蒸汽相体系下合成SAPO-34分子筛及其MTO催化性能
发布时间：2019-02-22 20:21
【摘要】：分别采用TEA(三乙胺)、DEA(二乙胺)、TEAOH(四乙基氢氧化铵)、MOR(吗啉)中的1种或2种有机胺作为模板剂,在蒸汽相体系下均可合成纯相的SAPO-34分子筛,通过XRD、SEM、NH_3-TPD、BET、XRF等手段对产物进行表征。结果表明,与水热法合成的样品HTS-SAPO-34进行对比,蒸汽相条件下的产物DGC-SAPO-34结晶度提高,粒径变小,酸强度减弱,将其用于甲醇制烯烃(MTO)催化反应时寿命可延长9.85%~96.4%,双烯(乙烯+丙烯)选择性提高0.81%~4.93%;在蒸汽相、双模板合成SAPO-34分子筛时,TEAOH部分添加既可以有效地调控产物的晶粒大小,又能充分调变酸分布,其MTO催化性能相比单一模板(TEAOH除外)所合成样品有显著的提高,该方法有利于保持较高性能,同时降低合成成本,具有重要的实际应用价值。
[Abstract]:Using one or two organic amines in TEA (triethylamine), DEA (diethylamine), TEAOH (tetraethyl ammonium hydroxide), MOR (morpholine) as template, pure phase SAPO-34 molecular sieve can be synthesized in vapor phase system. The products were characterized by NH_3-TPD,BET,XRF. The results show that compared with the sample HTS-SAPO-34 synthesized by hydrothermal method, the crystallinity of the product DGC-SAPO-34 increases, the particle size decreases and the acid strength decreases under the condition of steam phase. When used in the (MTO) catalytic reaction of methanol to olefin, the life span can be prolonged by 9.85 and 96.4.The selectivity of diene (ethylene propylene) is increased by 0.81% and 4.93%, respectively. When SAPO-34 molecular sieve was synthesized by steam phase and double template, the partial addition of TEAOH could not only effectively regulate the grain size of the product, but also fully adjust the acid distribution. The catalytic performance of MTO is significantly higher than that of the samples synthesized by single template (except TEAOH). This method is helpful to maintain high performance and reduce the cost of synthesis. It has important practical application value.
【作者单位】： 太原理工大学精细化工研究所;中国石油大学中国石油天然气集团催化重点实验室;
【基金】：国家重点基础研究发展规划“973”项目(2004Cb217806) 国家自然科学基金项目(20973123) 火炬计划项目(2014061002-01)资助
【分类号】：O643.36
本文编号：2428586
[Abstract]:Using one or two organic amines in TEA (triethylamine), DEA (diethylamine), TEAOH (tetraethyl ammonium hydroxide), MOR (morpholine) as template, pure phase SAPO-34 molecular sieve can be synthesized in vapor phase system. The products were characterized by NH_3-TPD,BET,XRF. The results show that compared with the sample HTS-SAPO-34 synthesized by hydrothermal method, the crystallinity of the product DGC-SAPO-34 increases, the particle size decreases and the acid strength decreases under the condition of steam phase. When used in the (MTO) catalytic reaction of methanol to olefin, the life span can be prolonged by 9.85 and 96.4.The selectivity of diene (ethylene propylene) is increased by 0.81% and 4.93%, respectively. When SAPO-34 molecular sieve was synthesized by steam phase and double template, the partial addition of TEAOH could not only effectively regulate the grain size of the product, but also fully adjust the acid distribution. The catalytic performance of MTO is significantly higher than that of the samples synthesized by single template (except TEAOH). This method is helpful to maintain high performance and reduce the cost of synthesis. It has important practical application value.
【作者单位】： 太原理工大学精细化工研究所;中国石油大学中国石油天然气集团催化重点实验室;
【基金】：国家重点基础研究发展规划“973”项目(2004Cb217806) 国家自然科学基金项目(20973123) 火炬计划项目(2014061002-01)资助
【分类号】：O643.36
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