期刊
RSC ADVANCES
卷 11, 期 23, 页码 13876-13884出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ra02087k
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资金
- National High Technology Reserch and Development Plan of China (863 plan) [2011AA05A204]
SAPO-18 showed stable catalytic performance with high selectivity to light olefins, while SAPO-35 quickly deactivated due to the formation of heavy coke deposits, leading to unsustainable catalytic performance.
SAPO-18 and SAPO-35 were synthesized and utilized as the zeotype in the bifunctional catalyst for the STO process, respectively. SEM and Ar physisorption proved that SAPO-18 displayed abundant outer cages, and facilitated the diffusion of the reactant and products. NH3-TPD revealed the adequate acid strength of SAPO-18, thus ZnCrOx + SAPO-18 bifunctional catalyst showed high selectivity to light olefins during the whole stage of the STO process. 19.9% CO conversion and 68.6% light olefins selectivity (free of CO2) was achieved over ZnCrOx + SAPO-18(0.048) at 653 K, 1.0 MPa, GHSV = 6000 mL g(-1) h(-1). The catalytic performance was stable after 6000 minutes of reaction because of the good diffusibility of SAPO-18. GC-MS and TG demonstrated that the ZnCrOx + SAPO-35 bifunctional catalyst deactivated very quickly because of the severe formation of the heavy coke deposits, which should be attributed to the acidic properties of SAPO-35 and the poor diffusibility originating from its 2-dimensional channel system. Although the ZnCrOx + SAPO-35 bifunctional catalyst exhibited high CO conversion and light olefins selectivity at the early stage of the STO process as well, its catalytic performance was unsustainable.
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