甲醇脱氢制甲醛反应碳酸钠催化性能的研究

Study on the Performance of Sodium Carbonate Catalyst for Methanol Dehydrogenation to Formaldehyde

在一个内径为16mm的固定床陶瓷管反应器中,研究了用不同方法制备的碳酸钠催化剂催化甲醇脱氢制无水甲醛反应的工艺条件。结果表明,在523K煅烧NaHCO390min得到的Na2CO3催化剂具有最佳的催化活性。在最佳的反应条件:温度953K、常压、空速1.4ml/(g.s)、甲醇/N2进料气中φ(CH3OH)=10%条件下,甲醛最高产率达44%,相应的甲醇转化率和甲醛选择性分别为66%和67%。在55h的稳定性试验中,该催化剂有4 h的高活性期,稳定后活性基本保持不变。

The reaction conditions of methanol dehydrogenation to water-free formaldehyde was studied in a 16mm diameter fixed bed ceramic tube reactor, using Na2CO3 as catalyst, which was prepared by different ways. It was found that Na2CO3 obtained from calcining NaHCO3 at 523K for 90 mins has the highest catalytic activity. Under the optimum reaction conditions： 953K, ambient pressure, feed space velocity 1.4 ml/（s, g） and methanol volume fraction in MeOH/N2 feed 10 %, the highest formaldehyde yield of 44% was obtained with a methanol conversion of 66 % and a formaldehyde selectivity of 67 %. After four hours initial high active period, the activity of Na2CO3 catalyst kept nearly constant in the 55 hours stability test period.