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US 2026/0175203 A1Published application
Catalyst and method for manufacturing the same, and method for manufacturing unsaturated nitrile or alkene
AssigneeAsahi Kasei Kabushiki Kaisha
InventorsNatsume KOIKE, Yu ONODERA
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Abstract
A catalyst including a metal oxide containing molybdenum and vanadium, wherein the catalyst includes a P1 crystal and a P2 crystal, and a ratio of a crystal lattice constant of the P2 crystal in the C-axis direction to a crystal lattice constant of the P1 crystal in the C-axis direction is 1.0030 to 1.0100.
Claims11
A catalyst comprising a metal oxide containing molybdenum and vanadium, wherein
- the catalyst comprises a P1 crystal and a P2 crystal, and
- a ratio of a crystal lattice constant of the P2 crystal in the C-axis direction to a crystal lattice constant of the P1 crystal in the C-axis direction is 1.0030 to 1.0100.
A method for manufacturing a catalyst, comprising
- a step of preparing a slurry containing molybdenum, vanadium, and a first wet silica,
- a step of spray drying the slurry to obtain particles, and
- a step of calcining the particles to obtain a catalyst, wherein
- at least one of (1) and (2) below is satisfied:
- (1) the method further comprises mixing a second wet silica with the slurry when pH of the slurry is 3 to 8;
- and
- (2) in a solid-state 29Si—NMR spectrum of the first wet silica, a ratio of the total area of Q2 signal and Q3 signal to the total area of Q2 signal, Q3 signal, and Q4 signal is 12 to 35%.
4 more elements
Dependencies are inferred from the claim text.