Hydrothermal synthesis of nanocrystalline H[Fe, Al]ZSM-5 zeolites for conversion of methanol to gasoline. (15th March 2015)

• Record Type: Journal Article
• Authors: Li, Jianqing; Miao, Pengjie; Li, Zhuo; He, Tao; Han, Dezhi; Wu, Jingli; Wang, Zhiqi; Wu, Jinhu
• Is Part Of: Energy conversion and management. Volume 93(2015)
• Page Start: 259
• Page End: 266
• Publication Date: 2015-03-15
• Subjects: Hydrothermal synthesis -- Nanocrystalline -- H[Fe, Al]ZSM-5 -- Methanol to gasoline (MTG); Direct energy conversion -- Periodicals; Energy storage -- Periodicals; Energy transfer -- Periodicals; Énergie -- Conversion directe -- Périodiques; Direct energy conversion; Periodicals; 621.3105
• DOI: 10.1016/j.enconman.2015.01.031
• Languages: English
• ISSNs: 0196-8904

Abstract

Graphical abstract: Nanocrystalline H[Fe, Al]ZSM-5 zeolites with different Fe content were synthesized by hydrothermal method. Methanol to gasoline (MTG) reaction was chosen to test the catalytic performance of as-prepared nanocrystalline H[Fe, Al]ZSM-5 zeolites, indicating that the nanocrystalline H[Fe, Al]ZSM-5 catalysts exhibited the outstanding catalytic performance in MTG process. Highlights: Nanocrystalline H[Fe, Al]ZSM-5 zeolites were synthesized by in situ hydrothermal method. Fe species could be introduced into ZSM-5 framework and new active sites are created. The H[Fe, Al]ZSM-5 catalysts exhibit improved catalytic performance in MTG process. Abstract: Nanocrystalline H[Fe, Al]ZSM-5 zeolites with different Fe content were synthesized by hydrothermal method with tetrapropylammonium hydroxide (TPAOH) as structure-directing agent (SDA), in which tetraethyl orthosilicate (TEOS) and sodium aluminate (NaAlO2 ) were used as Si and Al sources, respectively. The prepared samples were characterized by means of techniques such as XRD, SEM, N2 adsorption–desorption, ICP-AES, UV–Vis, NH3 -TPD, pyridine-FTIR and FT-IR. The results indicated that Fe species could be incorporated into ZSM-5 zeolite framework in the forms of isolated Fe 3+ and small oligomeric Fe x O y clusters, resulting in the formation of some new active sites and the lower Brønsted acid sites content. The catalytic performances of prepared nanocrystalline H[Fe, Al]ZSM-5 zeolites were evaluated by methanol to gasoline (MTG) reaction in a fixed bed stainless-steel reactor. The catalytic results illustrated that the incorporation of Fe enhanced the activity and stability of nanocrystalline H[Fe, Al]ZSM-5 catalysts in MTG reaction and reduced the yield of aromatics in gasoline. The methanol conversion was higher than 99% for about 110 h by optimizing the Fe content, meanwhile, the gasoline yield reached up to 32.7%, the aromatics and durene selectivity were controlled to a low level of 38.7% and 0.47%, respectively.