Deactivation studies over NiO/γ-Al2O3 catalysts for partial oxidation of methane to syngas

Zhang, Yuhong; Xiong, Guoxing; Sheng, Shishan; Yang, Weishen

doi:10.1016/s0920-5861(00)00498-3

Cited by 77 publications

(45 citation statements)

References 14 publications

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“…Additionally, the levels of reactivity were all determined to be near the equilibrium levels. The Ni/Al2O3 catalyst exhibited some deactivation beginning after 13 h of reaction, which confirmed that the Ni/Al2O3 catalyst deactivates over time, as confirmed by many other previous studies [21][22][23].…”

Section: Partial Oxidation Of Chsupporting

confidence: 88%

“…Alternatively, the Ni0.5Ca2.5Al catalyst, which Figure 19. TPO results for Ni0.5Ca2.5Al and Ni0.5Mg2.5Al catalysts after CO2 reforming of CH4 at 700 ℃ for 20 h. spc-Ni/Mg-Al Trace [18] spc-Ni/Ca-Al 0.2 Ni/MgO 5.2 [22] was more easily reduced and resulted in Ni/Ca interactions being weaker, was more susceptible to deactivation via coke build-up.…”

Section: Carbon Deposition Analysismentioning

confidence: 98%

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Synthesis Gas Production via Partial Oxidation, CO₂Reforming, and Oxidative CO₂Reforming of CH₄over a Ni/Mg-Al Hydrotalcite-type Catalyst

Song¹,

Kwon²,

Epling³

et al. 2014

Clean Technology

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주제어 : 메탄부분산화, 이산화탄소 리포밍, 산화개질, 하이드로탈사이트 Abstract : Partial oxidation, CO2 reforming and the oxidative CO2 reforming of CH4 to produce synthesis gas over supported Ni hydrotalcite-type (Ni0.5Mg2.5Al catalyst) catalysts were carried out and the effects of metal supports (i.e.; Mg and Ca) on the formation of a stable double-layer structure on the catalysts were evaluated. The CH4 reforming stability was determined to be affected by the differences in the interaction strength between the active Ni ions and support metal ions. Only a Ni-Mg-Al composition produced a highly stable hydrotalcite-type double-layered structure; while the Ni-Ca-Al-type composition did not. Such structure provides excellent stability for the catalyst (-80% efficiency) as confirmed by the long-term CO2 reforming test (-100 h), while the Ni-Ca-Al catalyst exhibited deactivation phases starting at the beginning of the reaction. The interaction strength between the active metal (Ni) and the supporting components (Mg and Al) was determined by temperature-programed reduction (TPR) analyses. The affinity was also confirmed by the TPR temperature because the Ni-Mg-Al catalyst required a higher temperature to reduce the Ni relative to the Ni-Ca-Al catalyst. The highest initial activity for synthesis gas production was observed for the Ni0.5Ca2.5Al catalyst; however, this activity decreased quickly due to coke formation. The Ni0.5Mg2.5Al catalyst exhibited a high reactivity and was more stable than the other catalysts because it had a higher resistance to coke formation.

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Section: Partial Oxidation Of Chsupporting

confidence: 88%

Section: Carbon Deposition Analysismentioning

confidence: 98%

Synthesis Gas Production via Partial Oxidation, CO₂Reforming, and Oxidative CO₂Reforming of CH₄over a Ni/Mg-Al Hydrotalcite-type Catalyst

Song¹,

Kwon²,

Epling³

et al. 2014

Clean Technology

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“…Many researchers have reported that the sol-gel method can be used for synthesis of supported metal catalysts with high, uniform and stable metal dispersion [8,9]. For example, it has been reported that nickel-alumina synthesized by sol-gel method has more stable support structure and higher nickel dispersion than those catalysts synthesized by conventional methods such as impregnation [5].…”

Section: Introductionmentioning

confidence: 99%

The influence of nickel loading on reducibility of NiO/Al<sub>2</sub>O<sub>3</sub> catalysts synthesized by sol-gel method

Zangouei

Moghaddam

Arasteh

2010

Chem. Eng. Res. Bull.

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Abstract:The sol-gel method was used to synthesize nickel-alumina catalysts with various nickel loadings. Chemical and physical properties of support and supported nickel were characterized by TGA, DTA, EDX, SEM, BET, XRD and TPR techniques. Calcination temperature (500 • C) was determined by performing thermogravimetric analysis (TGA) and differential thermal analysis (DTA) on the samples. Energy dispersive X-ray (EDX) was used to determine the actual content of nickel on alumina. N 2 adsorption test revealed that the specific surface area varied between 550 and 223 m 2 /g for pure alumina and 30%Ni/Al, respectively. X-ray diffraction (XRD) patterns showed no peaks due to NiO species and NiO species were well dispersed on the support by formation of NiAl 2 O 4 phase. Temperature-programmed reduction (TPR) indicated that the nickel species mainly presented in NiAl 2 O 4 phase and small amount of NiO. In the 20 percent nickel loading, the surface NiAl 2 O 4 phase, which is between NiO and bulk NiAl 2 O 4 phases in terms reducibility, was formed considering as a successful result.

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“…Due to their particular structural and morphological properties, transition aluminas have been applied widely in the catalysis field [2][3][4]. The performance of conventional alumina is, however, frequently limited due to uncontrolled porosity, which induces deactivation by coking and plugging and hinders the diffusion of reactants and products [5][6][7]. Most catalysts based on mesostructured alumina exhibit higher catalytic activity than those based on conventional alumina [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Mesoporous transition alumina with uniform pore structure synthesized by alumisol spray pyrolysis

Liu

2010

Chemical Engineering Journal

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a b s t r a c tMesoporous transition alumina was prepared by spray pyrolysis of an alumisol precursor, without the use of structure-directing reagents. The prepared alumina exhibited a well-defined mesoporous structure with narrow pore size distribution (3.0-4.7 nm). Preparation temperature played a major role in the phase formation and the porosity of prepared alumina. The phase transformation of boehmite to ␥-Al 2 O 3 andAl 2 O 3 was observed at 800 and 1200• C, respectively. An increase in preparation temperature resulted in a decrease in surface area and pore volume and an increase in pore size. Longer residence time promoted the crystallinity of prepared alumina effectively, but it also led to the formation of particles with smaller surface area, lower pore volume, larger pore size, and broader pore size distribution. Additionally, while alumisol concentration had little effect on the surface area, its reduction led to a decrease in pore volume and pore size and caused the formation of bimodal pore size distribution. The as-prepared alumina also exhibited excellent thermal stability, showing great application potential for industry.

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Deactivation studies over NiO/γ-Al2O3 catalysts for partial oxidation of methane to syngas

Cited by 77 publications

References 14 publications

Synthesis Gas Production via Partial Oxidation, CO₂Reforming, and Oxidative CO₂Reforming of CH₄over a Ni/Mg-Al Hydrotalcite-type Catalyst

Synthesis Gas Production via Partial Oxidation, CO₂Reforming, and Oxidative CO₂Reforming of CH₄over a Ni/Mg-Al Hydrotalcite-type Catalyst

The influence of nickel loading on reducibility of NiO/Al<sub>2</sub>O<sub>3</sub> catalysts synthesized by sol-gel method

Mesoporous transition alumina with uniform pore structure synthesized by alumisol spray pyrolysis

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Deactivation studies over NiO/γ-Al2O3 catalysts for partial oxidation of methane to syngas

Cited by 77 publications

References 14 publications

Synthesis Gas Production via Partial Oxidation, CO2Reforming, and Oxidative CO2Reforming of CH4over a Ni/Mg-Al Hydrotalcite-type Catalyst

Synthesis Gas Production via Partial Oxidation, CO2Reforming, and Oxidative CO2Reforming of CH4over a Ni/Mg-Al Hydrotalcite-type Catalyst

The influence of nickel loading on reducibility of NiO/Al<sub>2</sub>O<sub>3</sub> catalysts synthesized by sol-gel method

Mesoporous transition alumina with uniform pore structure synthesized by alumisol spray pyrolysis

Contact Info

Product

Resources

About

Synthesis Gas Production via Partial Oxidation, CO₂Reforming, and Oxidative CO₂Reforming of CH₄over a Ni/Mg-Al Hydrotalcite-type Catalyst

Synthesis Gas Production via Partial Oxidation, CO₂Reforming, and Oxidative CO₂Reforming of CH₄over a Ni/Mg-Al Hydrotalcite-type Catalyst