3D graphene aerogel anchored tungstophosphoric acid catalysts: Characterization and catalytic performance for levulinic acid esterification with ethanol

In this work, we demonstrate a facile strategy to synthesize a novel three-dimensional (3D) graphene aerogel-supported and graphene quantum dots-modified γ-MnOOH nanotubes as a highly efficient electrocatalyst.

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Efficient and Reusable Silica Gel Supported Metal Ionic Liquid Catalysts for Palmitic Acid Esterification to Biodiesel

Journal of the chemical society of pakistan ◽

10.52568/000014 ◽

2021 ◽

Vol 43 (1) ◽

pp. 1-1

Author(s):

Guo Yingwei Guo Yingwei ◽

Chen Xuedan Chen Xuedan ◽

Yan Shiting Yan Shiting ◽

Zhang Zhengliang Zhang Zhengliang ◽

Chen Yuqin Chen Yuqin ◽

...

Keyword(s):

Ionic Liquid ◽

Palmitic Acid ◽

Silica Gel ◽

High Surface ◽

High Surface Area ◽

Kinetic Studies ◽

Catalytic Performance ◽

Reaction Conditions ◽

Acid Esterification ◽

Supported Metal

A series of silica gel (SG) supported metal ionic liquid catalysts (x[Bmim]Cl-CrCl3/SG) were synthesized and exploited for the esterification of palmitic acid (PA) with methanol (ML) to produce biodiesel efficiently. The 10%[Bmim]Cl-CrCl3/SG catalyst with high surface area and desirable acidity exhibited the best catalytic performance and reusability after six consecutive running cycles. Based on the response surface analysis, the optimal reaction conditions were obtained as follows: methanol/acid mole ratio = 11:1 mol/mol, catalyst amount = 5.3 wt%, reaction time = 65 min, as well as reaction temperature = 373 K, reaching to a biodiesel yield of 96.1%. Further kinetic studies demonstrated that the esterification of PA with ML obeyed 1.41 order kinetics for acid concentration with the activation energy of 16.88 kJ/mol

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Kinetic Modeling of scCO2-Assisted Levulinic Acid Esterification with Ethanol Using Amberlyst-15 as a Catalyst in a Batch Reactor

Energy & Fuels ◽

10.1021/acs.energyfuels.1c01967 ◽

2021 ◽

Author(s):

Diego Trevisan Melfi ◽

Marcelo Kaminski Lenzi ◽

Luiz Pereira Ramos ◽

Marcos Lúcio Corazza

Keyword(s):

Kinetic Modeling ◽

Levulinic Acid ◽

Batch Reactor ◽

Amberlyst 15 ◽

Acid Esterification

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Single step conversion of cellulose to levulinic acid using temperature-responsive dodeca-aluminotungstic acid catalysts

Green Chemistry ◽

10.1039/c5gc01730k ◽

2016 ◽

Vol 18 (3) ◽

pp. 742-752 ◽

Cited By ~ 59

Author(s):

Zhong Sun ◽

Lifang Xue ◽

Shengtian Wang ◽

Xiaohong Wang ◽

Junyou Shi

Keyword(s):

Levulinic Acid ◽

Single Step ◽

Acid Catalysts ◽

One Pot ◽

Temperature Responsive

A new series of heteropolyacids [(CH3)3NCH2CH2OH]nH5−nAlW12O40 are used to catalyse the single step conversion of cellulose into levulinic acid (LA). The highest reported yield of LA directly from cellulose was achieved with 74.8% yield and 98.9% conversion in one pot.

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Ultralight, Ultraflexible, Anisotropic, Highly Thermally Conductive Graphene Aerogel Films

Molecules ◽

10.3390/molecules26226867 ◽

2021 ◽

Vol 26 (22) ◽

pp. 6867

Author(s):

Zheng Liu ◽

Qinsheng Wang ◽

Linlin Hou ◽

Yingjun Liu ◽

Zheng Li

Keyword(s):

Thermal Conductivity ◽

Expansion Method ◽

Graphene Aerogel ◽

3D Graphene ◽

Graphene Layers ◽

Thermal Insulating ◽

Graphene Films ◽

High Anisotropy ◽

Thermally Conductive ◽

Aerogel Films

Graphene aerogels have attracted much attention as a promising material for various applications. The unusually high intrinsic thermal conductivity of individual graphene sheets makes an obvious contrast with the thermal insulating performance of assembled 3D graphene materials. We report the preparation of anisotropy 3D graphene aerogel films (GAFs) made from tightly packed graphene films using a thermal expansion method. GAFs with different thicknesses and an ultimate low density of 4.19 mg cm−3 were obtained. GAFs show high anisotropy on average cross-plane thermal conductivity (K⊥) and average in-plane thermal conductivity (K||). Additionally, uniaxially compressed GAFs performed a large elongation of 11.76% due to the Z-shape folding of graphene layers. Our results reveal the ultralight, ultraflexible, highly thermally conductive, anisotropy GAFs, as well as the fundamental evolution of macroscopic assembled graphene materials at elevated temperature.

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