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- W191474784 abstract "Abstract The discovery of a micrcporous oxide system based not on silicates but on aluminophosphates has proved very exciting and promises great potential for tailoring catalysts. These new materials are formed by hydrothermal treatment of a reactive aluminophosphate gel, in the presence of an organic base which acts as a structure directing species. Using several templating agents 31 different micrcporous structures have been currently reported. Many of these have analogues in zeolite chemistry but several are less thermally stable structures and are unusual in having 5-ccordinate aluminium. A wide range of elements can be substituted into the framework for either Al or P. These include transition metals such as Co, Zn, Mn or Fe which substitute for Al, and elements such as Si, Ge or Ti which seem to substitute for P. Both these types of substitution produce Bronsted acid sites so that these materials can be used as catalysts in a similar way to zeolites. Methods of characterising and quantifying the number of acid sites are described. Since the acid strength of the substituted aluminophosphates depends on both the substituting atom and the structure, a wider range of catalysts is available than with the zeolites. So far, there have been few reports of particular catalytic uses for these materials but the list can be expected to grow rapidly as the potential of these new compounds is explored. This paper reviews some of the characteristics of both the substituted and unsubstituted aluminophosphates together with their potential uses as catalysts and molecular sieves." @default.
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- W191474784 date "1988-01-01" @default.
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- W191474784 title "Aluminophosphates as Possible Alternatives to Zeolites" @default.
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- W191474784 doi "https://doi.org/10.1016/s0167-2991(09)60551-6" @default.
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