Abstract Carbonylation of dimethyl ether (DME) to methyl alcohol (MA) is an important step to produce ethanol from syngas. Mordenite (MOR) is the most promising industrial catalyst for DME carbonylation process. In microporous zeolites, diffusion property usually affects catalytic performance. In this study, we treated MOR by using acetic acid solution with different concentrations and tetraethyl orthosilicate (TEOS), respectively. The catalysts were characterized by X-ray fluorescence (XRF), X-ray diffraction (XRD), nuclear magnetic resonance (7Al MAS NMR), N2 physical adsorption, N2 physical adsorption, NH3 temperature-programmed desorption (NH3-TPD) and pyridine Fourier infrared spectroscopy (Py-IR). The results indicated that the post-treatment by acetic acid solution or tetraethyl orthosilicate had limited effects on the physical structure and chemical properties of the MOR samples. With increasing acetic acid concentration, the initial conversion of DME (XDME) first increased and then decreased, and the apparent initial MA formation rate (TOFMA) increased monotonically. While both the XDME and the TOFMA decreased after TEOS deposition. The diffusion property of DME in different samples were quantitatively analyzed by Zero Length Column (ZLC) method. The results showed that the diffusion activation energy reduced after acetic acid treatment and increased after TEOS treatment, suggesting that the changes in apparent TOFMA was due to difference in diffusion property.
WANG Jianhao,XIA Yumeng,LI Ying et al. Effect of Post Treatment on the Structural and Diffusion Properties of Mordenite Catalyst in Dimethyl Ether Carbonylation[J]. Chemical Reaction Engineering and Technology, 2021, 37(6): 520-527.
WANG Jianhao,XIA Yumeng,LI Ying et al. Effect of Post Treatment on the Structural and Diffusion Properties of Mordenite Catalyst in Dimethyl Ether Carbonylation[J]. Chemical Reaction Engineering and Technology, 2021, 37(6): 520-527.
