scholarly journals Catalytic properties of nanocarbon materials in reaction of selective hydrogenation of acetylene

2021 ◽  
pp. 280-295
Author(s):  
Igor B. Bychko ◽  
◽  
Alexander A. Abakumov ◽  
Andrii I. Trypolskyi ◽  
Peter E. Strizhak ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Selective Hydrogenation ◽  
Noble Metals ◽  
Carbon Nanomaterials ◽  
Catalytic Properties ◽  
Hydrogenation Reaction ◽  
Gas Phases ◽  
Selective Hydrogenation Of Acetylene ◽  
Nanocarbon Materials ◽  
Hydrogenation Reactions

The chapter presents the results of studies of the catalytic properties of nanocarbon materials based on carbon nanotubes and reduced graphene oxide in the hydrogenation of ethylene, acetylene and ethylene-acetylene mixture by molecular hydrogen at atmosphere pressure. The current state of scientific approaches to the creation of nanocarbon metal-free catalysts for the hydrogenation reactions in both liquid and gas phases is presented. A possible nature of active center of the hydrogenation reaction located on the surface of the nanocarbon material is discussed. It is shown that the catalytic activity of the nanocarbon materials is not associated with metal impurities. The correlation between the structural characteristics of carbon nanomaterials and their catalytic properties in the hydrogenation reactions of unsaturated hydrocarbons is demonstrated. A comparative analysis of the catalytic activity of nanocarbon materials and catalysts that contain noble metals in the hydrogenation reaction of acetylene is presented. Finally, the fundamental possibility of creating a nanocarbon catalyst for selective hydrogenation of acetylene in excess ethylene is shown.

scholarly journals Palladium nanoparticles supported on nitrogen doped porous carbon material derived from cyclodextrin, glucose and melamine based polymer: promising catalysts for hydrogenation reactions

2020 ◽  
Vol 92 (6) ◽  
pp. 827-837 ◽  
Author(s):  
Samahe Sadjadi ◽  
Masoumeh Malmir ◽  
Bastien Léger ◽  
Eric Monflier ◽  
Majid M. Heravi
Keyword(s):  
Catalytic Activity ◽  
Palladium Nanoparticles ◽  
Aqueous Media ◽  
Hydrogenation Reaction ◽  
Molar Ratio ◽  
Porous Carbon Material ◽  
High Catalytic Activity ◽  
Hydrothermal Conditions ◽  
Nitrogen Doped ◽  
Hydrogenation Reactions

AbstractMelamine based polymer (MT) was prepared and then reacted with a mixture of glucose (Glu) and β-cyclodextrin (CD) under hydrothermal conditions to afford, MT/Glu-CD. Then, the adsorption of Pd salt was realized on MT/Glu-CD. The resulting compound was subsequently carbonized to furnish Pd/MT/C that exhibited high catalytic activity for the hydrogenation of nitroarenes in aqueous media. To elucidate the roles of CD, Glu, the molar ratio of Glu:CD and the carbonization in the catalytic activity, several control catalysts have been prepared and their performances for a model hydrogenation reaction were compared with that of Pd/MT/C. The results confirmed the importance of the carbonization as well as the presence of CD for achieving high catalytic activity. Moreover, it was found that the molar ratio of Glu:CD could affect the catalytic activity of the final catalyst and the optimum molar ratio of Glu:CD was 30:70. The recycling test as well as measurement of Pd leaching demonstrated high recyclability and low Pd leaching of Pd/MT/C.

scholarly journals Highly Enhanced Catalytic Stability of Copper by the Synergistic Effect of Porous Hierarchy and Alloying for Selective Hydrogenation Reaction

Catalysts ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 12
Author(s):  
Hao Yuan ◽  
Zhao Wang ◽  
Shunjing Jin ◽  
Shanshan Xiao ◽  
Siming Liu ◽  
...  
Keyword(s):  
Selective Hydrogenation ◽  
Porous Alumina ◽  
Hydrogenation Reaction ◽  
Copper Surface ◽  
Hierarchically Porous ◽  
In Situ Activation ◽  
Hydrogenation Reactions ◽  
Hydrolysis Of Metal Alkoxides ◽  
Catalytic Stability ◽  
Cu Catalysts

Supported copper has a great potential for replacing the commercial palladium-based catalysts in the field of selective alkynes/alkadienes hydrogenation due to its excellent alkene selectivity and relatively high activity. However, fatally, it has a low catalytic stability owing to the rapid oligomerization of alkenes on the copper surface. In this study, 2.5 wt% Cu catalysts with various Cu:Zn ratios and supported on hierarchically porous alumina (HA) were designed and synthesized by deposition–precipitation with urea. Macropores (with diameters of 1 μm) and mesopores (with diameters of 3.5 nm) were introduced by the hydrolysis of metal alkoxides. After in situ activation at 350 °C, the catalytic stability of Cu was highly enhanced, with a limited effect on the catalytic activity and alkene selectivity. The time needed for losing 10% butadiene conversion for Cu1Zn3/HA was ~40 h, which is 20 times higher than that found for Cu/HA (~2 h), and 160 times higher than that found for Cu/bulky alumina (0.25 h). It was found that this type of enhancement in catalytic stability was mainly due to the rapid mass transportation in hierarchically porous structure (i.e., four times higher than that in bulky commercial alumina) and the well-dispersed copper active site modified by Zn, with identification by STEM–HAADF coupled with EDX. This study offers a universal way to optimize the catalytic stability of selective hydrogenation reactions.

Effect of carbon nanosheets with different graphitization degrees as a support of noble metals on selective hydrogenation of cinnamaldehyde

RSC Advances ◽  
2016 ◽  
Vol 6 (100) ◽  
pp. 98356-98364 ◽  
Author(s):  
Qing Han ◽  
Yunfei Liu ◽  
Dong Wang ◽  
Fulong Yuan ◽  
Xiaoyu Niu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Selective Hydrogenation ◽  
Noble Metals ◽  
Carbon Nanosheets

Effect of carbon nanosheets with different graphitization degrees on the catalytic activity of Pt/CNS and Pd/CNS was investigated in selective hydrogenation of cinnamaldehyde.

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