Hydrodeoxygenation (HDO) reactions under low/atmospheric pressure of hydrogen should be studied to solve the problem of the economics of the high-pressure hydrogen upgrading process. Therefore, in this study, the catalytic HDO reaction of m-cresol in atmospheric hydrogen pressure was evaluated using Ni/silica and Nickel silicate (Ni-MCM-41) catalysts. The Ni-MCM-41 catalyst exhibited higher conversion of m-cresol than Ni/silica. The high activity of the Ni-MCM-41 catalyst was due to the large specific surface area and the high nickel loading.
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http://dx.doi.org/10.1166/jnn.2020.17640 | DOI Listing |
Environ Sci Technol
January 2025
Institute of Marine Science and Technology, Shandong University, Qingdao, Shandong 266237, China.
Ocean alkalinity enhancement (OAE) based on enhanced weathering of olivine (EWO) is a promising marine carbon dioxide removal (mCDR) technique. Previous research primarily focuses on the toxicological effects of potentially toxic metals (PTMs) released from olivine. In this Perspective, we explore the overlooked impacts of EWO on environmental media in two scenarios: olivine applied to beaches/shallow continental shelves and offshore dispersion by vessels.
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December 2024
Gulbali Institute, Charles Sturt University, Wagga, NSW 2650, Australia.
The most commonly used methods to chemically assess grape and wine quality with high sensitivity and selectivity require lengthy analysis time and can be resource intensive. Here, we developed a rapid and non-destructive method that would help in grading and decision support. In this work, we demonstrate that integrating a three-dimensional (3D) material for volatile sampling with mass spectrometry detection can be used to sample grapes for phytosanitary, quality or smoke-taint assessments at low levels of marker compounds.
View Article and Find Full Text PDFPLoS One
December 2024
Centro de Astrobiología (CAB), CSIC-INTA, Madrid, Spain.
Extensive carbonate precipitation has occurred on Mars. To gain insight into the carbonation mechanisms and formation processes under ancient Martian aqueous conditions, we examine the precipitation of carbonates resulting from atmospheric carbon fixation, focusing on interactions between various brines and silicate and perchlorate solutions in alkaline environments. The micro-scale morphology and composition of the resulting precipitates are analysed using ESEM micrographs, EDX chemical compositional analysis, X-ray diffraction, and micro-Raman spectroscopy.
View Article and Find Full Text PDFAstrobiology
December 2024
Department of Mineralogy, University of Hannover, Germany.
Nontraditional stable isotopes of bioactive metals emerged as novel proxies for reconstructing the biogeochemical cycling of metals, which serve as cofactors in major metabolic pathways. The fractionation of metal isotopes between ambient fluid and microorganisms is ultimately recorded in authigenic minerals, such as carbonates, which makes them potentially more reliable than standard biomarkers in organic matter. Stromatolitic carbonates are geochemical archives that allow for the study of the long-term interplay of the biosphere, atmosphere, and hydrosphere through deep time, with the unique potential to investigate early life environments and the evolution of the metallome.
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November 2024
Chemical Department, Institute of General and Ecological Chemistry, Lodz University of Technology, Zeromskiego 116, 90-543 Lodz, Poland.
The aim of this work was to investigate the hydrocracking of algae oil derived from Spirulina Platensis species catalyzed with bi-component nickel-zirconia catalysts supported onto different carriers (BEA, ZSM-5 and AlO) in an autoclave at 320 °C for 2 h with a hydrogen pressure of 75 bar. All catalysts were prepared using the wet co-impregnation method and were characterized by H-TPR, XRD, NH-TPD, BET and SEM-EDS. Before reactions, catalysts were calcined at 600 °C for 4 h in a muffle furnace, then reduced with 5%H-95%Ar reducing mixture at 500 °C, 600 °C or 700 °C for 2 h.
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