Another AVO Cross‐plotting for P‐SV Wave

A CuZnAl-Based Hybrid Material for the Direct Synthesis of Dimethyl Ether from Syngas

“…It was noteworthy that the Al 2 O 3 was more dispersed after run for 150 h reaction for its peaks disappearance, as well as the Cu 0 diffraction peaks at 43.3 °, 50.3 °, 74 ° was observed rather than CuO, suggesting the occurrence of the phase transformation of CuO during the reactions. Although there was no evidence for the presence of Cu + , it could not exclude the possibility that the the acitive sites was not only Cu 0 but also Cu + and the rearrangement between them during the induced period, as in the reports [10,15]. Meanwhile, the absence of peaks corresponding to graphite carbon, which could cause the irreversible deactivation of the material, between 25° and 30° on the spent material revealed that it is hidered by the low reaction temperature, high H 2 concentration and the presence of water in the reaction medium [20].…”

“…The hybrid material can be made by mechanically admixing the two components or by co-precipitation with CuZnAl oxides in a slurry of acidic components, followed by thermal treatment [7][8][9][10], and a complete liquid-phase method is also developed [11,12]. Further modifications on both methanol synthesis material and dehydration material have been conducted by lots of researchers [13][14][15]. However, only a few material systems show high activity and high selectivity, and deactivation occurs to both methanol synthesis material and dehydration material.…”