Honeycomb SCR smoke denitration catalyst embryoid body and preparation method thereof

Abstract

The invention discloses a honeycomb SCR (Selective Catalytive Redution) smoke denitration catalyst embryoid body and a preparation method thereof. The honeycomb SCR smoke denitration catalyst body consists of the following raw materials as per percentage by weight: 40 to 60 percent of titanium dioxide, 1 to 10 percent of white clay, 0.1 to 1 percent of ammonium metavanadate, 1 to 8 percent of ammonium meta-tungstate, 0.1 to 3 percent of niobium oxalate, 0.5 to 3 percent of lactic acid aqueous solution, 1 to 5 percent of oxalic acid aqueous solution, 25 to 35 percent of deionized water, 1 to 10 percent of ceramic fiber, 0.1 to 3 percent of fluff pulp, 0.1 to 1 percent of stearic acid, 0.1 to 1 percent of hydroxypropyl methyl cellulose and 1 to 5 percent of glycerol. The honeycomb SCR smokedenitration catalyst embryoid body has high plasticity, caking property and mechanical strength. The method is simple and convenient in operation and low in cost. Each component of the prepared catalyst body is dispersed uniformly; the catalyst body is easy in forming and demolding in the extrusion process and has high finished product rate; and the catalyst prepared by the embryoid body has highdenitration efficiency.

Description

technical field [0001] The invention relates to the technical field of exhaust gas treatment, in particular to a honeycomb SCR flue gas denitration catalyst embryo body and a preparation method thereof. Background technique [0002] With the promulgation of the "Emission Standards for Air Pollutants from Thermal Power Plants" (GB13223-2011), the emission standards for nitrogen oxides have become more stringent. Selective Catalytic Reduction (SCR) has high denitrification efficiency and can well control the emission of nitrogen oxides in thermal power plants. The catalyst is the core of the SCR technology. Since the SCR process is mostly arranged in the high-ash section between the economizer and the air preheater, the catalyst is in the high-dust flue gas. If the granular catalyst is used, the bed will be blocked and resistance The increase of the pressure drop increases the pressure, and the reaction cannot run continuously and stably for a long time. Therefore, commercial...

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Problems solved by technology

[0004] The Chinese patent with the authorized notification number CN101074161B discloses an aluminum titanate-mullite honeycomb ceramic and its preparation method. Firstly, the aluminum titanate and mullite are combined to form a composite material according to the performance requirements, and then the configured composite material is added. The plasticizing modifier and self-designed mould, the green body is obtained after mixing, mixing and extruding, and then dried and roasted to obtain a honeycomb structure. This preparation method is more complicated to operate and has a narrow scope of application. The obtained honeycomb structure cannot meet the performance requirements of catalysts required in the field of flue gas denitration

[0005] The Chinese patent with the authorized announcement number CN101502796B discloses an integral honeycomb selective catalytic reduction flue gas denitrification catalyst and its preparation method. The catalyst uses nano-titanium dioxide as the carrier and skeleton, and the denitrification active components are evenly distributed in the skeleton, and an appropriate proportion of combined agent, its weight percentage is: nano-titanium dioxide 60-85%, active component 4-25%, binder 5-20%, this catalyst is suitable for the treatment of large-scale power plant boiler tail gas, but the denitrification efficiency is low

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