合成气
无定形固体
氧气
催化作用
沸石
化学工程
材料科学
化学
工作(物理)
甲烷
无机化学
活性氧
分子筛
燃料电池
作者
Daoming Jin,Xin Meng,Dandan Yang,Fan Xu,Bowen Xu,Rui Zhao,Wenhua Dai,Zhong Xin
标识
DOI:10.1021/acs.iecr.4c01753
摘要
The remarkable selectivity of light olefins makes bifunctional catalysis a highly promising technique for directly producing light olefins from syngas. Amorphous ZnCr oxides were synthesized by low-temperature calcination in a H2 atmosphere and combined with SAPO-34 zeolites to convert syngas to light olefins. The characterizations revealed that the amorphous ZnCr oxides exhibited a noteworthy capability to adsorb and activate more CO molecules due to a larger specific surface area and more oxygen vacancies compared to the crystalline ZnCr oxides. More active intermediate species would exist on the surface of the amorphous ZnCr oxides and within the pores of the SAPO-34 zeolite. Simultaneously, amorphous ZnCr oxides exhibited greater stability compared to crystalline ZnCr oxides because structural reconstruction would occur on crystalline ZnCr oxides, leading to the appearance and agglomeration of ZnO particles during harsh reaction conditions. Consequently, the bifunctional catalyst composed of amorphous ZnCr oxides and SAPO-34 zeolites demonstrated superior catalytic activity and stability in syngas conversion. After reaction for 50 h, the bifunctional catalyst maintained a CO conversion of 49.8% and a C2=–C4= selectivity of 80.2%, achieving a space–time yield of 16.2 mmol·g–1·h–1. The findings suggest that controlling the structure of metal oxide is an efficient method for developing catalysts with high catalytic activity and stability in syngas conversion.
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