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On the other hand, desilication proceeded by a controlled extraction of Si from the zeolite framework in alkali medium has been proven an efficient method to induce significant mesoporosity [18,19]. Recently, we found that the catalytic stability in n-hexane cracking can be improved by alkali treatment of ZSM-5 due to the formation of mesopores, which facilitates the diffusion of the coke precursor [20]. In addition, LAS were generated by higher concentrated NaOH treatment, leading to the increase in the selectivities to benzene, toluene and xylene (BTX) at high reaction temperatures (ě873 K). However, selectivity to propylene did not increase. Similarly, Bjorgen et al. reported that product distribution and catalytic stability in the methanol to gasoline (MTG) reaction were also altered dramatically with desilication of ZSM-5, as a result of formation of LAS [21]. Up to now, there are many reports on the effect of desilication of ZSM-5 zeolite on the catalytic performance in various reactions [20–23]. However, only a few papers on the desilication of Beta zeolite were reported [24,25]. Moreover, the effect of desilication of Beta zeolite on the catalytic performance of alkane cracking has never been reported. In this study, the dealuminated and desilicated H-Beta zeolites (hereinafter, designated as “HB”) were prepared via acid and alkali treatment, respectively. The effects of dealumination and desilication on the physicochemical properties (including porosity and acidity) and catalytic properties (including activity, selectivity and catalytic life) of HB zeolites in the cracking of n-hexane as a model compound of naphtha were investigated. In addition, as a control, the physicochemical properties and catalytic properties of Al-rich HB were investigated. 2. ResultsandDiscussion 2.1. A Summary of Catalysts’ Characterization The acid-treated HB samples were denoted as HB(77)-NT(a M, b h), where a and b were the HNO3 concentration and treatment time, respectively. The alkali-treated HB samples were denoted as HB(77)-AT(c M), where c was the NaOH concentration. The alkali-acid-treated samples were denoted as HB(77)-AT(c M)-NT (d M), where d was the HNO3 concentration. 2.1.1. XRD Figure 1 shows the XRD patterns of the Al-rich HB(12), HB(77) and post-treated HB zeolites. Both of the HB(12) and HB(77) had a pure Beta phase and relatively high crystallinities (Figure 1A). Little change was observed in the diffractions after HNO3 treatment, regardless of the HNO3 concentration and treatment time (Figure 1A), meaning that the structure remained even after the acid treatment. 77PDF Image | Zeolite Catalysis
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