Abstract Palygorskite was used as a silicon and partial aluminum source to prepare SAPO-34 molecular sieves using diethylamine, triethylamine, morpholine and tetraethylammonium hydroxide as templates. The synthesized SAPO-34 molecular sieves were characterized by using the methods of XRD, SEM, EDS, BET, FT-IR, NH3-TPD, H2-TPR and TG. Composite catalysts of CuO-ZnO-Al2O3/SAPO-34 were prepared by mechanically mixing SAPO-34 molecular sieves with CuO-ZnO-Al2O3 and were used in the direct synthesis of light olefins via CO2 hydrogenation. The results showed that SAPO-34 molecular sieves prepared by acid-treated palygorskite using tetraethylammonium hydroxide as a template had a higher specific surface area, a greater CO2 conversion rate and higher light olefin selectivity. The CO2 conversion rate reached 53.5%, the light olefin selectivity reached 62.1%, and the yield reached 33.2% when the reaction conditions were as follows: reaction temperature 673 K, reaction pressure 3.0 MPa, volume ratio of CO2/H2 1:3 and 0.5 g composite catalyst.

中文翻译：

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坡缕石制备的 SAPO-34 分子筛在 CO2 加氢合成轻烯烃中的催化活性

摘要 以坡缕石为硅源和部分铝源，以二乙胺、三乙胺、吗啉和四乙基氢氧化铵为模板剂制备了SAPO-34分子筛。采用XRD、SEM、EDS、BET、FT-IR、NH3-TPD、H2-TPR和TG等方法对合成的SAPO-34分子筛进行表征。通过将SAPO-34分子筛与CuO-ZnO-Al2O3机械混合制备CuO-ZnO-Al2O3/SAPO-34复合催化剂，用于CO2加氢直接合成轻烯烃。结果表明，以氢氧化四乙基铵为模板剂，酸处理坡缕石制备的SAPO-34分子筛具有更高的比表面积、更高的CO2转化率和更高的轻烯烃选择性。CO2转化率达到53.5%，轻烯烃选择性达到62。