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Direct evidence of time-dependent crystallization evolution of SAPO-34 and SAPO-20 zeolites directed by trimethylbenzylammonium hydroxide for microwave-assisted ethanolysis of furfuryl alcohol
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2024-03-25 , DOI: 10.1039/d4nj00875h Guanchen Wang 1 , Najla AlMasoud 2 , Taghrid S. Alomar 2 , Yasmin Nadhirah Azman 1 , Pedro Maireles-Torres 3 , Stephen Chia 4 , Joon Ching Juan 5 , Tau Chuan Ling 6 , Zeinhom M. El-Bahy 7 , Eng-Poh Ng 1
New Journal of Chemistry ( IF 2.7 ) Pub Date : 2024-03-25 , DOI: 10.1039/d4nj00875h Guanchen Wang 1 , Najla AlMasoud 2 , Taghrid S. Alomar 2 , Yasmin Nadhirah Azman 1 , Pedro Maireles-Torres 3 , Stephen Chia 4 , Joon Ching Juan 5 , Tau Chuan Ling 6 , Zeinhom M. El-Bahy 7 , Eng-Poh Ng 1
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Time-dependent crystallization evolution for synthesizing SAPO34 and SAPO-20 zeolites from a very active hydrogel is followed and reported where the XRD, FTIR, TGA/DTG, SEM/EDX, N2 adsorption–desorption and TPD-NH3 techniques are used. During the crystallization process, the hydrophobic trimethylbenzylammonium cation (BTMA+) has shown its ability as an effective structure-directing and pore filling agent. The resulting pure SAPO-34 and SAPO-20 show high crystallinity, where SAPO-34 exhibits higher porosity (393 m2 g−1, 0.24 cm3 g−1) and acidity (1.20 mmol g−1) than SAPO-20 (29 m2 g−1, 0.16 cm3 g−1, 0.02 mmol g−1), and these features are highly beneficial in the microwave-assisted ethanolysis of furfuryl alcohol. SAPO-34 shows outstanding catalytic activity (100% conversion, 72.5 ± 0.3% yield of ethyl levulinate) and its performance is much superior to that of SAPO-20 and other classical catalysts thanks to its medium pore size that induces molecular sieving effect. The spent SAPO-34 catalyst has high recyclability with stable activity, making it a superior and cost-effective catalyst for various selective petrochemical reactions.
中文翻译：
SAPO-34 和 SAPO-20 沸石在三甲基苄基氢氧化铵引导下微波辅助糠醇乙醇解的时间依赖性结晶演化的直接证据
使用 XRD、FTIR、TGA/DTG、SEM/EDX、N 2吸附-解吸和 TPD-NH 3技术，跟踪并报道了从非常活跃的水凝胶合成 SAPO34 和 SAPO-20 沸石的时间依赖性结晶演化。在结晶过程中，疏水性三甲基苄基铵阳离子 (BTMA + ) 显示出其作为有效的结构导向剂和孔填充剂的能力。所得纯SAPO-34和SAPO-20表现出高结晶度，其中SAPO-34表现出比SAPO-20更高的孔隙率（393 m 2 g -1 , 0.24 cm 3 g -1）和酸度（1.20 mmol g -1）（ 29 m 2 g -1、0.16 cm 3 g -1、0.02 mmol g -1），这些特征对于糠醇的微波辅助乙醇分解非常有益。 SAPO-34表现出出色的催化活性（转化率100%，乙酰丙酸乙酯收率72.5±0.3%），由于其中等孔径，可产生分子筛分效应，其性能远优于SAPO-20和其他经典催化剂。废SAPO-34催化剂具有高回收性和稳定的活性，使其成为各种选择性石油化学反应的优质且经济高效的催化剂。
更新日期：2024-03-26
中文翻译：
SAPO-34 和 SAPO-20 沸石在三甲基苄基氢氧化铵引导下微波辅助糠醇乙醇解的时间依赖性结晶演化的直接证据
使用 XRD、FTIR、TGA/DTG、SEM/EDX、N 2吸附-解吸和 TPD-NH 3技术，跟踪并报道了从非常活跃的水凝胶合成 SAPO34 和 SAPO-20 沸石的时间依赖性结晶演化。在结晶过程中，疏水性三甲基苄基铵阳离子 (BTMA + ) 显示出其作为有效的结构导向剂和孔填充剂的能力。所得纯SAPO-34和SAPO-20表现出高结晶度，其中SAPO-34表现出比SAPO-20更高的孔隙率（393 m 2 g -1 , 0.24 cm 3 g -1）和酸度（1.20 mmol g -1）（ 29 m 2 g -1、0.16 cm 3 g -1、0.02 mmol g -1），这些特征对于糠醇的微波辅助乙醇分解非常有益。 SAPO-34表现出出色的催化活性（转化率100%，乙酰丙酸乙酯收率72.5±0.3%），由于其中等孔径，可产生分子筛分效应，其性能远优于SAPO-20和其他经典催化剂。废SAPO-34催化剂具有高回收性和稳定的活性，使其成为各种选择性石油化学反应的优质且经济高效的催化剂。
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