Abstract
A series of MCM-41 molecular sieves with different molar ratio of template to silicon were synthesized through hydrothermal synthesis method by using cetyltrimethylammonium bromide (CTAB) as the template, diatomite as the silicon source. By using impregnation method, the Mn-Ce/MCM-41 SCR molecular sieve-based catalysts were prepared. The results observed that when the molar ratio of template to silicon was 0.2:1, the MCM-41 as catalyst carrier has the highest surface area and largest pore volume, it also presented typically ordered hexagonal arrays of uniform channels. The denitration catalytic material based on this carrier has a high number of Lewis acidic sites, and the denitration efficiency can reach more than 93%.
Highlights
IntroductionNitrogen oxides (NOx ) is a general term for various nitrogen oxides including NO, NO2 , and N2 O
Nitrogen oxides (NOx ) is a general term for various nitrogen oxides including NO, NO2, and N2 O.As a major source for air pollution, nitrogen oxides contribute to acid rain [1], photochemical smog [2], and ozone depletion [3]
It can be seen that diatomite has a high silicon content and can be used as an ideal raw material for the synthesis of MCM-41 molecular sieve
Summary
Nitrogen oxides (NOx ) is a general term for various nitrogen oxides including NO, NO2 , and N2 O. Undesirable processes occurring in SCR systems include several competitive, nonselective reactions with oxygen, which is abundant in the system These reactions can produce secondary emissions: 2NH3 + 2O2 = N2 O + 3H2 O (2). Because of its large specific area, it can be used as a catalyst carrier to support active components such as metal oxides [10]. The interior of diatomite has many nano-scale microporous structures and has strong adsorption capacity It has been widely used for filter aids and water treatment. The metal oxide of manganese and cerium as active component, denitration catalyst were synthesized. The effects of different molar ratio of template to silicon on the structure and morphology of MCM-41 were investigated, and denitration catalytic properties of MCM-41 supported Mn-Ce catalyst were studied
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