scholarly journals Ru/g-C3N4 as an efficient catalyst for selective hydrogenation of aromatic diamines to alicyclic diamines

RSC Advances ◽  
2020 ◽  
Vol 10 (28) ◽  
pp. 16515-16525
Author(s):  
Junya Cao ◽  
Fenggang Han ◽  
Liguo Wang ◽  
Xiaoyu Huang ◽  
Yan Cao ◽  
...  
Keyword(s):  
Selective Hydrogenation ◽  
Carbon Nitride ◽  
Impregnation Method ◽  
Aromatic Diamines ◽  
Efficient Catalyst ◽  
Highly Dispersed

A series of Ru/g-C3N4 materials with highly dispersed Ru were firstly prepared by an ultrasonic impregnation method using carbon nitride as a support.

scholarly journals Supported Bimetallic AuPd Nanoparticles as Catalyst for the Solvent-Free Selective Hydrogenation of Nitroarenes

2018 ◽  
Author(s):  
Ruiyang Qu ◽  
Margherita Macino ◽  
Sarwat Iqbal ◽  
Xiang Gao ◽  
Qian He ◽  
...  
Keyword(s):  
Activation Energy ◽  
Reaction Temperature ◽  
Selective Hydrogenation ◽  
Energy Input ◽  
Solvent Free ◽  
Impregnation Method ◽  
Efficient Catalyst ◽  
Effective Catalyst ◽  
Chemoselective Hydrogenation ◽  
Solvent Free Conditions

Selective hydrogenation of nitrobenzene was carried out under solvent-free conditions using supported AuPd nanoparticles catalyst, prepared by modified impregnation method (MIm), as efficient catalyst. >99% yield of aniline (AN) was obtained after 15 hours at 90 °C, 3 bar H2 that can be used without any further purification or separation, therefore reducing cost and energy input. Supported AuPd nanoparticles catalyst, prepared by MIm, was found to be active and stable even after 4 recycle experiments whereas the same catalyst prepared by SIm deactivated during the recycle experiments. The most effective catalyst was tested for the chemoselective hydrogenation of 4-chloronitrobenzene (CNB) to 4-chloroaniline (CAN). The activation energy of CNB to CAN was found to be 25 kJ mol-1, while that of CNB to AN was found to be 31 kJ mol-1. Based on this, the yield of CAN was maximized (92%) by lowering the reaction temperature to 25 °C.

scholarly journals Supported Bimetallic AuPd Nanoparticles as a Catalyst for the Selective Hydrogenation of Nitroarenes

Nanomaterials ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 690 ◽  
Author(s):  
Ruiyang Qu ◽  
Margherita Macino ◽  
Sarwat Iqbal ◽  
Xiang Gao ◽  
Qian He ◽  
...  
Keyword(s):  
Activation Energy ◽  
Reaction Temperature ◽  
Selective Hydrogenation ◽  
Energy Input ◽  
Solvent Free ◽  
Impregnation Method ◽  
Efficient Catalyst ◽  
Effective Catalyst ◽  
Chemoselective Hydrogenation

The solvent-free selective hydrogenation of nitrobenzene was carried out using a supported AuPd nanoparticles catalyst, prepared by the modified impregnation method (MIm), as efficient catalyst >99% yield of aniline (AN) was obtained after 15 h at 90 °C, 3 bar H2 that can be used without any further purification or separation, therefore reducing cost and energy input. Supported AuPd nanoparticles catalyst, prepared by MIm, was found to be active and stable even after four recycle experiments, whereas the same catalyst prepared by SIm was deactivated during the recycle experiments. The most effective catalyst was tested for the chemoselective hydrogenation of 4-chloronitrobenzene (CNB) to 4-chloroaniline (CAN). The activation energy of CNB to CAN was found to be 25 kJ mol−1, while that of CNB to AN was found to be 31 kJ mol−1. Based on this, the yield of CAN was maximized (92%) by the lowering the reaction temperature to 25 °C.

scholarly journals Tungsten Oxide-Modified SSZ-13 Zeolite as an Efficient Catalyst for Ethylene-To-Propylene Reaction

Catalysts ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 553
Author(s):  
Mansurbek Urol ugli Abdullaev ◽  
Sungjune Lee ◽  
Tae-Wan Kim ◽  
Chul-Ung Kim
Keyword(s):  
Tungsten Oxide ◽  
Fixed Bed ◽  
Acid Sites ◽  
Fixed Bed Reactor ◽  
Incipient Wetness Impregnation ◽  
Impregnation Method ◽  
Efficient Catalyst ◽  
X Ray ◽  
Propylene Selectivity ◽  
Temperature Programmed

Among the zeolitic catalysts for the ethylene-to-propylene (ETP) reaction, the SSZ-13 zeolite shows the highest catalytic activity based on both its suitable pore architecture and tunable acidity. In this study, in order to improve the propylene selectivity further, the surface of the SSZ-13 zeolite was modified with various amounts of tungsten oxide ranging from 1 wt% to 15 wt% via a simple incipient wetness impregnation method. The prepared catalysts were characterized with several analysis techniques, specifically, powder X-ray diffraction (PXRD), Raman spectroscopy, temperature-programmed reduction of hydrogen (H2-TPR), temperature-programmed desorption of ammonia (NH3-TPD), inductively coupled plasma-atomic emission spectroscopy (ICP-AES), and N2 sorption, and their catalytic activities were investigated in a fixed-bed reactor system. The tungsten oxide-modified SSZ-13 catalysts demonstrated significantly improved propylene selectivity and yield compared to the parent H-SSZ-13 catalyst. For the tungsten oxide loading, 10 wt% loading showed the highest propylene yield of 64.9 wt%, which was 6.5 wt% higher than the pristine H-SSZ-13 catalyst. This can be related to not only the milder and decreased strong acid sites but also the diffusion restriction of bulky byproducts, as supported by scanning transmission electron microscopy-energy dispersive X-ray spectroscopy (STEM-EDS) observation.

Highly dispersed rhodium atoms supported on defect-rich Co(OH)2 for chemoselective hydrogenation of nitroarenes

2021 ◽  
Author(s):  
Huan Fu ◽  
Huan Zhang ◽  
Guichun Yang ◽  
Jun Liu ◽  
Junyuan Xu ◽  
...  
Keyword(s):  
Selective Hydrogenation ◽  
Chemoselective Hydrogenation ◽  
Highly Dispersed

The 0.54%(Pt, Rh, Pd or Ru)/Co(OH)2, 1.23%Rh/Co(OH)2 catalysts were successfully synthesized by simple hydrothermal and precipitation methods for nitroarenes selective hydrogenation, it was found that 0.54%Rh/Co(OH)2 outperformed other catalysts, for...

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