Abstract: A resin composition includes 100 parts by weight of a vinyl group-containing polyphenylene ether resin, 5 parts by weight to 30 parts by weight of a maleimide resin, 5 parts by weight to 40 parts by weight of an active ester and 5 parts by weight to 40 parts by weight of a phosphate ester, wherein the resin composition does not include an epoxy resin. Moreover, also provided is an article made from the resin composition, including a prepreg, a resin film, a laminate or a printed circuit board, and the various properties can be improved including dissipation factor, dissipation factor after thermal aging, dissipation factor variation rate after thermal aging, copper foil peeling strength and alkali resistance.

Abstract: A method for preparing a molecular sieve SCR (selective catalytic reduction) catalyst and a prepared catalyst therethrough. In the method, several molecular sieves are mixed and modified by transition metal or rare-earth metal via ion exchange, then loaded Fe by equivalent-volume impregnation, and loaded Cu by one or more liquid ion exchange. This present invention, combined with several techniques, such as modification of stable molecular sieve by transition and rare-earth metal, Fe loading by equivalent-volume impregnation and Cu loading by one or more liquid ion exchange, and after through stable and effective modification and loading control, the obtained catalyst material is coated on a carrier substrate via size mixing and coating process to be prepared into an integral catalyst.

Abstract: The present disclosure provides a preparation method of a monometallic or bimetallic nanoparticle-supported catalyst. The synthesis of metal nanoparticles with different shapes, sizes, and atomic structures is affected by nucleation and growth rates. In the present disclosure, by changing a ratio of strong and weak reducing agents, a suitable double reducing agent is provided for metal nanoparticles with different reduction potentials, where the strong reducing agent is used for rapid nucleation and the weak reducing agent is used for the growth of metal nanoparticles. Accordingly, modulation and control of the nucleation and growth rates can be realized during the synthesis of nanoparticles.

Abstract: A low-temperature NOx storage catalyst for automobile exhaust purification and a preparation method thereof. Loading a noble metal salt solution on molecular sieve by equal volume impregnation method, wherein the noble metal salt solution comprises palladium nitrate and platinum nitrate, and the molecular sieve comprises SSZ, SAPO and BETA, then drying at 60-120° C. for 2-6 h, roasting at 500-550° C. in air for 2-5 h, and further roasting at 750-850° C. in air for 2-5 h, and then mixing with aluminum sol, ball milling and pulping, and then coating the slurry on a carrier, wherein the loading on the coating is 100-250 g/L and the noble metal content is 10-150 g/ft3, drying at 60-120° C. for 2-6 h, then roasting at 500-550° C. in air for 2-5 h, and further continuing roasting at 750-850° C. in air for 2-5 h, to obtain the catalyst.

Abstract: An ozone purification catalyst, and a preparation method therefor and an application thereof are provided. The catalyst coating uses macroporous, high specific surface and CeO2 and/or La2O3 modified Al2O3 as the carrier material, and Mn and/or Pd as the active component. The preparation method is to prepare the Al2O3-based material by a sol-gel method, and then to load the active components on the carrier material, and to dry, calcinate and solidify to obtain the ozone purification catalyst. The catalysts as prepared shows a fast and efficient purification of ozone. The complete conversion temperature covers a wide range of temperature. The catalyst has excellent texture performance, high specific surface area and large pore volume, which is beneficial to ozone purification when the car is running at high speed. The particle sizes and colors of the catalyst can be modified according to various requirements.

Abstract: A low-temperature NOx storage catalyst for automobile exhaust purification and a preparation method thereof. Loading a noble metal salt solution on molecular sieve by equal volume impregnation method, wherein the noble metal salt solution comprises palladium nitrate and platinum nitrate, and the molecular sieve comprises SSZ, SAPO and BETA, then drying at 60-120° C. for 2-6 h, roasting at 500-550° C. in air for 2-5 h, and further roasting at 750-850° C. in air for 2-5 h, and then mixing with aluminum sol, ball milling and pulping, and then coating the slurry on a carrier, wherein the loading on the coating is 100-250 g/L and the noble metal content is 10-150 g/ft3, drying at 60-120° C. for 2-6 h, then roasting at 500-550° C. in air for 2-5 h, and further continuing roasting at 750-850° C. in air for 2-5 h, to obtain the catalyst.

Abstract: An AFI-CHA hybrid crystal molecular sieve and an NH3-SCR catalyst using the AFI-CHA hybrid crystal molecular sieve as a carrier, and preparation methods thereof are disclosed. The AFI-CHA hybrid crystal molecular sieve includes an AFI-type SAPO-5 molecular sieve and a CHA-type SAPO-34 molecular sieve, with hybrid crystal grains of AFI and CHA. The hybrid crystal molecular sieve is synthesized by a hydrothermal synthesis method and can be obtained by changing the structure directing agent, the heating rate and the calcinating temperature in the preparation process. Further, copper is loaded on the basis of the hybrid crystal molecular sieve to prepare copper-based NH3-SCR catalyst and corresponding monolithic catalyst. The catalytic activity and hydrothermal stability of the catalyst are significantly improved by the hybrid crystal molecular sieve.

Abstract: An AFI-CHA hybrid crystal molecular sieve and an NH3—SCR catalyst using the AFI-CHA hybrid crystal molecular sieve as a carrier, and preparation methods thereof are disclosed. The AFI-CHA hybrid crystal molecular sieve includes an AFI-type SAPO-5 molecular sieve and a CHA-type SAPO-34 molecular sieve, with hybrid crystal grains of AFI and CHA. The hybrid crystal molecular sieve is synthesized by a hydrothermal synthesis method and can be obtained by changing the structure directing agent, the heating rate and the calcinating temperature in the preparation process. Further, copper is loaded on the basis of the hybrid crystal molecular sieve to prepare copper-based NH3—SCR catalyst and corresponding monolithic catalyst. The catalytic activity and hydrothermal stability of the catalyst are significantly improved by the hybrid crystal molecular sieve.

Abstract: A method for preparing a molecular sieve SCR (selective catalytic reduction) catalyst and a prepared catalyst therethrough. In the method, several molecular sieves are mixed and modified by transition metal or rare-earth metal via ion exchange, then loaded Fe by equivalent-volume impregnation, and loaded Cu by one or more liquid ion exchange. This present invention, combined with several techniques, such as modification of stable molecular sieve by transition and rare-earth metal, Fe loading by equivalent-volume impregnation and Cu loading by one or more liquid ion exchange, and after through stable and effective modification and loading control, the obtained catalyst material is coated on a carrier substrate via size mixing and coating process to be prepared into an integral catalyst.

Abstract: The present invention discloses a method for preparing a catalyst, comprising the following steps: (1) taking a noble metal salt solution A, adding a modified alumina support material, stirring until uniform and standing; (2) drying the material obtained in step (1) in a vacuum, and calcining at 500° C.-600° C. for 1-4 hours to obtain a powder material containing the noble metal; (3) mixing the noble metal powder material, an adhesive and other components to be added, and ball-milling to obtain a uniform slurry; (4) preparing a noble metal solution B and adjusting pH to 0.5-1; and (5) mixing the slurry of the step (3) with the noble metal solution B, coating the mixture on a support, drying, and calcining at 500° C.-600° C. for 1-2 hours to obtain the target product. The method for preparing the catalyst of the present invention is simple, the conditions of the preparation process are easy to control and the preparation method has strong practicality.

Abstract: Provided are a low-temperature SCR catalyst for denitrating diesel vehicle exhaust, and preparation method thereof. The catalyst uses a molecular sieve as a carrier, and uses metallic elements such as copper and iron as active components. The catalyst preparation method comprises: preprocessing the molecular sieve; conducting multiple equal-volume impreparations; after impreparation, drying to dehydrate, and calcining; and finally pulping and coating to prepare the catalyst. The catalyst employs base metals such as copper and iron instead of precious metals as active components, thus reducing costs, being harmless to humans, and being environmentally friendly.

Abstract: The present invention discloses a method for preparing a catalyst, comprising the following steps: (1) taking a noble metal salt solution A, adding a modified alumina support material, stirring until uniform and standing; (2) drying the material obtained in step (1) in a vacuum, and calcining at 500° C.-600° C. for 1-4 hours to obtain a powder material containing the noble metal; (3) mixing the noble metal powder material, an adhesive and other components to be added, and ball-milling to obtain a uniform slurry; (4) preparing a noble metal solution B and adjusting pH to 0.5-1; and (5) mixing the slurry of the step (3) with the noble metal solution B, coating the mixture on a support, drying, and calcining at 500° C.-600° C. for 1-2 hours to obtain the target product. The method for preparing the catalyst of the present invention is simple, the conditions of the preparation process are easy to control and the preparation method has strong practicality.

Abstract: Provided are a low-temperature SCR catalyst for denitrating diesel vehicle exhaust, and preparation method thereof. The catalyst uses a molecular sieve as a carrier, and uses metallic elements such as copper and iron as active components. The catalyst preparation method comprises: preprocessing the molecular sieve; conducting multiple equal-volume impreparations; after impreparation, drying to dehydrate, and calcining; and finally pulping and coating to prepare the catalyst. The catalyst employs base metals such as copper and iron instead of precious metals as active components, thus reducing costs, being harmless to humans, and being environmentally friendly.

Abstract: A piezoelectric anion generator controlled by an integrated circuit IC, which includes an oscillation circuit, a frequency following-up circuit, an power amplification circuit, a step-up circuit, a voltage-doubling circuit, an ion discharging pin, a negative feedback voltage-stabilizing circuit and a bleeder circuit. Due to using the integrated circuit IC controlling circuit, it can provide the AC exciting voltage at the certain frequency to the piezoelectric ceramic transformer and has the functions of regulating the exciting voltage and the frequency following up. The piezoelectric ceramic transformer is used as the main AC step-up element to realize the AC high voltage output. After the voltage-doubling commutation the DC high voltage can be obtained, and the anion-discharging pin connected to it generates the high voltage electrical field, and then the gas is ionized to give out a lot of anions.

Abstract: A non-symmetric drive type piezoelectric ceramic transformer has been disclosed in the present invention. The non-symmetric drive type piezoelectric ceramic transformer has a rectangular piezoelectric ceramic conductor. Along the length of rectangular piezoelectric ceramic conductor, it is divided into three zones: the first zone is the oscillation node accommodate zone of the length adjusting, that the change of length can adjust the resonance frequency and the oscillation node of the piezoelectric ceramic transformer; the second zone is input drive zone, which upper of lower surface have been coated with electrodes and polarized in the direction of the thickness; the third zone is the output generation zone, which output terminals are coated with electrodes and polarized in the direction of the length of the conductor.

Abstract: A non-symmetric drive type piezoelectric ceramic transformer has been disclosed in the present invention. The non-symmetric drive type piezoelectric ceramic transformer has a rectangular piezoelectric ceramic conductor. Along the length of rectangular piezoelectric ceramic conductor, it is divided into three zones: the first zone is the oscillation node accommodate zone of the length adjusting, that the change of length can adjust the resonance frequency and the oscillation node of the piezoelectric ceramic transformer; the second zone is input drive zone, which upper of lower surface have been coated with electrodes and polarized in the direction of the thickness; the third zone is the output generation zone, which output terminals are coated with electrodes and polarized in the direction of the length of the conductor.

Abstract: The present invention discloses a piezoelectric anion generator controlled by an integrated circuit IC, which includes an oscillation circuit, a frequency following-up circuit, an power amplification circuit, a step-up circuit, a voltage-doubling circuit, an ion discharging pin, a negative feedback voltage-stabilizing circuit and a bleeder circuit. Due to using the integrated circuit IC controlling circuit, it can provide the AC exciting voltage at the certain frequency to the piezoelectric ceramic transformer and has the functions of regulating the exciting voltage and the frequency following up. The piezoelectric ceramic transformer is used as the main AC step-up element to realize the AC high voltage output. After the voltage-doubling commutation the DC high voltage can be obtained, and the anion-discharging pin connected to it generates the high voltage electrical field, and then the gas is ionized to give out a lot of anions.