摘要
SAPO-34分子筛具有中等强度的酸中心和适宜的孔径结构,催化甲醇或二甲醚反应时有利于生成乙烯、丙烯。SAPO-34分子筛的催化活性、选择性、寿命、水热稳定性及热稳定性在很大程度上取决于其孔结构、表面酸性、晶粒尺寸和晶体化学组成等物化性质,掌握物化性质对催化性能的影响规律对催化剂设计至关重要。通过分析甲醇制烯烃反应中SAPO-34分子筛物化性质对活性、选择性和寿命的影响,综述了有效控制SAPO-34分子筛酸性、晶粒大小、孔结构及表面化学组成的各种方法。
SAPO-34 molecular sieve with moderate acidity and characteristic small pore structure exhibits super selectivity to C2--C3 olefins during the conversion of methanol to light olefins （MTO）. However, the catalytic performance of SAPO-34 molecular sieve catalyst mainly depends on its physicochemical characteristics, such as pore structure, surface acidity, crystal size and chemical compositions. Thus, a fully understanding of the relationship between physicochemical property and catalytic performance of the catalyst is helpful for an optimum catalyst design. In this paper the effects of physicochemical properties of SAPO-34 on the catalytic performance including activity, selectivity, thermal and hydrothermal stability of the catalyst in MTO process are analyzed, as well as various methods for adjusting the acidity, crystal size, pore structure and chemical compositions of SAPO-34 are summarized.
出处
《石油炼制与化工》
CAS
CSCD
北大核心
2010年第11期8-14,共7页
Petroleum Processing and Petrochemicals
