论文部分内容阅读
本文采用ＴＰＳＲ－ＭＳ技术考察ＣＨ＿３ＯＨ在Ｍｇｏ催化剂上的分解反应，并与ＭｇＯ固体碱催化剂表面的酸碱性质进行关联。发现ＣＨ＿３ＯＨ在２３８℃、３４２℃和５３３℃处有三个脱附峰，对应地有三种表面吸附形式。这三种吸附形式与催化剂表面的酸、碱中心的强度有关，弱的酸碱中心上，ＣＨ＿３ＯＨ以分子和弱吸附的表面甲氧基形式吸附，２３８℃时的脱附峰主要为甲醇和二甲醚；较强的酸碱中心上表面甲氧基吸附较牢固，于３４２℃脱附，产生的二甲醚的相对量亦多；强酸强碱中心上吸附的甲醇易脱氢而形成表面吸附的（Ｈ＿２ＣＯ），高温５３３℃脱附时分解成ＣＯ和Ｈ＿２。
In this paper, the decomposition reaction of CH_3OH on Mgo catalyst was investigated by TPSR-MS and related to the acid-base properties of MgO solid base catalyst. CH_3OH was found to have three desorption peaks at 238 ° C, 342 ° C and 533 ° C, corresponding to three surface adsorption forms. These three adsorption forms are related to the strength of the acid and alkali centers on the surface of the catalyst. On the weak acid-base centers, CH_3OH is adsorbed on the surface and weakly adsorbed surface methoxy groups. The desorption peaks at 238 ° C are mainly methanol and bis Methyl ether; strong acid-base center of the surface of the methoxy adsorption more firmly at 342 ℃ desorption, the relative amount of dimethyl ether produced more; strong acid and alkali on the adsorption of methanol easily dehydrogenation and the formation of surface adsorption (H 2 CO), decomposing into CO and H 2 when desorbing at high temperature of 533 ℃.