Carbon nanofibers based copper/zirconia catalysts for carbon dioxide hydrogenation to methanol: Effect of copper concentration

摘要

Highlights?A novel CNFs based Cu/ZrO2catalyst for CO2hydrogenation to methanol was investigated.?The efficiency of the catalyst was influenced by Cu content.?Efficient CO2conversion recorded at relatively low reaction temperature.?N2O chemisorptions and activity data revealed the dependency of methanol synthesis rate on Cu surface area.AbstractA series of novel bimetallic copper/zirconia carbon nanofibers supported catalysts with different Cu contents (5–25?wt%) were synthesized via deposition precipitation method. The physicochemical characterization of the calcined catalysts was carried out by X-ray diffraction, inductively coupled plasma optical emission spectroscopy, N2adsorption–desorption, N2O chemisorption, temperature programmed reduction, X-ray photoelectron spectroscopy, high resolution transmission electron microscopy and temperature programmed CO2desorption. Structure-reactivity correlation for catalytic hydrogenation of CO2to methanol was discussed in details. Reaction studies revealed 15?wt% as optimum Cu concentration for CO2conversion to methanol with CO2/H2feed volume ratio of 1:3. Cu surface area was found to play a vital role in methanol synthesis rate. CO2conversion was observed to be directly proportional to the number of total basic sites. A comparative study of this novel catalyst with the recently reported data revealed the better CO2conversion at relatively low reaction temperature.]]>