Outstanding Formaldehyde Abatement Performance and Preferable Resistance to SO2 and H2O over CrOx-CeOx Facilitated Hierarchical Porous Biochars Catalysts
Huiyu Xiong, Xiaoxin Feng, Lei Gao, Liping Xiang, Dong Xie, Caiting Li, Weizhi Peng, Zhixiu Huang, Xuan Liu
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引用次数: 0
Abstract
A suite of CrCe oxides facilitated hierarchical porous biochars from walnut husks and rice straws (XCryCe1-y/WSAC) were readily synthesized for formaldehyde (HCHO) abatement. BET, XRD, XPS, SEM, H2-TPR, TG-DTG, and in situ DRIFTS were adopted to disclose their physicochemical properties and the elimination mechanism of HCHO. 18%Cr0.5Ce0.5/WSAC exhibited splendid HCHO abatement efficiency (99.2%) at 280 °C. The effects of O2, SO2, H2O for HCHO abatement over 18%Cr0.5Ce0.5/WSAC were trialed, and the strangulation influences of SO2 counteracted the furtherance effect of O2 to some extent, which was relieved by the facilitation of H2O. CrOx-CeOx co-facilitated WSAC presented better performance than Cr or Ce oxide separately facilitated WSACs, which was associated with the redox cycle of Cr6+ + Ce3+ ↔ Cr3+ + Ce4+, resulting in higher redox capability, better dispersion of active ingredient, more oxygen vacancies and superior active oxygen mobility. Furthermore, the hierarchical porous support accelerated the diffusion and mass transfer of reactants and intermediates. Noteworthily, the effects of CrOx-CeOx and the hierarchical porous structure of the support on the tolerance to SO2 and H2O were deeply and systematically investigated. Ultimately, 18%Cr0.5Ce0.5/WSAC emerged desirable prospects in practical applications thanks to splendid catalytic performance and satisfactory resistance to SO2 and H2O.
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Water, Air, & Soil Pollution is an international, interdisciplinary journal on all aspects of pollution and solutions to pollution in the biosphere. This includes chemical, physical and biological processes affecting flora, fauna, water, air and soil in relation to environmental pollution. Because of its scope, the subject areas are diverse and include all aspects of pollution sources, transport, deposition, accumulation, acid precipitation, atmospheric pollution, metals, aquatic pollution including marine pollution and ground water, waste water, pesticides, soil pollution, sewage, sediment pollution, forestry pollution, effects of pollutants on humans, vegetation, fish, aquatic species, micro-organisms, and animals, environmental and molecular toxicology applied to pollution research, biosensors, global and climate change, ecological implications of pollution and pollution models. Water, Air, & Soil Pollution also publishes manuscripts on novel methods used in the study of environmental pollutants, environmental toxicology, environmental biology, novel environmental engineering related to pollution, biodiversity as influenced by pollution, novel environmental biotechnology as applied to pollution (e.g. bioremediation), environmental modelling and biorestoration of polluted environments.
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Water, Air, & Soil Pollution publishes research papers; review articles; mini-reviews; and book reviews.
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