{'fraction_non_alphanumeric': 0.01884057971014493, 'fraction_numerical': 0.010144927536231883, 'mean_word_length': 5.836633663366337, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Active and Passive Methods for Indoor Formaldehyde Elimination

Manganese oxide-based catalysts for active formaldehyde abatement have been synthesized in aqueous solution and characterized using X-ray Diffraction spectroscopy, porosimetry, scanning electron microscopy, and inductively coupled plasma mass spectroscopy techniques. Initial results show good material properties such as high surface area and low particle size. Room temperature catalysis of formaldehyde was studied by incorporating a supported catalyst in a simple flow system with formaldehyde upstream concentrations ranging from 30 ppb to 150 ppb. Additionally, two different face velocities (0.11 and 31.4 m s -1 ) were also studied to evaluate the performance of the catalyst under different experimental conditions. Results show consistent formaldehyde catalytic oxidation efficiency greater than 80% in all cases. Manganese oxide synthesis and deployment costs are expected to be relatively low; thus, this catalyst is promising for maintaining low indoor formaldehyde levels without high outdoor air ventilation rates. In related research we evaluated passive formaldehyde air cleaning, using a commercially-available zeolite-containing ceiling tile which reportedly can reduce formaldehyde levels in indoor air. However, there was no clear evidence of formaldehyde elimination catalyzed by that material.