A new route of CO2 catalytic activation: syntheses of N-substituted carbamates from dialkyl carbonates and polyureas

Shang, Jianpeng; Liu, Shimin; Ma, Xiangyuan; Lu, Lehui; Deng, Yuanfu

doi:10.1039/c2gc36043h

Cited by 97 publications

(96 citation statements)

References 49 publications

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“…For instance, [10]-OU showedt wo definite new peaks at 1615 cm À1 (amide I, C=O; peak C) and at 1570 cm À1 (amide II, CO-NH;p eak B) in comparison to the spectrum of the starting material, as shown in Figure 1. [29] As mall peak at 1691 cm À1 (peak D) relatedt ot he formation of au rethane end group was also detected.…”

Section: Resultsmentioning

confidence: 85%

[n]‐Oligourea‐Based Green Sorbents with Enhanced CO₂ Sorption Capacity

et al. 2015

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A new series of [n]-oligoureas ([n]-OUs, n=4, 7, 10, and 12) green solid sorbents was prepared following a base-catalyzed, microwave-assisted oligomerization reaction. The materials were characterized by NMR and IR spectroscopy, elemental analysis, thermogravimetric analysis, differential scanning calorimetry, and XRD. Decomposition temperatures at 50 % weight loss (Td50 ) were ca. 350 °C for all oligomers. Urea and urethane functional groups indicated by IR spectroscopy confirmed the formation of the sorbent. The CO2 capturing capacities were determined at 35 °C and 1.0 bar (gravimetric method). Accordingly, [10]-OU had the highest CO2 sorption capacity among the others (18.90 and 22.70 mg CO 2 gsorbent (-1) ) at two different activation temperatures (60 or 100 °C, respectively). Chemisorption was the principal mechanism for CO2 capture. Cyclic CO2 sorption/desorption measurements were carried out to test the recyclability of [10]-OU. Activating the sample at 60 °C, three stable CO2 sorption cycles were achieved after running the first cycle.

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Section: Resultsmentioning

confidence: 85%

[n]‐Oligourea‐Based Green Sorbents with Enhanced CO₂ Sorption Capacity

et al. 2015

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“…This, along with the high present cost of synthetic methane and hydrogen [4], are from today's perspective a factor that makes instant implementation implausible. However, in numerous studies, such as Sternberg 2015, Robinius 2015, ETG-Task-Force 2012, DLR 2012 and Prognos AG 2012, about the future energy system in Germany, it is assumed that both the massive expansion of renewable power generation and the availability of large quantities of excess power will also lead to a reduction in costs [8,[49][50][51][52][53]. Through the use of alternative technologies for steelmaking, future energy systems could also be supported because the released power generation capacity of the integrated steelworks could be used as backup power to ensure security of supply in a strong share of fluctuating renewable energies for power generation.…”

Section: Discussionmentioning

confidence: 99%

Power-to-Steel: Reducing CO2 through the Integration of Renewable Energy and Hydrogen into the German Steel Industry

et al. 2017

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This paper analyses some possible means by which renewable power could be integrated into the steel manufacturing process, with techniques such as blast furnace gas recirculation (BF-GR), furnaces that utilize carbon capture, a higher share of electrical arc furnaces (EAFs) and the use of direct reduced iron with hydrogen as reduction agent (H-DR). It is demonstrated that these processes could lead to less dependence on-and ultimately complete independence from-coal. This opens the possibility of providing the steel industry with power and heat by coupling to renewable power generation (sector coupling). In this context, it is shown using the example of Germany that with these technologies, reductions of 47-95% of CO 2 emissions against 1990 levels and 27-95% of primary energy demand against 2008 can be achieved through the integration of 12-274 TWh of renewable electrical power into the steel industry. Thereby, a substantial contribution to reducing CO 2 emissions and fuel demand could be made (although it would fall short of realizing the German government's target of a 50% reduction in power consumption by 2050).

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“…In 2012, our group [69] reported another effective route for the syntheses of N-substituted dicarbamates from dialkyl carbonates and polyurea derivatives, in which polyurea derivatives could be successfully synthesized from aliphatic diamines and CO 2 in the absence of any catalyst (Eqs. 15 and 16).…”

Section: Methodsmentioning

confidence: 99%

Important Green Chemistry and Catalysis: Non‐phosgene Syntheses of Isocyanates – Thermal Cracking Way

2017

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Currently, industrial production of isocyanates, or diisocyanates in particular, has been exclusively based on phosgene processes. Phosgene is extremely toxic and large amounts of corrosive HCl are produced as a side product. In the view of environment protection and society safety, development of non-phosgene processes for isocyanates production will be highly desired, and this should be one of the most important missions for green chemistry and catalysis. In this review, efforts for development of non-phosgene method for syntheses of isocyanates, i.e., catalytic syntheses of N-substituted carbamates from nitro-or amino-compounds with CO, dimethyl carbonate (DMC), urea and even CO 2 etc. as carbonyl sources, then thermal cracking of N-substituted carbamates to afford corresponding isocyanates, are summarized, and a brief prospect for non-phosgene syntheses of isocyanates is also addressed.

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A new route of CO2 catalytic activation: syntheses of N-substituted carbamates from dialkyl carbonates and polyureas

Cited by 97 publications

References 49 publications

[n]‐Oligourea‐Based Green Sorbents with Enhanced CO₂ Sorption Capacity

[n]‐Oligourea‐Based Green Sorbents with Enhanced CO₂ Sorption Capacity

Power-to-Steel: Reducing CO2 through the Integration of Renewable Energy and Hydrogen into the German Steel Industry

Important Green Chemistry and Catalysis: Non‐phosgene Syntheses of Isocyanates – Thermal Cracking Way

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A new route of CO2 catalytic activation: syntheses of N-substituted carbamates from dialkyl carbonates and polyureas

Cited by 97 publications

References 49 publications

[n]‐Oligourea‐Based Green Sorbents with Enhanced CO2 Sorption Capacity

[n]‐Oligourea‐Based Green Sorbents with Enhanced CO2 Sorption Capacity

Power-to-Steel: Reducing CO2 through the Integration of Renewable Energy and Hydrogen into the German Steel Industry

Important Green Chemistry and Catalysis: Non‐phosgene Syntheses of Isocyanates – Thermal Cracking Way

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[n]‐Oligourea‐Based Green Sorbents with Enhanced CO₂ Sorption Capacity

[n]‐Oligourea‐Based Green Sorbents with Enhanced CO₂ Sorption Capacity