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Phosphorus-doped cerium titanium catalyst as well as preparation method and application thereof to selective catalytic reduction denitrification

A phosphorus doping and catalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of reduced activity and selectivity, and achieve the improvement of N2 selectivity and reduction of non-selectivity. The effect of oxidation probability, good resistance to SO2 poisoning

Inactive Publication Date: 2018-10-19
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] To solve the existing cerium-titanium catalyst in CeO 2 When the content is too high, the activity and selectivity are significantly reduced. The present invention provides a method that significantly improves the high CeO 2 Activity of phosphorus-doped cerium-titanium catalysts with loaded cerium-titanium catalysts, preparation and application in selective catalytic reduction and denitrification

Method used

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  • Phosphorus-doped cerium titanium catalyst as well as preparation method and application thereof to selective catalytic reduction denitrification
  • Phosphorus-doped cerium titanium catalyst as well as preparation method and application thereof to selective catalytic reduction denitrification
  • Phosphorus-doped cerium titanium catalyst as well as preparation method and application thereof to selective catalytic reduction denitrification

Examples

Experimental program
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Effect test

Embodiment 1

[0026] P x TiO 2 Prepared by co-precipitation method. Phosphoric acid (H 3 PO 4 , 85wt.%) and titanium sulfate (Ti(SO 4 ) 2 ) are the precursors of P and Ti, respectively. Ammonia (NH 3 ·H 2 O, 25wt.%) as an alkali source. Different molar ratios (P and TiO 2 The molar ratios are x=0.05,0.1,0.15,0.2,0.3) of H 3 PO 4 and Ti(SO 4 ) 2 Mix evenly in deionized water under stirring, then slowly drop the ammonia solution into the aqueous solution until the pH is adjusted to 10, after stirring for 2 hours, keep the mixture at room temperature for 24 hours, dry at 80°C, then dry at 450°C Calcined for 4 hours to prepare P x TiO 2 carrier. Pure TiO 2 Prepared by the method described above without the addition of phosphoric acid.

[0027] 20wt%CeO 2 / TiO 2 and 20wt% CeO 2 / P x Ti(m CeO2 / (m CeO2 +m TiO2 )=20%) The catalyst was prepared by impregnation method. Ce(NO 3 ) 3 ·6H 2 O and the carrier were uniformly mixed in deionized water, heated and stirred. After...

Embodiment 2

[0029] 10wt% Ce / Ti, 10wt% Ce / P x Ti, 30wt% Ce / Ti and 30wt% Ce / P x Ti catalysts were prepared by impregnation. Ce(NO 3 ) 3 ·6H 2O and the carrier were uniformly mixed in deionized water, heated and stirred. After stirring for 2 h, the mixture was dried at 80 °C and then calcined at 700 °C for 2 h to obtain 10-Ce / Ti, 10-Ce / P x Ti, 30-Ce / Ti and 30-Ce / P x Ti catalyst.

Embodiment 3

[0031] P x TiO 2 Prepared by co-precipitation method. h 3 PO 4 and Ti(SO 4 ) 2 Mix evenly in deionized water under stirring, then slowly drop the ammonia solution into the aqueous solution until the pH is adjusted to 10, after stirring for 2 hours, keep the mixture at room temperature for 24 hours, then dry the mixture at 80°C, then Calcined at 700°C for 2 hours, P 0.15 TiO 2 carrier. Pure TiO 2 Prepared by the method described above without the addition of phosphoric acid.

[0032] The cerium-titanium catalyst was prepared by the impregnation method. Ce(NO 3 ) 3 ·6H 2 O and the carrier were uniformly mixed in deionized water, heated and stirred. After stirring for 2 h, the mixture was dried at 80 °C and then calcined at 700 °C for 2 h to give Ce / Ti-700 and Ce / P 0.15 Ti-700 catalyst.

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Abstract

The invention discloses a phosphorus-doped cerium titanium catalyst as well as a preparation method and the application thereof to selective catalytic reduction denitrification. The preparation methodcomprises the following steps: firstly dissolving titanium sulfate and a phosphate precursor in water, adding an alkaline precipitant, regulating the pH value to be more than or equal to 10, fully reacting and then washing, drying and calcining to obtain a phosphorus-doped TiO2 carrier; then dissolving the cerium nitrate and the phosphorus-doped TiO2 carrier in the water, stirring, reacting, thendrying and calcining to obtain the phosphorus-doped cerium titanium catalyst. The phosphorus-doped cerium titanium catalyst disclosed by the invention has a typical mesoporous structure, can effectively improve the absorption and the activation of NH3 on the carrier, simultaneously inhibits the oxidability of the CeO2 in an active matter and shows good catalytic reduction and denitrification ability, high N2 selectivity and sulfur resistance.

Description

technical field [0001] The invention belongs to the technical field of selective catalytic reduction and denitrification catalysts, and relates to a phosphorus-doped cerium-titanium catalyst, in particular to a phosphorus-doped TiO 2 Loading CeO for the carrier 2 Preparation of active component catalysts and their application in selective catalytic reduction denitrification. Background technique [0002] At present, energy consumption is increasing rapidly, and the number of motor vehicles is increasing year by year. NO x Emissions keep rising. With SO 2 Removal technology is becoming more and more mature, NO x Removal has become a research hotspot. Nitrogen oxides (NO x ) Selective Catalytic Reduction (SCR) is to reduce NO in stationary source flue gas x one of the effective techniques. Currently, V 2 o 5 -WO 3 / TiO 2 and V 2 o 5 -MoO 3 / TiO 2 etc. V-based catalysts have been widely used in commercial SCRs as industrial catalysts. However, these V-based cat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/18B01D53/86B01D53/90B01D53/56
CPCB01D53/8628B01D53/90B01J27/1804
Inventor 钟秦曾毅清张舒乐王天校
Owner NANJING UNIV OF SCI & TECH
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