Selective Oxidation and Ammoxidation of Propylene by Heterogeneous Catalysis

Grasselli, Robert K.; Burrington, James D.

doi:10.1016/s0360-0564(08)60327-2

Cited by 448 publications

(174 citation statements)

References 25 publications

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“…Since the development of bismuth molybdate catalysts for the oxidation and ammoxidation of propylene to acrolein or acrylonitrile by Sohio in 1959 [1,2], these mixed oxides have received strong attention and their catalytic properties have been studied in considerable detail [3][4][5][6][7][8][9][10][11][12]. Addition of further elements such as iron, cobalt or vanadium increased the acrolein and acrylonitrile yields and stabilized the catalyst during the reaction.…”

Section: Introductionmentioning

confidence: 99%

Bismuth Molybdate Catalysts Prepared by Mild Hydrothermal Synthesis: Influence of pH on the Selective Oxidation of Propylene

et al. 2015

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A series of bismuth molybdate catalysts with relatively high surface area was prepared via mild hydrothermal synthesis. Variation of the pH value and Bi/Mo ratio during the synthesis allowed tuning of the crystalline Bi-Mo oxide phases, as determined by X-ray diffraction (XRD) and Raman spectroscopy. The pH value during synthesis had a strong influence on the catalytic performance. Synthesis using a Bi/Mo ratio of 1/1 at pH ≥ 6 resulted in γ-Bi2MoO6, which exhibited a better catalytic performance than phase mixtures obtained at lower pH values. However, a significantly lower catalytic activity was observed at pH = 9 due to the low specific surface area. γ-Bi2MoO6 synthesized with Bi/Mo = 1/1 at pH = 6 and 7 exhibited relatively high surface areas and the best catalytic performance. All OPEN ACCESSCatalysts 2015, 5 1555 samples prepared with Bi/Mo = 1/1, except samples synthesized at pH = 1 and 9, showed better catalytic performance than samples synthesized with Bi/Mo = 2/3 at pH = 4 and 9 and γ-Bi2MoO6 synthesized by co-precipitation at pH = 7. At temperatures above 440 °C, the catalytic activity of the hydrothermally synthesized bismuth molybdates started to decrease due to sintering and loss of surface area. These results support that a combination of the required bismuth molybdate phase and a high specific surface area is crucial for a good performance in the selective oxidation of propylene.

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Section: Introductionmentioning

confidence: 99%

Bismuth Molybdate Catalysts Prepared by Mild Hydrothermal Synthesis: Influence of pH on the Selective Oxidation of Propylene

et al. 2015

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“…[1][2][3] Silver is commonly employed as the catalyst and its performance depends on both particle size and crystal facets exposed. [4][5][6] By controlled synthesis in solution, colloidal silver nanocubes and nanowires with mostly (100) exposed facets have been obtained which has shown excellent selectivity.…”

Section: Introductionmentioning

confidence: 99%

A Deep Investigation of the Thermal Decomposition Process of Supported Silver Catalysts

Jiang¹,

Xu²,

Li³

et al. 2014

Bulletin of the Korean Chemical Society

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A deep understanding of the metallic silver catalysts formation process on oxide support and the formation mechanism is of great scientific and practical meaning for exploring better catalyst preparing procedures. Herein the thermal decomposition process of supported silver catalyst with silver oxalate as the silver precursor in the presence of ethylenediamine and ethanolamine is carefully investigated by employing a variety of characterization techniques including thermal analysis, in situ diffuse reflectance infrared Fourier transform spectroscopy, scanning electron microscopy, and X-ray diffraction. The formation mechanism of supported silver particles was revealed. Results showed that formation of metallic silver begins at about 100 o C and activation process is essentially complete below 145 o C. Formation of silver was accompanied by decomposition of oxalate group and removal of organic amines. Catalytic performance tests using the epoxidation of ethylene as a probe reaction showed that rapid activation (for 5 minutes) at a relatively low temperature (170 o C) afforded materials with optimum catalytic performance, since higher activation temperatures and/or longer activation times resulted in sintering of the silver particles.

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“…Bismuth molybdates, Bi203-nMoO3, have been the subject of intense interest for several decades because they are very selective catalysts for alkene oxidation (Grasselli & Burrington, 1981). As these processes are industrially important, many kinetic and structural studies aimed at elucidating the mechanism of olefin oxidation have been performed.…”

mentioning

confidence: 99%