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| NaY分子筛的草酸改性及表征 |
| Modification of NaY zeolite by oxalic acid and its characteristics |
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| DOI： |
| 中文关键词: NaY分子筛 草酸 改性 餐厨废油 催化裂化 |
| 英文关键词:：NaY zeolite oxalic acid modification waste cooking oil catalytic cracking |
| 基金项目:国家自然科学基金（51466004） |
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| 中文摘要: |
| 采用草酸对NaY分子筛进行改性，通过单因素试验优化改性条件，采用GC-MS分析了最佳改性条件下制备的改性分子筛催化裂化餐厨废油所得液体产物的组成，并使用XRD、FT-IR、NH3-TPD 等对改性前后NaY分子筛进行表征。结果表明：最佳改性条件为草酸浓度0.08 mol/L、反应温度20 ℃、反应时间30 min；以最佳的条件下制备的草酸改性NaY分子筛进行催化裂化餐厨废油反应，餐厨废油的转化率为49.97%，产气量为3 252 mL，液体产物的酸值（KOH）为0.42 mg/g，皂化值（KOH）为11.69 mg/g；液体产物的主要成分为芳香烃（43.57%）、烯烃（28.24%）和烷烃(1269%)等；改性后的分子筛结构保持完整，相对结晶度提高，骨架硅铝比增大，同时存在弱酸中心和强酸中心。 |
| 英文摘要: |
| 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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