.5, 1, 2.5, 5 (w.t %) on density, kinematic viscosity and flash point was evaluated and compared with the European specification.

Lewis Acid Site-Promoted Single-Atomic Cu Catalyzes Electrochemical CO2 Methanation

Nano Letters ◽  
2021 ◽  
Author(s):  
Shenghua Chen ◽  
Bingqing Wang ◽  
Jiexin Zhu ◽  
Liqiang Wang ◽  
Honghui Ou ◽  
...  
Keyword(s):  
Lewis Acid ◽  
Acid Site ◽  
Lewis Acid Site ◽  
Co2 Methanation

Effects of Brønsted acid site proximity in chabazite zeolites on OH infrared spectra and protolytic propane cracking kinetics

2021 ◽  
Vol 395 ◽  
pp. 210-226
Author(s):  
Philip M. Kester ◽  
Jerry T. Crum ◽  
Sichi Li ◽  
William F. Schneider ◽  
Rajamani Gounder
Keyword(s):  
Infrared Spectra ◽  
Acid Site ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Bronsted Acid Site ◽  
Brønsted Acid Site ◽  
Brönsted Acid ◽  
Propane Cracking

Direct conversion of cellulose to ethyl levulinate catalysed by modified fibrous mesoporous silica nanospheres in a co-solvent system

2021 ◽  
Vol 45 (12) ◽  
pp. 5526-5539
Author(s):  
Zhi Zhang ◽  
Zhihang Huang ◽  
Hong Yuan
Keyword(s):  
Mesoporous Silica ◽  
Solvent System ◽  
Direct Conversion ◽  
Reaction Yield ◽  
Silica Nanospheres ◽  
Ethyl Levulinate ◽  
System A ◽  
System P ◽  
Mesoporous Silica Nanospheres

A KCC-1/Al–SO3H catalyst with Si/Al = 5 was prepared to directly catalyse the synthesis of ethyl levulinate from cellulose in an ethanol/toluene co-solvent system. A reaction yield of 28.8 mol% was achieved after 6 h at 200 °C.

scholarly journals Theoretical Study of Zirconium Isomorphous Substitution into Zeolite Frameworks

Molecules ◽  
2019 ◽  
Vol 24 (24) ◽  
pp. 4466
Author(s):  
Duichun Li ◽  
Bin Xing ◽  
Baojun Wang ◽  
Ruifeng Li
Keyword(s):  
Acid Site ◽  
Density Functional ◽  
Theoretical Study ◽  
Atomic Radius ◽  
Acid Sites ◽  
Isomorphous Substitution ◽  
Dispersion Correction ◽  
Brønsted Acidity ◽  
Functional Theory ◽  
Brönsted Acidity

Systematic periodic density functional theory computations including dispersion correction (DFT-D) were carried out to determine the preferred location site of Zr atoms in sodalite (SOD) and CHA-type topology frameworks, including alumino-phosphate-34 (AlPO-34) and silico-alumino-phosphate-34 (SAPO-34), and to determine the relative stability and Brönsted acidity of Zr-substituted forms of SOD, AlPO-34, and SAPO-34. Mono and multiple Zr atom substitutions were considered. The Zr substitution causes obvious structural distortion because of the larger atomic radius of Zr than that of Si, however, Zr-substituted forms of zeolites are found to be more stable than pristine zeolites. Our results demonstrate that in the most stable configurations, the preferred favorable substitutions of Zr in substituted SOD have Zr located at the neighboring sites of the Al-substituted site. However, in the AlPO-34 and SAPO-34 frameworks, the Zr atoms are more easily distributed in a dispersed form, rather than being centralized. Brönsted acidity of substituted zeolites strongly depends on Zr content. For SOD, substitution of Zr atoms reduces Brönsted acidity. However, for Zr-substituted forms of AlPO-34 and SAPO-34, Brönsted acidity of the Zr-O(H)-Al acid sites are, at first, reduced and, then, the presence of Zr atoms substantially increased Brönsted acidity of the Zr-O(H)-Al acid site. The results in the SAPO-34-Zr indicate that more Zr atoms substantially increase Brönsted acidity of the Si-O(H)-Al acid site. It is suggested that substituted heteroatoms play an important role in regulating and controlling structural stability and Brönsted acidity of zeolites.

Inter-integration reactive distillation with vapor permeation for ethyl levulinate production: Modeling, process analysis and design

2021 ◽  
pp. 116962
Author(s):  
Kai Wu ◽  
Hong Li ◽  
Xingang Li ◽  
Wentao Han ◽  
Chunkai Guo ◽  
...  
Keyword(s):  
Reactive Distillation ◽  
Process Analysis ◽  
Analysis And Design ◽  
Ethyl Levulinate ◽  
Vapor Permeation ◽  
Modeling Process ◽  
Production Modeling

Efficient production of ethyl levulinate from cassava over Al 2 (SO 4 ) 3 catalyst in ethanol–water system

2017 ◽  
Vol 26 (1) ◽  
pp. 115-120 ◽  
Author(s):  
Jin Tan ◽  
Qiying Liu ◽  
Lungang Chen ◽  
Tiejun Wang ◽  
Longlong Ma ◽  
...  
Keyword(s):  
Water System ◽  
Efficient Production ◽  
Ethyl Levulinate

Structure and Dynamics of a Brønsted Acid Site in a Zeolite:  An ab Initio Study of Hydrogen Sodalite

1998 ◽  
Vol 102 (20) ◽  
pp. 3974-3979 ◽  
Author(s):  
Ettore Fois ◽  
Aldo Gamba ◽  
Gloria Tabacchi
Keyword(s):  
Ab Initio ◽  
Acid Site ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Ab Initio Study ◽  
Structure And Dynamics ◽  
Bronsted Acid Site ◽  
Brønsted Acid Site ◽  
Brönsted Acid
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