Abstract: The present application discloses a catalyst, the catalyst contains a molecular sieve, there is at least one-dimension 8-membered ring channel in the molecular sieve structure, the diameter of a diffusible substance in the direction of the 8-membered ring channel is no less than 2.0 ?, the diameter of a substance that can be accommodated in the molecular sieve structure is no more than 6 ?; the catalyst is used for a methanol and/or dimethyl ether to propylene reaction, comprising contacting methanol and/or dimethyl ether with a methanol-to-propylene catalyst to obtain propylene.

Abstract: A catalyst, which comprises molecular sieves; a molecular sieve structure is at least provided with a one-dimension eight-membered annular small hole channel, wherein the diameter of a substance that may diffuse in the direction of the eight-membered annular channel is no less than 2.0 ?, and the diameter of a substance that may be accommodated in the molecular sieves is no more than 6 ?. The catalyst is used for a methanol- and/or dimethyl ether-to-propylene reaction, comprising causing methanol and/or dimethyl ether to make contact with a methanol-to-propylene catalyst to obtain propylene.

Abstract: A preparation method for a metal-modified SAPO molecular sieve is disclosed, characterized in adding a raw powder of the SAPO molecular sieve to a solution containing metal ions for performing ion exchange, and then washing and drying the obtained solid after ion exchange, so as to obtain the metal-modified SAPO molecular sieve. The metal-modified SAPO molecular sieve prepared has a relatively high degree of crystallinity, and the metal elements occupy the ionic positions in the channels and/or cages of the SAPO molecular sieve, and the metal-modified SAPO molecular sieve shows excellent catalytic performance in the catalytic reaction.

Abstract: A preparation method for a metal-modified SAPO molecular sieve is disclosed, characterized in adding a raw powder of the SAPO molecular sieve to a solution containing metal ions for performing ion exchange, and then washing and drying the obtained solid after ion exchange, so as to obtain the metal-modified SAPO molecular sieve. The metal-modified SAPO molecular sieve prepared has a relatively high degree of crystallinity, and the metal elements occupy the ionic positions in the channels and/or cages of the SAPO molecular sieve, and the metal-modified SAPO molecular sieve shows excellent catalytic performance in the catalytic reaction.

Abstract: The present invention provides blue-green silicate luminescent materials, which are rare earth activated alkaline-earth metals silicates having a formula of Ba1-bMbSi2O(5-a/2)Da:Eux, Lny, wherein M is one or two elements selected from the group consisting of Mg, Ca and Sr; D is one or two ions selected from the group consisting of Cl? and F?; Ln is an ion selected from Ce, Er, Pr or Mn; a, b, x, and y are molar coefficients and within following ranges: 0?a<2, 0?b<0.5, 0<x<1, 0?y<0.5. the blue-green silicate luminescent material can be excited by UV, violet and blue lights of 200 nm-450 nm and emit blue-green light with a peak wavelength of around 490-510 nm. The luminescent materials can be used not only in color-rendering index adjustment of tricolor lamps and white-light LED, but also in decoration and lighting with special colors.