CO2 Hydrogenation to Olefin-Rich Hydrocarbons Over Fe-Cu Bimetallic Catalysts: An Investigation of Fe-Cu Interaction and Surface Species

Previously, we reported a strong Fe-Cu synergy in CO2 hydrogenation to olefin-rich C2+ hydrocarbons over the γ-Al2O3 supported bimetallic Fe-Cu catalysts. In this work, we aimed to clarify such a synergy by investigating the catalyst structure, Fe-Cu interaction, and catalyst surface properties through a series of characterizations. H2-TPR results showed that the addition of Cu made both Fe and Cu easier to reduce via the strong interaction between Fe and Cu. It was further confirmed by X-ray absorption spectroscopy (XAS) and TEM, which showed the presence of metallic Fe and Fe-Cu alloy phases in the reduced Fe-Cu(0.17) catalyst induced by Cu addition. By correlating TPD results with the reaction performance, we found that the addition of Cu enhanced both the moderately and strongly adsorbed H2 and CO2 species, consequently enhanced CO2 conversion and C2+ selectivity. Adding K increased the adsorbed-CO2/adsorbed-H2 ratio by greatly enhancing the moderately and strongly adsorbed CO2 and slightly suppressing the moderately and strongly adsorbed H2, resulting in a significantly increased O/P ratio in the produced hydrocarbons. The product distribution analysis and in situ DRIFTS suggested that CO2 hydrogenation over the Fe-Cu catalyst involved both an indirect route with CO as the primary product and a direct route to higher hydrocarbons.

Neck motor unit activity displays neural signatures of temporal control during sequential saccade planning

Goal-directed behavior involves the transformation of neural movement plans into appropriate muscle activity patterns. Studies involving single saccades have shown that a rapid, direct pathway links saccade planning in frontal eye fields (FEF) to neck muscle activity. It is unknown if the rapid connection between FEF and neck muscle is maintained during sequential saccade planning. We show that sequence planning signals in the FEF are preserved in the neck EMG, although the activity is delayed specifically for the second saccade. Our results suggest that while the direct link between FEF and neck muscle facilitates downstream continuation of FEF response patterns, an indirect route exists through an inhibitory control center like the basal ganglia, limiting the information flow during processing of saccade sequences. Thus, the indirect and direct pathways from the FEF may function together to enable rapid synchronous, but controlled eye-head responses to sequential gaze shifts.

Insights Into the Prevalence and Impacts of Phthalate Esters in Aquatic Ecosystems

Phthalate esters (PEs) are by far the most produced and extensively used synthetic organic chemicals with notable applications in many industrial products such as vinyl upholstery, adhesives, food containers, packaging materials, printing inks, adhesives, cosmetics, paints, pharmaceuticals munitions, and insecticides among other. PEs have long been recognised as ubiquitous organic pollutants of prime environmental concern, with urbanisation amongst the main cause and source of these compounds. Due to their notoriety, these compounds are known to pose devastating effects to living organisms including humans. The presence of PEs and their metabolites in the aquatic ecosystems is of concern primarily due to their endocrine disrupting and carcinogenicity properties. Several research studies have reported prevalence, exposure pathways, toxicity, and impacts of PEs in aquatic ecosystems and humans. Their principal routes of exposure could be direct or indirect, of which the direct route include contact, eating, and drinking contaminated foods, and the indirect route constitute aerosols, leaching and other forms of environmental contamination. PEs find way into water systems through means such as effluent discharges, urban and agricultural land runoff, leaching from waste dumps and other diffuse sources. High-end instrumentation and improved methodologies on the other hand have resulted in increased ability to measure trace levels (μg/L) of PEs and their metabolites in different matrices and ecological compartments of water or aquatic ecosystems such as lakes, oceans, rivers, sediments, wetlands and drinking water samples. In light of the above, this article provides an informed and focused information on the prevalence of phthalate esters in aquatic systems and related effects on living organisms and humans. Furthermore, techniques that have enabled the extraction and analysis of these PEs in aquatic samples are also explained. Future research outlooks and needs are also highlighted in this manuscript. This information will be used to better understand their temporal and spatial distributions in the aquatic systems and aid in devising prudent means to curtail their ecological footprints.

Direct and indirect pathways of convected water masses and their impacts on the overturning dynamics of the Labrador Sea

<p>The dense waters formed by wintertime convection in the Labrador Sea play a key role in setting the properties of the deep Atlantic Ocean. To understand how variability in their production might affect the Atlantic Meridional Overturning Circulation (AMOC) variability, it is essential to determine pathways and associated timescales of their export. In this study, we analyze the trajectories of Argo floats and of Lagrangian particles launched at 53<sup>o</sup>N in the boundary current and traced backwards in time in a high‐resolution model, to identify and quantify the importance of upstream pathways. We find that 85% of the transport carried by the particles at 53<sup>o</sup>N originates from Cape Farewell, and it is split between a direct route that follows the boundary current and an indirect route involving boundary‐interior exchanges. Although both routes contribute roughly equally to the maximum overturning, the indirect route governs its signal in denser layers. This indirect route has two branches: part of the convected water is exported rapidly on the Labrador side of the basin, and part follows a longer route towards Greenland and is then carried with the boundary current. Export timescales of these two branches typically differ by 2.5 years. This study thus shows that boundary‐interior exchanges are important for the pathways and the properties of water masses arriving at 53<sup>o</sup>N. It reveals a complex three‐dimensional view of the convected water export, with implications for the arrival time of signals of variability therein at 53<sup>o</sup>N and thus for our understanding of the AMOC.</p>

Electrochemical ammonia synthesis from nitrite assisted by in-situ generated hydrogen atoms on nickel phosphide catalyst

Exploring green and effective means for ammonia synthesis is an important but challenging task. EAS from indirect route (N2→NOx→NH3) provides a feasible alternative strategy. The key step in this route...

Foreign aid, oil revenues, and political accountability: Evidence from six experiments in Ghana and Uganda

Foreign aid may act much like oil money in reducing voters’ willingness to demand accountability from their government, enabling corruption, clientelism, and repression. This is an important causal mechanism connecting public budgets to quality of governance. Yet other scholarship counters that aid is more beneficial than oil, either indirectly because of donor oversight or directly because aid is more likely to produce citizen pressures on governments. Empirical work on the topic employs observational data at the national, macro level, and has left the question unresolved. At the micro level, in some countries citizens have experience with aid revenues and oil funds, thus possessing information about the political implications of these different revenue sources. This article provides the first experimental tests of the direct mechanism linking aid and oil revenues to demands from citizens for greater political accountability. We report the effects of randomly assigned treatments identifying aid funds compared to oil money on behavior of citizens in six survey and lab experiments in Ghana and Uganda. We find no differences in accountability pressures when subjects are randomly assigned to aid or oil conditions in any experiment, including a survey-based field experiment in Uganda that employed very strong information treatments on the extent of aid and oil funds. Though little evidence suggests that either windfall necessarily reduces accountability demands from baseline in a meaningful way, citizens’ actions for aid money were statistically indistinguishable from oil revenues across all experiments. Aid may well have governance effects through the indirect route of donor oversight, but the results presented here suggest no evidence that aid, compared to oil, directly induces greater accountability demands among citizens.

Using numbers in CSR communication and their effects on motive attributions

Purpose This study aims to investigate how judgments of firms’ underlying motives are affected by corporate social responsibility (CSR) communication which features percentages of profit allocations to CSR causes. It also examines how firm size interacts with CSR spending allocations affecting motive attributions for firms of different sizes. Design/methodology/approach Two experiments were carried out manipulating CSR spending allocations (smaller vs larger percentage of profit) and firm size (small vs large firm). Findings A larger percentage of profits allocated to CSR enhanced value-driven motives and inhibited inferences of manipulative intent, which produced lower egoistic-driven motives. Large firms allocating smaller percentages to CSR were judged as less value-driven and were more prone to elicit manipulative intent. Originality/value Two routes of motive attributions were identified – a direct route, contingent on CSR spending allocations and firm size; and an indirect route via inferences of manipulative intent, which inhibited favorable motives and prompted unfavorable ones. Both routes resulted from numerical cognition associated with the processing of numbers. Managerial implications include suggestions for firms wishing to overcome negative consumer bias arising from communication featuring CSR spending allocations and firm size.

The indirect route of securing interest of consumers and competitors under the EU competition law

The theme of the present article is to deliver the notion that in order to enforce competition rules which, are aimed at maintaining a balance between profitability of the competitors and welfare of the consumers, the crucial aspect in attainting it is a healthy competitive market. Therefore, an attempt is made to analyses the role and practice of the European Courts and the Commission in protecting the structure of the competitive market as a means to secure the interests of the consumers and competitors. To convey the notion of the paper, sustenance from one of the imperative decisions given by the European Court of Justice purporting the predominant idea has been taken from the case of GlaxoSmithKline v Commission1 and other relevant cases from the locales of Article 101 coupled with Article 102 of the Treaty on the Functioning of the European Union. The idea is to critically discuss the rationale of the decision delivered by the hierarchy of courts, the object-effect dichotomy under Article 101(1) for apprehending anti- competitive conduct, and to reflect upon the Commission guidelines.