Effects of calcination temperatures on the catalytic performance of Rh/Al2O3 for methane partial oxidation to synthesis gas

摘要: Abstract Comparative studies using high temperature in situ Raman spectroscopy, TPSR, pulsed reactions of CH 4 , H 2 -TPR and O -TPD techniques were carried out on Rh/Al 3 calcined at 600 900 °C to elucidate the effect calcination temperatures nature Rh species catalysts its relationship with catalytic performance for partial oxidation methane (POM) synthesis gas. The results indicate that significant difference POM can be attributed formation rhodium different after samples air above temperatures. Calcining a sample caused not only more than 81% irreducible by below 600 °C, but also affected redox property RhOx reducible 250 °C. Compared those catalyst possesses stronger Rh–O bonds higher oxygen affinity. These factors would affect concentration two under reaction conditions consequently primary products reaction. TPSR characterizations over that, fully oxidized form are mainly responsible complete CO O. abruptly changed state when starts. suggest which may substitute Al site was formed 900 °C. This is difficult reduced metal 600 °C.