Abstract

The heterogeneous catalytic conversion of dimethyl ether (DME) to 1,3-butadiene and butylenes in the presence of a ZnO/γ-Al₂O₃ catalyst in a wide range of temperatures, feed space velocities, and reactant concentrations has been studied. It has been found that temperature regions of 380–420 and 440–480°C, which are conventionally designated as low-temperature and high-temperature regions, differ in the laws governing the occurrence of the process associated with the specificity of coking of the catalyst surface and a redistribution of the surface concentration of Brønsted and Lewis acid sites. A hypothesis of a change of the catalytic process mechanism upon the transition of the reaction into the high-temperature region has been put forward and confirmed by the occurrence of a hysteresis detected in this temperature range. The effect of hydrogen peroxide on the hysteresis parameters and the steady state stability during DME conversion has been shown.

中文翻译：

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ZnO /γ-Al2 O 3复合物催化二甲醚转化过程中稳态多重性的检测：焦炭和过氧化氢的影响

摘要

二甲醚（DME）的多相催化转化为1,3-丁二烯和丁烯中的一个的ZnO /γ-Al系存在₂ ö ₃已经研究了在宽温度，进料空间速度和反应物浓度范围内的催化剂。已经发现，通常被称为低温和高温区域的380–420和440–480°C的温度区域在支配与焦化焦油特异性相关的过程发生规律方面存在差异。催化剂表面以及布朗斯台德和路易斯酸中心的表面浓度的重新分布。提出了关于在反应过渡到高温区域中催化过程机理改变的假设，并通过在该温度范围内检测到的磁滞现象来证实。已显示过氧化氢对DME转换过程中的磁滞参数和稳态稳定性的影响。