Sulfidation and activity of Co/C catalysts having extremely low cobalt-loading: A Moessbauer emission spectroscopy and thiophene hydrodesulfurization study

Up to a sulfiding temp. of 473 K, the behavior of Co/C catalysts with extremely low cobalt loadings (ppm range) agrees with the trend obsd. before in the Moessbauer emission spectroscopy (MES) spectra of Co/C catalysts with much higher cobalt loadings (0.04-43. wt.%). Sulfiding at 573 K results in a rather well-defined very highly dispersed (most likely monatomically) Co sulfide species which shows a doublet with the extremely large value Q.S. = 4.11 mm/s. In this species the cobalt atoms may be four-fold (square-planar) or five-fold (square-pyramid) coordinated by sulfur. Sulfiding at 673 K results in the disappearance of this highly dispersed Co sulfide species and the newly formed species are again similar to the one previously found for Co/C catalysts with higher cobalt loadings. This finally formed Co sulfide species does not exhibit the Co-Mo-S MES spectrum (Q.S. between 1.0 and 1.3 mm/s) whereas its intrinsic thiophene hydrodesulfurization (HDS) activity equals that of cobalt in the Co-Mo-S phase. Thus, there is no general relation between the thiophene HDS activity (measured at atm. pressure) and the amt. of cobalt exhibiting a Co-Mo-S MES spectrum. [on SciFinder (R)

Port: A software tool for digital data donation

Recently, a new workflow has been introduced that allows academic researchers to partner with individuals interested in donating their digital trace data for academic research purposes (Boeschoten, Ausloos, et al., 2022). In this workflow, the digital traces of participants are processed locally on their own devices in such a way that only the subset of participants’ digital trace data that is of legitimate interest to a research project are shared with the researcher, which can only occur after the participant has provided their informed consent.This data donation workflow consists of the following steps: First, the participant requests a digital copy of their personal data at the platform of interest, such as Google, Meta, Twitter and other digital platforms, i.e., their Data Download Package (DDP). Platforms, as data controllers, are required as per the European Union’s General Data Protection Regulation (GDPR) to share a digital copy with each participant requesting such a copy. Second, they download the DDP onto their personal device. Third, by means of local processing, only thedata points of interest to the researcher are extracted from that DDP. Fourth, the participant inspects the extracted data points after which the participant can consent to donate. Only after providing this consent, the donated data is sent to a storage location and can be accessed by the researcher, which would mean that the storage location can be accessed for further analysis.In this paper, we introduce Port. Port is a software tool that allows researchers to configure the local processing step of the data donation workflow, allowing the researcher to collect exactly the digital traces needed to answer their research question. When using Port, a researcher can decide:• Which digital platforms are investigated;• Which digital traces are collected;• How the extracted digital traces are visually presented to the participant;• What is communicated to the participant

The enigmatic WR46: A binary or a pulsator in disguise. III. Interpretation

Wetensch. publicatieFaculteit der Wiskunde en Natuurwetenschappe

The enigmatic WR46: A binary or a pulsator in disguise. II. The spectroscopy

Wetensch. publicatieFaculteit der Wiskunde en Natuurwetenschappe