Synthesis of SAPO-34 catalyst with varying molar ratios of SiO2/Al2O3 and H2O/Al2O3

Publish Year: 1392
نوع سند: مقاله کنفرانسی
زبان: English
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NCNC01_554

تاریخ نمایه سازی: 14 شهریور 1392

Abstract:

Silicoaluminophosphate, SAPO-34, is known as promising molecular sieve, which is widely used in catalysis, separation processes, and is being developed for new applications, especially in the methanol-to-olefin (MTO) process. In order to examine the influence of silicon and water contents on the morphology of SAPO-34 crystal, different SiO2/Al2O3 and H2O/Al2O3 ratios of synthesis gel were prepared hydrothermally at crystallization temperature of 190 C. The sources of Al, Si, and P were aluminum isopropoxide, silica gel, and phosphoric acid, respectively. The templates used were the mixture of 75 % morpholine and 25 % tetraethyl ammonium hydroxide. The samples were characterized by XRD, FTIR and SEM techniques. XRD showed that the crystallinity of samples increased with SiO2/Al2O3 ratio. The samples with low silicon content had impurities of SAPO-5 and ALPO-5. SEM images showed the sample synthesized by SiO2/Al2O3 = 0.17, H2O/Al2O3=109.75 ratios had the smallest crystal size. The FTIR results showed that there was no considerable increase in the concentration of strong acidic hydroxyl groups with increasing of SiO2/Al2O3 ratio.

Authors

Kobra Rahimi Ashtari

Department of Chemical Engineering, Tarbiat Modares University, Tehran, Iran

Jafar Towfighi

Department of Chemical Engineering, Tarbiat Modares University, Tehran, Iran

Mehdi Sedighi

Department of Chemical Engineering, Tarbiat Modares University, Tehran, Iran

Ali Mohamadalizade

Gas Research Division, Research Institute of Petroleum Industry, Tehran, Iran

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