On the formation of the acid sites in lanthanum exchanged X zeolites used for isobutane/cis-2-butene alkylation

The catalytic activity in isobutane/cis-2-butene alkylation and the fraction of strong Brønsted to total Brønsted acid sites are directly related. Catalysts with similar concentration of strong Brønsted acid sites and higher concentration of weak Brønsted sites showed shorter lifetime.