[en] In recent years, the need for a new energy model has been increased. This energy model should be free of fossil fuels and sustainable, but at the same time, it must be environmentally friendly in order to reduce the associated climate change. One of the technologies within this new model is the so-called "power to gas". This technology fulfills the conditions previously indicated as it produces methane from renewable hydrogen and carbon dioxide. Hydrogen is obtained from the hydrolysis of water through the use of solar or wind energy, which will later be used to produce the necessary methane. Otherwise, the necessary carbon monoxide can come from pollutant emissions, thus avoiding the emission of this pollutant into the atmosphere. Therefore, the current challenge will be to achieve a profitable methane production, which derives from an adequate conversion of carbon dioxide. In this respect, the aim of this project will be to achieve a profitable methane production. For this purpose, different photocatalytic reaction tests will be carried out in an advanced system consisting of a Harrick camera. Due to the new system used, before being able to begin with the tests, it was necessary to proceed to the complete installation of the plant and its components, as well as its subsequent set up. After having consult and analyze the different researches done to date, it was decided to work with two different catalysts NiAl2O3 and AuTiO2. Because of the high price of gold, cheaper active metals were added to reduce associated costs. In order to find the optimal operating conditions of each catalyst and thus be able to make a comparison between them, different tests were carried out at different operating conditions, such as: different temperatures, spatial velocities and intensities of light. It is important to mention that due to different mishaps during the project only one catalyst (NiAl2O3) could be used to carry out the tests. To establish the optimum operating conditions, the work was carried out at constant spatial velocity and the influence of temperature and light were determined. On the one hand, the optimal temperature range during the development of the reaction was between 400-450C°, it was observed that at lower temperatures the catalyst was not active. On the other hand, it was determined that the application of light during the reaction improved the activity of the catalyst, therefore obtaining better results. In conclusion, the use of the NiAl2O3 catalyst in the adequate temperature range and applying light during the reaction could be an efficient, cost-effective and sustainable new energy model for producing methane, which could replace fossil fuels in order to reduce climate change. IDIOMA: INGLES

[eu] Azken urteotan, agerian geratu da eredu energetiko berri baten beharra. Erregai fosilik gabeko eredu iraunkorra eta aldi berean inguruarekiko errespetagarria dena. Eredu energetiko berri honen helburu nagusietako bat aldaketa klimatikoa gutxitzea izanik. Hori aurrera eramateko teknologia aipagarrietako bat "power to gas" izeneko prozesua da. Honek, aurretik aipaturiko baldintzak betetzen ditu, metanoa berriztagarria den hidrogenoaren eta karbono dioxidoaren arteko erreakzioren bitartez sortzen baititu. Aipaturiko hidrogeno berriztagarria urren hidrolisiaren bitartez sortuko da, beharrezko energia eguzki energiaren edo energia eolikoaren bitartez lortuz. Sorturiko hidrogeno hori hurrengo fasean metanoa lortzeko erabiliko da. Beste alde batetik, erreakzioa gertatzeko beharrezkoa den karbono dioxidoa kutsagarriak diren emisioetatik eratorritakoa izan daiteke, emisio horiek atmosferara igortzea ekidinez. Beraz, gaur egungo erronka nagusietariko bat errentagarria den prozesu batetatik metanoa sortzea izango da. Hau karbono dioxidoaren konbertsio egoki baten ondorioz lortuko da. Hortaz, proiektu honen helburuetako bat metanoa sortzeko prozesu errentagarria lortzea izango da, operazio baldintza egokiak lortuz. Horretarako, Harrick kamara batez osaturik dagoen sistema aurreratu bat erabiliz erreakzio fotokatalitiko ezberdinak aurrera eramango dira. Aipaturiko sistema berria izatearen ondorioz, ekipoaren eta horri loturiko elementu guztien instalazioa eta ondorengo doikuntzak egin behar izan ziren. Proiektua hasi baino lehen eginiko beste ikerketa batzuk aztertu ondoren NiAl2O3 eta AuTiO2 katalizatzaileekin lan egitea erabaki zen. Urreak duen kostu altuaren ondorioz, merkeagoak diren metal aktiboak gaineratu zitzaizkion, honen kostua murrizteko. Katalizatzaile bakoitzaren lan baldintza egokiak lortu eta horiek konparatu ahal izateko, baldintza ezberdinak erabiliz, hala nola, tenperatura ezberdinak abiadura espazial ezberdinak eta argiaren intentsitate ezberdinak erabiliz hainbat entsegu ezberdin aurrera eraman ziren. Aipagarria da, proiektuan zehar sorturiko ezustekoen eraginez, entseguak katalizatzaile bakarra erabiliz egin ziren (NiAl2O3). Lehenik eta behin, operazio baldintza egokiak lortzeko abiadura espazial konstantea izanik entsegu ezberdinak egin ziren, horrela, tenperaturak eta argiak duten eragina zehaztu ahal izan zen. Alde batetik, erreakzioa burutu ahal izateko tenperaturaren tarte egokiena 400-450 °C-koa dela zehaztu zen, tenperatura baxuetan katalizatzaileak aktibotasuna galtzen zuela ikusi baitzen. Beste alde batetik, erreakzioan zehar argiaren erabilerak katalizatzailearen aktibitatea hobetzen zuela frogatu zen, emaitzak hobetuz. Beraz, laburbilduz, argiaren erabileraren bitartez, NiAl2O3 katalizatzailea metanoa sortzeko baliatu daiteke, berria den eredu energetiko eraginkor, errentagarri eta iraunkor baten ondorioz. Horrela, aipaturiko teknologia hau erregai fosilak ordezka ditzake, aldaketa klimatikoa gutxituz. HIZKUNTZA: EUSKERA