Qian WANG1; Lei WANG2; Hui WANG1; Zengxi LI1; Xiangping ZHANG2; Suojiang ZHANG2; Kebin ZHOU1
Source Publicationfrontiersofchemicalscienceandengineering
AbstractA series of SAPO-34 molecular sieves with different SiO_2/Al_2O_3 ratios have been synthesized for the methanol-to-olefin (MTO)reaction.Their physico-chemical properties are characterized by various techniques such as X-ray diffraction (XRD),scanning electron microscopy(SEM),energy dispersive spectroscopy (EDS),Fourier transform infrared spectroscopy (FT-IR)and N2 adsorption-desorption.The results are compared with those of the commercial HZSM-5,which show that the crystallinity and particle diameter of SAPO-34 as well as HZSM-5 increase with SiO_2/Al_2O_3 ratio.The variation of BET surface area of SAPO-34 is different from that of HZSM-5 and the sample with SiO_2/Al_2O_3 ratio of 0.4 exhibits the highest BET surface area.FT-IR spectra indicate that HZSM-5 has both Bronsted and Lewis acid sites and Bronsted acid sites are stronger,whereas SAPO-34 samples are dominated only by Lewis acid sites.When the SiO_2/Al_2O_3 ratio increases,propylene and butylenes become the predominant product of the MTO reaction over HZSM-5.In contrast,the main products of this reaction catalyzed by SAPO-34 are ethylene and propylene.According to the product distribution,the reaction mechanism over HZSM-5 catalysts is proposed.
Document Type期刊论文
Recommended Citation
GB/T 7714
Qian WANG,Lei WANG,Hui WANG,et al. effectofsi02ai2o3ratioontheconversionofmethanoltoolefinsovermolecularsievecatalysts[J]. frontiersofchemicalscienceandengineering,2011,5(1):79.
APA Qian WANG.,Lei WANG.,Hui WANG.,Zengxi LI.,Xiangping ZHANG.,...&Kebin ZHOU.(2011).effectofsi02ai2o3ratioontheconversionofmethanoltoolefinsovermolecularsievecatalysts.frontiersofchemicalscienceandengineering,5(1),79.
MLA Qian WANG,et al."effectofsi02ai2o3ratioontheconversionofmethanoltoolefinsovermolecularsievecatalysts".frontiersofchemicalscienceandengineering 5.1(2011):79.
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