Cobalt Carbide Nanocatalysts for Efficient Syngas Conversion to Value-Added Chemicals with High Selectivity

2021 ◽  
Vol 54 (8) ◽  
pp. 1961-1971
Author(s):  
Tiejun Lin ◽  
Fei Yu ◽  
Yunlei An ◽  
Tingting Qin ◽  
Liusha Li ◽  
...  
Keyword(s):  
High Selectivity ◽  
Value Added ◽  
Syngas Conversion ◽  
Cobalt Carbide

scholarly journals Production of value-added chemicals from esterification of waste glycerol over MCM-41 supported catalysts

2019 ◽  
Vol 8 (1) ◽  
pp. 128-134 ◽  
Author(s):  
Emine Kaya Ekinci ◽  
Nuray Oktar
Keyword(s):  
Acetic Acid ◽  
High Selectivity ◽  
Supported Catalysts ◽  
Value Added ◽  
Mass Spectrometry Analysis ◽  
Molar Ratio ◽  
Esterification Reaction ◽  
Glycerol Conversion ◽  
Spectrometry Analysis ◽  
Mcm 41

Abstract A series of active and selective MCM-41 supported catalysts have been successfully prepared and used for bioderived glycerol esterification with acetic acid to produce fuel additives. In the synthesis of MCM-41, an acidic hydrothermal synthesis route was used, and silicotungstic acid (STA) and zirconia (ZrO2) were added to the catalyst structure by wet impregnation. X-ray diffraction, nitrogen adsorption-desorption methods, scanning electron microscopy with energy-dispersive spectroscopy, and inductively coupled plasma-mass spectrometry analysis were used for characterizations of the catalysts. Diffuse reflectance infrared Fourier transform spectroscopy analyses of pyridine-adsorbed catalysts owns Lewis and Brønsted acidity hosting in one, which promotes the esterification reaction of glycerol into glycerol esters with high selectivity. Esterification of glycerol reactions were performed at temperature intervals of 105°C–200°C, with an amount of catalyst equal to 0.5 g, and glycerol/acetic acid molar ratio of 1:6 in a stirred autoclave reactor operated batchwise. STA and ZrO2-impregnated MCM-41 catalysts showed better performance with a complete glycerol conversion and high selectivity to triacetin.

Advances in direct production of value-added chemicals via syngas conversion

2017 ◽  
Vol 60 (7) ◽  
pp. 887-903 ◽  
Author(s):  
Yunlei An ◽  
Tiejun Lin ◽  
Fei Yu ◽  
Yanzhang Yang ◽  
Liangshu Zhong ◽  
...  
Keyword(s):  
Value Added ◽  
Direct Production ◽  
Syngas Conversion

scholarly journals Synthesis and Characterization of SiO2Nanoparticles and Their Efficacy in Chemical Mechanical Polishing Steel Substrate

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
M. J. Kao ◽  
F. C. Hsu ◽  
D. X. Peng
Keyword(s):  
Chemical Mechanical Polishing ◽  
High Selectivity ◽  
Steel Substrate ◽  
Sol Gel ◽  
Aerospace Industry ◽  
Value Added ◽  
Mechanical Polishing ◽  
Reaction Conditions ◽  
Abrasive Size

Chemical mechanical polishing (CMP) technology is extensively used in the global planarization of highly value-added and large components in the aerospace industry. A nanopowder of SiO2was prepared by the sol-gel method and was compounded into polishing slurry for the CMP of steel substrate. The size of the SiO2abrasives was controlled by varying the sol-gel reaction conditions. The polishing efficacy of nano-SiO2was studied, and the CMP mechanism with nanosized abrasives was further investigated. The proposed methods can produce SiO2abrasives whose size can be controlled by varying the sol-gel reaction conditions. The size of the SiO2abrasives was controlled in the range from 58 to 684 nm. The roughness of the steel substrate strongly depends on the size of the abrasive, and the surface roughness decreases as the abrasive size declines. A super-smooth surface with a roughness of 8.4 nm is obtained with nanosized SiO2. Ideal CMP slurry can be used to produce material surfaces with low roughness, excellent global planarization, high selectivity, an excellent finish, and a low-defected rate.

Quadruple metal-based layered structure as the photocatalyst for conversion of carbon dioxide into a value added carbon monoxide with high selectivity and efficiency

2017 ◽  
Vol 5 (18) ◽  
pp. 8274-8279 ◽  
Author(s):  
Keon-Han Kim ◽  
Sangjun Kim ◽  
Byeong Cheul Moon ◽  
Jae Won Choi ◽  
Hyung Mo Jeong ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Carbon Monoxide ◽  
Layered Structure ◽  
High Selectivity ◽  
Value Added ◽  
A Value

We report the quadruple metals-based layered structure giving a high selectivity close to 100% and a significantly improved efficiency for photocatalytic conversion of CO2 to CO compared to bi or tri metals-based layered ones.

The influence of alkali-treated zeolite on the oxide–zeolite syngas conversion process

2018 ◽  
Vol 8 (17) ◽  
pp. 4338-4348 ◽  
Author(s):  
Xiaoli Yang ◽  
Xiong Su ◽  
Binglian Liang ◽  
Yaru Zhang ◽  
Hongmin Duan ◽  
...  
Keyword(s):  
High Selectivity ◽  
Conversion Process ◽  
Syngas Conversion

The oxide–zeolite process has been attracting widespread attention due to its promising performance in syngas conversion to hydrocarbons with high selectivity and stability.

One-pot producing diethyl maleate via catalytic conversion of raw lignocellulosic biomass

2021 ◽  
Author(s):  
Zhenping Cai ◽  
Rujia Chen ◽  
Hao Zhang ◽  
Fukun Li ◽  
Jinxing Long ◽  
...  
Keyword(s):  
Lignocellulosic Biomass ◽  
High Selectivity ◽  
Value Added ◽  
Catalytic Conversion ◽  
Diethyl Maleate ◽  
One Pot ◽  
A Value ◽  
Biomass Components

Conversion of lignocellulose into a value-added chemical with high selectivity is of great significance but a big challenge due to the structural diversities of biomass components. Here, we reported an...

scholarly journals Highly Selective Oxidation of 5-Hydroxymethylfurfural to 5-Hydroxymethyl-2-Furancarboxylic Acid by a Robust Whole-Cell Biocatalyst

Catalysts ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 526 ◽  
Author(s):  
Ran Cang ◽  
Li-Qun Shen ◽  
Guang Yang ◽  
Zhi-Dong Zhang ◽  
He Huang ◽  
...  
Keyword(s):  
Selective Oxidation ◽  
High Selectivity ◽  
Value Added ◽  
Catalytic Performance ◽  
Resting Cells ◽  
Fed Batch ◽  
Reaction Conditions ◽  
Whole Cell Biocatalyst ◽  
Radiation Resistant ◽  
First Time

Value-added utilization of biomass-derived 5-hydroxymethylfurfural (HMF) to produce useful derivatives is of great interest. In this work, extremely radiation resistant Deinococcus wulumuqiensis R12 was explored for the first time as a new robust biocatalyst for selective oxidation of HMF to 5-hydroxymethylfuroic acid (HMFCA). Its resting cells exhibited excellent catalytic performance in a broad range of pH and temperature values, and extremely high tolerance to HMF and the HMFCA product. An excellent yield of HMFCA (up to 90%) was achieved when the substrate concentration was set to 300 mM under the optimized reaction conditions. In addition, 511 mM of product was obtained within 20 h by employing a fed-batch strategy, affording a productivity of 44 g/L per day. Of significant synthetic interest was the finding that the D. wulumuqiensis R12 cells were able to catalyze the selective oxidation of other structurally diverse aldehydes to their corresponding acids with good yield and high selectivity, indicating broad substrate scope and potential widespread applications in biotechnology and organic chemistry.

scholarly journals Conversion of Glycerol to Value Added Products in a Semi-Continuous Batch Reactor Using Noble Metals Supported on ZSM-11 Zeolite

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 510
Author(s):  
Eliana Diguilio ◽  
María S. Renzini ◽  
Liliana B. Pierella ◽  
Marcelo E. Domine
Keyword(s):  
Noble Metals ◽  
High Selectivity ◽  
Batch Reactor ◽  
Value Added ◽  
Main Reaction ◽  
Reaction Conditions ◽  
Wet Impregnation ◽  
Acidic Sites ◽  
Microporous Zeolite ◽  
Value Added Products

Au, Pt, and Pd supported on ZSM-11 microporous zeolite were investigated as catalysts for glycerol (GLY) oxidation towards higher value added products. ZSM-11 was synthesized by hydrothermal treatment. Subsequently, ion exchange with NH4Cl was performed to recover acidic sites and then, Au, Pt, and Pd were incorporated onto this material by wet impregnation procedure. After thermal treatment of desorption and calcination, the corresponding Au, Pt, and Pd-ZSM-11 catalysts were obtained. These materials were characterized by different techniques, such as XRD, ICP, TEM- XEDS, and XPS, and were evaluated in the glycerol oxidation reaction by using alkaline medium and molecular oxygen as oxidizing agent. The higher conversion of GLY (66.5 mol.%) was reached for the Pt–ZSM-11 catalyst with moderate selectivity towards lactic acid (LA), while the bimetallic Au-Pt-ZSM-11 catalyst offered high selectivity to LA at moderate GLY conversion. Optimization of the main reaction parameters (i.e., temperature, reaction time and NaOH/GLY ratio) was carried out to maximize the selectivity towards the LA desired product. Thus, LA selectivity values close to 55% at GLY conversion >65% can be reached by using Pt-ZSM-11 as a catalyst under mild reaction conditions.

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