کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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59461 | 1419447 | 2014 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Surface reactions of CuCl2 and HY zeolite during the preparation of CuY catalyst for the oxidative carbonylation of methanol Surface reactions of CuCl2 and HY zeolite during the preparation of CuY catalyst for the oxidative carbonylation of methanol](/preview/png/59461.png)
A CuI/Y catalyst was prepared for the vapor phase oxidative carbonylation of methanol to dimethyl carbonate (DMC). The surface solid-state interactions of CuCl2 with HY zeolite were studied using thermogravimetry. The surface properties and morphologies of catalyst samples were analyzed by thermogravimetry, X-ray photoelectron spectroscopy, and elemental analysis, and their catalytic performance was assessed in a fixed-bed reactor. Both CuCl and CuCl2 were found to co-exist on the external surface of the catalyst, while ion-exchanged CuI along with small amounts of adsorbed CuCl were contained in the internal Y zeolite cage structures. Both the CuCl and CuCl2 were active species during the DMC synthesis. Compared with a conventional CuI/Y catalyst prepared by heating a mixture of CuCl and HY zeolite, the CuI/Y catalyst prepared by heating a mixture of CuCl2 and HY zeolite showed increased catalytic activity for the oxidative carbonylation of methanol, even though it had lower Cu and Cl contents.
Graphical AbstractA Cu/Y(CuCl2) catalyst was prepared by heating a combination of CuCl2 and HY zeolite, and exhibited higher catalytic activity for the oxidative carbonylation of methanol compared with a conventional Cu/Y catalyst generated by heating a mixture of CuCl and HY zeolite, even though it had lower Cu and Cl contents. In this catalyst, both CuCl and CuCl2 were present on the surface and ion-exchanged CuI and low levels of adsorbed CuCl were in the internal Y zeolite cage structure.Figure optionsDownload as PowerPoint slide
Journal: Chinese Journal of Catalysis - Volume 35, Issue 1, January 2014, Pages 134–139