Synthesis of Hierarchically Porous Zeolite Ti-MWW with Different Hard Templates and Their Application in Allyl Alcohol Conversion
- 54 Downloads
Diffusion limitation caused by microporous molecular sieves has always been a bottleneck problem in liquid phase epoxidation. In this study, several different carbon sources were used as hard templates to prepare hierarchically porous zeolite Ti-MWW (cTi-MWW) successfully. Compared with conventional Ti-MWW, cTi-MWW has an additional hierarchically porous structure and abundant pore structure distribution. Especially, the cTi-MWW prepared with polyethylene glycol1540 (PEG) as the hard template not only has a multiple hierarchically porous structure, but also exhibits small crystal size and good hydrophobicity properties studied by TEM and in situ FT-IR. At the same time, the cTi-MWW prepared with PEG exhibits better activity than the conventional Ti-MWW in the selective epoxidation reaction of allyl alcohol (AAL) with H2O2 as oxidant and the conversion is improved by 11% (Si/Ti = 20). And a higher efficiency and longer catalyst life in fixed-bed catalytic reactor were exhibited by using cTi-MWWPEG as catalyst. The physicochemical properties of cTi-MWW prepared with different hard templates were systematically studied by SEM, XPS, UV–Vis, XRD and N2 absorption–desorption techniques. This method is effective for the synthesis of cTi-MWW and significant for the preparation of hierarchically porous zeolites in industrial production.
KeywordsHard template Hierarchically porous Ti-MWW Glycidol Diffusion
Sincerely acknowledges the support of the National Natural Science Foundation of China (No. 21571036). Sincerely thank Zhang Xinqi for helping to analyze the TEM results from the test center.
Compliance with Ethical Standards
Conflict of interest
The authors declare that they have no conflict of interest.
- 8.Wei X, Zheng Y, Song Z et al (2010) Selective oxidation of pyridine to pyridine-N-oxide with hydrogen peroxide over Ti-MWW catalyst. Catal Today 157(1):114–118Google Scholar
- 16.Wu P, Liu Y, He M et al (2004) A novel titanosilicate with MWW structure: catalytic properties in selective epoxidation of diallyl ether with hydrogen peroxide. J Catal 228(1):183–191Google Scholar
- 17.Fajdek A, Wroblewska A, Milchert E et al (2012) Epoxidation of methallyl alcohol to 2-methylglycidol over Ti-MWW catalyst under atmospheric pressure. Oxid Commun 35(2):177–292Google Scholar
- 18.Fajdek A, Wroblewska A, Milchert E et al (2014) Optimisation of the process parameters of epoxidation of crotyl alcohol with hydrogen peroxide on Ti-MWW catalyst. Oxid Commun 37(2):445–460Google Scholar
- 26.Taramasso M, Perego G, Notari B, Inventors (1983) Preparation of porous crystalline synthetic material comprised of silicon and titanium oxides. US patent 4410501Google Scholar
- 28.Tao Yousheng, Kanoh Hirofumi, Lloyd Abrams A et al (2010) Mesopore-modified zeolites: preparation, characterization, and applications. Chem Rev 37(21):896–910Google Scholar
- 37.Aleksandra K, Justyna G, Roth WJ et al (2018) Incorporation of Ti as a pyramidal framework site in the mono-layered MCM-56 zeolite and its oxidation activity. ChemCatChem 11(1):520–527Google Scholar
- 43.Fan SH, Cheng MJ (2016) Synthesis of hierarchical MCM-22 using graphene oxide as solid template. J Synth Cryst 45(2):546–550Google Scholar