Propane dry reforming over highly active NiO-MgO solid solution catalyst for synthesis gas production

Ahadzadeh, Mohammadreza; Alavi, Seyed Mehdi; Rezaei, Mehran; Akbari, Esmaeil

doi:10.1016/j.mcat.2022.112325

Cited by 12 publications

(7 citation statements)

References 30 publications

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“…The formation of a solid solution can favor the homogeneous Ni distribution in the NiO/MgO catalyst, despite a NiO loading as high as 20 wt%. Incidentally, such a high NiO loading is fairly profitable to achieve better catalytic performance in the dry reforming process, as already evidenced by a few researchers [24,27]. On the spectrum of the reduced NiO/MgO sample, there appears a small protrusion at the foot of the chief peak of MgO at 2θ of 42.916°, the position of which is basically in concordance with the dominant peak at 44.507° of metallic Ni belong to PDF #04-0850.…”

Section: Discussionsupporting

confidence: 55%

Promotion Effect of H2S at High Concentrations on Catalytic Dry Reforming of Methane in Sour Natural Gas

Ni,

Jia,

et al. 2024

Catalysts

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The effect of high concentrations of H2S in sour natural gas on the catalytic dry reforming of methane (DRM) process has seldom been studied previously in the literature. Herein, several types of catalysts, including MgO, NiO/MgO, and LaNiO3 in different states, were prepared for conducting DRM at 800 °C and 0.1 MPa in a feed of 20 vol% CO2 and 20 vol% CH4, and their catalytic performance under conditions of the absence and presence of H2S was compared. A promotion effect of increasing H2S concentration on both the conversions of CO2 and CH4 and the molar yields of CO and H2 was observed on all the catalysts and was particularly remarkable on the MgO and the pristine NiO/MgO. For NiO/MgO, the addition of 15 vol% H2S increased the conversion of CH4 from 6.92% to 26.86% and CO2 from 9.15% to 42.10%. While there was a significant decline in the catalytic activity of the reduced NiO/MgO and LaNiO3 catalysts after adding H2S, moderate reactant conversions were still sustained. The results of process analysis and catalyst structure characterization suggest that H2S participation can contribute to the increment in CO2 and CH4 conversion, and active S-adsorbed species may play the key role of catalysis in reactions involving H2S.

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Section: Discussionsupporting

confidence: 55%

Promotion Effect of H2S at High Concentrations on Catalytic Dry Reforming of Methane in Sour Natural Gas

Ni,

Jia,

et al. 2024

Catalysts

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“…Ye et al observed that titania-based catalysts showed strong chemisorption of CO 2 , which was retained considerably at higher temperatures between 600 and 1200 °C. The CO 2 adsorption over titania-based catalysts is illustrated in Table , and three CO 2 desorption temperature regions of basic sites were recognized over titania-based catalysts. − The first region is the weak basic sites of CO 2 between temperatures 35 and 325 °C, likely related to bicarbonate species, − while the stronger basic sites at higher-temperature CO 2 -TPD at 325–725 °C represented the bidentate carbonate intermediate with strong sites of CO 2 linked with the less oxide coordination state of titania-based catalysts and were likely related to basic surface oxygen anions. ,,− The highest temperature region >725 °C represented the oxycarbonate, which is attributed to strong basic sites and favors high-temperature decomposition. , Specifically, the addition of noble and transition metals to titania-based catalysts led to significantly more basic sites, indicated by the more than 1.7–2.7-fold increase in peak intensity between 35 and 725 °C incorporated with TiO 2 , compared to the original support. The amounts of basic sites decreased in the following order TiO 2 < Zr/Ti < Ir/Ti < Al/Ti < V/Ti, as shown in Table .…”

Section: Resultsmentioning

confidence: 99%

“…The CO 2 adsorption over titania-based catalysts is illustrated in Table 1 , and three CO 2 desorption temperature regions of basic sites were recognized over titania-based catalysts. 37 − 39 The first region is the weak basic sites of CO 2 between temperatures 35 and 325 °C, likely related to bicarbonate species, 38 − 42 while the stronger basic sites at higher-temperature CO 2 -TPD at 325–725 °C represented the bidentate carbonate intermediate with strong sites of CO 2 linked with the less oxide coordination state of titania-based catalysts and were likely related to basic surface oxygen anions. 38 , 39 , 43 − 46 The highest temperature region >725 °C represented the oxycarbonate, which is attributed to strong basic sites and favors high-temperature decomposition.…”

Section: Resultsmentioning

confidence: 99%

Enhancing CO and H₂ Production in Propane Dry Reforming in Excess of CO₂

Al-Shafei,

Aljishi,

Alasseel

et al. 2024

ACS Omega

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This study focuses on addressing the challenges in the dry reforming of propane, a process historically marked by low syngas yields and only moderate conversions of CO 2 and propane. The primary objective was to enhance CO 2 utilization and boost the selectivity of syngas (CO and H 2 ) production using titania-based catalysts. For synthesizing these catalysts, an impregnation method was employed with subsequent characterization through X-ray diffraction (XRD), N 2 adsorption−desorption, ammonia temperature-programmed desorption (TPD), and hydrogen temperature-programmed reduction (TPR). The titania-based catalysts generally possess weak acidic strength, with each catalyst displaying a unique reduction profile. The dry reforming process using these catalysts resulted in varying levels of propane conversion, with V/Ti, Ir/Ti, Al/Ti, and Zr/Ti catalysts showing distinct efficiencies. Notably, the Ir/Ti and V/Ti oxide catalysts achieved the lowest selectivity for generating intermediate byproducts such as methane, ethane, ethylene, and propylene while successfully promoting higher syngas CO and H 2 production alongside stable propane conversion. When exposed to excess CO 2 , each catalyst consumed differing amounts of CO 2 molecules. Particularly, the Ir/ Ti and V/Ti oxide catalysts demonstrated enhanced activity in promoting CO 2 reactions with intermediate radical species, facilitating carbon−carbon (C−C) bond dissociation and leading to increased syngas production. This study offers valuable insights into the potential of titania-based catalysts in improving the efficiency and selectivity of propane dry reforming processes for blue hydrogen.

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“…The properties of the ternary NiO-CeO 2 -MgO composite systems are defined by a complex interaction between all three components. MgO can interact with NiO with the formation of Ni x Mg 1−x O solid solutions [32][33][34][35]. This contributes to the stabilization of NiO species at elevated temperatures.…”

Section: Introductionmentioning

confidence: 99%

Ternary Ni-Ce-Mg-O Composites: In-Depth Optical Spectroscopy Study and Catalytic Performance in CO Oxidation

2023

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In the present work, ternary Ni-Ce-Mg-O composites containing various amounts of NiO and CeO2 were synthesized via a sol-gel approach. Aqueous solutions of cerium and nickel nitrates were introduced at the stage of hydrolysis of magnesium methoxide, which allowed for avoiding the use of expensive organic precursors. It was revealed that the properties of the composites were defined by the complex interactions between NiO, CeO2, and MgO components. In order to perform an in-depth characterization of the prepared samples, diffuse reflectance UV–vis and Raman spectroscopies were applied. According to the results of these methods, Mg2+ ions did not substitute Ce4+ ions in the CeO2 lattice. However, in the case of the Ni-containing samples, approximately 2–3% of the Ce4+ ions were substituted by Ni2+, thus resulting in the formation of vacancies in the CeO2. The strong interaction of NiO with MgO predictably resulted in the formation of NixMg1−xO solid solutions. When the NiO content in the sample was 20 wt%, the composition of the formed solid solution was estimated to be Ni0.60Mg0.40O. In addition, the presence of CeO2 affected the texture of the ternary composites, thus leading to a slight decrease in the specific surface area. The catalytic performance of the Ni-Ce-Mg-O composites was examined in the CO oxidation reaction under prompt thermal aging conditions. The choice of reaction conditions was due to a high sensitivity of the CO oxidation response toward the available metal surface area and possible metal-support interactions.

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Propane dry reforming over highly active NiO-MgO solid solution catalyst for synthesis gas production

Cited by 12 publications

References 30 publications

Promotion Effect of H2S at High Concentrations on Catalytic Dry Reforming of Methane in Sour Natural Gas

Promotion Effect of H2S at High Concentrations on Catalytic Dry Reforming of Methane in Sour Natural Gas

Enhancing CO and H₂ Production in Propane Dry Reforming in Excess of CO₂

Ternary Ni-Ce-Mg-O Composites: In-Depth Optical Spectroscopy Study and Catalytic Performance in CO Oxidation

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Propane dry reforming over highly active NiO-MgO solid solution catalyst for synthesis gas production

Cited by 12 publications

References 30 publications

Promotion Effect of H2S at High Concentrations on Catalytic Dry Reforming of Methane in Sour Natural Gas

Promotion Effect of H2S at High Concentrations on Catalytic Dry Reforming of Methane in Sour Natural Gas

Enhancing CO and H2 Production in Propane Dry Reforming in Excess of CO2

Ternary Ni-Ce-Mg-O Composites: In-Depth Optical Spectroscopy Study and Catalytic Performance in CO Oxidation

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Enhancing CO and H₂ Production in Propane Dry Reforming in Excess of CO₂