Permeation behavior during the catalytic oxidation of CO in a Pt-loaded Y-type zeolite membrane
Permeation behavior during the catalytic oxidation of CO in a Pt-loaded Y-type zeolite membrane
复制标题
Pt负载Y型沸石膜催化氧化CO过程中的渗透行为
DOI：
10.1016/s0009-2509(03)00134-9
复制
发表时间：
2003
影响因子：
4.7
通讯作者：
K. Kusakabe
中科院分区：
文献类型：
--
作者：
Y. Hasegawa;K. Sotowa;K. Kusakabe
A Pt-loaded Y-type zeolite (Pt/NaY) membrane was prepared on the surface of a porous α-Al2O3support tube by hydrothermal synthesis and then ion-exchanged with platinum. The thickness of the zeolite layer and the amount of Pt loaded were ca. 12 μm and 1 wt % , respectively. The membrane was employed in the form of a cylindrical thin catalyst for the selective oxidation of CO in an H2-rich mixture. A mixture of CO, O2and H2was fed to the outer surface of the membrane, and CO was selectively oxidized during its permeation through the thin layer. The permeation fluxes for H2and CO were determined at 423–523 K . Permeation fluxes also calculated by means of a mathematical model using effective diffusion coefficients and reaction kinetics. The effective diffusion coefficients through the zeolite membrane were estimated from gas permeation test data, obtained at 423–523 K , and the oxidation rates of CO were determined over a particulate catalyst that had the same composition as the Pt/NaY membrane. As a result, the diffusion coefficients of O2, N2and CO were determined to be (0.7–1.0) ×10−7m2s−1at 423–523 K , and the activation energies for the rate constants for CO oxidation were 61–77 kJ mol−1. The predicted permeation fluxes of H2and CO using the mathematical model were in good agreement with the experimental data, when the oxidation selectivity of CO to H2was assumed to be 80% in the model calculation.
