Effect of secondary additives on the properties of vanadium‑aluminum mixed oxide tableted catalysts used in the oxidation of propane

Baldovino-Medrano, Víctor G.; Farin, Benjamin; Gaigneaux, Éric M.

doi:10.1016/j.powtec.2021.03.067

Cited by 9 publications

(13 citation statements)

References 62 publications

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“…1 In general, more detailed discussion on the shaping of zeolites can be found on the seminal review by Mitchell et al 1 In the case of other catalysts, previous efforts to analyze the effects of shaping by tableting additives on the properties of oxidation catalysts; namely, bismuth molybdates, mixed vanadium−aluminum (hydr)oxides, and γ-MnO 2 , have been published. [24][25][26]28 In the case of bismuth molybdates and mixed vanadium− aluminum (hydr)oxides, graphite was essential to produce tablets because of its lubricating action during the operation. The tablets produced with 1.0 wt.% graphite exhibited the highest mechanical resistance.…”

Section: Manufacture Of Technical Catalystsmentioning

confidence: 99%

“…Instead, most authors simply state their mixing procedures 8,33 while very few others explain the results of their trial and error tests for finding conditions that facilitate catalysts shaping. 26 1.3.2.1. Preparation of Dry Mixtures for Catalytic Formulations.…”

Section: Manufacture Of Technical Catalystsmentioning

confidence: 99%

“…Figure 23 shows a qualitative assessment of the effect of water loading on pastes produced to make MnO 2 based extrudates for which kaolin clay was used as additive. 26 The moisture of the paste also plays a role in the porosity of the produced extrudates henceforth altering mechanical resistance. Indeed, the literature reports that controlling moisture content can vary porosity in the shaped bodies between 30% and 60%.…”

Section: Wet Mixturesmentioning

confidence: 99%

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Elements of the Manufacture and Properties of Technical Catalysts

García-Sánchez

Medrano

2023

Ind. Eng. Chem. Res.

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Despite the humongous volume of literature aiming to present the synthesis of innovative, more selective, stable, and active solid catalysts, the catalysts that come to be used at the industrial level, known as technical catalysts, are scarcely studied and poorly understood starting from the fact that most of the information on their manufacturing remains as an industrial secret. Therefore, many knowledge gaps and uncertainties in the techniques suitable to transform catalytic powders into technical catalysts lie ahead of those researchers who decide to engage in the development and study of applied catalysis. Therefore, this review seeks to provide guidance on the process for manufacturing technical catalysts from catalytic powders while also providing insight into the targeted properties of such materials. Specifically, this review examines the aspects related to the manufacture of technical catalysts spanning from the operations related to the mixture of their components to the thermal treatments to which the corresponding shaped bodies are submitted. Furthermore, we define and discuss the properties considered as key when evaluating the catalytic performance of the shaped materials.

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Section: Manufacture Of Technical Catalystsmentioning

confidence: 99%

Section: Manufacture Of Technical Catalystsmentioning

confidence: 99%

Section: Wet Mixturesmentioning

confidence: 99%

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Elements of the Manufacture and Properties of Technical Catalysts

García-Sánchez

Medrano

2023

Ind. Eng. Chem. Res.

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“…The association of this behavior to the platy nature of the particles of the porous solid agrees with what is known for mesoporous oxides such as -Al2O3 67 and parent aluminum containing mixed oxides. 68,69 Multiple inflection points at P/P0 > 0.7 are also commonly observed when the accumulation of extraneous materials over mesopore mouths takes place; e.g., carbonaceous residua over fluid catalytic cracking catalysts. 68 Herein, the catalysts NiMo/ASA095 and NiMo/ASAR065 were the ones that displayed such type of behavior.…”

Section: Assessment Of Porosity Surface Area and Fractal Dimensionmentioning

confidence: 99%

Systematic analysis of the nitrogen adsorption-desorption isotherms recorded for a series of microporous – mesoporous amorphous aluminosilicates using classical methods

Medrano

Celis

Giraldo

2022

Preprint

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Understanding the porous structure of microporous – mesoporous materials is very important for developing useful scientific concepts and principles in materials science, surface science, heterogeneous catalysis, adsorption and related technological applications. Amorphous aluminosilicates are of particular interest in this sense because it is relatively simple to design them with diverse porous structures comprising micro, meso, and even macropores. In this work, we took advantage of the latter and developed a systematic and in-depth analysis of the results of nitrogen physisorption tests at 77 K performed over a series of microporous – mesoporous amorphous aluminosilicates and of the characterization of their texture by classical models to estimate surface area and porosity. The strategy for the analysis consisted of making a thorough description of the features showed by the recorded nitrogen isotherms, first. As a result, a proposal for considering two new types of isotherms, types I(c) and IV(c), and five new types of hysteresis loops, H1(b), H2(c), H3(b), H3(c), and H4(b), in addition to the standard IUPAC classification. These new categories stemmed from the microporous – mesoporous nature of the materials and from the presence of strong network effects. The previous analysis helped interpreting and judging the results of the calculations made with classical methods to assess the texture of the materials; namely, their BET surface area, t-plot microporosity, BJH mesopore size distribution, and fractal dimension. The performed analyses allowed establishing that the relative percentage of microporosity of the materials can be correlated to the physisorption energy as described qualitatively by the CBET constant. Concerning mesopore size distributions, it was found that the BJH method remains to be very valuable for describing the porous structure of the materials particularly if the results obtained with both branches of the isotherms are considered. Finally, it was shown that the fractal dimension can complement the analysis of the porous structure of microporous – mesoporous materials if the latter are compared considering the features of their isotherms and of their hysteresis loops. Overall, the present study can thus be said to make two contributions: (i) it proposes a systematic methodology for analyzing both the raw data and the textural properties calculated by classical methods both derived from nitrogen physisorption experiments. (ii) It presents useful new insights on the texture of microporous – mesoporous materials.

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“…Acetone is a kind of oxygenated volatile organic compound (OVOC) with high reactivity that mainly comes from different industries such as pharmaceuticals, plastics, and printing, and which greatly harms human health and the environment. − Several of techniques (e.g., catalytic oxidation, condensation, adsorption, and biotechnology) have been applied to remove OVOCs. ,, Among these, catalytic oxidation is regarded as one of the most efficient and promising technologies in OVOC destruction owing to its advantages of low energy consumption and high efficiency. − It is necessary to develop economic and highly active catalysts that are crucial for catalytic oxidation technology. − …”

Section: Introductionmentioning

confidence: 99%

Tuning the Surface Mn/Al Ratio and Crystal Crystallinity of Mn–Al Oxides by Calcination Temperature for Excellent Acetone Low-Temperature Mineralization

Lǐ

Zheng

et al. 2023

ACS EST Eng.

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Here, Mn−Al oxides with the strengthened synergistic effect of Mn and Al species were fabricated by facilely adjusting the calcination temperature with the hydrolysis-driven redox-precipitation method. Results demonstrated that the surface Mn/Al ratio and KMn 8 O 16 phase can be effectively tamed under different calcination temperatures, which obviously alter the CO 2 selectivity, reaction rate, and stability of Mn−Al oxides for catalytic oxidation of acetone, among which the Mn 5 Al-350 catalyst exhibits the best catalytic performance (90% of acetone converted at 159 °C) with CO 2 selectivity higher than 99.5%, mainly owing to its higher surface Mn/Al ratio and weaker Mn−O bond with more Mn 3+ as compared to Mn 5 Al-250, Mn 5 Al-450, and Mn 5 Al-550. Although a decrease in the consumption rate of acetic acid in the presence of 3.0 vol % H 2 O leads to the slight reduction of acetone conversion and CO 2 yield, Mn 5 Al-350 still exhibits a superior catalytic stability. The reaction intermediates including acetaldehyde, ethanol, acetic acid, and formic acid species before total mineralization are determined by proton transfer reaction−mass spectrometry, theoretical calculations, and in situ DRIFTS. Theoretical calculations also reveal that the p-orbital interaction of C with a certain anisotropy leads to a weak catalytic effect in the process of acetic acid decomposition as the rate-limiting step.

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Effect of secondary additives on the properties of vanadium‑aluminum mixed oxide tableted catalysts used in the oxidation of propane

Cited by 9 publications

References 62 publications

Elements of the Manufacture and Properties of Technical Catalysts

Elements of the Manufacture and Properties of Technical Catalysts

Systematic analysis of the nitrogen adsorption-desorption isotherms recorded for a series of microporous – mesoporous amorphous aluminosilicates using classical methods

Tuning the Surface Mn/Al Ratio and Crystal Crystallinity of Mn–Al Oxides by Calcination Temperature for Excellent Acetone Low-Temperature Mineralization

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