A green route to synthesize HZSM-5 zeolites for the coreaction of n-heptane and methanol to light olefins
A green route to synthesize HZSM-5 zeolites for the coreaction of n-heptane and methanol to light olefins
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正庚烷与甲醇共反应制低碳烯烃HZSM-5沸石的绿色合成路线
DOI：
10.1007/s10934-022-01359-2
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发表时间：
2022-10
影响因子：
2.6
通讯作者：
Min Zhou
中科院分区：
文献类型：
--
作者：
Rui Feng;Bao Liu;Xiaoyan Hu;Xinlong Yan;Min Zhou
H型HZSM-5分子筛是重要的工业原料。然而，它们的直接合成仍然具有挑战性，因为它们必须在钠碱性溶剂的存在下合成。本文中，我们报告氢氧化氨可以作为一种碱源的直接合成的HZSM-5沸石分子筛的蒸汽辅助结晶（SAC）和动态搅拌结晶（DAC）。我们证明了硅源和铝源的传质对结晶过程至关重要;因此，DAC的HZSM-5的结晶速率比SAC快得多。正庚烷与甲醇共反应的催化性能表明，正庚烷的裂解产物参与了甲醇的双循环反应，提高了低碳烯烃的收率，但催化剂的寿命因结焦速率加快而缩短。本研究为HZSM-5分子筛的合成开辟了一条绿色路线，为提高低碳烯烃的收率提供了新的思路。
H-form HZSM-5 zeolites are important industrial materials. However, their direct synthesis remains challenging since they have to be synthesized in the presence of a Na alkaline solvent. Herein, we report that ammonia hydroxide can serve as an alkaline source for the direct synthesis of HZSM-5 zeolites by steam-assisted crystallization (SAC) and dynamic agitation crystallization (DAC). We demonstrated that the mass transfer of silicon and aluminum sources is crucial for the crystallization process; therefore, the crystallization rate of HZSM-5 by DAC is considerably faster than that by SAC. The catalytic performances of the coreaction of n-heptane and methanol show that the cracking products of n-heptane participate in the dual-cycle reactions of methanol, leading to an enhanced yield of light olefins but a reduced catalyst lifetime because of an accelerated coking rate. This study contributes a green route to the synthesis of HZSM-5 zeolites and provides insight for improving the yield of light olefins.
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