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Selective catalyst reduction (SCR) systems are the most effective technique used to reduce NO<jats:sub>X<\/jats:sub> emissions. In this study, the effects of an SCR reactor on NO<jats:sub>X<\/jats:sub> emissions and performance in high-pressure selective catalytic reduction (HP-SCR) systems were investigated numerically. In numerical studies, the effects of SCR system diameter, output form, catalyst activation energy, mixing zone length, and location were investigated as parametric, and the most suitable system geometry was determined. The effects of geometric parameters and catalyst type on emission and performance such as NO<jats:sub>X<\/jats:sub> reduction, NH<jats:sub>3<\/jats:sub> slip, velocity, and pressure loss were investigated. It was determined that with increasing system diameter, whereas the NO<jats:sub>X<\/jats:sub> reduction performance increased depending on exhaust velocity, the pressure drop decreased, and the most suitable system diameter was determined as 780 mm. Furthermore, the obtained results showed that the performance of NO<jats:sub>X<\/jats:sub> reduction decreased after 2 \u00d7 10<jats:sup>6<\/jats:sup> kJ\/kmol activation energy, and the most suitable SCR output form was conical geometry. In terms of the environment, this study will contribute to achieving the UN Sustainable Development Goals such as climate action (SDG 13).<\/jats:p>","DOI":"10.1007\/s11356-024-33439-y","type":"journal-article","created":{"date-parts":[[2024,4,26]],"date-time":"2024-04-26T11:01:38Z","timestamp":1714129298000},"page":"32813-32825","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Reduction of the harmful NOx pollutants emitted from the ship engines using high-pressure selective catalytic reduction system"],"prefix":"10.1007","volume":"31","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5838-6132","authenticated-orcid":false,"given":"Kubilay","family":"Bayramo\u011flu","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0791-4476","authenticated-orcid":false,"given":"Semih","family":"Y\u0131lmaz","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2779-7980","authenticated-orcid":false,"given":"Mustafa","family":"Nuran","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2024,4,26]]},"reference":[{"key":"33439_CR1","doi-asserted-by":"publisher","unstructured":"ANSYS Inc. 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Therefore, formal ethical approval was not required.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval"}},{"value":"We, (Kubilay Bayramo\u011flu Semih Y\u0131lmaz, Mustafa Nuran), hereby solemnly declare our voluntary participation in this study. We have fully understood the purpose, procedures, potential benefits, and risks of the research and have had the opportunity to have all related questions answered. We affirm that our participation is voluntary and acknowledge that we have the right to withdraw at any time without any adverse consequences.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent to participate"}},{"value":"We, (Kubilay Bayramo\u011flu Semih Y\u0131lmaz, Mustafa Nuran), hereby indicate our agreement to publish the papers and results related to this study. We understand that once the paper is accepted for publication, it will become publicly accessible information. We agree to be responsible for the content we have contributed and confirm that the information provided is accurate and truthful. We agree to adhere to the ethics and standards of publication and commit to maintaining academic integrity throughout the publication process.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for publication"}},{"value":"The authors declare no competing interests.","order":5,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}}]}}