The role of ruthenium on the acidity of mixed alumina and silica phases and its impact on activity for ethanol dehydration

2021 ◽  
Author(s):  
Tanutporn Kamsuwan ◽  
Bunjerd Jongsomjit ◽  
José E. Herrera
Keyword(s):  
Ethanol Dehydration ◽  
Silica Phases

The role of lithium in stabilizing some high-temperature silica phases*

1973 ◽  
Vol 138 (1-4) ◽  
pp. 216-236
Author(s):  
Chi-Tang Li
Keyword(s):  
High Temperature ◽  
Silica Phases

Critical role of (100) facets on γ-Al2O3 for ethanol dehydration: Combined efforts of morphology-controlled synthesis and TEM study

2018 ◽  
Vol 556 ◽  
pp. 121-128 ◽  
Author(s):  
Jaekyoung Lee ◽  
Eun Jeong Jang ◽  
Hu Young Jeong ◽  
Ja Hun Kwak
Keyword(s):  
Critical Role ◽  
Controlled Synthesis ◽  
Ethanol Dehydration

Molecular reorientation in a dehydration process of an organic polar salt of 2,4-diaminotoluene/L(+)-tartaric acid

2017 ◽  
Vol 32 (1) ◽  
pp. 15-22
Author(s):  
Weicai Ju ◽  
Simin Qiu ◽  
Yaqiu Tao ◽  
Xiaodong Shen ◽  
Zhigang Pan
Keyword(s):  
Crystal Structures ◽  
Tartaric Acid ◽  
Variable Temperature ◽  
Ethanol Dehydration ◽  
X Ray Diffraction ◽  
Molecular Reorientation ◽  
X Ray ◽  
Hydrate Crystal ◽  
Dehydration Behavior

An organic polar hydrate was obtained through cocrystallization of 2,4-diaminotoluene (2,4-DAT) and L(+)-tartaric acid (TA) from ethanol. Dehydration behavior of the obtained hydrate was investigated using variable temperature powder X-ray diffraction (PXRD) and thermal analysis. Proton transfer from L(+)-TA to 2,4-DAT in both hydrate and dehydrated form was revealed via Fourier transform infrared spectroscopy. The crystal structures of both forms were determined using PXRD techniques. The similarities and differences between two crystal structures were analyzed and the role of water in the hydrate crystal structure was demonstrated.

scholarly journals Transition Metal B-Site Substitutions in LaAlO3 Perovskites Reorient Bio-Ethanol Conversion Reactions

Catalysts ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 344
Author(s):  
Quang Nguyen Tran ◽  
Olinda Gimello ◽  
Nathalie Tanchoux ◽  
Monica Ceretti ◽  
Stefania Albonetti ◽  
...  
Keyword(s):  
Heterogeneous Catalysts ◽  
Oxygen Vacancies ◽  
Sol Gel ◽  
Carbon Number ◽  
Ethanol Conversion ◽  
Ethanol Dehydration ◽  
Phase Conversion ◽  
Al Substitution ◽  
Dehydrogenation Of Ethanol

LaAlO3 perovskites, as such and with 25% molar Al substitution by Cu, Co, or Ga, have been prepared by sol-gel methods and tested as heterogeneous catalysts in the gas-phase conversion of ethanol. LaAlO3 presented a significant acidic character, with high formation of ethylene by ethanol dehydration. B-site substitutions increased the basicity of the catalysts, favoring the dehydrogenation of ethanol to acetaldehyde. The most reducible Cu- and Co-substituted materials, characterized by easier formation of surface oxygen vacancies, promoted the self-condensation of acetaldehyde by the Tishchenko mechanism, with formation of acetone and odd-carbon number products. Aldol coupling of acetaldehyde, favored on pure and Ga-substituted LaAlO3, led to the formation of butadiene and hexadiene. The role of Ga insertion, favoring both dehydrogenation of ethylene and dehydration of higher alcohols, corresponds to an amphoteric character. The formation of olefins and diolefins on all catalysts suggests that LaAl-based materials present the most acidic character among La-perovskites.

Kinetics and Mechanism of Ethanol Dehydration on γ-Al2O3: The Critical Role of Dimer Inhibition

ACS Catalysis ◽  
2013 ◽  
Vol 3 (4) ◽  
pp. 798-807 ◽  
Author(s):  
Joseph F. DeWilde ◽  
Hsu Chiang ◽  
Daniel A. Hickman ◽  
Christopher R. Ho ◽  
Aditya Bhan
Keyword(s):  
Critical Role ◽  
Kinetics And Mechanism ◽  
Ethanol Dehydration

The role of lithium in stabilizing some high-temperature silica phases*

1973 ◽  
Vol 138 (138) ◽  
pp. 216-236 ◽  
Author(s):  
Chi-Tang Li
Keyword(s):  
High Temperature ◽  
Silica Phases

scholarly journals Role of Lewis Acids of MIL-101(Cr) in the Upgrading of Ethanol to n-Butanol

2020 ◽  
Vol 2 ◽  
Author(s):  
Jian Zhou ◽  
Yuqin Tong ◽  
Yaohui He ◽  
Pengxiang Tu ◽  
Bing Xue ◽  
...  
Keyword(s):  
Particle Size ◽  
Linear Relationship ◽  
Diethyl Ether ◽  
Lewis Acids ◽  
Active Sites ◽  
Lewis Acidity ◽  
Ethanol Dehydration ◽  
Basic Sites

The upgrading of bioethanol to n-butanol has recently been a focus of considerable attention due to the advantages of n-butanol over bioethanol as a sustainable fuel. The efficiency of this reaction is highly dependent on the development of catalysts, where understanding how catalysts perform is essential. However, traditional catalysts are normally composed of several kinds of active sites that work together synergistically in reactions, making it challenging to identify the role that individual active sites play. Herein, we synthesized three chromium-based MOFs ((MIL-101(Cr), where MIL stands for Matériaux Institut Lavoisier) with different Lewis acidities but without any basic sites. The linear relationship between Lewis acidities and their dehydration and condensation abilities suggests that there is a competition between the ethanol dehydration to diethyl ether and acetaldehyde condensation on Lewis acids. Upon the introduction of Pd, the Lewis acidity also dominates the particle size of Pd and then the dehydrogenation and hydrogenating abilities of catalysts.

Role of dactinomycin in the improved survival of children with Wilms' tumor

JAMA ◽  
1966 ◽  
Vol 195 (12) ◽  
pp. 1005-1009 ◽  
Author(s):  
D. J. Fernbach
Keyword(s):  
Wilms Tumor

Role of the allergist in diagnosis and management of patients with uveitis

JAMA ◽  
1966 ◽  
Vol 195 (3) ◽  
pp. 167-172 ◽  
Author(s):  
T. E. Van Metre
Keyword(s):  
Diagnosis And Management
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