Synthesis of mesoporous aluminophosphates impregnated with metals and their application in gas oil desulphurization by adsorption
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Mesoporous materials based on aluminophosphates and silicates have been synthesised and impregnated with different loadings of transition metals such as Ag, Cu and Ni. These materials have been characterised and tested as selective adsorbents for the desulphurization of light cycle oil (LCO) by liquid adsorption. The polarity of the adsorbent matrix showed a positive effect on desulphurization, leading the impregnated aluminophosphates to higher adsorption capacities than the silicates. Among the transition metals tested, Ag-impregnated materials showed the best results followed by Cu and Ni. The aluminophosphate synthesised using pluronic F-127 block copolymer impregnated with a 5% of Ag (MFAP-5Ag) presented the best adsorption results with a maximum adsorption capacity of 11.36 mg S/g of adsorbent (equilibrium experiments), and breakthrough and saturation capacities of 4.25 mgS/g and 7.06 mgS/g, respectively (dynamic experiments).
KeywordsAdsorption Capacity Mesoporous Material Maximum Adsorption Capacity High Adsorption Capacity Cooperative Adsorption
List of symbols
Sulphur concentration, ppmw
Fractional bed utilisation; defined as qbr/qsat
Equilibrium constant, ppm−n; parameter defined in Eq. 1
Langmuir-Freundlich exponent; parameter defined in Eq. 1
Adsorption capacity, mg g−1
Adsorption capacity from the isotherm at a given concentration, mg g−1
Maximum adsorption capacity, mg g−1; parameter defined in Eq. 1
Degree of desulphurization, %
Subscripts and superscripts
Financial support from E.U. and Comunidad Autónoma de Madrid through the projects FEDER European Project 2FD1997-1873 and CAM 07 M/0056/2001 is gratefully acknowledged.