12.
    发明专利
    未知

    公开(公告)号:BR7706927A

    公开(公告)日:1978-06-27

    申请号:BR7706927

    申请日:1977-10-17

    Inventor: SHAW W WHITE J

    Abstract: Coated catalysts having an inert support material with an outer surface and a coating of active catalyst containing molybdenum, phosphorus, arsenic, copper and oxygen have been found to be especially effective catalysts for the production of unsaturated acids from the corresponding unsaturated aldehydes, for example, methacrolein is oxidized to methacrylic acid using these catalysts. The catalysts give a very low exotherm, very high single pass yields of the desired acid and reduce the undesirable byproducts.

    16.
    发明专利
    未知

    公开(公告)号:BR7605401A

    公开(公告)日:1977-08-16

    申请号:BR7605401

    申请日:1976-08-18

    Inventor: WHITE J REGE J

    Abstract: Catalysts containing the oxides of molybdenum and phosphorus promoted with rubidium and at least one element selected from the group consisting of As, Cd, In, Sn, Tl, K, Ca, V, U, Ce, W, Ni, Zr, Ba, Fe, Rh, Mn, Re, Ru, Co, and Cu have been found to be especially desirable in the vapor phase oxidation of acrolein and methacrolein with molecular oxygen to yield acrylic acid and methacrylic acid respectively. The reaction of methacrolein gives an especially pure product in high yields and selectivities of methacrylic acid.

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