68 The Testing of Heterogeneous Catalysts

Dowden, D. A.; Bridger, G. W.

doi:10.1016/s0360-0564(08)60219-9

Cited by 4 publications

(5 citation statements)

References 20 publications

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“…The average particle size of both the iron and alumina catalysts tested was chosen to be 20/30 mesh. This gave a particle to reactor internal diameter ratio of 1:9, which was slightly lower than the minimum recommended by Dowden and Bridger (1957) in order to ensure plug flow through the catalyst bed. For the experimental conditions used in this study, theoretical calculations as well as experimental results indicated that internal and external film diffusion limitations were negligible .…”

Section: Methodsmentioning

confidence: 91%

Dual Bed Catalyst for Simultaneous Reduction of Sulfur Dioxide and Nitric Oxide with Carbon Monoxide

Sood¹,

Kittrell²

1974

Product R&D

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Section: Methodsmentioning

confidence: 91%

Dual Bed Catalyst for Simultaneous Reduction of Sulfur Dioxide and Nitric Oxide with Carbon Monoxide

Sood¹,

Kittrell²

1974

Product R&D

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“…Many of the catalysts studied are metal oxides, and so initially it is interesting to focus on some studies that have adopted a catalyst design approach. One such pioneering study by Dowden et al proposed a hypothetical virtual mechanism . Analyzing the thermodynamics of the target reaction and side reactions, it was concluded that the key catalyst functions required were dehydrogenation and oxygen insertion.…”

Section: High Temperature Gas Phase Selective Methane Oxidationmentioning

confidence: 99%

“…It was concluded that suitable catalysts should be formulated from The virtual mechanism proposed was one of the first to develop a conceptual approach to selective methane oxidation, but it did not contain any significant experimental validation. However, the thinking obviously influenced a related patent by Dowden and Walker, who developed a series of two component oxide catalysts based on their mechanistic principles . Results were reported for MoO 3 /ZnO, MoO 3 /Fe 2 O 3 , MoO 3 /VO 2 , and MoO 3 /UO 2 supported on 1 / 3 Al 2 O 3 /SiO 2 with a low surface area of ca.…”

Section: High Temperature Gas Phase Selective Methane Oxidationmentioning

confidence: 99%

“…One such pioneering study by Dowden et al proposed a hypothetical virtual mechanism. 86 Analyzing the thermodynamics of the target reaction and side reactions, it was concluded that the key catalyst functions required were dehydrogenation and oxygen insertion. Oxidation reactions all led preferentially to formation of undesirable carbon oxides.…”

Section: Metal Oxide Catalystsmentioning

confidence: 99%

“…However, the thinking obviously influenced a related patent by Dowden and Walker, 87 who developed a series of two component oxide catalysts based on their mechanistic principles. 86 Results were reported for MoO 3 /ZnO, MoO 3 / Fe 2 O 3 , MoO 3 /VO 2 , and MoO 3 /UO 2 supported on 1 / 3 Al 2 O 3 / SiO 2 with a low surface area of ca. 0.1 m 2 g −1 and a loading of 5% active oxide.…”

Section: Metal Oxide Catalystsmentioning

confidence: 99%

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Methane Oxidation to Methanol

et al. 2022

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The direct transformation of methane to methanol remains a significant challenge for operation at a larger scale. Central to this challenge is the low reactivity of methane at conditions that can facilitate product recovery. This review discusses the issue through examination of several promising routes to methanol and an evaluation of performance targets that are required to develop the process at scale. We explore the methods currently used, the emergence of active heterogeneous catalysts and their design and reaction mechanisms and provide a critical perspective on future operation. Initial experiments are discussed where identification of gas phase radical chemistry limited further development by this approach. Subsequently, a new class of catalytic materials based on natural systems such as iron or copper containing zeolites were explored at milder conditions. The key issues of these technologies are low methane conversion and often significant overoxidation of products. Despite this, interest remains high in this reaction and the wider appeal of an effective route to key products from C–H activation, particularly with the need to transition to net carbon zero with new routes from renewable methane sources is exciting.

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