Effect of Ultrasonic Treatment on the Physicochemical Properties of Cr-Mo-O Catalysts for Methanol Oxidation

Popov, T.; Klissurski, D.; Ivanov, K.; Pesheva, J.

doi:10.1016/s0167-2991(08)65408-7

Cited by 9 publications

(2 citation statements)

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“…The catalytic properties of Cr-Mo oxide catalysts with Mo/Cr ratios of 0.4-6.5 were investigated by Popov et al [115,116] who found maximum activity and selectivity at Mo/Cr = 1.6-1.9, similarly to what they observed for FeMo catalysts. With 6.5 vol.% MeOH in the feed at 300 • C, they achieved 96.9% and 96.2% selectivity at 85.4% and 87% conversion for the Mo/Cr = 1.6 and 1.9 catalysts, respectively, and >99.5% selectivity at <21.2% conversion.…”

Section: Mo Containing Catalystsmentioning

confidence: 86%

A Review and Experimental Revisit of Alternative Catalysts for Selective Oxidation of Methanol to Formaldehyde

et al. 2021

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The selective oxidation of methanol to formaldehyde is a growing million-dollar industry, and has been commercial for close to a century. The Formox process, which is the largest production process today, utilizes an iron molybdate catalyst, which is highly selective, but has a short lifetime of 6 months due to volatilization of the active molybdenum oxide. Improvements of the process’s lifetime is, thus, desirable. This paper provides an overview of the efforts reported in the scientific literature to find alternative catalysts for the Formox process and critically assess these alternatives for their industrial potential. The catalysts can be grouped into three main categories: Mo containing, V containing, and those not containing Mo or V. Furthermore, selected interesting catalysts were synthesized, tested for their performance in the title reaction, and the results critically compared with previously published results. Lastly, an outlook on the progress for finding new catalytic materials is provided as well as suggestions for the future focus of Formox catalyst research.

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Section: Mo Containing Catalystsmentioning

confidence: 86%

A Review and Experimental Revisit of Alternative Catalysts for Selective Oxidation of Methanol to Formaldehyde

et al. 2021

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“…[26] Though higher stability was found for stoichiometric molybdates, an excess of MoO 3 was needed to obtain selectivity and activity similar to what was reported by the Popov group. [27][28][29][30] However, these catalysts deactivated quickly due to evaporation of the excess MoO 3 .…”

Section: Introductionmentioning

confidence: 99%

Highly Stable Apatite Supported Molybdenum Oxide Catalysts for Selective Oxidation of Methanol to Formaldehyde: Structure, Activity and Stability

et al. 2021

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Molybdenum oxide (5 to 20 wt.%) supported on calcium or strontium hydroxyapatite were investigated as catalysts for selective oxidation of methanol to formaldehyde. These catalysts were both active and selective, with a maximum yield achieved at 95 % conversion and 96 % selectivity. The main byproducts were CO (3.2 %) and dimethyl ether (DME, 0.7 %). The catalytic performance of the catalysts was measured for up to 600 h at 350 °C. Compared to an industrial iron molybdate catalyst, the hydroxyapatite based catalysts deactivated slower.The active species were found to be a surface layer of MoO x on the hydroxyapatite support, while excess molybdenum formed crystalline (Ca/Sr)MoO 4 , acting as a reservoir replenishing surface MoO x lost by volatilization with methanol. The excess molybdenum in the form of (Ca/Sr)MoO 4 was found to volatilize significantly slower than the excess MoO 3 in iron molybdate catalysts. The combination of high activity and selectivity with low rate of Mo volatilization makes this class of catalysts interesting for industrial production of formaldehyde.

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Sonocatalysis

Suslick

Skrabalak

2008

Handbook of Heterogeneous Catalysis

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The sections in this article are Introduction and the Origins of Sonochemistry Effects of Ultrasound on Heterogeneous Catalysts Metal Powders Modification of Bulk Metals Amorphous and Nanostructured Metal Catalysts Metal Oxides as Catalysts Metal Carbides and Sulfides Catalyst Supports: Sonogels and Zeolites Supported Catalysts Polymerization Catalysts Conclusion

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Effect of Ultrasonic Treatment on the Physicochemical Properties of Cr-Mo-O Catalysts for Methanol Oxidation

Cited by 9 publications

References 1 publication

A Review and Experimental Revisit of Alternative Catalysts for Selective Oxidation of Methanol to Formaldehyde

A Review and Experimental Revisit of Alternative Catalysts for Selective Oxidation of Methanol to Formaldehyde

Highly Stable Apatite Supported Molybdenum Oxide Catalysts for Selective Oxidation of Methanol to Formaldehyde: Structure, Activity and Stability

Sonocatalysis

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