Onintze Parra

• University of the Basque Country

Klima-aldaketa da gaur egungo arazo handienetakoa gizartean. Hori dela eta, Energiaren Nazioarteko Agentziak (IEA) hainbat agertoki proposatu ditu, egungo politika eta joeren arebera, jarraitu beharreko gidalerroekin. Ildo horien artean, azkenaldian garrantzi handoagoa ematen zaie CO2-a bahitu, biltegiratu eta erabiltzeko prozesuei, bereziki azken...

An original kinetic model is proposed for the direct production of light olefins by hydrogenation of CO2/CO (COx) mixtures over an In2O3–ZrO2/SAPO-34 tandem catalyst, quantifying deactivation by coke. The reaction network comprises 12 individual reactions, and deactivation is quantified with expressions dependent on the concentration of methanol (a...

The adequate configuration and the effect of the reduction was studied for the In2O3-ZrO2/SAPO-34 catalyst with the aim of improving its performance (activity and selectivity in the pseudo-steady state) for the hydrogenation of CO, CO2 and CO2/CO (COx) mixtures into olefins. The experiments were carried out in a packed bed reactor at 400 °C; 30 bar...

The CO2 capture and utilization processes are becoming increasingly important due to the progressive augment in greenhouse gases. In this work, the production of hydrocarbons from CO2 in a single stage (with methanol as intermediate) was studied. Specifically, the Mn2O3-ZnO catalyst for the synthesis of intermediate methanol was investigated. It wa...

As a consequence of the increasing greenhouse gas emissions, CO2 valorization processes are gaining importance in the last decades. Amongst the most attractive processes for CO2 utilization, its conversion into hydrocarbons stands out, in particular by means of catalytic processes with syngas co-feeding. With this purpose, an In2O3-ZrO2 (InZr) cata...

On account of the superior performance of In2O3-ZrO2/SAPO-34 tandem catalyst in the direct synthesis of olefins from CO, CO2 and CO/CO2 mixture by hydrogenation, it is interesting to establish the conditions to avoid its deactivation due to the rapid coke deposition on SAPO-34. The co-feeding of H2O and/or methanol together with H2 + CO2/CO was stu...

The direct production of C5+ hydrocarbons from CO2/CO mixtures with methanol as intermediate is an attractive alternative for the production of gasoline from CO2 and syngas derived from biomass. With this purpose, the performance of CuO-ZnO-ZrO2 (CZZ), In2O3-ZrO2 (IZ) and ZnO-ZrO2 (ZZ) metallic oxides was compared by using them in tandem with a HZS...

The sustained rise in greenhouse gas emissions is increasingly becoming an important issue in the society, as these are the main cause of the climate change, especially the CO2. The chemical industry is the area with higher CO2 emissions, making the optimization of the main processes of this industry a current challenge. Among others, by reducing C...

As a consequence of the poor implantation of sanitation systems, more than 80% of the wastewater from human activity is dumped, which poses a threat to public health and generates water stress. In contrast, its depuration and reuse for irrigation improves the efficiency of the water management cycle and reduces the use of fresh water. In the contex...

Hezegune eraikiak ur grisen tratamendurako sistema merkeak, instalatzeko errazak eta jasangarriak dira, ohiko kutsatzaileak eliminatzeko gaitasun handia dutelako. Gainazaleko eta gainazal azpiko fluxuko erakoak dira hezegune eraiki mota nagusiak, azkenak hondakin uren tratamendurako eraginkorragoak izanik. Bakoitzaren hoberena aprobetxatzeko gero e...