Selective transformation of hemicellulose (xylan) into n-pentane, pentanols or xylitol over a rhenium-modified iridium catalyst combined with acids

2016 ◽  
Vol 18 (1) ◽  
pp. 165-175 ◽  
Author(s):  
Sibao Liu ◽  
Yasuyo Okuyama ◽  
Masazumi Tamura ◽  
Yoshinao Nakagawa ◽  
Akio Imai ◽  
...  
Keyword(s):  
Selective Transformation ◽  
Iridium Catalyst

n-Pentane (yield 70%), pentanols (32%) or xylitol (79%) can be produced from xylan by using an Ir–ReOx/SiO2 catalyst combined with acids.

Pt-Pd Nanoalloy for the Unprecedented Activation of Carbon-Fluorine Bond at Low Temperature

2019 ◽  
Author(s):  
Raghu Nath Dhital ◽  
keigo nomura ◽  
Yoshinori Sato ◽  
Setsiri Haesuwannakij ◽  
Masahiro Ehara ◽  
...  
Keyword(s):  
Activation Energy ◽  
Low Temperature ◽  
Dft Calculations ◽  
Bond Activation ◽  
Mild Conditions ◽  
Selective Transformation ◽  
Rate Determining Step ◽  
Highly Active ◽  
Harsh Conditions ◽  
Reaction Profile

Carbon-Fluorine (C-F) bonds are considered the most inert organic functionality and their selective transformation under mild conditions remains challenging. Herein, we report a highly active Pt-Pd nanoalloy as a robust catalyst for the transformation of C-F bonds into C-H bonds at low temperature, a reaction that often required harsh conditions. The alloying of Pt with Pd is crucial to activate C-F bond. The reaction profile kinetics revealed that the major source of hydrogen in the defluorinated product is the alcoholic proton of 2-propanol, and the rate-determining step is the reduction of the metal upon transfer of the <i>beta</i>-H from 2-propanol. DFT calculations elucidated that the key step is the selective oxidative addition of the O-H bond of 2-propanol to a Pd center prior to C-F bond activation at a Pt site, which crucially reduces the activation energy of the C-F bond. Therefore, both Pt and Pd work independently but synergistically to promote the overall reaction

Hydrogen production from cellulose catalyzed by an iridium complex in ionic liquid under mild conditions

2021 ◽  
Author(s):  
Genki Toyooka ◽  
Toshiki Tanaka ◽  
Kenji Kitayama ◽  
Naoko Kobayashi ◽  
Takashi Watanabe ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Hydrogen Production ◽  
Iridium Complex ◽  
Simple Method ◽  
Mild Conditions ◽  
Iridium Catalyst

A new and simple method for hydrogen production from cellulose using an iridium catalyst and an ionic liquid under mild conditions was developed.

Iridium-Catalyst-Based Autonomous Bubble-Propelled Graphene Micromotors with Ultralow Catalyst Loading

2014 ◽  
Vol 20 (46) ◽  
pp. 14946-14950 ◽  
Author(s):  
Hong Wang ◽  
Zdeněk Sofer ◽  
Alex Yong Sheng Eng ◽  
Martin Pumera
Keyword(s):  
Catalyst Loading ◽  
Iridium Catalyst

A new efficient chiral iridium catalyst for asymmetric transfer hydrogenation of ketones

2004 ◽  
Vol 218 (2) ◽  
pp. 153-156 ◽  
Author(s):  
Yan-Yun Li ◽  
Hui Zhang ◽  
Jian-Shan Chen ◽  
Xin-Li Liao ◽  
Zhen-Rong Dong ◽  
...  
Keyword(s):  
Transfer Hydrogenation ◽  
Asymmetric Transfer Hydrogenation ◽  
Iridium Catalyst

Caged iridium catalyst for hydrosilylation of alkynes with high site selectivity

ChemCatChem ◽  
2022 ◽  
Author(s):  
Qiaosheng Li ◽  
Defa Gu ◽  
Dongdong Yu ◽  
Yuzhou Liu
Keyword(s):  
Iridium Catalyst ◽  
Site Selectivity ◽  
High Site
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