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The steam-gasification of petcoke using concentrated solar radiation is proposed as a viable alternative to solar hydrogen production. Petcoke is major solid byproduct from the processing of heavy and extra-heavy oils using delay-coking technology. This report summarizes the major accomplishments to develop a cheap and efficient feeding of petroleum coke by coke water slurries without the need of a carrier gas. The samples were Delayed coke of different granulometries, in particular from 1,8 to 200 mm (as received). In order to analyse the flow properties of the slurries, some tests were conducted to measure the viscosity of the samples. Then, the petcoke water slurries were injected into the reactor to study the gasification process. In these experiments, some operational parameters were: molar ratio from 2 to 3 (water/coke), temperature up to 1000 deg C, residence times from 5 to 9 s. In those conditions, the coke is converted primarily to CO, H2, CO2 and small amounts of methane. Concentration of outlet gases of about 30 - 50 of H2; 15 - 20 of CO, 10 - 15 CO2, 1 - 2 % CH4 were obtained with Xcoke of about 65 to 85 %.