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Strategies to Enhance the Catalytic Performance of ZSM-5

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Strategies to Enhance the Catalytic Performance of ZSM-5 ( strategies-enhance-catalytic-performance-zsm-5 )

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cracking was over 90% after reaction for 11.4 h, but that of the conventional ZSM-5 zeolite was 35% (Figure 9). Jiang et al.[83] firstly prepared the hydrophilic carbon to enhance the dispersion in water by sodium hypochlorite solution treatment. Then the hydrophilic carbon was used as the hard template to prepared ZSM-5 zeolite with uniformed mesopores (Figure 10). Activated carbon (AC) Cawtaalystsa2ls0o17,a7p, 3p6l7ied in the preparation hierarchical ZSM-5 zeolite by embedding within the1z3eoof l3i1te crystals followed by combustion [84]. Catalysts 2017, 7, 367 13 of 29 Catalysts 2017, 7, 367 13 of 29 Figure 9. N2 adsorption–desorption isothermals and pore size distribution of calcined HZSM-5: (a,b) Figure 9. N2 adsorption–desorption isothermals and pore size distribution of calcined HZSM-5: Figure 9. N2 adsorption–desorption isothermals and pore size distribution of calcined HZSM-5: (a,b) HTS method; and (c,d) SAC method; and (e) conversion of n-decane cracking over HZSM-5 as a (a,b) HTS method; and (c,d) SAC method; and (e) conversion of n-decane cracking over HZSM-5 as HTS method; and (c,d) SAC method; and (e) conversion of n-decane cracking over HZSM-5 as a function of TOS. HTS-x or SAC-x, “x” denotes the percentage of mass ratio of CNTs to TEOS [71]. a function of TOS. HTS-x or SAC-x, “x” denotes the percentage of mass ratio of CNTs to TEOS [71]. function of TOS. HTS-x or SAC-x, “x” denotes the percentage of mass ratio of CNTs to TEOS [71]. Copyright Royal Society of Chemistry, 2015. Copyright Royal Society of Chemistry, 2015. Copyright Royal Society of Chemistry, 2015. Figure 10. Synthesis scheme of mesoporous ZSM-5 using hydrophilic carbon as template [83]. Figure 10. Synthesis scheme of mesoporous ZSM-5 using hydrophilic carbon as template [83]. Copyright Elsevier, 2016. Figure 10. Synthesis scheme of mesoporous ZSM-5 using hydrophilic carbon as template [83]. Copyright Elsevier, 2016. Copyright Elsevier, 2016. Although hard-template method is an effective method to prepare hierarchical ZSM-5 zeolite Although hard-template method is an effective method to prepare hierarchical ZSM-5 zeolite and adjust the texture properties by varying the number of hard templates, large number of hard and adjust the texture properties by varying the number of hard templates, large number of hard templates is necessary to generate enough mesopores. Besides, much energy would cost to burn out templates is necessary to generate enough mesopores. Besides, much energy would cost to burn out the hard templates. Overall, the hard-template method is costly and it is still at the stage of the hard templates. Overall, the hard-template method is costly and it is still at the stage of laboratory study. laboratory study. 3.2. Double Templating with Soft-Template Method 3.2. Double Templating with Soft-Template Method

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