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The above results provide objective evidence that the presence of mesopores in zeolite crystals can facilitate the transport of molecules by more paths, shortened diffusion length and the less diffusion resistance, attributed to the introduction of mesoporous into Beta zeolite. p-xylene m-xylene o-xylene T=333K p-xylene m-xylene o-xylene 4 3 2 1 0.0 0.1 0.2 0.3 0.4 0.5 32 28 24 20 16 0.0 0.1 0.2 0.3 0.4 0.5 Mesopore volume (cm3/g) Mesopore volume (cm3/g) Figure 6. Effective diffusivities at different temperatures and activation energy of Figure 6. Effective diffusivities at different temperatures and activation energy of xylene xylene isomers as the function of mesopore volume in Beta zeolite samples. isomers as the function of mesopore volume in Beta zeolite samples. 3. ExperimentalSection 3. Experimental Section 3.1. Materials and Characterization 3.1. Materials and Characterization The mesoporous Beta zeolite samples used in this work were hydrothermally The mesoporous Beta zeolite samples used in this work were hydrothermally synthesized by employing synthesized by employing organfunctioned nano-silica as silicon source, which was organfundcetisocnriebdednainot-hseilpicraevaisosuislipcoanpesro[u3r8c]e.,Fwirhsitclyh, wfuamseddescilricbaed(Aienrothseilp2r0e0v,iDouesgupsaspae,rM[3a8rl],. Firstly, fumed sNilRicWa, G(Aeremroasnily)2w0a0s, orDgeagnuicssfau,ncMtiaornle,dNwRitWh ,phGeneyrmlaamniyn)opwroapsylo-trgimaneitchofxuynsciltaionneed with (PHAPTMS, Aldrich, Saint Louis, MO, USA), then obtained organo-silylated phenylaminopropyl-trimethoxysilane (PHAPTMS, Aldrich, Saint Louis, MO, USA), then obtained nano-SiO2 was used as silicon source, according to the molar composition of Al2O3: 38 org-SiO2: 1.5 Na2O: 10 TEAOH: 532 H2O, three mesoporous Beta zeolite samples with different mesoporosities were synthesized by adjusting silanization degree of nano-silica, and coded as Beta-n (n = 1, 2, 3). The corresponding microporous Beta zeolite was synthesized by applying nano-silica without silanization under the same composition and conditions, and denoted Beta-0 as a reference. X-ray powder diffraction (XRD) patterns were examined using a SHIMADZU XRD-6000 diffractometer (Shimadzu, Nakagyo-ku, Kyoto, Japan) operating at 40 kV and 30 mA, which employed Ni-filtered and Cu-Kα radiation with the step of 0.02◦ and counting time of 10 s. Nitrogen adsorption/desorption isotherms of the samples at 77 K were gained on a Quantachrome Quadrasorb SI gas adsorption analyzer (Quantachrome Instruments, Boynton Beach, FL, USA). The total surface area was obtained by using the BET (Brunauer-Emmett-Teller) equation, whereas the external surface area and micropore volume were calculated by the t-plot method [39]. The total pore volume was evaluated at p/p = 0.95. The mesopore size distribution was derived from the adsorption branch of the isotherms using the density functional theory (DFT) method [40]. Scanning electron microscopy (SEM) and transmission electron microscope (TEM) images were obtained on a Hitachi S-4800II FE-SEM 251 Deff/R2(10- 4 s-1) Activation energy (kJ/mol)PDF Image | Zeolite Catalysis
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