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- W57326819 abstract "The minerals alunite and jarosite are members of a family of complex basic sulfates of aluminum and iron. The alunite-type structure allows for a myriad of crystal chemical substitutions. Synthetic crystalline catalyst precursors were prepared which contained Cr+3and V+3substituted for aluminum and iron octahedra and [PO4], [VO4], and [MoO4] substituted for [SO4] tetrahedra in the crystal structure. Crystalline alunite-type compositions are readily synthesized at 100°C by addition of a base to a metal sulfate solution and refluxing for 8-24 hours. The crystalline products are calcined to produce amorphous hydrocarbon conversion catalysts for alkylation, isomerization, hydrogenation, and dehydrogenation reactions. Control of catalyst composition and structure is achieved in the precursor crystalline phase and maintained to some degree in the relict calcined catalyst. The Friedel-Crafts-type catalysts derived from alunite structures are amorphous non-stoichiometric aluminosulfate compositions with a specific SO4/M2O3 mole ratiorange of 0.4 to 0.7, whereas the crystalline precursor has a SO4/M2O3 ratio of 1. 5. Benzene conversions of 50 mol % were achieved in one hour at ambient conditions in a propylene-benzene alkylation screening test. Iron oxide based compositions derived from ammonium jarosite and substituted jarosite-type compositions are active dehydrogenation catalysts. Activity comparable to a commercial catalyst was observed in the dehydrogenation of ethylbenzene to styrene reaction under commercial reaction conditions." @default.
- W57326819 created "2016-06-24" @default.
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- W57326819 date "1976-01-01" @default.
- W57326819 modified "2023-09-27" @default.
- W57326819 title "Hydrocarbon Conversion Catalysts Derived from Synthetic Alunite-Type and Jarosite-Type Crystal Structures" @default.
- W57326819 cites W2921671064 @default.
- W57326819 doi "https://doi.org/10.1016/s0167-2991(08)63943-9" @default.
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