| http://www.w3.org/ns/prov#value | - Acids which may be used as catalyst include Lewis acids such as, but not limited to, BF3 and complexes of BF3 with oxygenates such as ethers, esters, alcohols; and AlCl3, HCl, HF, HBr, H2 SO4, H3 PO4, P2 O5, SO3, SnCl4, FeCl3, ZnCl2, TiCl4, SbCl5, large and medium pore acidic zeolites such as H-ZSM-5, H-ZSM-11, H-ZSM-12 and acidic Y zeolite; and organic acids such as R--SO3 H where R is a polymeri
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