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- W43433174 abstract "Abstract A high temperature interaction between HZSM-5 and solid NiCl 2 , NiSO 4 , Ni(CH 3 COO) 2 and NiO was investigated. For NiCl 2 , disaggregation of the salt is complete at 770 K with evolution of gaseous hydrochlorid acid, resulting in solid–solid ion exchange of Ni ions into the zeolite cationic sites at the expense of the strong acid skeletal OH groups. The heat treatment of the zeolite with NiSO 4 above 670 K leads to a decrease in the number of skeletal OH groups to approximately half the original number. Moreover, no evolution of acid or its decomposition products is observed. Ni(CH 3 COO) 2 behaves differently. No ion–change (even in a wet paste) occurs up to the salt decomposition temperature (520 K). NiO formed at higher temperatures also does not interact with the skeletal OH groups. The described high–temperature solid–solid ion exchange between HZSM-5 and NiCl 2 was used successfully for the incorporation of Ni 2+ into the zeolite cationic sites. Subsequent reduction of these ions by hydrogen yields well–dispersed metallic nickel which is active in the isomerization of C 8 aromatic hydrocarbons." @default.
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- W43433174 date "1989-01-01" @default.
- W43433174 modified "2023-10-11" @default.
- W43433174 title "Preparation of Nihzsm-5 Catalyst for Isomerization of C8 Aromatics. Solid-State Incorporation of Nickel" @default.
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- W43433174 doi "https://doi.org/10.1016/s0167-2991(08)60991-x" @default.
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