Surface Modification of Cobalt‐Manganese Mixed Oxide and Its Application for Low‐Temperature Propane Catalytic Combustion

Abstract

The CoÀ Mn mixed metal oxide was firstly fabricated using Co(NO 3) 2 , KMnO 4 and K 2 CO 3. The tuned catalysts, donated as xM-Co 3 Mn 1 (x = 0, 0.025, 0.05 and 0.1), were synthesized by selective dissolve method (SD). The physicochemical properties induced by different acid concentrations on catalysts were explored via a series of characterization techniques. Compared with the original material, the catalysts treated by SD had higher advantages in enriching crystal defects, surface Co 2 + and adsorbed oxygen species as well as increasing the specific surface areas (SSA). Among acid-treated catalysts, 0.05 M-Co 3 Mn 1 exhibited the best catalytic activity, while the T 50 and T 90 were 71 and 117°C lower than the original one. Meanwhile, 0.05 M-Co 3 Mn 1 showed excellent stability and great regeneration ability.

Advancement of modification engineering in lean methane combustion catalysts based on defect chemistry

“…The chemical etching can change the concentration of oxygen vacancies the roughness on the catalyst surface, specific surface area (SSA), etc., as well as the strength and number of acid and base sites on the catalyst. 101,119,[189][190][191][192][193] Transition metal oxide materials can be etched with acid or alkali solutions, enabling the modification of the catalyst surfaces and the construction of specific defects. As shown in Fig.…”

“…In comparison to other chemical etching methods, selective dissolution etching, which is characterized by welldefined etching targets and directivity, has an excellent performance in VOCs removal, 189,196 CH 4 and CO oxidation 190,197 as a new way to induce defects on the material surface. For example, Wang et al 198 selectively etched La 2 O 3 with acetic acid (HAc) (Fig.…”

Research Progress of a Composite Metal Oxide Catalyst for VOC Degradation

“…The presence of toluene inhibited the oxidation of n -butanol over Co–Al–Ce catalyst but promoted the high conversion of Pd/γ-Al 2 O 3 to n -butanol over the control catalyst. A VOC mixture is a serious test for the degradation performance of composite metal oxide catalysts, but many research results show that it is a reliable choice …”

“…The reactive oxygen species in the interface series reaction of CuO/V O −MnO 2 are maintained for longterm cyclic reactions so as to have excellent catalytic performance. Liu et al 104 synthesized modified catalyst xM− Co 3 Mn 1 (x = 0.025, 0.05, and 0.1) by the selective dissolution (SD) method for the first time. The catalyst treated with the selective dissolution method more higher advantages in enriching Co 2+ and absorbing oxygen on the surface of the crystallization defect and increasing the specific surface area of the catalyst.…”

“…A VOC show that it is a reliable choice. 104 Reducing the reaction temperature of catalytic combustion is the fundamental way to improve the efficiency of catalytic degradation of complex VOCs. Fang et al 113 optimized the SiO 2 -supported Cu−Mn catalyst by changing the composition of the active substance.…”