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Study on effect of different calcination atmospheres on properties of acrylic acid catalysts
Received date: 2024-03-11
Online published: 2024-09-26
The composite oxide precursors containing Mo-V were prepared by solution method，and the precursors after spray drying were calcined under different atmospheres（5%H2+95%N2，N2，5%O2+95%N2，air and O2） to obtain Mo-V-W-Sb series composite metal oxide catalysts.And they were applied to the vapor phase oxidation of acrolein to acrylic acid.The catalysts were characterized by inductively coupled plasma-optical emission spectrometer（ICP-OES），X-ray fluorescence spectrometer（XRF），X-ray diffractometer（XRD），nitrogen physical adsorption analyzer，transmission electron microscope（TEM），temperature program reduction（H2-TPR） and potentiometric titrator.The experimental results indicated that the calcination atmosphere had a significant impact on the crystal structure，physicochemical properties，and catalytic performance of the Mo-V-W-Sb series catalysts.When the precursor was thermotreated in a weakly oxidizing atmosphere（5%O2+95%N2），it was beneficial to prepare a catalyst with pure Mo3VO11+x active phase，relatively larger specific surface area（6.8 m2/g），moderate crystallinity and reduction temperature（about 415 ℃），and the most suitable n（V5+）/［n（V3+）+n（V4+）+ n（V5+）］=0.019.Furthermore，this catalyst exhibited the best reaction performance in the oxidation of acrolein to acrylic acid，with a conversion rate of 99.5% acrolein and a yield of 88.7% acrylic acid.
WANG Jing , SU Jin , ZHANG Lijie , ZHOU Peng , SUN Yanmin , LI Jia . Study on effect of different calcination atmospheres on properties of acrylic acid catalysts[J]. Inorganic Chemicals Industry, 2024 , 56(9) : 164 -170 . DOI: 10.19964/j.issn.1006-4990.2024-0139
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