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In an effort to contribute to global efforts by addressing the marine pollution from various emission types, this Special Issue of Ship Lifecyle for Journal of Marine Science and Engineering was inspired to provide a comprehensive insight for naval architects, marine engineers, designers, shipyards, and ship-owners who strive to find optimal ways to survive in competitive markets by improving cycle time and the capacity to reduce design, production, and operation costs while pursuing zero emission. In this context, this Special Issue is devoted to providing insights into the latest research and technical developments on ship systems and operation with a life cycle point of view. The goal of this Special Issue is to bring together researchers from the whole marine and maritime community into a common forum to share cutting-edge research on cleaner shipping. It is strongly believed that such a joint effort will contribute to enhancing the sustainability of the marine and maritime activities. This Special Issue features six novel publications dedicated to this endeavor. First of all, as a proactive response to transitioning to cleaner marine fuel sources, numerous aspects of the excellence of fuel-cell based hybrid ships were demonstrated through four publications. In addition, two publications demonstrated the effectiveness of life cycle assessment (LCA) applicable to marine vessels.

electric propulsion system --- DFE rectifier --- AFE rectifier --- phase angle detector --- hybrid power source --- fuel cell --- molten carbonate fuel cell (MCFC) --- carbon dioxide --- Molten carbonate fuel cell (MCFC) --- Hybrid test bed --- Operation profile --- Power quality --- life cycle --- maintenance costs --- propulsion system maintenance --- research vessel --- LNG-fueled ship --- IMO GHG --- LNG --- MGO --- LCA --- marine fuel --- hybrid power system --- failure mode and effects analysis --- risk priority number --- ship safety --- Kendall’s coefficient --- life cycle assessment (LCA), maritime environment --- sustainable production and shipping --- CO2 emissions --- NOx emissions --- SOx emissions

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This Special Issue on “New Trends in Catalysis for Sustainable CO2 Conversion”, released in the Catalysts open access journal, shows new research about the development of catalysts and catalytic routes for CO2 valorization, in addition to the optimization of the reaction conditions for the process. This issue includes ten articles and three reviews about different innovative processes for CO2 conversion.Carbon capture and storage (CCS) is a physical process consisting of the separation the CO2 (emitted by industry and the combustion processes for energy generation) and its transportation to geological storage isolates it from the atmosphere in the long term. However, the most promising routes for CO2 mitigation are those pursuing its catalytic valorization. By applying specific catalysts and suitable operating conditions, CO2 molecules react with other components to form longer chains (i.e., hydrocarbons). Accordingly, effort should be made to catalytically valorize CO2 (alone or co-fed with syngas) as an alternative way of reducing greenhouse gas emissions and obtaining high-value fuels and chemicals. Carbon capture and utilization (CCU) is a developing field with significant demand for research in the following aspects:The development of new catalysts, catalytic routes, and technologies for CO2 conversion;The study of new processes for obtaining fuels and chemicals from CO2;Optimization of the catalysts and the reaction conditions for these processes;Further steps in advanced processes using CO2-rich feeds (H2+CO2 or CO2 mixed with syngas), increasing product yields.

Technology: general issues --- History of engineering & technology --- Environmental science, engineering & technology --- carbon dioxide --- hydrogenation --- catalyst --- gas hourly space velocity (GHSV) --- fixed-bed reactor --- CO2–H2O photo-co-processing --- VIS-light driven reactions --- CO2 reduction --- photocatalysts properties --- soft oxidant --- oxidation --- dehydrogenation --- nano-catalyst --- electrochemical reduction of CO2 --- ionic liquids --- propylene carbonate --- imidazolium cation --- greenhouse gas --- climate change --- CO2 decomposition --- CO2 utilization --- SrFeO3−x --- CO2 methanation --- Ni-xSi/ZrO2 --- Si promotion --- oxygen vacancies --- CO2 hydrogenation --- light olefins --- catalyst deactivation --- CO2-Fischer-Tropsch (CO2-FT) --- iron-based catalysts --- methanol to olefins --- bifunctional composite catalysts --- SAPO-34 --- photocatalysis --- carbon-TiO2 --- nanocarbon --- carbon allotropes --- carbon nanotubes --- carbon nanofibers --- carbon nano-onions --- carbon dioxide electrolysis --- molten carbonate --- greenhouse gas mitigation --- cycloaddition --- ionic liquid --- deep eutectic solvents --- onium salt --- homogeneous catalysts --- heterogeneous catalysis --- CO2 conversion --- methane --- hydrocarbons --- iron oxide --- copper nanoparticles --- biomass --- Fischer–Tropsch synthesis --- carbon-supported iron catalyst --- gasoline --- diesel --- n/a --- CO2-H2O photo-co-processing --- Fischer-Tropsch synthesis