Chinese Journal of Catalysis ›› 2021, Vol. 42 ›› Issue (6): 994-1003.DOI: 10.1016/S1872-2067(20)63720-2

• Article • Previous Articles     Next Articles

Straightforward synthesis of beta zeolite encapsulated Pt nanoparticles for the transformation of 5-hydroxymethyl furfural into 2,5-furandicarboxylic acid

Xiaoling Liu, Lei Chen, Hongzhong Xu, Shi Jiang, Yu Zhou*(), Jun Wang#()   

  1. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 210009, Jiangsu, China
  • Received:2020-07-18 Accepted:2020-08-31 Online:2021-06-18 Published:2021-01-30
  • Contact: Yu Zhou,Jun Wang
  • About author:#E-mail: junwang@njtech.edu.cn
    *Tel/Fax: +86-25-58139803; E-mail: njutzhouyu@njtech.edu.cn;
  • Supported by:
    National Natural Science Foundation of China(22072065);National Natural Science Foundation of China(U1662107);National Natural Science Foundation of China(21476109);National Natural Science Foundation of China(21303084);Six talent peaks project in Jiangsu Province(JNHB-035);Jiangsu Provincial Science Foundation for Youths(SBK2020044703);Project of Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)

Abstract:

Encapsulating noble metal nanoparticles (NPs) within the zeolite framework enhances the stability and accessibility of active sites; however, direct synthesis remains a challenge because of the easy precipitation of noble metal species under strong alkali crystallization conditions. Herein, beta zeolite-encapsulated Pt NPs (Pt@Beta) were synthesized via a hydrothermal approach involving an unusual acid hydrolysis preaging step. The ligand—(3-mercaptopropyl)trimethoxysilane—and Pt precursor were cohydrolyzed and cocondensed with a silica source in an initially weak acidic environment to prevent colloidal precipitation by enhancing the interaction between the Pt and silica species. Thus, the resultant 0.2%Pt@Beta was highly active in the transformation of 5-hydroxymethylfurfural into 2,5-furandicarboxylic acid (FDCA) under atmospheric O2 conditions by using water as the solvent while stably evincing a high yield (90%) associated with a large turnover number of 176. The excellent catalysis behavior is attributable to the enhanced stability that inhibits Pt leaching and strengthens the intermediates that accelerate the rate-determining step for the oxidation of 5-formyl-2-furan carboxylic acid into FDCA.

Key words: Hydrothermal synthesis, Zeolite, Noble metal nanoparticles, Heterogeneous catalysis, Biomass conversion