Study On The Preparation And Supported Catalysts Property Of In-situ Al-pillared Moritmorillonite

The low price and rich reserves of montmorillonite have attracted theresearchers’ attention. In the past20years, pillared interlayered clays (PILCs) havebeen widespread and successfully applied in the fields of plant growth, pollutanttransfer, nutrient cycling and petroleum engineering due to its high permanentporosity, excellent thermal stability and catalytic feature. In recent years, manyresearchers were committed to proposing innovative pillared methods, which canimprove the efficiency of pillared montmorillonite Accoordingly, it’s significant forstudying on the preparation and application of pillared montmorillonite, which canachieved the goal of reducing preparation time and water conservation.In this paper, a facile in-situ pillaring method was developed forAl-pillared-MMT(Al-(PEG)In-MMT). And the properties of Al-(PEG)In-MMT havebeen investigated systematically, which provided the experimental fundaments andtheoretical evidences for the industrial production of Al-pillared-MMT. Then we usethe products for the further development of its application as a catalyst.In the second chapter, PEG400is employed as the layer extending agents, whichcould promote the forming of Al137+in the layer of MMT. And a facile pillaringmethod for Al-pillared montmorillonite (Al-pillared-MMT) has been established firsttime by the in-situ formation polyoxocation [Al13O4(OH)24(H2O)127+] in the interlayerof montmorillonite(MMT). This method prepared a more ordered or highercrystallinity, good thermal stability Al-pillared-MMT. The amount of PEG400andthe ratio of Al3+/OH-, which affects the synthesis of Al-(PEG)In-MMT weresystematically examined. Action of layer extending agent PEG400was discussed.Moreover, according to the characterization, the formation mechanism ofAl-(PEG)In-MMT was concluded. The in-situ pillared method not only successfullysynthesized the Al-pillared-MMT, but also the Al-pillared-MMT was prepared using minimum expenditure of time and water.In the third chapter, Ni and Mo were supported on an Al-pillared MMT by theimpregnation method. The NiMo/Al-MMT hydrotreating catalysts were synthesized.The achieved catalysts have been investigated by XRD, FTIR, TGA. Thehydrotreating products of thiophene were analyzed in detail. The results showed thatthe mainly products of thiophene was C4H10. And the conversion rate of thiophenereached77.5%. The hydrotreating reaction temperature, which affected theconversion rate of thiophene was preliminary studied. And the optimal hydrotreatingreaction temperature was400oC.