固定床催化条件下对二甲苯与γ-丁内酯反应的研究

着重研究了固定床催化条件下对二甲苯与γ-丁内酯连续流动反应的催化活性和选择性.在对几类不同固体酸催化剂考评的基础上，选择H-Beta分子筛为催化剂并考察了反应温度、氮气流量、液体进样量、催化剂的焙烧温度等因素对反应的影响以及催化剂的再生稳定性和导致催化剂失活的主要因素.实验结果表明，H-Beta分子筛对此反应有较高的催化活性和选择性，与γ-丁内酯有关的副反应可能是导致催化剂失活的主要因素，但是失活后的催化剂可直接在固定床中通入空气灼烧反复活化再生，避免了以往液体酸催化中催化剂的一次性使用问题，为该反应今后的工业化应用提供了有用的信息.

Studies on the catalytic reaction of p-xylene and γ-butyrolactone under fixed-bed catalytic condition

The continuous flow reaction of p-xylene and γ-butyrolactone over catalytic fixed-bed reactor was studied. On the basis of evaluation to several different types of solid acid catalysts, H-Beta was selected to do further re search. The effects of reaction temperature, flow rate of nitrogen, input flow rate of liquid, calcination temperature for the catalyst pretreatment were investigated, the activity recoverability and the main factors inducing the deactiva- tion of catalyst were checked. The experimental results indicated that, H-Beta exhibited higher catalytic activity and selectivity for the reaction. The side reaction concerning with γ-butyrolactone may be the main factor making the cat- alyst deactivated. But the deactivated catalyst can be regenerated repeatedly in the fixed-bed by calcination under the air flow, which would avoid the disposable problem for the traditional liquid acid catalysts and provide some useful information for the future industrial application.