Catalyst Coating

Introduction

The catalyst coating is compound powder material composed of one or more metal oxides. Catalyst coating has several main functions: (1) Improve the mechanical strength and specific surface area of catalyst to meet the requirements of the catalytic requirements; (2) Dilute, support and disperse catalyst active ingredients and small amounts of auxiliaries, so as to improve the efficiency of catalyst; (3) Improve the activity, stability and toxicity resistance of the catalyst through the synergistic effect with precious metal active ingredients. Therefore, the catalyst performance is affected by the quality of the coating. With the rapid development of catalysts and the continuous improvement of standards of automobile exhaust and harmful gas emission, catalyst coating materials are constantly updated and reformed. At present, the most frequently catalyst coatings are alumina and zeolite.

Preparation Methods

The main methods of preparing catalyst coating on catalyst include impregnation method, slurry coating method and sol-gel method.

Impregnation method: First, a certain viscosity, surface tension and fluidity of slurry is prepared by the suspension agent, dispersant and additives, and then the catalyst substrate is impregnated in the slurry. The slurry liquid is sucked into the porous structure of the substrate because of the capillary effect. Finally, after drying and roasting, the coating slurry will attach to the catalyst substrate.
Slurry coating method: The method is to use wet ball milling method to grind the coating material into 5 μm size particles, and then coated coating slurry on the catalyst substrate, evenly.
Sol-gel method: The method relies on the accumulation of coating colloidal particles in the catalyst substrate during the gelation process, so as to form a coating on the catalyst substrate.

In fact, after the catalyst coating prepared by the above methods, drying and roasting processes are needed for several times to reach a certain load.

Preparation Methods

Our Products

Alfa Chemistry can provide a variety of alumina and zeolites catalyst coating. Some of them are as follows.

Alumina

Full Datasheet

Name	CAS	MF	MW	Appearance	Average particle size/nm	Crystal phase	Specific surface area/ (m²/g)	Purity	Apparent density/ (g/cm³)	Al₂O₃ content	Modified element content	D50 (μm)
Nano-alumina	1344-28-1	Al₂O₃	101.96	White powder	10-20	γ	120-160	99.99%	0.1-0.2	-	-	-
Nano-alumina	1344-28-1	Al₂O₃	101.96	White powder	50	γ	110-150	99.99%	0.1-0.3	-	-	-
Silicon-modified alumina	-	SiO₂-Al₂O₃	-	White powder	-	-	230-300	-	-	70-95%	5-30%	3-15
Rare earth-modified alumina	-	La₂O₃-Al2O3	-	White or light yellow powder	-	-	150-230	-	-	95-97%	3-5%	3-15
Rare earth-modified alumina	-	CeO₂-Al₂O₃	-	White or light yellow powder	-	-	150-200	-	-	95-97%	3-5%	3-15

Zeolite

Full Datasheet

Name	Topology structure	Cation	SiO₂/Al₂O₃ /(mol/mol)	CO₂-adsorb 2mm Hg/(%)	Na₂O/(%)	Particle size /D50 (μm)	Relative crystalinity	Unit cell /(Å)	Crystal size/(μm)	BET surface area/(m²/g)	NH₃-TPD /(mmol/g)
X-type zeolite	FAU	Na	2.0-2.3	≥8.0	-	2-7	≥75%	25.01-25.04	-	-	-
Y-type zeolite	FAU	Na	5.1-5.7	-	≤12.5	5-10	85-100%	24.56-24.70	-	-	-
	FAU	Na/NH₄	5.1-5.7	-	≤4.0	5-10	85-100%	24.63-24.67	-	-	-
	FAU	H	9.0-15.0	-	≤0.3	5-20	85-100%	24.38-24.42	-	-	-
	FAU	H	25.0-45.0	-	≤0.1	5-20	70-95%	24.28-24.34	-	-	-
	FAU	H	90.0-140.0	-	≤0.1	5-20	70-95%	24.25-24.31	-	-	-
	FAU	H	200-300	-	≤0.1	5-20	70-95%	24.22-24.27	-	-	-
Beta zeolite	BEA	Na	9.0-11.0	-	-	5-15	-	-	0.1-0.5	550-650	-
	BEA	H	25.0-30.0	-	-	5-10	-	-	0.2-0.8	650-750	1.2-1.5
	BEA	H	25.0-30.0	-	-	20-30	-	-	0.1-0.5	650-750	1.2-1.6
	BEA	H	38.0-42.0	-	-	20-30	-	-	0.1-0.5	650-750	0.7-1.1
	BEA	H	100-120	-	-	20-30	-	-	0.1-0.5	650-750	0.3-0.6
ZSM-5 zeolite	MFI	H	25.0-30.0	-	-	5-20	-	-	Different morphology	300-450	1.4-1.7
	MFI	H	35.0-40.0	-	-	5-20	-	-	1*4-hexagon	300-400	0.8-1.2
	MFI	H	45.0-50.0	-	-	5-20	-	-	1*4-hexagon	300-400	0.5-1.0
	MFI	H	About 1500	-	-	4-10	-	-	3*5-hexagon	300-450	-
EU-1 zeolite	EUO	H	35.0-45.0	-	-	3-10	-	-	0.5-2.0	350-500	0.8-1.1
SAPO-34 zeolite	CHA (Si-Al-P)	H	-	-	-	3-6	-	-	1.0-2.5	650-750	1.5-2.1
ZSM-35 zeolite	FER	H	12.5-14.5	-	-	5-10	-	-	0.5-2.0	350-500	1.9-2.5

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