Prozesu Katalitikoak eta Hondakinen Balioztatzea

Ikerketa Taldea

Abstract: Carbon-based adsorbents were prepared by the physical activation of sewage sludge with CO2 through an integrated method (without a precarbonization stage). The activation was conducted at different tem- peratures (600e1000  C), and the effect of the acid washing, performed either before or after the physical activation, was investigated. From the standpoint of textural...

Abstract: A deactivation kinetic equation for the conversion of dimethyl ether (DME) to olefins (DTO process) has been established. The catalyst has been prepared with a HZSM-5 zeolite (SiO2/Al2O3 ratio of 280) agglom- erated with boehmite (mesoporous matrix of weak acidity). The experimental data have been obtained in an isothermal fixed bed reactor in a wide range of operating...

Abstract: The effect of O2 content in the oxidative steam reforming (OSR) of raw bio-oil has been studied, and the kinetic behavior, particularly deactivation, has been compared between two catalysts (Ni/La2O3-αAl2O3 and Rh/CeO2-ZrO2). The experiments have been carried out in an apparatus with two steps in series: (1) thermal treatment (at 500 °C, for the controlled deposition of...

Abstract: A thermodynamic approach of the synthesis processes of methanol and of DME from H2 + CO + CO2 has been conducted, in order to compare the feasibility of incorporating CO2 in the feed of both processes. The effects of reaction temperature (200–400 °C), pressure (10–100 bar) and CO2/(CO + CO2) ratio in the feed on the CO2 conversion, yield and selectivity of oxygenates (methanol...

Abstract: The study has focused on the regenerability of the CuO–ZnO–MnO/ SAPO-18 (CZMn/S) bifunctional catalyst used in the direct synthesis of dimethyl ether (STD process) from H2 ? CO ? CO2 feeds. The runs have been conducted in a fixed bed reactor under the following conditions: 250–300 °C; 10–40 bar; 1.25–10.18 gcat h mol-C 1; time on stream, 5–30 h; CO2/CO molar ratio, 0–1; feeding...

Abstract: An HZSM-5 zeolite was dealuminated by steaming with its self-adsorbed water at mild temperatures (300, 400 or 500 °C), characterized and tested in the transformation of 1-butene into propylene. The structural, porous-surface and acidic properties of the catalysts (unmodified and steamed) were characterized using N2 adsorption-desorption isotherms, tert-butylamine...

Abstract: A device and methodology have been developed for measuring the circulation rate of fine particles in conical spouted beds. A comparison with particle tracking shows the method is appropriate. The influence of the spouted bed variables have been investigated on the average cycle time, maximum cycle time and circulation rate. DOI: 10.1016/j.powtec.2017.01.040

Abstract: The deactivation of a composite catalyst based on HZSM-5 zeolite (agglomerated in a matrix using boehmite as a binder) has been studied during the transformation of dimethyl ether into light olefins. The location of the trapped/retained species (on the zeolite or on the matrix) has been analyzed by comparing the properties of the fresh and deactivated catalyst after runs at...

Abstract: The composition of the carbonaceous deactivating species (coke) deposited on a Pt and Pd supported P-containing activated carbon catalyst has been studied. These deactivating species were deposited on the catalyst during the hydrocracking of scrap tire pyrolysis oil at 400–500 °C, and it has been selectively characterized by means of temperature-programmed oxidation (TPO),...

Abstract: This work compares different methodologies for calculating the kinetic parameters of coke combustion, employed for catalyst regeneration, using thermogravimetric methods. A reference fluid catalytic cracking (FCC) spent catalyst was used as a representative example of the deactivated catalyst for the combustion runs, pre-used in the cracking of a vacuum gas oil at 773 K and 3...