Chunyi Li

China University of Petroleum, East China

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Guowei Wang

China University of Petroleum, East China

Honghong Shan

China University of Petroleum, East China

Xiaolin Zhu

China University of Petroleum, East China

Xiuyi Li

East China University of Science and Technology

Chaohe Yang

China University of Petroleum, East China

Huiwen Huang

Shandong University of Science and Technology

Chaohe Yang

China University of Petroleum, East China

Qiukai Cui

Beijing Institute of Petrochemical Technology

Huanling Zhang

Sinopec (China)

Qiang Zhang

Chongqing University of Technology

Cooperative Institutions

China University of Petroleum, East China

Chinese Academy of Sciences

China University of Petroleum, Beijing

Shanghai Jiao Tong University

University of Science and Technology of China

University of Chinese Academy of Sciences

Peking University

Sichuan University

Huazhong University of Science and Technology

Tsinghua University

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Catalytic Cracking Behavior of n-Heptane over HZSM-5 Catalyst

Acta Physico-Chimica Sinica (2010)

Xiao Hu Chunyi Li Chaohe Yang

Abstract：The catalytic cracking of n-heptane, which was selected as a model compound for the paraffin of light straight-run naphtha, was studied over HZSM-5 catalyst in a fixed-bed microreactor.Its catalytic behavior was compared with that of 1-heptene and the effects of hydrothermal treatment and catalyst carrier were evaluated.The results showed that compared with the cracking of 1-heptene, the concentration of hydrogen, methane, and ethane was much higher in the cracked gas obtained from the cracking of n-heptane.We concluded that this mainly originated from the monomolecular cracking pathway while the content of propylene and butylene in liquefied petroleum gas (LPG) was much lower.Upon hydrothermal treatment, the total amount of acid decreased sharply, especially the strong Bro ̈nsted acid (B acid) sites, leading to a steep decline in catalytic activity.This was accompanied by the improved propylene/ propane and butylene/butane molar ratios in the products.Meanwhile, the ratio between the C3 and C4 products decreased, suggesting a decrease in the occurrence of monomolecular cracking.The carrier also significantly influenced the cracking behavior of n-heptane.We found that the presence of Lewis acid (L acid) sites in the carrier improved the n-heptane conversion and promoted the bimolecular cracking pathway.Generally, compared with the olefin reactant, paraffin usually shows much lower reactivity and light olefin selectivity and, therefore, it is not a desirable feed for the catalytic cracking reaction over the zeolite catalyst for the purpose of light olefin production.

Heptane

Fluid catalytic cracking

10.3866/pku.whxb20101133

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Citations (3)

Novel Ge/Sio2 Catalysts for Non-Oxidative Dehydrogenation of Propane

Huanling Zhang Huixia Ma Xuechang Zhou Xiaolin Zhu Guowei Wang

Similar to Sn and Pb elements, Ge located at the same main group (IVA) in the periodic table, also plays an important role in non-oxidative dehydrogenation of propane, not just the promoter for Pt-based catalysts in traditional understanding. The systemic characterization of Ge/SiO2 catalysts and in-depth analysis of reactivity indicate that both metallic Ge and Ge suboxide species (such as Ge2+) are regarded as the active species for propane dehydrogenation. These active Ge species can be formed during dehydrogenation reaction, and the formation rate can be accelerated through reduction pretreatment. Notably, the dispersion of the active Ge species is also a crucial factor influencing the dehydrogenation performance, and the agglomeration of the active Ge species caused by the over-reduction leads to a fast deactivation of Ge/SiO2 catalyst.

Propane

Reactivity

Suboxide

10.2139/ssrn.4502670

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One-Step Synthesis of High-Silica ZSM-5 Zeolite with Less Internal Silicon Hydroxyl Groups: Highly Stable Catalyst for Methanol to Propene Reaction

Catalysis Letters (2021)

Huiwen Huang Chengyi Yuan Pei Si Zhong Wenyang Fan Shanshan He

Propene

ZSM-5

10.1007/s10562-021-03796-1

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Citations (4)

Insights into the reaction pathway of n-butane conversion over HZSM-5 zeolite at low temperature

Applied Catalysis A General (2019)

Pengzhao Wang Wenfang Zhang Haibo Zhu Pei Yuan Chaohe Yang

Butane

Carbonium ion

10.1016/j.apcata.2019.117135

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Citations (22)

A comparison of flow development in high density gas‐solids circulating fluidized bed downer and riser reactors

AIChE Journal (2015)

Chengxiu Wang Chunyi Li Jesse Zhu Chengxiu Wang Shahzad Barghi

Comparison of flow development in high density downer and riser reactors is experimentally investigated using fluid catalytic cracking particles with very high solids circulation rate up to 700 kg/m 2 s for the first time. Results show that both axial and radial flow structures are more uniform in downers compared to riser reactors even at very high density conditions, although the solids distribution becomes less uniform in the high density downer. Solids acceleration is much faster in the downer compared to the riser reactor indicating a shorter length of flow development and residence time, which is beneficial to the chemical reactions requiring short contact time and high product selectivity. Slip velocity in risers and downers is also first compared at high density conditions. The slip velocity in the downer is much smaller than in the riser for the same solids holdup indicating less particle aggregation and better gas‐solids contacting in the downer reactors. © 2015 American Institute of Chemical Engineers AIChE J , 61: 1172–1183, 2015

Fluidized bed combustion

Residence time distribution

Fluid catalytic cracking

Particle aggregation

10.1002/aic.14728

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Citations (40)

Effects of the state of Co species in Co/Al2O3 catalysts on the catalytic performance of propane dehydrogenation

Applied Surface Science (2018)

Xiuyi Li Pengzhao Wang Haoren Wang Chunyi Li

Propane

Incipient wetness impregnation

Chemisorption

10.1016/j.apsusc.2018.02.024

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Citations (80)

Propane Dehydrogenation Over Core-Shell Structured Al <sub>2</sub>O <sub>3</sub>@Al Via Hydrothermal Oxidation Synthesis

SSRN Electronic Journal (2021)

Huanling Zhang Kai Zhang Guowei Wang Ning Tang Chunyi Li

A novel dehydrogenation catalyst, core-shell structured Al2O3@Al via hydrothermal oxidation synthesis, demonstrates good catalytic performance for propane dehydrogenation. According to the characterization results, the hydration of metallic Al powder results in the appearance of nanosheet-like AlOOH and Al(OH)3 species on the surface, which are regarded as the precursor of the active sites responsible for propane dehydrogenation. Compared with traditional Al2O3 sample, the novel Al2O3@Al catalyst with more coordinatively unsaturated Al3+ leads to enhanced formation rate of propene and shortened induction period, which can be attributed to the high density of corner and edge sites on the surface of lamella-like AlOOH and/or Al(OH)3 species. More importantly, a significantly increased selectivity to propene can also be achieved, especially by introducing Na.

Propane

Hydrothermal Synthesis

10.2139/ssrn.3947520

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Citations (0)

One-step synthesis of hierarchical Zn-ZSM-11 via a facile ZnO route

Materials Letters (2014)

Qingjun Yu Yang Li Xiaojing Meng Qiukai Cui Chunyi Li

ZSM-5

Morphology

10.1016/j.matlet.2014.03.075

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