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论文类型：期刊论文

发表时间：2019-05-01

发表刊物：JOURNAL OF ENERGY CHEMISTRY

收录刊物：SCIE、EI

卷号：32

页面范围：174-181

ISSN号：2095-4956

关键字：SAPO-34; Metal modification; MTO; Product selectivity; Ethylene

摘要：The SAPO-34 catalyst was fine-tuned with zinc cations through a straightforward template-assisted ion incorporation (TII) process, without the necessary template pre-removal and the preparation of NH4-SAPO-34 intermediate, which is more facile, efficient and cost-effective than the conventional ion exchange process. The template-assisted zinc cations incorporated SAPO-34 catalysts were characterized by XRD, XRF, N-2 adsorption-desorption, XPS, SEM, EDX, H-1 NMR, respectively. Enhanced selectivity to ethylene and ratio of ethylene to propylene in MTO reaction are observed over the zinc cations modified SAPO-34 catalysts, due to the facilitated formation of lower methylbenzenes that favour the ethylene generation, as well as the increased diffusion hindrance originated from the zinc cations incorporation and the facilitated generation of aromatics compound. (c) 2018 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.