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| KOAc/NaY催化DMC合成邻甲基苯甲醚稳定性考察 | |
| 引用本文： | 董燕敏,薛冰,陈兴权,赵天生.KOAc/NaY催化DMC合成邻甲基苯甲醚稳定性考察[J].天然气化工,2009,34(5). |
| 作者姓名： | 董燕敏 薛冰 陈兴权 赵天生 |
| 作者单位： | 1. 江苏工业学院,江苏省精细石油化工重点实验室,江苏,常州,213016 2. 江苏工业学院,江苏省精细石油化工重点实验室,江苏,常州,213016;宁夏大学能源化工自治区重点实验室,宁夏,银川,750021 3. 宁夏大学能源化工自治区重点实验室,宁夏,银川,750021 |
| 基金项目： | 教育部重点研究项目，科技部重大基础研究前期研究专项，江苏省教育厅高校自然科学基础研究项目 |
| 摘 要： | 通过连续流动固定床反应器考察了真空浸渍制备的负载型固体碱催化剂KOAc/NaY(2mmol/g)的稳定性。结果表明,该催化剂在30h内具有较好的稳定性,但随后活性逐渐下降;热重分析表明催化剂在450K～600K的温度范围内有较好的热稳定性;X射线衍射(XRD)、CO2程序升温脱附(CO2-TPD)、BET和扫描电镜(SEM)等表征结果表明,碳酸二甲酯(DMC)在高温下的分解造成的积炭堵塞催化剂的孔道导致催化剂表面碱中心大量减少是其活性降低的原因。 |
| 关 键 词： | 碳酸二甲酯 甲基化 邻甲基苯甲醚 乙酸钾/NaY沸石催化剂 失活 |
Investigation on stability of KOAc/NaY catalyst for synthesis of o-methoxytoluene with dimethyl carbonate as methylating agent |
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| Abstract: | The stability of KOAc/NaY(2 mmol/g) catalyst during the synthesis of o-methoxytoluene via vapor phase reaction of ocresol with dimethyl carbonate(DMC) was investigated in a continuous flow fixed bed reactor.The results showed that the activity of the catalyst was stable for 30 hours,and then decreased.The results of TG-DSC indicated the catalyst had good thermal stability within the temperature range of 450K to 600K,and the results of XRD,CO2-TPD,BET and SEM indicated that the surfaces of the used catalysts were covered with deposited carbon from the decomposition of DMC in high temperature and the pores of the catalyst were blocked,which caused the loss of basic sites and led to deactivation of the catalyst. |
| Keywords: | dimethyl carbonate DMC methylation o-methoxytoluene KOAc/NaY catalyst deactivation |
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