PhD Candidate Jianwen Li

Committee: International Scientific Committee of Chemical and Molecular Engineering
University: East China University Of Science And Technology
Department:
Research Fields: butene, catalytic cracking, HZSM-5, modification,

Publications

3 Catalytic Study of Methanol-to-Propylene Conversion over Nano-Sized HZSM-5

Authors: Hongfang Ma, Weiyong Ying, Jianwen Li, Haitao Zhang, Weixin Qian

Abstract:

Methanol-to-propylene conversion was carried out in a continuous-flow fixed-bed reactor over nano-sized HZSM-5 zeolites. The HZSM-5 catalysts were synthesized with different Si/Al ratio and silicon sources, and treated with NaOH. The structural property, morphology, and acidity of catalysts were measured by XRD, N2 adsorption, FE-SEM, TEM, and NH3-TPD. The results indicate that the increment of Si/Al ratio decreased the acidity of catalysts and then improved propylene selectivity, while silicon sources had slight impact on the acidity but affected the product distribution. The desilication after alkali treatment could increase intracrystalline mesopores and enhance propylene selectivity.

Keywords: alkali treatment, HZSM-5, methanol-to-propylene, synthesis condition

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2 Butene Catalytic Cracking to Propylene over Iron and Phosphorus Modified HZSM-5

Authors: Hongfang Ma, Weiyong Ying, Jianwen Li, Haitao Zhang, Qiwen Sun

Abstract:

HZSM-5 zeolites modified by iron and phosphorus were applied in catalytic cracking of butene. N2 adsorption and NH3-TPD were employed to measure the structure and acidity of catalysts. The results indicate that increasing phosphorus loading decreased surface area, pore volume and strong acidity of catalysts. The addition of phosphorus significantly decreased butene conversion and promoted propylene selectivity. The catalytic performance of catalyst was strongly dependent on the reaction conditions. Appropriate reaction conditions could suppress side reactions and enhance propylene selectivity.

Keywords: Modification, HZSM-5, butene catalytic cracking, reaction conditions

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1 Catalytic Cracking of Butene to Propylene over Modified HZSM-5 Zeolites

Authors: Hongfang Ma, Weiyong Ying, Jianwen Li, Haitao Zhang, Qiwen Sun

Abstract:

Catalytic cracking of butene to propylene was carried out in a continuous-flow fixed-bed reactor over HZSM-5 catalysts modified by nickel and phosphorus. The structure and acidity of catalysts were measured by N2 adsorption, NH3-TPD and XPS. The results revealed that surface area and strong acid sites both decreased with increasing phosphorus loadings. The increment of phosphorus loadings reduced the butene conversion but enhanced the propylene selectivity and catalyst stability.

Keywords: Modification, Catalytic cracking, butene, HZSM-5

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Abstracts

3 Catalytic Study of Methanol-to-Propylene Conversion over Nano-Sized HZSM-5

Authors: Hongfang Ma, Weiyong Ying, Jianwen Li, Haitao Zhang, Weixin Qian

Abstract:

Methanol-to-propylene conversion was carried out in a continuous-flow fixed-bed reactor over nano-sized HZSM-5 zeolites. The HZSM-5 catalysts were synthesized with different Si/Al ratio and silicon sources, and treated with NaOH. The structural property, morphology, and acidity of catalysts were measured by XRD, N2 adsorption, FE-SEM, TEM, and NH3-TPD. The results indicate that the increment of Si/Al ratio decreased the acidity of catalysts and then improved propylene selectivity, while silicon sources had slight impact on the acidity but affected the product distribution. The desilication after alkali treatment could increase intracrystalline mesopores and enhance propylene selectivity.

Keywords: alkali treatment, HZSM-5, methanol-to-propylene, synthesis condition

Procedia PDF Downloads 52
2 Butene Catalytic Cracking to Propylene over Iron and Phosphorus Modified HZSM-5

Authors: Hongfang Ma, Weiyong Ying, Jianwen Li, Haitao Zhang, Qiwen Sun

Abstract:

HZSM-5 zeolites modified by iron and phosphorus were applied in catalytic cracking of butene. N2 adsorption and NH3-TPD were employed to measure the structure and acidity of catalysts. The results indicate that increasing phosphorus loading decreased surface area, pore volume and strong acidity of catalysts. The introduction of phosphorus significantly decreased butene conversion and promoted propylene selectivity. The catalytic performance of catalyst was strongly dependent on the reaction conditions. Appropriate reaction conditions could suppress side reactions and enhance propylene selectivity.

Keywords: Modification, HZSM-5, butene catalytic cracking, reaction conditions

Procedia PDF Downloads 291
1 Catalytic Cracking of Butene to Propylene over Modified HZSM-5 Zeolites

Authors: Hongfang Ma, Weiyong Ying, Jianwen Li, Haitao Zhang, Qiwen Sun

Abstract:

Catalytic cracking of butene to propylene was carried out in a continuous-flow fixed-bed reactor over HZSM-5 catalysts modified by nickel and phosphorus. The structure and acidity of catalysts were measured by N2 adsorption, NH3-TPD and XPS. The results revealed that surface area and strong acid sites both decreased with increasing phosphorus loadings. The increment of phosphorus loadings reduced the butene conversion but enhanced the propylene selectivity and catalyst stability.

Keywords: Modification, Catalytic cracking, butene, HZSM-5

Procedia PDF Downloads 234