scholarly journals Rhodium-Platinum Oxide as a Catalyst for Hydrogenation. III. The Catalytic Hydrogenation of Aniline

1963 ◽  
Vol 36 (7) ◽  
pp. 873-875 ◽  
Author(s):  
Shigeo Nishimura ◽  
Hisaaki Taguchi
Keyword(s):  
Catalytic Hydrogenation ◽  
Platinum Oxide

Elaeocarpus Alkaloids. V. The Alkaloids of Elaeocarpus kaniensis

1972 ◽  
Vol 25 (4) ◽  
pp. 817 ◽  
Author(s):  
N Hart ◽  
S Johns ◽  
J Lamberton
Keyword(s):  
Catalytic Hydrogenation ◽  
Complex Mixture ◽  
Platinum Oxide ◽  
Major Product ◽  
Spectroscopic Methods ◽  
Spectroscopic Evidence ◽  
D 12 ◽  
Absolute Stereochemistry ◽  
Leaf Alkaloids

The leaf alkaloids of Elaeocarpus kalziensis Schltr. are a complex mixture, from which eight new alkaloids have been separated. Spectroscopic evidence has shown that these alkaloids are a closely interrelated group of indolizidines and structures have been assigned to elaeokanine A (1), elaeokanine B (8), elaeokanine C (10), elaeokanine D (12), elaeokanine E (17), and elaeokanidine A (18), Elaeokanidine B and elaeokanidine C are stereoisomers of elaeokanidine A, but the spectroscopic evidence is insufficient for the structures of these alkaloids to be assigned unequivocally. The assigned structures in all cases indicate relative and not absolute stereochemistry. The structures established for elaeokanine A, elaeokanine B, and elaeokanine C by spectroscopic methods have been confirmed by synthesis. Catalytic hydrogenation of synthetic 8-n-butyryl-7-oxoindolizidine (22) over platinum oxide in ethanol afforded (�)elaeokanine C in 30% yield. Under these hydrogenation conditions a major product was 8-n-butyryl-7-oxo-8,9-dehydroindolizidine (23) formed by loss of hydrogen from (22).

Nanometer Scale Spectroscopic Visualization of Catalytic Sites During a Hydrogenation Reaction on a Pd/Au Bimetallic Catalyst

2020 ◽  
Author(s):  
hao yin ◽  
Liqing Zheng ◽  
Wei Fang ◽  
Yin-Hung Lai ◽  
Nikolaus Porenta ◽  
...  
Keyword(s):  
Catalytic Hydrogenation ◽  
Density Functional ◽  
Hydrogen Transfer ◽  
Bimetallic Catalyst ◽  
Local Environment ◽  
Hydrogenation Reaction ◽  
Boundary Density ◽  
Catalytic Sites ◽  
Powerful Analytical Tool ◽  
Tip Enhanced Raman Spectroscopy

<p>Understanding the mechanism of catalytic hydrogenation at the local environment requires chemical and topographic information involving catalytic sites, active hydrogen species and their spatial distribution. Here, tip-enhanced Raman spectroscopy (TERS) was employed to study the catalytic hydrogenation of chloro-nitrobenzenethiol on a well-defined Pd(sub-monolayer)/Au(111) bimetallic catalyst (<i>p</i><sub>H2</sub>=1.5 bar, 298 K), where the surface topography and chemical fingerprint information were simultaneously mapped with nanoscale resolution (≈10 nm). TERS imaging of the surface after catalytic hydrogenation confirms that the reaction occurs beyond the location of Pd sites. The results demonstrate that hydrogen spillover accelerates hydrogenation at the Au sites within 20 nm from the bimetallic Pd/Au boundary. Density functional theory was used to elucidate the thermodynamics of interfacial hydrogen transfer. We demonstrate that TERS as a powerful analytical tool provides a unique approach to spatially investigate the local structure-reactivity relationship in catalysis.</p>

Nanometer Scale Spectroscopic Visualization of Catalytic Sites During a Hydrogenation Reaction on a Pd/Au Bimetallic Catalyst

2020 ◽  
Author(s):  
Hao Yin ◽  
Liqing Zheng ◽  
Wei Fang ◽  
Yin-Hung Lai ◽  
Nikolaus Porenta ◽  
...  
Keyword(s):  
Catalytic Hydrogenation ◽  
Density Functional ◽  
Hydrogen Transfer ◽  
Bimetallic Catalyst ◽  
Local Environment ◽  
Hydrogenation Reaction ◽  
Boundary Density ◽  
Catalytic Sites ◽  
Powerful Analytical Tool ◽  
Tip Enhanced Raman Spectroscopy

<p>Understanding the mechanism of catalytic hydrogenation at the local environment requires chemical and topographic information involving catalytic sites, active hydrogen species and their spatial distribution. Here, tip-enhanced Raman spectroscopy (TERS) was employed to study the catalytic hydrogenation of chloro-nitrobenzenethiol on a well-defined Pd(sub-monolayer)/Au(111) bimetallic catalyst (<i>p</i><sub>H2</sub>=1.5 bar, 298 K), where the surface topography and chemical fingerprint information were simultaneously mapped with nanoscale resolution (≈10 nm). TERS imaging of the surface after catalytic hydrogenation confirms that the reaction occurs beyond the location of Pd sites. The results demonstrate that hydrogen spillover accelerates hydrogenation at the Au sites within 20 nm from the bimetallic Pd/Au boundary. Density functional theory was used to elucidate the thermodynamics of interfacial hydrogen transfer. We demonstrate that TERS as a powerful analytical tool provides a unique approach to spatially investigate the local structure-reactivity relationship in catalysis.</p>

Catalytic Hydrogenation of Carbon Dioxide to Fuels

2014 ◽  
Vol 18 (10) ◽  
pp. 1335-1345 ◽  
Author(s):  
Xuecheng Yan ◽  
Han Guo ◽  
Dongjiang Yang ◽  
Shilun Qiu ◽  
Xiangdong Yao
Keyword(s):  
Carbon Dioxide ◽  
Catalytic Hydrogenation ◽  
Hydrogenation Of Carbon Dioxide
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