Partial Oxidation of NO by H₂O₂ and afterward Reduction by NH₃-Selective Catalytic Reduction: An Efficient Method for NO Removal

Abstract

A system for NO removal from flue gas comprising partial oxidation by H 2 O 2 and selective catalytic reduction (SCR) process is proposed in this study. This hybrid system is found to be extremely efficient for deNO x at 200−290 °C. In this system, H 2 O 2 partially oxidizes the NO molecules to NO 2 . The NO/NO 2 mixture reacts fast with NH 3 on the surface of a V 2 O 5 −WO 3 /TiO 2 catalyst. The reaction kinetics was studied by varying reaction temperatures and the H 2 O 2 /NO molar ratio. A V 2 O 5 −WO 3 /TiO 2 SCR catalyst was also filled in the oxidation reactor, but it hardly changes the oxidation rate. The downstream SCR reaction was found to be significantly upgraded by the preoxidation process, which elevates the NO x reduction rate from 20% (without preoxidation) to more than 60% (with preoxidation).

Natural Polyphenol–Vanadium Oxide Nanozymes for Synergistic Chemodynamic/Photothermal Therapy

“…For VO x materials, the conversion of V 5+ to V 4+ is easily realized by the addition of reducing agents, and V 4+ in VO x materials has better NIR absorption than V 5+ [33, 41] . Contrarily, when excessive oxidants are added to VO x materials, the oxidation of V 4+ to V 5+ will occur, which can decrease the NIR absorption of VO x materials [34b, 42] . Upon the gradual addition of excessive H 2 O 2 , the NIR absorption gradually decreased (Figure S15 in the Supporting Information).…”

Investigation on Simultaneous Removal of SO2 and NO over a Cu–Fe/TiO2 Catalyst Using Vaporized H2O2: An Analysis on SO2 Effect

“…Nevertheless, excellent denitrification efficiency was achieved through SCR technology at a strict operation temperature window (300–400 °C) range . Besides, there were still other non-negligible operating problems, such as ammonia escape and air preheater blockage. , Therefore, it was extremely imperative to develop an eco-friendly pathway to simultaneously remove NO x and SO 2 in a relatively low-temperature range.…”

“…4 Besides, there were still other non-negligible operating problems, such as ammonia escape and air preheater blockage. 5,6 Therefore, it was extremely imperative to develop an eco-friendly pathway to simultaneously remove NO x and SO 2 in a relatively lowtemperature range.…”

Computational Study of Urea–Water Solution Sprays for the Analysis of the Injection Process in SCR-like Conditions

“…1,2 Selective Catalytic Reduction (SCR) has been determined to be one of the most efficient de-NOx methodologies. [3][4][5][6][7] The technology consists of an injection event of Urea Water Solution (UWS) which transforms into ammonia (NH 3 ) via evaporation, thermolysis and hydrolysis of the spray. 8 The ammonia mixes with the exhaust stream, entering into the SCR device transforming the incoming products into H 2 O and N 2 .…”