(106g) Synthesis, Characterization of Vanadia/Titania-Based Catalysts and Their Performance in Ammonia Remediation

Authors: 
Chen, H., The Hong Kong University of Science and Technology
Han, W., The Hong Kong University of Science and Technology
Avila, P., CSIC, Spain
Bañares, M. A., The Institute of Catalysis and Petrochemistry
Yeung, K. L., The Hong Kong University of Science and Technology

Synthesis, Characterization of Vanadia/titania-based Catalysts and their Performance in Ammonia Remediation

Hao Chen1,3, Raquel Portela4,Wei Han1, Pedro Avila4,Miguel A. Bañares4, King Lun Yeung1,2*

1Department of Chemical and Biomolecular Engineering, 2Division of Environment, 3Nano Science and Technology Program, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, P.R. China

4 Instituto de Catalisis y Petroleoquimica, CSIC, Marie Curie 2, 28049, Madrid Spain

*Corresponding author: kekyeung@ust.hk

Division: 20 Catalysis and Reaction Engineering Division

Subdivision: 20037 Applied Environmental Catalysis

Format: Oral Presentation

Abstract:

Ammonia is an important source of malodors that are becoming more prevalent in urban cities. Indeed, malodor is a rampant environmental pollution problem that is prominent in the places that transport, process and store organic and biological wastes (e.g., drainage and sewers, waste and recycling stations, wastewater and solid waste treatment facilities, incineration plants and landfills). Discomfort breathing, eye and throat irritations and headaches are common complaints related to malodor. Long-term exposure is known to cause olfactory dysfunction, sleep and eating disorders and even behavioral problems in people. Vanadium oxides are known to catalyze many partial oxidation reactions including the partial oxidations of alkanes, olefins and alcohols, and more recently, the selective oxidation of NH3 to N2. The versatility of the vanadium oxide catalyst is attributed to the facile transition among the various active vanadium oxide species and the formation of oxygen vacancies that facilitates the transport and storage of reactive oxygen species. In this study, a series of NH3 oxidation catalysts were prepared from a suspension of UV100 and ammonium vanadate meta in DDI water via rotary evaporation to obtain well dispersed vanadia-titania powder. These obtained catalysts were tested via the reactions with a wide concentration range of NH3 from 50 ppm to 4370 ppm in air. The results show near 100% conversion for low concentrations of NH3 and still high reaction rate with moderate conversion for high concentrations of NH3. The catalysts can tolerate to high humidity without the generation of any NOx species. The structure, composition and chemistry of the catalyst were charactrized by XRD, Raman, TEM, SEM, nitrogen physisorption, XPS, XPF and in situ/ operando spectroscopic techniques. It is concluded thatvanadium oxides are present mainly as monomeric and polymeric species on these catalysts even when the V-loading approach theoretical monolayer coverage. Operando spectroscopic method is instrumental in revealing how the vanadium species evolve during the reaction and how they relate to the reaction behavior.

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