Poresize distribution

The catalysts used in this CCR commercial service must meet several stringent physical property requirements. A spherical particle is required so that the catalyst flows in a moving bed down through the process reactors and regenerator vessel. These spheres must be able to withstand the physical abuse of being educated and transferred by gas flow at high velocity. The catalyst particles must also have the proper physical properties, such as particle size, porosity, and poresize distribution, to achieve adequate coke combustion kinetics. 

Furthermore, poresize distribution of many column packings is rather wide and poor recovery is frequently encountered due to entrapment of large molecules in the porous interior. 

FIGURE 2.8 (a) The XRD patterns of micelle template silicaMTS-l(CTAB/MTCP=0.5). MTS-2 (CTAB/MTCP=1). MTS-3(CTAB/trimethylbeiizene=l) (b) Poresize distribution studies compared with Al-MCM-41 material [19]. 

Confirm that the liposomes have an adequate size and size distribution, by DFS. Repeat extrusion with the smallest poresized membrane, if the results are not satisfactory (see Note 7). 

The textural characterization of the supports and catalysts pore size distribution, pore volume, and surface areas were determined by use of mercury intrusion porosimetry using a Micromeritics Poresizer 9320 and nitrogen gas adsorption/desorption isotherms carried out on a Micromeretics ASAP 2000 respectively. For the porosimetiy analysis a contact angle of 140° and surface tension of480mNm for mercury were assumed. 

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