【摘要】 以N,N,N-三甲基金刚烷氢氧化铵（TMAdaOH）为模板剂合成SSZ-13分子筛,探讨有机季铵碱四甲基氢氧化铵（TMAOH）取代体系中的氢氧化钠（NaOH）对SSZ-13分子筛合成的影响,采用X射线衍射（XRD）、扫描电子显微镜（SEM）、傅里叶红外光谱（FT-IR）、热重-微商热重（TG-DTG）、NH₃程序升温脱附（NH₃-TPD）和N₂吸附-脱附等手段对合成样品进行表征,分析合成凝胶的硅/铝比对SSZ-13分子筛的结晶度、比表面积、酸量等的影响,并考察了SSZ-13分子筛在甲醇制烯烃（MTO）反应中的催化性能。结果表明,当有机碱TMAOH完全取代NaOH时,合成样品的结晶度从92.68%提高至108.75%,且合成体系的硅/铝比（n（SiO₂）/n（Al₂O₃））范围可以显著拓宽（33～100）,合成产物的硅/铝比也相应提高,比表面积可增大至约800 m²/g,强酸量减少,SSZ-13分子筛样品在MTO催化反应中表现出了更长的寿命和更高的双烯（乙烯+丙烯）选择性。更多还原

【Abstract】 Effects of the replacement of NaOH by tetramethylammonium hydroxide（TMAOH） on the synthesis of SSZ-13 molecular sieve were investigated in the presence of the N,N,N-trimethyl-1-adamantanammonium hydroxide（TMAdaOH） as structure-directing agent. The influences of silica/alumina ratios in synthetic gel on the structural, textural and acidic properties of SSZ-13 molecular sieve were investigated. The obtained SSZ-13 molecular sieves were characterized by X-ray diffraction（XRD）, scanning electron microscopy（SEM）, Fourier transform infrared（FT-IR）, thermogravimetry-derivative thermogravimetry（TG-DTG）, NH₃-temperature programmed desorption（NH₃-TPD） and N₂ physisorption techniques. The catalytic performance of the SSZ-13 molecular sieves was evaluated by methanol to olefins（MTO） reaction. Results demonstrate that the crystallinity of the product significantly increases from 92.68% to 108.75% when the organic alkali TMAOH completely take place of the inorganic NaOH. The silica/alumina ratio in synthesis gel ranges from 33 to 100, thus accordingly enhancing the silica/alumina ratio of molecular sieves. Meanwhile, these materials possess large BET surface area of 800 m²/g and low strong acid amount, therefore exhibit longer catalytic lifetime and higher light olefin（ethylene + propylene） selectivity than conventional SSZ-13 catalysts in MTO reaction.更多还原