Catalytic adsorbents obtained from municipal sludges,...

B - Operations – Transporting – 01 – J

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B01J 20/02 (2006.01) B01D 53/02 (2006.01) B01J 20/22 (2006.01) B01J 20/30 (2006.01)

Patent

CA 2621621

Industrial waste derived adsorbents were obtained by pyrolysis of sewage sludge, metal sludge, waste oil sludge and tobacco waste in some combination. The materials were used as media to remove hydrogen sulfide at room temperature in the presence of moisture. The initial and exhausted adsorbents after the breakthrough tests were characterized using sorption of nitrogen, thermal analysis, XRD, ICP, and surface pH measurements. Mixing tobacco and sludges result in a strong synergy enhancing the catalytic properties of adsorbents. During pyrolysis new mineral phases are formed as a result of solid state reaction between the components of the sludges. High temperature of pyrolysis is beneficial for the adsorbents due to the enhanced activation of carbonaceous phase and chemical stabilization of inorganic phase. Samples obtained at low temperature are sensitive to water, which deactivates their catalytic centers.

L'invention concerne des adsorbants dérivés de déchets industriels, obtenus par pyrolyse de boues d'égout, de boues métalliques, de boues d'huiles usées et de déchets de tabac dans une combinaison donnée. Les matières sont utilisées comme supports pour extraire le sulfure d'hydrogène à l'ambiante en présence d'humidité. Les adsorbants initiaux et dégagés après les tests de claquage sont caractérisés par sorption d'azote, analyse thermique, XRD, ICP et mesures superficielles de pH. Le mélange de tabac et de boues crée une forte synergie augmentant les propriétés catalytiques des adsorbants. Pendant la pyrolyse, de nouvelles phases minérales se forment en réaction à l'état solide entre les composants des boues. Une pyrolyse à haute température est bénéfique pour les adsorbants, vu l'activation accrue de la phase carbonée et la stabilisation chimique de la phase inorganique. Des échantillons obtenus à basse température sont sensibles à l'eau qui désactive les centres catalytiques.

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