ZSM-23-Supported Nickel Phosphide Catalysts for n-Alkane Hydroisomerization

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL Catalysis Letters Pub Date : 2025-01-02 DOI:10.1007/s10562-024-04895-5

Tatyana S. Bogomolova, Marina Yu. Smirnova, Mikhail V. Parfenov, Svetlana V. Cherepanova, Maxim A. Panafidin, Oleg V. Klimov, Alexander S. Noskov

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Abstract

A series of supported Ni phosphide bifunctional hydroisomerization catalysts (Ni₂P/ZSM-23/Al₂O₃) was synthesized by means of Ni hypophosphite reduction at different temperatures. The structure and morphology of Ni phosphide phase were determined by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The surface chemical analysis was performed using X-ray photoelectron spectroscopy (XPS). The hydro/dehydrogenation and acid functions of catalysts were characterized by CO chemisorption, NH₃-TPD and IR-spectroscopy of adsorbed pyridine (IR-Py). The reduction of supported precursor at the temperature lying in the range of 550–650 ⁰С resulted in high activity and iso-selectivity in n-decane conversion. The reduction of the supported component at 500 ⁰C or re-reduction of ex-situ reduced and passivated catalysts at 450 ⁰C led to the formation of impurities of other Ni phosphides such as NiP and Ni₅P₄ and had a negative impact on n-decane conversion. Both the Brønsted acidity and Ni₂P dispersion of the catalysts declined with increasing Ni₂P content which were accompanied by a drop in their activity without loss of iso-selectivity.

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zsm -23负载的正构烷烃加氢异构化磷化镍催化剂

采用次亚磷酸镍在不同温度下还原的方法合成了一系列负载型磷化镍双官能团加氢异构催化剂Ni2P/ZSM-23/Al2O3。采用x射线衍射仪（XRD）和透射电镜（TEM）对磷化镍相的结构和形貌进行了表征。采用x射线光电子能谱（XPS）进行表面化学分析。通过CO化学吸附、NH3-TPD和吸附吡啶（IR-Py）的红外光谱对催化剂的加氢/脱氢和酸功能进行了表征。在550-650⁰С温度范围内负载前驱体的减少导致了正癸烷转化的高活性和同位选择性。500⁰C时负载组分的还原或450⁰C时非原位还原和钝化催化剂的再还原导致其他Ni磷化物（如NiP和Ni5P4）的杂质形成，并对正癸烷转化产生负面影响。随着Ni2P含量的增加，催化剂的Brønsted酸性和Ni2P分散度均下降，同时活性下降，但不丧失同位选择性。图形抽象

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来源期刊

Catalysis Letters 化学-物理化学

CiteScore

5.70

自引率

3.60%

发文量

327

审稿时长

1 months

期刊介绍： Catalysis Letters aim is the rapid publication of outstanding and high-impact original research articles in catalysis. The scope of the journal covers a broad range of topics in all fields of both applied and theoretical catalysis, including heterogeneous, homogeneous and biocatalysis. The high-quality original research articles published in Catalysis Letters are subject to rigorous peer review. Accepted papers are published online first and subsequently in print issues. All contributions must include a graphical abstract. Manuscripts should be written in English and the responsibility lies with the authors to ensure that they are grammatically and linguistically correct. Authors for whom English is not the working language are encouraged to consider using a professional language-editing service before submitting their manuscripts.