Journal of the Chemical Society - Faraday Transactions p. 367 - 374 (1995)
Update date:2022-08-16
Topics:
Na, Kyutae
Okuhara, Toshio
Misono, Makoto
Skeletal isomerization of n-butane to isobutane has been studied with a flow reactor, mainly at 573 K, over caesium hydrogen salts of 12-tungstophosphoric acid (trihydrogen phosphododecatungstate), CsxH3-xPW12O40.The activity was highly dependent on the caesium content, being a maximum for x = 2.5 where the number of acid sites on the surface was greatest.The initial rate was first order with respect to the butane pressure (ca. 0.05-0.5 atm) at both 423 and 573 K on Cs2.5H0.5PW12O40*Cs2.5H0.5PW12O40 was found to be much more active and selective (83percent cf. 60percent) than SO4(2-)/ZrO2 at the steady state at 573 K.H-ZSM-5 showed a higher activity than Cs2.5H0.5PW12O40 and SO4(2-)/ZrO2 but the selectivity was only 14percent.Cs2.5H0.5PW12O40 is a promising catalyst for this reaction and the low deactivation of Cs2.5H0.5PW12O40 is probably responsible for the high catalytic activity.
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