Sponge-like carbon monoliths: porosity control of 3D-printed carbon supports and its influence on the catalytic performance

2021 ◽  
pp. 134218
Author(s):  
Cristian Chaparro-Garnica ◽  
Esther Bailón-García ◽  
Arantxa Davó-Quiñonero ◽  
Dolores Lozano-Castelló ◽  
Agustín Bueno-López
Keyword(s):  
Catalytic Performance ◽  
Carbon Supports ◽  
3D Printed

scholarly journals Thermal Modification Effect on Supported Cu-Based Activated Carbon Catalyst in Hydrogenolysis of Glycerol

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 603 ◽  
Author(s):  
Juan Seguel ◽  
Rafael García ◽  
Ricardo José Chimentão ◽  
José Luis García-Fierro ◽  
I. Tyrone Ghampson ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Specific Surface ◽  
Hydrogen Adsorption ◽  
Carbon Support ◽  
Catalytic Performance ◽  
Homogeneous Distribution ◽  
Surface Groups ◽  
Carbon Supports ◽  
Surface Areas ◽  
Oxygen Surface

Glycerol hydrogenolysis to 1,2-propanediol (1,2-PDO) was performed over activated carbon supported copper-based catalysts. The catalysts were prepared by impregnation using a pristine carbon support and thermally-treated carbon supports (450, 600, 750, and 1000 °C). The final hydrogen adsorption capacity, porous structure, and total acidity of the catalysts were found to be important descriptors to understand catalytic performance. Oxygen surface groups on the support controlled copper dispersion by modifying acidic and adsorption properties. The amount of oxygen species of thermally modified carbon supports was also found to be a function of its specific surface area. Carbon supports with high specific surface areas contained large amount of oxygen surface species, inducing homogeneous distribution of Cu species on the carbon support during impregnation. The oxygen surface groups likely acted as anchorage centers, whereby the more stable oxygen surface groups after the reduction treatment produced an increase in the interaction of the copper species with the carbon support, and determined catalytic performances.

scholarly journals Cobalt oxide–carbon nanocatalysts with highly enhanced catalytic performance for the green synthesis of nitrogen heterocycles through the Friedländer condensation

2019 ◽  
Vol 48 (17) ◽  
pp. 5637-5648 ◽  
Author(s):  
Marina Godino-Ojer ◽  
Antonio J. López-Peinado ◽  
Francisco J. Maldonado-Hódar ◽  
Esther Bailón-García ◽  
Elena Pérez-Mayoral
Keyword(s):  
Green Synthesis ◽  
Cobalt Oxide ◽  
Nitrogen Heterocycles ◽  
Catalytic Performance ◽  
Carbon Supports ◽  
Highly Efficient ◽  
Coo Nanoparticles

A novel series of eco-sustainable catalysts developed by supporting CoO nanoparticles on different carbon supports, highly efficient in the synthesis of quinolines and naphthyridines, through the Friedländer condensation.

Effect of the graphitic degree of carbon supports on the catalytic performance of ammonia synthesis over Ba-Ru-K/HSGC catalyst

2014 ◽  
Vol 23 (4) ◽  
pp. 443-452 ◽  
Author(s):  
Wei Jiang ◽  
Ying Li ◽  
Wenfeng Han ◽  
Yaping Zhou ◽  
Haodong Tang ◽  
...  
Keyword(s):  
Ammonia Synthesis ◽  
Catalytic Performance ◽  
Carbon Supports

scholarly journals Morphological Control of Carbon-Supported Pt-Based Nanoparticles via One-Step Synthesis

2019 ◽  
Author(s):  
Tatsuichiro Nakamoto
Keyword(s):  
Catalytic Performance ◽  
Growth Direction ◽  
Selective Exposure ◽  
Reduction Reaction ◽  
Carbon Supports ◽  
Step Method ◽  
Half Cell ◽  
Metal Precursors ◽  
One Step ◽  
Polymer Surfactant

The morphology of Pt-based nanoparticles supported on carbon is controlled to enhance the oxygen reduction reaction (ORR) catalytic performance. Herein a simple one-step method without a polymer surfactant is demonstrated to synthesize Pt-Cu nanoclusters, Pt-Cu nanospheres, and Cu-doped Pt nanoplates. Metal precursors are reduced in a NaCl or NH4Cl aqueous solution containing carbon supports, and nanoparticles are directly deposited on carbon. Cl− ions generated from NaCl or NH4Cl behave as oxidative etchants when O2 is dissolved in the synthesis solution, delaying the reduction of metal ions and leading to larger particles. Nanoclusters are obtained in the absence of Cl− ions. In addition, NH4+ guides the growth direction of Pt in the presence of oxidative etchants, forming a plate-like morphology that exposes the {111} facets. Half-cell measurements are performed in acidic media to evaluate the electrochemical properties. Cu-doped Pt nanoplates exhibit a 3.67-times higher ORR catalytic activity than the commercial Pt catalysts thanks to the synergistic effect with a small amount of Cu and selective exposure of the {111} facets. The result suggests that transition metals in Pt-based electrocatalysts may be unnecessary to form intermetallic alloyed crystals for the enhanced ORR performance.

Synthesis of Cr, Cu, Ni, and Y-Doped 3D-Printed ZSM-5 Monoliths and Their Catalytic Performance for n-Hexane Cracking

2018 ◽  
Vol 1 (6) ◽  
pp. 2740-2748 ◽  
Author(s):  
Xin Li ◽  
Abdo-Alslam Alwakwak ◽  
Fateme Rezaei ◽  
Ali A. Rownaghi
Keyword(s):  
Catalytic Performance ◽  
3D Printed

scholarly journals Reversing the charge transfer between platinum and sulfur-doped carbon support for electrocatalytic hydrogen evolution

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Qiang-Qiang Yan ◽  
Dao-Xiong Wu ◽  
Sheng-Qi Chu ◽  
Zhi-Qin Chen ◽  
Yue Lin ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Hydrogen Evolution ◽  
Carbon Support ◽  
Catalytic Performance ◽  
High Mass ◽  
Carbon Supports ◽  
Pt Nanoclusters ◽  
Size Dependent ◽  
Single Atoms ◽  
Metal Support Interaction

Abstract Metal–support interaction is of great significance for catalysis as it can induce charge transfer between metal and support, tame electronic structure of supported metals, impact adsorption energy of reaction intermediates, and eventually change the catalytic performance. Here, we report the metal size-dependent charge transfer reversal, that is, electrons transfer from platinum single atoms to sulfur-doped carbons and the carbon supports conversely donate electrons to Pt when their size is expanded to ~1.5 nm cluster. The electron-enriched Pt nanoclusters are far more active than electron-deficient Pt single atoms for catalyzing hydrogen evolution reaction, exhibiting only 11 mV overpotential at 10 mA cm−2 and a high mass activity of 26.1 A mg−1 at 20 mV, which is 38 times greater than that of commercial Pt/C. Our work manifests that the manipulation of metal size-dependent charge transfer between metal and support opens new avenues for developing high-active catalysts.

Monolithic composites with geometry controlled by polymeric 3D printed templates: characterization and catalytic performance in OCM

2021 ◽  
pp. 149554
Author(s):  
Elżbieta Bogdan ◽  
Barbara Michorczyk ◽  
Anna Rokicińska ◽  
Marcelina Basta ◽  
Mariya Myradova ◽  
...  
Keyword(s):  
Catalytic Performance ◽  
3D Printed

scholarly journals Design of carbon supports for metal-catalyzed acetylene hydrochlorination

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Selina K. Kaiser ◽  
Ivan Surin ◽  
Ana Amorós-Pérez ◽  
Simon Büchele ◽  
Frank Krumeich ◽  
...  
Keyword(s):  
Industrial Process ◽  
Catalytic Performance ◽  
Single Atom ◽  
Catalyst Stability ◽  
Carbon Supports ◽  
Acetylene Hydrochlorination ◽  
Active Metal ◽  
Central Activity ◽  
Metal Nanostructure ◽  
Metal Catalyzed

AbstractFor decades, carbons have been the support of choice in acetylene hydrochlorination, a key industrial process for polyvinyl chloride manufacture. However, no unequivocal design criteria could be established to date, due to the complex interplay between the carbon host and the metal nanostructure. Herein, we disentangle the roles of carbon in determining activity and stability of platinum-, ruthenium-, and gold-based hydrochlorination catalysts and derive descriptors for optimal host design, by systematically varying the porous properties and surface functionalization of carbon, while preserving the active metal sites. The acetylene adsorption capacity is identified as central activity descriptor, while the density of acidic oxygen sites determines the coking tendency and thus catalyst stability. With this understanding, a platinum single-atom catalyst is developed with stable catalytic performance under two-fold accelerated deactivation conditions compared to the state-of-the-art system, marking a step ahead towards sustainable PVC production.

scholarly journals Catalytic Performance of Co3O4 on Different Activated Carbon Supports in the Benzyl Alcohol Oxidation

Catalysts ◽  
2017 ◽  
Vol 7 (12) ◽  
pp. 384 ◽  
Author(s):  
Misael Cordoba ◽  
Cristian Miranda ◽  
Cecilia Lederhos ◽  
Fernando Coloma-Pascual ◽  
Alba Ardila ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Benzyl Alcohol ◽  
Alcohol Oxidation ◽  
Catalytic Performance ◽  
Carbon Supports ◽  
Benzyl Alcohol Oxidation

Effects of pretreated carbon supports in Pd/C catalysts on rosin disproportionation catalytic performance

2020 ◽  
Vol 216 ◽  
pp. 115588
Author(s):  
Yongwan Gu ◽  
Yunyan Li ◽  
Jiaoxia Zhang ◽  
Huiying Zhang ◽  
Chunhua Wu ◽  
...  
Keyword(s):  
Catalytic Performance ◽  
Carbon Supports
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