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PubMed Journals Articles About "Carbon Dioxide Capture Could Become Business" RSS

10:30 EST 6th December 2019 | BioPortfolio

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Showing "Carbon dioxide capture could become business" PubMed Articles 1–25 of 5,700+

Methoxy Groups Increase Reactivity of Bifunctional Tetraarylphosphonium Salt Catalysts for Carbon Dioxide Fixation: A Mechanistic Study.

The development of carbon dioxide fixation under mild conditions is a central theme in organic synthesis. Despite the tremendous progress in the field of organocatalysis in the past two decades, the coupling reactions of epoxides with carbon dioxide that proceed at atmospheric pressure at temperatures of less than 100 °C have remained challenging. In our aspirational studies of tetraarylphosphonium salts (TAPS) catalysis, we report here the bifunctional TAPS-catalyzed synthesis of five-membered cyclic carb...


Aluminium-Mediated Carbon Dioxide Reduction by an Isolated Monoalumoxane Anion.

The deoxygenative conversion of carbon dioxide to carbon monoxide is promoted by the aluminyl anion [Al(NON Ar )] - (NON Ar = [O(SiMe 2 NAr) 2 ] 2- , Ar  = 2,6- i Pr 2 C 6 H 3 ). The reaction proceeds via the isolable monoalumoxane anion [Al(NON Ar )(O)] - , containing a terminal aluminum-oxygen bond. This species reacts with a second equivalent of carbon dioxide to afford the carbonate [Al(NON Ar )(CO 3 )] - , and with nitrous oxide to generate the hyponitrite anion, [Al(NON Ar )(k 2 O , O' -N 2 O 2 )] - ...

Carbon allowance allocation in the shipping industry under EEDI and non-EEDI.

The CO emissions targets in this study are based on the Paris Agreement, which aims to cut emissions in 2050 to half of the 2005 levels, with a focus on the shipping industry. This study uses data for various kinds of vessels following the guidelines set in the Energy Efficiency Design Index (EEDI) and examines emission levels and the results of using different strategies during three different business climates. Carbon allowance allocations and cost benefit ratios (CBR) are included. The results show that ...


End Tidal Carbon Dioxide Underestimates Plasma Carbon Dioxide During Emergent Trauma Laparotomy Leading to Hypoventilation and Misguided Resuscitation: A Western Trauma Association Multicenter Study.

End tidal carbon dioxide(ETCO2) is routinely used during elective surgery to monitor ventilation. The role of ETCO2 monitoring in emergent trauma operations is poorly understood. We hypothesized that ETCO2 values underestimate plasma carbon dioxide(pCO2) values during resuscitation for hemorrhagic shock.

Carbon Dioxide Angiography in the Treatment of Transplant Renal Artery Stenosis.

Transplant renal stenosis (TRAS) is a serious complication associated with graft loss. Selective carbon dioxide angiography allows for effective diagnosis and therapy with the use of minimal to no contrast agent. This study sought to evaluate the efficacy of the adjunctive use of carbon dioxide angiography in the treatment of TRAS.

Analysis and recommendations for European carbon dioxide utilization policies.

Due to lower-cost energy supplies elsewhere, Europe needs resource efficient technologies to safeguard the competitiveness of its energy-intensive industries. The technical feasibility of the CCU value chain components (carbon capture, transportation and utilization) has been widely studied in literature. However infrastructural, regulatory and business strategic issues have received less attention. A review of the relevant policies (e.g. European Emissions Trading Scheme, Renewable Fuels and Waste Directiv...

Direct electrochemical reduction of carbon dioxide by a molybdenum-containing formate dehydrogenase.

Formate dehydrogenase enzymes catalyse the reversible two-electron oxidation of formate to carbon dioxide. The class of metal-dependent formate dehydrogenases comprises prokaryotic enzymes holding redox-active centres and a catalytic site, containing either molybdenum or tungsten ion, that mediates the formate/carbon dioxide interconversion. The carbon dioxide reduction is of a particular interest, since it may be a route for its atmospheric mitigation with the simultaneous production of added-value product...

Synthesis of Zeolite 4A from Kaolin and Its Adsorption Equilibrium of Carbon Dioxide.

Zeolite 4A was successfully prepared by hydrothermal synthesis using low-grade kaolin as a raw material. The properties of the synthesized zeolite 4A were characterized by means of X-ray diffraction (XRD), Fourier transform infrared (FTIR), Si magic-angle spinning (MAS)-nuclear magnetic resonance (NMR) and Al MAS-NMR, X-ray fluorescence (XRF), scanning electron microscopy (SEM)-energy-dispersive spectrometry (EDS), transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET), thermogravimetry (TG)-d...

Integrated CO Capture and Conversion to Formate and Methanol: Connecting Two Threads.

The capture of CO from concentrated emission sources as well as from air represents a process of paramount importance in view of the increasing CO concentration in the atmosphere and its associated negative consequences on the biosphere. Once captured using various technologies, CO is desorbed and compressed for either storage (carbon capture and storage (CCS)) or production of value-added products (carbon capture and utilization (CCU)). Among various products that can be synthesized from CO, methanol and f...

Synthesis of Oxazolidinones using Carbon Dioxide as a C-1 Building Block and an Aluminium-based Catalyst.

Oxazolidinone synthesis by the coupling of carbon dioxide and aziridines is catalysed by an aluminium(salphen) complex at 50-100 oC and 1-10 bar pressure under solvent-free conditions. The process is applicable to a variety of substituted aziridines, giving products with high regioselectivity. It involves the use of a sustainable and reusable aluminium-based catalyst, uses carbon dioxide as a C-1 source and provides access to pharmaceutically important oxazolidinones as illustrated by a total synthesis of t...

An overview on trace CO removal by advanced physisorbent materials.

This review paper focuses on various gas processing technologies and materials that efficiently capture trace levels of carbon dioxide (CO). Fundamental separation mechanisms such as absorption, adsorption, and distillation technology are presented. Liquid amine-based carbon capture (C-capture) technologies have been in existence for over half a century, however, liquid amine capture relies upon chemical reactions and is energy-intensive. Liquid amines are thus not economically viable for broad deployment a...

Reducing carbon dioxide emissions; Does renewable energy matter?

The study employed panel cointegration techniques to investigate the relationship between renewable energy and carbon dioxide emissions for 28 Sub-Sahara African countries spanning the period 1980-2014. The findings based on the Fully Modified OLS and GMM estimation techniques show that both renewable and nonrenewable energy contribute to carbon dioxide emissions in the countries studied in the long run but only nonrenewable energy has a significant positive effect on carbon dioxide emissions in the short r...

Examining the influences of urbanization on carbon dioxide emissions in the Yangtze River Delta, China: Kuznets curve relationship.

Exploring the impacts of urbanization on carbon dioxide emissions is a task that is of great significance in efforts to build low-carbon cities in China. While existing literature has identified links between carbon dioxide emissions and urbanization, the impacts of various mechanisms in various urbanization subsystems (economic, demographic, spatial, and social urbanization) on carbon dioxide emissions remain largely unexplored. This study conducts a comprehensive assessment of the multiple effects of urba...

Advances in the use of CO as a renewable feedstock for the synthesis of polymers.

Carbon dioxide offers an accessible, cheap and renewable carbon feedstock for synthesis. Current interest in the area of carbon dioxide valorisation aims at new, emerging technologies that are able to provide new opportunities to turn a waste into value. Polymers are among the most widely produced chemicals in the world greatly affecting the quality of life. However, there are growing concerns about the lack of reuse of the majority of the consumer plastics and their after-life disposal resulting in an incr...

Deep seam and minesoil carbon sequestration potential of the South Wales Coalfield, UK.

Combustion of coal for energy generation has been a significant contributor to increased concentrations of atmospheric carbon dioxide. It is of interest to evaluate the potential of former coalfields for mitigating these increases by carbon sequestration and to compare different options to achieving this end. Here, carbon sequestration in residual coal seams and through reclamation of spoil tips is compared, and their carbon dioxide storage potential in the South Wales Coalfield estimated. Coal seam sequest...

Photosensitization of Lithium Di Silicate Ceramic by Er, Cr: YSGG and Fractional Carbon dioxide Laser Bonded to Orthodontic Bracket.

To evaluate the shear bond strength (SBS) and modes of lithium disilicate ceramics (LDC) photosensitized by Er,Cr:YSGG (ECL) and fractional carbon dioxide (CO) laser bonded to metallic bracket compared to traditional conditioning methods.

2D-layered Ni-MgO-Al2O3 nano-sheets for integrated capture and methanation of CO2.

CO2 capture is an enabling technology for carbon conversion and storage, however high cost of the process hindered its large-scale application. Therefore, new approaches for carbon abatement, particularly from diluted sources, are urgently needed. Herein, based on adsorption and catalysis bi-functional 2D-layered Ni-MgO-Al2O3 nano-sheets, we report a two-step "capture and methanation" process for the removal and utilization of CO2, no energy input for desorption was needed. Continuous and nearly 100% captur...

Results of carbon dioxide laser-assisted posterior cordotomy in cases of bilateral vocal cord paralysis: An analysis of 34 casest.

Carbon dioxide laser-assisted posterior cordotomy (LAPC) is an effective technique for the treatment of Bilateral Vocal Cord Paralysis (BVCP). For our case series we included 34 patients of BVCP from combined military hospitals of Rawalpindi, Lahore, Malir and Quetta and compiled the results of carbon dioxide LAPC which they underwent under general anesthesia between December 2009 to January 2017. Assessment of voice quality and breathing difficulty was carried out before and six weeks after the operation a...

Maximum value of end-tidal carbon dioxide concentrations during resuscitation as an indicator of return of spontaneous circulation in out-of-hospital cardiac arrest.

The end-tidal carbon dioxide (ETCO) concentration during resuscitation (CPR) of an out-of-hospital cardiac arrest (OHCA) has an increasingly well-known prognostic value. Nevertheless, few studies have investigated its maximum value in different etiologies.

Rh(I)-Catalyzed P(III)-Directed C-H Bond Alkylation: Design of Multifunctional Phosphines for Carboxylation of Aryl Bromides with Carbon Dioxide.

We report herein the C-H bond alkylation with alkenes of biarylphosphines at ortho'-position(s) using rhodium(I) catalysis providing a straightforward access to a large library of multifunctionalized phosphines. Some of these modified ligands have outperformed commercially available phosphines in Pd-catalyzed carboxylation of aryl bromides with carbon dioxide in the presence of a photoredox catalyst.

The Emergence of Carbon Isotope Exchange.

Significant progress in C-C bond activation with transition metals has recently enabled the development of several carbon isotope exchange reactions. These methods are based on C-C bond decarboxylative carboxylation reactions in the presence of selected transition metals and labelled carbon monoxide or carbon dioxide.

Ruthenium-Catalyzed Synthesis of Cyclic and Linear Acetals via the Combined Utilisation of CO2, H2 and Biomass Derived Diols.

Herein a transition metal catalyst system for the selective synthesis of cyclic and linear acetals from the combined utilisation of carbon dioxide, molecular hydrogen and biomass derived diols is presented. Detailed investigations on the substrate scope enabled to largely guide the selectivity of the reaction and demonstrated the possibility to integrate a broad variety of substrate molecules. This approach allowed to change between the favored formation of cyclic acetals and linear acetals, originating fro...

A Meta-Analysis of Efficacy of Carbon Dioxide Inhalation as a Challenge Test in Panic Disorder.

The objective of this study is to perform a systematic review and meta-analysis on whether patients with panic disorder (PD) and their healthy first-degree relatives have an increased sensitivity to carbon dioxide inhalation test compared to healthy controls (HC) or patients with psychiatric disorders other than panic disorder.

Modification of multi-walled carbon nanotubes by 1,3-diaminopropane to increase CO adsorption capacity.

Greenhouse gas emissions have increased dramatically over the past years and had a significant impact on global warming. This study investigates the modification of multi-walled carbon nanotubes (MWCNTs) with diamine precursor to improve the carbon dioxide adsorption capacity. To achieve this goal, pristine multi-walled CNTs were functionalized in a two-step process. In the first step, multi-walled carbon nanotubes were functionalized with a mixture of diluted sulfuric and nitric acid (5 M HNO/5 M HSO w...

An Anesthesia Attempt to Be Green: How Do You Waste Your Carbon Dioxide Absorbers?

Operating room waste is categorized as noncontaminated solid waste (SW) and regulated medical waste (RMW). RMW is treated by autoclaving at an increased economic and environmental cost. We evaluated these costs with a focus on the disposable carbon dioxide (CO2) absorbers. At our institution, exhausted CO2 absorbers were discarded as RMW. We collaborated with product representatives, anesthesia and perioperative staff, and waste management personnel to identify opportunities and barriers for recycling and w...


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