Introduction Of Mg Research Articles

Effects of Trace Additions of Magnesium on Microstructure and Properties of Fe–36Ni Invar Alloy

Low‐thermal‐expansion alloys play a crucial role in high‐precision instruments and devices. Simultaneously improving mechanical performance and keeping or even decreasing low thermal expansion behavior are urgently required for their industrial application. Herein, a new attempt to treat Fe–36Ni Invar alloy by adding trace magnesium (Mg) in a concentration ranging from 0 wt% to 0.0030 wt% (similarly hereinafter) is conducted. The introduction of Mg results in grain refinement and an increase in the volume fraction of the annealing twins. Compared with the Mg‐free sample, the coefficient of thermal expansion (CTE) of 0.0030% Mg alloy is significantly decreased by more than 20%, which is mainly related to lattice distortion and matrix purification. The yield strength of 0.0030% Mg alloy improves by 10% with respect to Mg‐free alloy, because of grain boundary strengthening and solid‐solution strengthening. The study may lay the basis for a better understanding of the application of Mg in low‐thermal‐expansion alloys.

Electron Redistribution Enables Redox-Resistible Li6 PS5 Cl towards High-Performance All-Solid-State Lithium Batteries.

Sulfide electrolytes with high ionic conductivity hold great promise for all-solid-state lithium batteries. However, the parasitic redox reactions between sulfide electrolyte and Li metal result in interfacial instability and rapid decline of the battery performance. Herein, a redox-resistible Li6 PS5 Cl (LPSC) electrolyte is created by regulating the electron distribution in LPSC with Mg and F incorporation. The introduction of Mg triggers the electron agglomeration around S atom, inhibiting the electron acceptance from Li, and F generates the self-limiting interface, which hinders the redox reactions between LPSC and Li metal. This redox-resistible Li6 PS5 Cl-MgF2 electrolyte therefore presents a high critical current density (2.3 times that of pristine electrolyte). The LiCoO2 /Li6 PS5 Cl-MgF2 /Li cell shows an outstanding cycling stability (93.3 %@100 cycles at 0.2 C). This study highlights the electronic structure modulation to address redox issues on sulfide-based lithium batteries.

Electron Redistribution Enables Redox‐Resistible Li6PS5Cl towards High‐Performance All‐Solid‐State Lithium Batteries

AbstractSulfide electrolytes with high ionic conductivity hold great promise for all‐solid‐state lithium batteries. However, the parasitic redox reactions between sulfide electrolyte and Li metal result in interfacial instability and rapid decline of the battery performance. Herein, a redox‐resistible Li6PS5Cl (LPSC) electrolyte is created by regulating the electron distribution in LPSC with Mg and F incorporation. The introduction of Mg triggers the electron agglomeration around S atom, inhibiting the electron acceptance from Li, and F generates the self‐limiting interface, which hinders the redox reactions between LPSC and Li metal. This redox‐resistible Li6PS5Cl‐MgF2 electrolyte therefore presents a high critical current density (2.3 times that of pristine electrolyte). The LiCoO2/Li6PS5Cl‐MgF2/Li cell shows an outstanding cycling stability (93.3 %@100 cycles at 0.2 C). This study highlights the electronic structure modulation to address redox issues on sulfide‐based lithium batteries.

Positive temperature coefficient of resistance of Mg-GeO2 nanowire array film

Here, glancing angle deposition is employed to synthesize the undoped GeO2 and Mg-doped (0.4 and 0.8 at. %) GeO2 nanowires (NWs) on a Si substrate. The microscopic images show the formation of the NW-like morphology of the grown materials. The gradual decrease in the average ratio of length to diameter depicts the worsening of the formation of NWs with the incorporation of Mg into the GeO2 host lattice. This also affects the crystallinity characteristics of the materials, which have been demonstrated from the selected area electron diffraction (SAED) pattern of the materials. The polycrystallinity nature of undoped GeO2 NWs changes to amorphous due to the introduction of Mg, which has been confirmed from both the obtained SAED and x-ray diffraction patterns of the samples. The presence of Mg was confirmed from the obtained broad bands at 473 and 437 cm−1 in the Fourier transmission spectrum of the doped samples. The increasing conductance with the temperature of Au/undoped GeO2 devices can be explained by the thermionic emission process, whereas the Mg-GeO2 device shows an overall decrease in conductance with increasing temperature. We have ascribed the origin of this abnormal conductance as the positive temperature coefficient of resistance, which is one of the first reports, due to the generation of random grain boundaries and enormous electron trapping at the Au/Mg-GeO2 NW junction. Furthermore, the undoped GeO2 NW device shows good temperature-dependent conductivity as well as stability compared to the doped one.

Adjusting physicochemical and cytological properties of biphasic calcium phosphate by magnesium substitution: An in vitro study

Biphasic calcium phosphate (BCP) is a highly study bone defect repair material with adjustable degradation, perfect osteoconduction and good osteoinduction. As one of the essential trace elements, magnesium (Mg) possesses the abilities of pro-osteogenesis and pro-angiogenesis. Therefore, Mg doping may further expand the application of BCP in bone defect repair, but few studies focus on promoting the osteogenesis and angiogenesis of BCP simultaneously by Mg doping, and the optimal doping amount of Mg remains to be explored. In this study, the physicochemical and biological properties of BCP scaffold affected by Mg doping were systematically study. Results showed that Mg doping enhanced the sintering of BCP scaffold, resulting in the decrease of degradation rate at the initial soaking period. However, the introduction of Mg damaged the lattice stability of BCP, leading to the increase of BCP degradation rate at the later soaking period. BCP scaffolds with Mg doping content ≥3 mol.% could achieve a long-term sustained release of Mg. The ion microenvironment created by Mg-doped scaffolds was simultaneously conducive to the osteogenic differentiation of stem cells and the enhanced angiogenic activity of endothelial cells. The scaffold doped with 5 mol.% of Mg (Mg5–S) showed the highest efficiency in promoting osteogenic differentiation. Mg-doped BCP scaffolds with a doping content ≥3 mol.%, especially Mg5–S, significantly improved the proliferation and angiogenic differentiation of endothelial cells. Based on these, we believe that the optimal doping content of Mg in BCP is 5 mol.%, and Mg5–S has great application potential in bone defect repair.

Promoting effect of magnesium introduced in Li/Ni sites of LiNiO2 for lithium-ion batteries

The high cost of Co strongly drives the increase of Ni fraction and the decline of Co ingredient in commercial Ni-rich cathodes, generating convergence towards LiNiO2 (LNO). However, pure LNO suffers from poor cycling and rate performance due to severe Li+/Ni2+ cation mixing and structural degradation. Herein, a series of Mg-doped LNO are synthesized to elucidate the effect of the Mg dopant. It is demonstrated that around 2.21% and 2.79% of Mg2+ ions occupy the Li and Ni sites, respectively. The presence of Mg in the Li sites reduces Li+/Ni2+ cation mixing, enlarges the c-axis lattice, and acts as pillar ions, which facilitates Li+ diffusion and significantly improves the rate performance of Mg-doped LNO. Additionally, the introduction of Mg in the Li/Ni sites disturbs Li/vacancy ordering in the Li layers and electronic rearrangements in the Ni layers, which inhibits the two-phase separation transition at the end of charge. Furthermore, the pillaring effect of Mg2+ ions in Li sites and the stabilizing effect of Mg2+ ions in Ni sites at the end of delithiation alleviate the drastic c-axis shrinkage. Therefore, the optimized Mg-doped LNO exhibits reversible structure evolution, less microcracks, stable impedance growth, and excellent electrochemical performance during long-term cycling.

Effect of Single Atom Doping on Structural, Electronic and Magnetic Properties of Hexagonal Silicon Carbide (4H-SiC) for Spintronic Application: A first principle study

In this paper, the structural geometry, electronic and magnetic properties of single magnesium (Mg) and vanadium (V) atoms doped 4H-SiC system were investigated. For the structural geometry of each sample, the energy substitution, as well as bond length, were calculated; results obtained indicate that the bond length of Silicon-Magnesium (Si-Mg) and SiliconVanadium (Si-V) was 1.90 Å and 2.02 Å respectively, greater than that of silicon-carbon (SiC) 1.89 Å in pure SiC. This result indicates that the bond length increases due to the introduction of dopants with greater radii than that of Si. It also shows that both Mg and V doping change the structure from non-magnetic ordering to magnetic in nature. The band structure result for both undoped and doped shows the presence of valence band maximum (VBM) and conduction band minimum (CBM) around different symmetry points which indicate an indirect band gap nature. The calculated band gap of pure 4H SiC is found to be ~2.21 eV, which is at a wide band gap material range, but with the introduction of Mg and V dopants, the band gap reduced significantly to ~0.4 eV and ~0.45 eV respectively. The density of state (DOS) and projected density of state (PDOS) show the contributions of the various states in both the VBM and CBM; after doping the Fermi energy is shifted towards higher energy and enters into the conduction band, exhibiting spin polarization. Both DOS and PDOS indicated that the magnetic moments mainly come from the 2p orbitals of Si atoms and 3p for Mg dopant and 3d orbitals for V dopant. The magnetic moment for 4H-SiC/Mg and 4H-SiC/V was calculated to be 2.23 μB and 3.24 μB.

First-principles calculations to investigate structural, electronic, optical and mechanical properties of Mg-doped CaMoO3 cubic perovskites for fuel cell applications

The structural, optical, electrical, and mechanical characteristics of pure and Mg-doped CaMoO3 perovskites materials were examined in a first-principle research based on density functional theory. The current study employs the PBE (Perdew Burke-Ernzerhof) exchange co-relational functional of GGA along with the USP (Ultra-soft Pseudo-potential) plan wave and CASTEP (Cambridge Serial Total Energy Package) code (Generalized Gradients Approximation). The impact of Mg on the structural, optical, electrical, and mechanical characteristics of CaMoO3 is examined using a generalized gradient approximation (GGA) and an ultra-soft pseudo-potential. After adding Mg to the Mo site, it is discovered that the band gap of CaMoO3 with Mg doping has significantly decreased. According to the DFT investigation, Mg is an ideal material to lower CaMoO3's band gap. The volume of crystal cells similarly fell from 61.99 to 57.94 A3 with the addition of Mg due to the difference in ionic radii between Mo and Mg. The incorporation of Mg in CaMoO3 results in a highly stable material, which is demonstrated by the as-calculated negative cohesive energy values, according to the as-obtained elastic constants (Cij). The elastic constants, ductility, elastic moduli, and elastic anisotropy of pure and Mg-doped CaMoO3 cubic perovskite materials have also been investigated. These findings demonstrate that Mg doping successfully raises CaMoO3's elastic moduli. The Mg-doped CaMoO3 material transforms from brittle to ductile due to the introduction of Mg at sites of Mo, as computed Pugh's ratio is dropped from 2.499 to 1.995 and Poisson's ratio from 0.323 to 0.285. For both pure and Mg-doped CaMoO3, band topologies, densities of states, and charge density re-locations are also expected.

Ordered mesoporous Ni–Mg–Al2O3 as an effective catalyst for CO2 reforming of CH4

The Ni based catalysts have been considered as promising candidates for the CO2 reforming of CH4 (CRM). However, they have suffered from two challenging issues of sintering and carbon accumulation. In order to overcome these drawbacks, a series of ordered mesoporous Ni-xMg-Al2O3 catalysts (x was the mole ratio of Mg/(Mg + Al)) with different Mg contents were synthesized by an improved one-pot evaporation-induced self-assembly method. The effect of Mg on the physicochemical property and catalytic performance of Ni-xMg-Al2O3 catalysts for CRM was investigated. The catalysts were characterized by XRD, H2-TPR, XPS, TEM, NH3-TPD, and N2 adsorption-desorption at low temperature. The results showed that the introduction of Mg into the Ni–Al2O3 maintained well the ordered mesoporous structure and enhanced the interaction between Ni and Al2O3, which could effectively restrict the thermal agglomeration of Ni nanoparticles. In addition, the acid sites were decreased with the introduction of Mg, which was beneficial for resistance to carbon accumulation, and then improving the CRM performance. Among Ni-xMg-Al2O3 catalysts, Ni–3Mg–Al2O3 presented the highest catalytic activity and stability. Under the conditions of 750 °C and GHSV = 32000 mL g−1 h−1, the conversion of CH4 and CO2 could reach 81.97% and 89.11% without deactivation for 20 h.

Mg enhances the catalytic selectivity and stability of mordenite for carbonylation of dimethyl ether

Mg species were introduced into the MOR zeolite to adjust its acid sites distribution, which has a great impact on the reaction of DME carbonylation. The introduction of Mg had a vital effect on the MOR structure, as it decreased specific surface area and pore volume. When Mg ion exchanged into both the 12MR channel and 8MR channel of MOR zeolite, the strong acid sites dramatically decreased, especially for the Brønsted acid sites in the 12MR channel. Mg modification inhibited most of active sites for side reactions, whereas decreasing a few active sites for carbonylation. This caused a little loss of activity, but the higher selectivity to methyl acetate (MA) product. Furthermore, Mg-MOR exhibited superior stability in the reaction of DME carbonylation. As a result, the MA yield on Mg-MOR was 3.8 times as higher as that on H-MOR.

Glucose Hydrogenolysis into 1,2-Propanediol Using a Pt/deAl@Mg(OH)2 Catalyst: Expanding the Application of a Core-Shell Structured Catalyst.

To substitute fossil resources, it is necessary to investigate the conversion of biomass into 1,2-propanediol (1,2-PDO) as a high-value-added chemical. The Pt/deAl-Beta@Mg(OH)2 catalytic system is designed to obtain a higher 1,2-PDO production yield. The optimal yield of 1,2-PDO is 34.1%. The unique shell-core structure of the catalyst demonstrates stability, with a catalytic yield of over 30% after three times of use. The primary process path from glucose to 1,2-PDO, glucose-hexitol-1,2-PDO, is speculated by the experiments of intermediate product selectivity. The alkaline catalytic mechanism of the reaction process is elucidated by studying catalyst characterization and analyzing different time courses of products. The introduction of Mg(OH)2 improves the target yield by promoting the isomerization from glucose to fructose and retro-aldol condensation (RAC) conversion, with pseudo-yield increases of 76.1% and 42.1%, respectively. By studying the processes of producing lactic acid and 1,2-PDO from glucose, the glucose hydrogenolysis flow chart is improved, which is of great significance for accurately controlling 1,2-PDO production in industrial applications. The metal, acid, and alkali synergistic catalytic system constructed in this paper can provide a theoretical basis and route reference for applying biomass conversion technology in practice.

Peroxymonosulfate activation by Mg-introduced Fe-N carbon nanotubes to accelerate sulfamethoxazole degradation: Singlet oxygen-dominated nonradical pathway

Here, Mg-introduced Fe-N carbon nanotube catalysts (FeMg@NCNTs) were prepared for peroxymonosulfate (PMS). Experiments suggested that the introduction of Mg improved the removal of sulfamethoxazole (SMX) and found a transformation from the original radical pathway to a nonradical pathway dominated by singlet oxygen (1O2). XPS characterization demonstrated an enhanced pyridinic N content with the introduction of Mg. SMX degradation was not inhibited by pH, coexisting ions, or humic acid (HA). The free radical scavengers and electron paramagnetic resonance (EPR) indicate that the primary reactive substance was 1O2. Experimentally, 1O2 was proven to have a predominant effect on the degradation of SMX. The concentration of 1O2 increased 6.37 times after the introduction of Mg. Four decomposition pathways and three fragile sites for SMX were proposed by DFT calculations and HPLC-MS. The toxicity estimation software tool (T.E.S.T) analyzed the intermediates with lower ecotoxicity than SMX. The different contaminants (CIP, BPA, TBBPA, TCS, TC and Rh B) had a removal rate of more than 99% at 60 min except TC. The removal rates of SMX in tap water, river water and lake water were 100%, 96.6% and 93.1% in 40 min, respectively. The SMX degradation efficiency remained good after 5 cycles of the experiment. FeMg@NCNTs hydrogel catalyst continuous flow device exceeded 90% within 15 h for SMX removal efficiency and the Rh B is always running at 99% removal rate. In conclusion, this work provides a singlet oxygen-dominated non-radical pathway activating material and provides a new option for antibiotic wastewater degradation and practical applications.

Ablation behaviour and mechanism of Mg-modified ZrC-SiC composite in plasma ablation flame

A fully dense Mg-modified ZrC-SiC composite was prepared by spark plasma sintering. The microstructure, phase evolution and ablation behaviour of the composite were investigated. Results show that the formation of a viscous Mg-Si-O liquid phase, as MgSiO3 and Mg2SiO4 were incorporated into molten SiO2, significantly improved the ablation resistance of composite whose mass ablation rate (−5.26 μg/s) and linear ablation rate (0.03 µm/s) were both lower than those of the monolithic ZrC-SiC composite (8.21 μg/s and 2.54 µm/s, respectively). Furthermore, the introduction of Mg effectively restrained the martensitic transformation from t-ZrO2 to m-ZrO2, strengthening the integrity of the oxide layer.

Effects of Mg Doping at Different Positions in Li-Rich Mn-Based Cathode Material on Electrochemical Performance.

Li-rich Mn-based layered oxides are among the most promising cathode materials for next-generation lithium-ion batteries, yet they suffer from capacity fading and voltage decay during cycling. The electrochemical performance of the material can be improved by doping with Mg. However, the effect of Mg doping at different positions (lithium or transition metals) remains unclear. Li1.2Mn0.54Ni0.13Co0.13O2 (LR) was synthesized by coprecipitation followed by a solid-state reaction. The coprecipitation stage was used to introduce Mg in TM layers (sample LR-Mg), and the solid-state reaction (st) was used to dope Mg in Li layers (LR-Mg(st)). The presence of magnesium at different positions was confirmed by XRD, XPS, and electrochemical studies. The investigations have shown that the introduction of Mg in TM layers is preferable in terms of the electrochemical performance. The sample doped with Mg at the TM positions shows better cyclability and higher discharge capacity than the undoped sample. The poor electrochemical properties of the sample doped with Mg at Li positions are due to the kinetic hindrance of oxidation of the manganese-containing species formed after activation of the Li2MnO3 component of the composite oxide. The oxide LR-Mg(st) demonstrates the lowest lithium-ion diffusion coefficient and the greatest polarization resistance compared to LR and LR-Mg.

Sulfated zirconia catalysts supported on mesoporous Mg-SBA-15 with different morphologies for highly efficient conversion of fructose to 5-hydroxymethylfurfural

In this work, the novel acid-base bi-functional mesoporous SBA-15 catalysts with four kinds of morphologies were synthesized by Mg incorporated and sulfated zirconia (SZ) grafted. The introduction of Mg to mesoporous SBA-15 materials significantly improves the strength of the base. And the supported SZ group exhibit effective Brønsted/Lewis acid strength. The physical and chemical properties of the prepared materials were systematically analyzed by the characterization tests of SEM, TEM, XRD, N 2 adsorption-desorption of, FT-IR, TGA, XPS, NH 3 /CO 2 -TPD and in-suit PY-IR. The obtained catalysts of SZ@Mg-SBA-15 could be applied to the fructose conversion into 5-hydroxymethylfurfural (5-HMF) with the co-solvent system of iPrOH/DMSO ( v / v = 9:1). 5-HMF was achieved under the optimal reaction condition with the highest yield of 98.6%. The result shows that the reaction of fructose dehydration into 5-HMF could be caused by the combination of Brønsted acid site and basic site. This work developed reaction system could avoid the large use of environmentally dangerous solvents, and provides a new economical and feasible method for the large-scale conversion of fructose biomass. • Mesoporous SZ@Mg-SBA-15 catalysts were successfully synthesized. • The acid-base bifunctional sites showed synergistic effects in catalytic activity. • The highest 5-HMF yields of 98.6% can be obtained from fructose. • The developed iPrOH/DMSO co-solvent has a minimal environmental impact. • The prepared catalyst can be reused without significant loss of activity.

Metal heteroatom (Mg, Cu and Co) and porous carbon co-doped MIL-101 composites with superior acetone capture capacity

The development of highly active and stable adsorbents for volatile organic compounds (VOCs) capture is an efficient solution to address global problems in atmospheric pollution and environmental health. Herein, a metal–organic framework derived adsorbent consisting of metal heteroatom (Mg, Cu and Co) and porous carbon supported on MIL-101 framework is designed to enable high affinity for adsorbing acetone. The doped metal heteroatoms are homogeneously dispersed in the MIL-101/PC octahedron. The modification of doped metal heteroatoms improves the acetone adsorption capacity of the MIL-101/PC composite at low relative pressure. Importantly, the optimized 20%Mg@MIL-101/PC composite not only shows higher surface area (3838 m2 g−1) and pore volume (2.24 mL g−1) than MIL-101/PC, but also creates stronger active adsorption sites for acetone. As a consequence, the acetone adsorption capacity of 20%Mg@MIL-101/PC reaches 1309 mg g−1 at 288 K and 18 bar, and the saturated adsorption capacity decreases by only 12% over 10 adsorption–desorption consecutive cycles. Consequently, quantum chemistry calculation method is performed to better understand the microscopic adsorption behavior of acetone. The results of density functional theory (DFT) calculation show that the introduction of Mg can significantly improve the dipole moment of MIL-101 core and reduce its gap band energy, thus enhancing the electrostatic interaction with acetone molecule.

Mg-modified CoMo/Al2O3 with enhanced catalytic activity for the hydrodesulfurization of 4, 6-dimethyldibenzothiophene

Hydrodesulfurization of 4, 6-dimethyldibenzothiophene is of great significance for emission reduction and environmental protection. Herein, the effects of Mg addition on CoMo/Al2O3 were systematically studied for the hydrodesulfurization of 4, 6-dimethyldibenzothiophene. The CoMo/Mg-Al2O3 was formed by incorporating Mg in the alumina lattice and showed excellent hydrodesulfurization performance compared to CoMo/Mg/Al2O3 formed after deposition of Mg on the alumina surface and to CoMo/Al2O3 without introducing Mg. Experimental characterization and theoretical calculations showed that the introduction of Mg is beneficial to the formation of β-CoMoO4, which significantly promoted the production of CoMoS active sites. Meanwhile, the introduction of Mg mainly improved the medium-strong surface basic sites.

A Simple Ball Milling and Thermal Oxidation Method for Synthesis of ZnO Nanowires Decorated with Cubic ZnO2 Nanoparticles.

In this work, we propose the synthesis of ZnO nanostructures through the thermal oxidation of ball-milled powders with the introduction of Mg and Sn doping species at the preliminary step of milling. We investigate the advantages and challenges of this two steps process for the production and fabrication of highly crystalline ZnO nanowires. This simple method allows us to fabricate ZnO nanowires with a higher quality core crystal at a much lower temperature and for a shorter processing time than the state-of-the-art, and decorated with by ZnO2 nanoparticles as determined via TEM analysis. The main findings will show that the crystalline core of the nanowires is of hexagonal ZnO while the nanoparticles on the surface are ZnO2 cubic type. Generally, the method proves to be suitable for applications that require a high surface-to-volume ratio, for example, catalysis phenomena, in which the presence of zinc oxides species can play an important role.

Examination of the Deactivation Cycle of NiAl- and NiMgAl-Hydrotalcite Derived Catalysts in the Dry Reforming of Methane

The importance of the dry reforming of methane (DRM) lies in its capability to upgrade two greenhouse gases (CH4 and CO2) into synthesis gas (CO and H2), which is one of the main building block for synthesizing hydrocarbons. However, the Ni-based catalysts for DRM reaction usually have a major catalytic stability drawback. This works aims to assess the catalytic activity and stability of two Ni-based catalysts obtained from hydrotalcite (HT) precursors (i.e., NiAl-HT and NiMgAl-HT). The precursors, calcined (-c), reduced (-R) and spent samples were characterized by a series of techniques to gain insight into the influence of MgO over Ni-based catalyst in the drying reforming of methane. An in-situ ageing cycle process to speed up the deactivation of hydrotalcite-derived catalysts showed that the NiMgAl-HTc-R catalyst displayed a higher activity and resistance to coke formation (stability) than NiAl-HTc-R because of the introduction of Mg into hydrotalcite structure in the catalyst precursor. The presence of this element enhances several factors involved in the stability of Ni-based catalysts for the DRM process such as the reducibility and textural features of the catalysts, size and dispersion of Ni0 nanoparticles and also maintains a good compromise between the acid and base properties of the solid catalysts.

Syngas Production by Dry Methane Reforming over Mg Doped NiO-ZrO<sub>2</sub> Catalysts

In producing syngas, which offers environmental benefits, dry reforming of methane (DRM) could promote the installation of the future carbon tax. This reaction has been already extensively studied and nowadays, no stable catalysts are enough efficient to scale up the process to its industrialization. It has been suggested that basic sites can affect the performance of catalyst. It is known that magnesium promotes the performance of catalyst. In order to understand the effect of Mg for dry reforming of methane, NiO-MgO-ZrO2 catalysts were studied. The activity was carried out at 700 °C in a fixed-bed micro-reactor under CH4:CO2:Ar=1:1:8. It was shown that the introduction of Mg led to an unexpected decrease in the activity when compared to non-promoted catalyst. It was also shown that the surface area, pore-volume, pore diameter, and weak basicity decreased when the Mg was introduced into NiO-ZrO2 catalyst. All these properties can cause a decrease in the activity, selectivity, and stability of NiO-MgO-ZrO2 catalyst for DRM.