Preparation of alveolate hydrophobic catalyst for tritium waste gas treatment

Abstract

To prepare a catalyst for the detritiation of waste gases at high flow rates, a heat-resistant hydrophobic zeolitic molecular sieve coating was synthesized on the surface of alveolate cordierite by hydrothermal processing. The alveolate hydrophobic catalyst prepared from the support was essentially waterproof and not easily poisoned by moisture. At room temperature, the conversion of low concentrations of H2 in humid air over the catalyst was higher than 95% at different space velocities (0–16,000h−1) and different relative humidities. The reaction rate constant of the oxidation of tritium over alveolate hydrophobic catalyst is 0.182s−1 at 293.3K–293.7K and 59%–60% RH, it is much higher than the catalyst of reference honeycomb catalyst.