scholarly journals Iridium(NHC)-Catalyzed Sustainable Transfer Hydrogenation of CO2 and Inorganic Carbonates

Catalysts ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 695
Author(s):  
Yeon-Joo Cheong ◽  
Kihyuk Sung ◽  
Jin-A Kim ◽  
Yu Kwon Kim ◽  
Woojin Yoon ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
High Temperature ◽  
Carbon Sources ◽  
Transfer Hydrogenation ◽  
Suitable Choice ◽  
Iridium Catalysts ◽  
Hydrogenation Of Co2

Iridium(NHC)-catalyzed transfer hydrogenation (TH) of CO2 and inorganic carbonates with glycerol were conducted, demonstrating excellent turnover numbers (TONs) and turnover frequencies (TOFs) for the formation of formate and lactate. Regardless of carbon sources, excellent TOFs of formate were observed (CO2: 10,000 h−1 and K2CO3: 10,150 h−1). Iridium catalysts modified with the triscarbene ligand showed excellent catalytic activity at 200 °C and are a suitable choice for this transformation which requires a high temperature for high TONs of formate. On the basis of the control experiments, the transfer hydrogenation mechanism of CO2 was proposed.

scholarly journals Transfer hydrogenation of benzaldehyde over embedded copper nanoparticles

2021 ◽  
Vol 24 (1) ◽  
pp. 1847-1853
Author(s):  
Thanh Thien Co
Keyword(s):  
Catalytic Activity ◽  
High Temperature ◽  
Copper Nanoparticles ◽  
Industrial Application ◽  
Copper Catalyst ◽  
Transfer Hydrogenation ◽  
High Concentration ◽  
High Temperature And Pressure ◽  
Temperature And Pressure ◽  
Dangerous Condition

Transfer hydrogenation is one of the reactions of high industrial application and copper catalyst is widely used in variety of hydrgenated substrates. Unfortunately, these hydrogenated processes were usually performed at high temperature and pressure as well as high concentration of catalyst. In this study, we have tried to reduce the dangerous condition by using copper nanoparticles as catalyst and the catalytic activity will be evaluated via the transfer hydrogenation of benzaldehyde. Besides, copper nanoparticles were successful prepared by the reduction between CuSO4.5H2O and NaBH4 in the presence of PVP. All catalysts were fully characterized.

From Ru nanoparticle-encapsulated metal–organic frameworks to highly catalytically active Cu/Ru nanoparticle-embedded porous carbon

2017 ◽  
Vol 5 (10) ◽  
pp. 4835-4841 ◽  
Author(s):  
Pradip Pachfule ◽  
Xinchun Yang ◽  
Qi-Long Zhu ◽  
Nobuko Tsumori ◽  
Takeyuki Uchida ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
High Temperature ◽  
Porous Carbon ◽  
Metal Organic Frameworks ◽  
Ammonia Borane ◽  
Carbon Composites ◽  
High Catalytic Activity ◽  
Catalytically Active ◽  
Metal Organic

High-temperature pyrolysis of Ru nanoparticle-encapsulated MOF (Ru@HKUST-1) afforded ultrafine Cu/Ru nanoparticle-embedded porous carbon composites (Cu/Ru@C), which show high catalytic activity for ammonia borane hydrolysis.

A Family of Active Iridium Catalysts for Transfer Hydrogenation of Ketones

2006 ◽  
Vol 25 (17) ◽  
pp. 4113-4117 ◽  
Author(s):  
Zaheer E. Clarke ◽  
Paul T. Maragh ◽  
Tara P. Dasgupta ◽  
Dmitry G. Gusev ◽  
Alan J. Lough ◽  
...  
Keyword(s):  
Transfer Hydrogenation ◽  
Iridium Catalysts

scholarly journals A Family of Active Iridium Catalysts for Transfer Hydrogenation of Ketones.

ChemInform ◽  
2006 ◽  
Vol 37 (50) ◽  
Author(s):  
Zaheer E. Clarke ◽  
Paul T. Maragh ◽  
Tara P. Dasgupta ◽  
Dmitry G. Gusev ◽  
Alan J. Lough ◽  
...  
Keyword(s):  
Transfer Hydrogenation ◽  
Iridium Catalysts

scholarly journals Source of 12C in Calvin–Benson cycle intermediates and isoprene emitted from plant leaves fed with 13CO2

2020 ◽  
Vol 477 (17) ◽  
pp. 3237-3252 ◽  
Author(s):  
Thomas D. Sharkey ◽  
Alyssa L. Preiser ◽  
Sarathi M. Weraduwage ◽  
Linus Gog
Keyword(s):  
High Temperature ◽  
Carbon Sources ◽  
Plant Leaves ◽  
Isoprene Emission ◽  
Variable Contribution ◽  
Terpene Synthesis ◽  
Glucose 6 Phosphate Dehydrogenase

Feeding 14CO2 was crucial to uncovering the path of carbon in photosynthesis. Feeding 13CO2 to photosynthesizing leaves emitting isoprene has been used to develop hypotheses about the sources of carbon for the methylerythritol 4-phosphate pathway, which makes the precursors for terpene synthesis in chloroplasts and bacteria. Both photosynthesis and isoprene studies found that products label very quickly (<10 min) up to 80–90% but the last 10–20% of labeling requires hours indicating a source of 12C during photosynthesis and isoprene emission. Furthermore, studies with isoprene showed that the proportion of slow label could vary significantly. This was interpreted as a variable contribution of carbon from sources other than the Calvin–Benson cycle (CBC) feeding the methylerythritol 4-phosphate pathway. Here, we measured the degree of label in isoprene and photosynthetic metabolites 20 min after beginning to feed 13CO2. Isoprene labeling was the same as labeling of photosynthesis intermediates. High temperature reduced the label in isoprene and photosynthesis intermediates by the same amount indicating no role for alternative carbon sources for isoprene. A model assuming glucose, fructose, and/or sucrose reenters the CBC as ribulose 5-phosphate through a cytosolic shunt involving glucose 6-phosphate dehydrogenase was consistent with the observations.

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