Enhanced MTO performance over acid treated hierarchical SAPO-34

详细信息    查看全文

• 作者：Shu Ren^a ; ^b ; Guojuan Liu^b ; Xian Wu^a ; ^c ; Xinqing Chen^b ; Minghong Wu^c ; Gaofeng Zeng^b ; Ziyu Liu^b ; ^{liuziyu@sari.ac.cn} ; Yuhan Sun^b ; ^{sunyh@sari.ac.cn}
• 关键词：Acid treatment ; Hierarchical pore ; SAPO-34 ; Methanol to olefins ; Single-run lifetime
• 刊名：Chinese Journal of Catalysis
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：38
• 期：1
• 页码：123-130
• 全文大小：845 K
• 卷排序：38

文摘

Hierarchical SAPO-34 crystals were synthesized by a facile acid etching post-treatment. Butterfly-shaped porous patterns on four side faces and hierarchical pores composed of micropores, mesopores and macropores were formed after a nitric acid or oxalic acid treatment. The catalytic performance of the hierarchical SAPO-34 for the methanol to olefins (MTO) process showed that the synergistic effect of the hierarchical pores and acid sites resulted in a longer catalyst lifetime (from 210 to 390 min for the acid treated SAPO-34) and higher selectivity to light olefins of 92%–94%. The ethylene selectivity can be adjusted between 37.4% and 51.5% by the pore size. No hierarchical SAPO-34 was obtained after a treatment with butanedioic acid, and with this sample, fast deactivation was detected after 100 min.