A process for alkylation of olefin-containing gases with low molecular weight branched alkanes to generate alkylate. The process involves the use of solid acid catalysts as alkylation catalysts. In a specific embodiment, the process employs a three-phase catalytic reactor where olefins present in the gas are reacted, preferably to extinction, with a large excess of liquid branched alkane.
 This invention was funded at least in part by United States Government funding through the Department of Energy contract number DE-FG03-02ER83550. The United States government has certain rights in this invention.