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| Modification of NaY zeolite by oxalic acid and its characteristics |
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| DOI： |
| KeyWord:：NaY zeolite oxalic acid modification waste cooking oil catalytic cracking |
| FundProject:国家自然科学基金（51466004） |
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| Abstract: |
| NaY zeolite was modified by oxalic acid, and the modification conditions were optimized by single factor experiment. The components of liquid products obtained from cracking of waste cooking oil catalyzed by the modified NaY zeolite under the optimal modification conditions were analyzed by GC-MS, and NaY zeolite before and after modification was characterized by XRD, FT-IR and NH3-TPD. The results showed that the optimal modification conditions were obtained as follows: oxalic acid concentration 0.08 mol/L, reaction temperature 20 ℃ and reaction time 30 min. The oxalic acid modified NaY zeolite was used in the catalytic cracking of waste cooking oil, and the conversion rate of waste cooking oil was 49.97%, gas productivity 3 252 mL, acid value and saponification value of the liquid products were 0.42 mgKOH/g and 11.69 mgKOH/g, respectively. The main components of liquid products were aromatic hydrocarbons(43.57%), olefins(28.24%) and alkanes(12.69%). After modification, the zeolite sieve structure remained intact, the relative crystallinity increased, the ratio of silicon to aluminum increased, and there were weak acid center and strong acid center. |
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