摘要
杂多酸及其金属盐和有机盐、稀土杂多酸对甲醇转化均具有催化活性。杂多酸金属盐和稀土杂多酸的活性,特别是烃类产物的分布,与相应的杂多酸比较变化不大。产物分布规律只看到脉冲反应条件下,甲醇转化率接近100％范围内的报道,不同反应温度下的报道和随催化剂使用时间而改变的报道。本文选择具有Keggin结构的磷钨酸为催化剂,在连续流动微型反应器中,以纯甲醇蒸气为原料,在较宽的甲醇转化率范围内,考察了甲醇转化反应。并且对其动力学模式进行了探讨。
Product distribution of methanol conversion over 12-tungstophosphoric acid has been examined in a microcatalytic continuous flow reactor at atmospheric pressure with pure methanol vapor feed. According to the characteristics of product distribution, and treating hydrocarbons as a single kinetic species, a triangular scheme among methanol, dimethyl ether, and hydrocarbons was proposed. Based on the normalized [CH2] basis and on the assumption of first order re-action, the rate constant of each reaction(p.72)was obtained from the experiment at 300℃.
