N. Idaka et al., Role of potassium added to Ce/NaZSM-5 catalyst in partial oxidation activity of benzyl alcohol, PHYS CHEM P, 3(10), 2001, pp. 1918-1924
The vapor-phase catalytic oxidation of benzyl alcohol was carried out over
cerium-impregnated NaZSM-5 (Ce/NaZSM-5) and K-added Ce/NaZSM-5 catalysts. T
he main products were benzaldehyde and carbon dioxide, together with trace
amounts of benzene and toluene. The effect of the added K on the catalytic
activity in the benzyl alcohol oxidation was different by the amount of sup
ported Ce (Ce: 1.4x10(-2)-7.1x10(-1) mmolg(NaZSM-5)(-1), low Ce (Ce-L): sim
ilar or equal to 10(-2) mmol g(NaZSM-5)(-1), high Ce (Ce-H): similar or equ
al to 10(-1) mmol g(NaZSM-5)(-1)). The BET surface area and the temperature
-programmed oxidation (TPO) of the fresh and the used K-added Ce/NaZSM-5 ca
talysts was measured to obtain information on the role of the added K in th
e catalytic activity of the benzyl alcohol oxidation. The amount of O-2 upt
ake of the pre-reduced K-added Ce-H/NaZSM-5 catalysts was also measured to
estimate the ability to store the oxygen species on the cerium. The main ro
le of potassium added to the high Ce-loaded NaZSM-5 (Ce-H/NaZSM-5) catalyst
was to prevent the build-up of coke-like materials on the catalyst surface
during the oxidation and so prolong the catalytic life.