Citation: Qianqian Guo, Fan Yang, Xiaohui Liu, Mengqing Sun, Yong Guo, Yanqin Wang. Low-cost synthesis of nanoaggregate SAPO-34 and its application in the catalytic alcoholysis of furfuryl alcohol[J]. Chinese Journal of Catalysis, ;2020, 41(11): 1772-1781. doi: 10.1016/S1872-2067(20)63604-X shu

Low-cost synthesis of nanoaggregate SAPO-34 and its application in the catalytic alcoholysis of furfuryl alcohol

Qianqian Guo ^a,b, ,
Fan Yang ^c ,
Xiaohui Liu ^a,b ,
Mengqing Sun ^b ,
Yong Guo ^a,b ,
Yanqin Wang ^a,b

a Shanghai Key Laboratory of Functional Materials Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China;
b Research Institute of Industrial Catalysis, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China;
c Engineering Research Center of Large Scale Reactor Engineering and Technology, Ministry of Education, School of Chemical Engineer, East China University of Science and Technology, Shanghai 200237, China

Received Date: 29 February 2020
Revised Date: 30 March 2020

Fund Project: This work was supported by the National Natural Science Foundation of China (21872050, 21832002, 21403065) and the Science and Technology Commission of Shanghai Municipality (18ZR1408500, 10dz2220500).

Silicoaluminophosphate-34 (SAPO-34) molecular sieves have important applications in the petrochemical industry as a result of their shape selectivity and suitable acidity. In this work, nanoaggregate SAPO-34 with a large external surface area was obtained by dissolving pseudoboehmite and tetraethylorthosilicate in an aqueous solution of tetraethylammonium hydroxide and subsequently adding phosphoric acid. After hydrolysis in an alkaline solution, the aluminum and silicon precursors exist as Al(OH)₄^- and SiO₂(OH)^-, respectively; this is beneficial for rapid nucleation and the formation of nanoaggregates in the following crystallization process. Additionally, to study the effect of the external surface area and pore size on the catalytic performance of different SAPO-34 structures, the alcoholysis of furfuryl alcohol to ethyl levulinate (EL) was chosen as a model reaction. In a comparison with the traditional cube-like SAPO-34, nanoaggregate SAPO-34 generated a higher yield of 74.1% of EL, whereas that with cube-like SAPO-34 was only 19.9%. Moreover, the stability was remarkably enhanced for nanoaggregate SAPO-34. The greater external surface area and larger number of external surface acid sites are helpful in improving the catalytic performance and avoiding coke deposition.
- Nanoaggregate SPAO-34,
- External surface area,
- Low cost,
- Catalytic alcoholysis,
- Furfuryl alcohol
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