25 u00b0 c the theoretical i c 4 h 10 i c 4 h 8 equilibrium ratio without removal of hydrogen is 19 1 5 3 percent conversion at 641 u00b0 k and 101 3 kpa pressure an initial enhancement of isobutene above the theoretical value was achieved at 641 u00b0 k and 90 h 1 space velocity over a mixture of 2 25 g pt al 2 o 3 catalyst and 3 48 grams titanium two cycles were carried out in the first cycle a ratio of 12 5 1 7 4 percent conversion was initially observed the ratio increasing toward the theoretical 19 1 as the titanium became saturated with hydrogen thereafter the titanium was regenerated by removing the hydrogen at 873 u00b0 k and 0 1 pa pressure following the regeneration of the titanium an initial i c 4 h 10 i c 4 h 8 ratio of 8 6 1 10 4 percent conversion was observed which again increased toward 19 1 as the titanium became saturated with hydrogen quite clearly the presence of the hydridable material titanium enhanced the conversion from alkane to alkene by 40 or more over theoretical generally hydrogen is never completely removed from the reaction mixture its concentration increasing with time as the hydridable material capacity becomes exhausted thus the amount of hydrogen in the reactor effluent varies inversely with the dehydrogenated product produced a result opposite to that expected in the absence of hydride formation the amount of hydrogen observed vs the amount expected for i c 4 h 10 without titanium present is plotted.