Creat membership Creat membership
Sign in

Forgot password?

Confirm
  • Forgot password?
    Sign Up
  • Confirm
    Sign In
home > search

Now showing items 1 - 7 of 7

  • EXHAUST GAS PURIFYING CATALYST

    Disclosed is an exhaust gas purifying catalyst (1) containing a rare earth element, an alkaline earth element, zirconium and a noble metal. The atomic ratio of the alkaline earth element relative to the sum of the rare earth element and zirconium is not less than 10 at%. A part of the rare earth element and a part of zirconium form a complex oxide together with at least a part of the alkaline earth element, and this complex oxide and a part of the noble metal form a solid solution.
    Download Collect
  • CATALYST FOR EXHAUST GAS PURIFICATION

    Catalyst for exhaust gas purification (1) comprising a rare earth element, an alkaline earth element, zirconium and a noble metal, wherein the atomic ratio of alkaline earth element to the sum of rare earth element and zirconium is in the range of 0.1 to less than 10 at.%, and wherein a part of rare earth element and a part of zirconium together with at least a part of alkaline earth element form a composite oxide, this composite oxide together with a part of noble metal forming a solid solution.
    Download Collect
  • EXHAUST GAS PURIFICATION CATALYST

    Disclosed is an exhaust gas purification catalyst whose activity is hardly decreased even when it is used in an atmosphere of high temperature and high oxygen concentration. Specifically disclosed is an exhaust gas purification catalyst (1) containing a rare earth element, an alkaline earth element and a noble metal (13a). A part of the rare earth element and a part of the alkaline earth element form a complex oxide (12), and this complex oxide and a part of the noble metal form a solid solution.
    Download Collect
  • EXHAUST GAS CLARIFICATION CATALYST

    A catalyst for clarifying an exhaust gas containing a carrier and, carried thereon, an active component comprising a noble metal, wherein the carrier comprises a core portion comprising a cubic or tetragonal system stabilized zirconia based composite oxide containing at least one stabilizing element and, formed on the surface of the core portion, a surface layer portion comprising a heat-resistant zirconia based composite oxide, wherein the surface layer portion has a specific surface area greater than that of the core portion, and wherein a part of the noble metal forms a solid solution with the zirconia based composite oxide in the surface layer portion and the remainder of the noble metal is carried on the surface of the surface layer portion.
    Download Collect
  • Intelligent catalyst having the self-regenerative function of Pd, Rh and Pt for automotive emissions control

    Tanaka, Hirohisa   Uenishi, Mari   Taniguchi, Masashi   Tan, Isao   Narita, Keiichi   Kimura, Mareo   Kaneko, Kimiyoshi   Nishihata, Yasuo   Mizuki, Jun'ichiro  

    The self-regenerative function of precious metals in the intelligent catalyst is an epoch-making technology in the history of automotive catalysts after the 1970's. The mechanism of the self-regenerative function is studied by X-ray absorption fine-structure (XAFS) analyses. The function was realized through a cyclic movement of Pd between the outside (as Pd nanoparticles) and the inside (as Pd cations in the lattice) of the perovskite crystal in synchronization with the inherent fluctuations between reductive and oxidative (redox) atmospheres that occur in real automotive exhaust gases. As the result, the growth of Pd particles can be suppressed during the entire lifetime of the vehicle. Moreover, the speed of this function was measured at the time resolution of a 10 ms by in situ energy dispersive XAFS, and it is proved that the self-regenerative function occurs at an extremely high speed. Furthermore, the new perovskite catalysts which have the self-regenerative function of Rh and Pt, as well as Pd, are discussed here. This self-regenerative function provides a new and useful tool for designing the future catalyst technology. (C) 2006 Elsevier B.V. All rights reserved.
    Download Collect
  • CATALYST FOR PURIFYING EXHAUST GAS, PROCESS FOR PRODUCING THE SAME, AND METHOD FOR PURIFYING EXHAUST GAS

    An exhaust gas purifying catalyst comprising a carrier containing rutile titania, an NOx occluding material supported on a carrier comprising at least one member selected among alkali metal, alkaline earth metal and rare earth elements, and a noble metal supported on the carrier. Since the rutile TiO2 and the NOx occluding material form a finely divided composite oxide, a catalyst poison is liable to be decomposed even when the NOx occluding material is poisoned by sulfur, and thus this material can readily recover the capability of occluding NOx. Therefore it is possible to inhibit the sulfur poisoning of the NOx occluding material and to maintain a high NOx purifying rate even after high-temperature application.
    Download Collect
  • An Apparatus for X-ray Diffraction by Oscillation Technique

    Kimura, Mareo  

    Download Collect
1

Contact

If you have any feedback, Please follow the official account to submit feedback.

Turn on your phone and scan

Submit Feedback