Mesoporous-macroporous integral catalyst for purifying CO in hydrogen-rich gas and preparation

A monolithic catalyst and monolithic technology, applied in the direction of catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve the problems of large volume and large pressure drop, and achieve Small size, high mechanical strength, high activity effect

Inactive Publication Date: 2009-12-30
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The granular catalyst reactor of the reported small CO-PROX reactor has the problem of large pressure drop; in contrast, the monolithic catalyst, especially the microreactor, has obvious advantages, but its volume is still large

Method used

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  • Mesoporous-macroporous integral catalyst for purifying CO in hydrogen-rich gas and preparation
  • Mesoporous-macroporous integral catalyst for purifying CO in hydrogen-rich gas and preparation
  • Mesoporous-macroporous integral catalyst for purifying CO in hydrogen-rich gas and preparation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Preparation of Mesoporous-Macroporous Monolithic M-Pt-Ni / Al 2 o 3 (1:5) Catalyst

[0021] Preparation of mesoporous-macroporous monolithic catalyst: (1) Preparation of polystyrene template Styrene and divinylbenzene monomers were washed 4 times with an equal volume of 0.2mol / L NaOH solution, and then washed with an equal volume of deionized water 4 spares. Accurately weigh 6 mL of washed styrene and 1.5 mL of divinylbenzene, and put them into a 100 mL three-necked bottle. Add 0.062g of initiator azobisisobutyronitrile and 0.54g of surfactant Span 80 therein, and stir to make it evenly mixed. Slowly add 33.9 mL of deionized water (that is, the volume fraction of the aqueous phase is 82.0%) to the three-necked flask under stirring, and the dropping time is controlled at 60 min to form a reverse-phase thick emulsion. After continuing to stir for 30 minutes, the concentrated emulsion was moved into a mold, and placed in a constant temperature oven at 60°C for polymeriza...

Embodiment 2

[0025] According to the catalyst preparation steps of Example 1, the mesoporous-macroporous monolithic M-Pt-Ni / Al was prepared 2 o 3 (1: 3) catalyst, carry out the preferential oxidation of CO in the hydrogen-rich gas with this catalyst, the preferential oxidation condition is the same as embodiment 1, its result is: when 50 ℃, CO conversion rate 2.48%, selectivity 100%; 75 ℃, CO conversion rate 11.29%, selectivity 81.98%; at 100°C, CO conversion rate 30.96%, selectivity 71.02%; at 125°C, CO conversion rate 88.82%, selectivity 62.95%; at 150°C, CO conversion rate 98.52% , the selectivity is 57.72%; at 175°C, the CO conversion rate is 92.81%, and the selectivity is 48.73%; at 200°C, the CO conversion rate is 80.59%, and the selectivity is 46.73%.

Embodiment 3

[0027] According to the catalyst preparation steps of Example 1, the mesoporous-macroporous monolithic M-Pt-Ni / Al was prepared 2 o 3 (1:8) catalyst, carry out the preferential oxidation of CO in the hydrogen-rich gas with this catalyst, the preferential oxidation condition is the same as embodiment 1, its result is: when 50 ℃, CO conversion rate 5.15%, selectivity 100%; During 75 ℃, CO conversion rate 20.15%, selectivity 80.01%; at 100°C, CO conversion rate 25.15%, selectivity 62.91%; at 125°C, CO conversion rate 56.41%, selectivity 57.44%; at 150°C, CO conversion rate 83.01% , the selectivity was 56.02%; at 175°C, the CO conversion rate was 85.52%, and the selectivity was 49.11%; at 200°C, the CO conversion rate was 80.18%, and the selectivity was 42.91%.

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Abstract

The invention provides mesoporous-macroporous integral catalyst for purifying carbonic oxide (CO) in hydrogen-rich gas and preparation. The catalyst comprises macroporous integral alpha-Al2O3 carrier, a coating layer gamma- Al2O3 carried on the pore wall of macroporous integral alpha-Al2O3 carrier, active component Pt carried on the coating layer and cocatalyst Ni. The size of the macroporous is 5-100mum; the most probable diameter of the mesoporous on the pore wall is 2.8 -4.9nm; the thickness of pore wall of the pores is 0.1-2.5mum; and the pores are communicated with each other and are connected by pore windows. The mass percentages of Pt and Ni in the catalyst are that the mass percentage of Pt is 0.5-2% and the atomic molar ratio of Pt and Ni is 1:3-10. The catalyst provided by the invention features small size, high activity, better selectivity and certain water and CO2 resistance capability, can reduce the CO in the hydrogen-rich gas below 10ppm, in addition, the catalyst features strong mechanical strength, thereby effectively reducing the volume of a preferential oxidation reactor of the CO in the hydrogen-rich gas, and being particularly suitable for small-scale on-site hydrogen supplying device.

Description

technical field [0001] The invention relates to a mesoporous-macroporous monolithic catalyst used for CO purification in hydrogen-rich gas and its preparation, and belongs to the CO preferential oxidation technology in hydrogen-rich gas. Background technique [0002] The market prospect of fuel cells, especially proton exchange membrane fuel cells (PEMFCs) for driving automobiles and as small energy facilities is huge. The fuel of PEMFCs is pure hydrogen gas. At present, the feasible ways to produce hydrogen are liquid organic fuels, natural gas reforming or partial oxidation, assisted by water gas shift reaction, etc. Among them, the research and development of the hydrogen source system is one of the technical bottlenecks. The core problem that the hydrogen source system needs to solve is miniaturization. Therefore, the research and development of the small hydrogen production system has become a hot spot at home and abroad in recent years. [0003] The reformed gas-shift...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J35/10B01J37/08B01J37/02C01B3/58C01B31/20C01B32/50
Inventor 刘源卢素红张媛
Owner TIANJIN UNIV
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