Mono- and bimetallic catalysts for the steam reforming of glycerol based on (Cox,Ni1-x)3Si2O5(OH)4 phyllosilicate nanoscrolls

IF 4.8 3区材料科学 Q1 CHEMISTRY, APPLIED

Microporous and Mesoporous Materials Pub Date : 2025-02-21 DOI:10.1016/j.micromeso.2025.113552

E.K. Khrapova, Sh. Omarov, A.A. Ivanova, D.A. Kirilenko, Yu. Kukushkina, A.A. Krasilin

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Abstract

Glycerol steam reforming is one of the potential method for hydrogen production is. Nanocomposites based on transition metal phyllosilicates may serve as promising candidates for the role of catalysts in this process. In the present work, Ni- Co-phyllosilicates with a pecoraite-like structure were studied. For the first time, a monometallic Co-catalyst (x = 1) and a bimetallic Ni-Co-catalyst (x = 0.4) were obtained and compared in a catalytic reaction of steam reforming of glycerol with a monometallic Ni-catalyst (x = 0) based on a nanotubular phyllosilicate with the general stoichiometric formula (Co_x,Ni_1-x)₃Si₂O₅(OH)₄. A series of physicochemical methods revealed differences in crystalline and porous structure, morphology of phyllosilicates, stability of porosity during reduction, and size and localization of metal nanoparticles. The catalysts were metal particles with dimensions of 9.6 ± 0.1 nm (x = 0), 11.2 ± 0.1 nm (x = 0.4), and 18.8 ± 0.4 nm (x = 1), dispersed in a phyllosilicate matrix as the support. For the sample with x = 0.4, the metal particles were a homogeneous NiCo alloy. This sample demonstrated a synergistic effect, which was manifested in an increase in glycerol conversion and hydrogen yield over time-on-stream at 600 °C as well as in higher stability and a lower tendency to coking in compared to monometallic samples. The identified features of the studied systems (increase in the homogeneity of the NiCo alloy during the test, oxidation and blocking of Co nanoparticles inside the phyllosilicate channels) made it possible to explain the observed differences in the catalytic behavior in the steam conversion of glycerol.

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甘油蒸汽转化是一种潜在的制氢方法。基于过渡金属绿硅酸盐的纳米复合材料有可能成为该过程中的催化剂。在本研究中，研究人员研究了具有白云石状结构的镍-钴-方硅酸盐。在甘油蒸汽转化的催化反应中，首次获得了单金属 Co 催化剂（x = 1）和双金属 Ni-Co 催化剂（x = 0.4），并与基于纳米管状辉绿硅酸盐的单金属 Ni 催化剂（x = 0）进行了比较，后者的化学计量学通式为 (Cox,Ni1-x)3Si2O5(OH)4 。一系列物理化学方法揭示了结晶和多孔结构、植硅酸盐的形态、还原过程中孔隙率的稳定性以及金属纳米颗粒的尺寸和定位等方面的差异。催化剂的金属颗粒尺寸分别为 9.6 ± 0.1 nm（x = 0）、11.2 ± 0.1 nm（x = 0.4）和 18.8 ± 0.4 nm（x = 1），分散在作为支撑物的植硅酸盐基质中。在 x = 0.4 的样品中，金属颗粒是均匀的镍钴合金。与单金属样品相比，该样品具有协同效应，表现为在 600 °C 下，随着时间的推移，甘油转化率和氢气产量增加，稳定性提高，结焦倾向降低。所研究体系的特征（镍钴合金在试验过程中的均匀性增加、钴纳米颗粒在植硅体通道内的氧化和阻塞）可以解释在蒸汽转化甘油过程中观察到的催化行为差异。

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来源期刊

Microporous and Mesoporous Materials 化学-材料科学：综合

CiteScore

10.70

自引率

5.80%

发文量

649

审稿时长

26 days

期刊介绍： Microporous and Mesoporous Materials covers novel and significant aspects of porous solids classified as either microporous (pore size up to 2 nm) or mesoporous (pore size 2 to 50 nm). The porosity should have a specific impact on the material properties or application. Typical examples are zeolites and zeolite-like materials, pillared materials, clathrasils and clathrates, carbon molecular sieves, ordered mesoporous materials, organic/inorganic porous hybrid materials, or porous metal oxides. Both natural and synthetic porous materials are within the scope of the journal. Topics which are particularly of interest include: All aspects of natural microporous and mesoporous solids The synthesis of crystalline or amorphous porous materials The physico-chemical characterization of microporous and mesoporous solids, especially spectroscopic and microscopic The modification of microporous and mesoporous solids, for example by ion exchange or solid-state reactions All topics related to diffusion of mobile species in the pores of microporous and mesoporous materials Adsorption (and other separation techniques) using microporous or mesoporous adsorbents Catalysis by microporous and mesoporous materials Host/guest interactions Theoretical chemistry and modelling of host/guest interactions All topics related to the application of microporous and mesoporous materials in industrial catalysis, separation technology, environmental protection, electrochemistry, membranes, sensors, optical devices, etc.