Catalyst for synthesizing methyl formate by selective oxidation of methanol and preparation method thereof

A catalyst and oxide technology, applied in the field of composite catalyst and its preparation, can solve the problems of low catalyst efficiency, low activity, low methanol selectivity, etc., and achieve the effects of long service life, high activity and simple synthesis process

Active Publication Date: 2011-03-16
PEKING UNIV
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Catalysts for the selective oxidation of methanol mainly include V 2 o 5 /TiO 2 、MoO 3 /SnO 2 and ReO x /CeO 2 , but the efficiency of these catalysts is low, showing that the conversion rate of the reactant methanol or the selecti

Method used

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  • Catalyst for synthesizing methyl formate by selective oxidation of methanol and preparation method thereof
  • Catalyst for synthesizing methyl formate by selective oxidation of methanol and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0026] Example 1. Preparation of TiO by dipping method 2 Supported Pt catalyst (Pt / TiO 2 )

[0027] Precursor Pt(NH 3 ) 4 (NO 3 ) 2 2mL of the aqueous solution of, in which the mass percentage of Pt is 5%, containing 0.100g Pt;

[0028] Add 4g of TiO to the above solution 2 Carrier (manufacturer: Alfa Aesar); stirred at 20°C for 1 hour, dried at 120°C, put into a muffle furnace and calcined at 400°C for 2 hours to obtain a supported TiO 2 Pt catalyst (Pt / TiO 2 ).

[0029] Characterized by plasma emission spectroscopy (ICP), the actual loading mass percentage of Pt is 5.2%, which is consistent with the theoretical loading (5.0%).

Example Embodiment

[0030] Example 2: Preparation of WO by dipping method 3 Modified γ-Al 2 O 3 Supported (monolayer dispersion) Pt catalyst (Pt / WO 3 -Al 2 O 3 )

[0031] (1) Preparation of WO 3 Modified γ-Al 2 O 3 Carrier

[0032] Formulation modifier WO 3 The precursor of [NH 4 ] 6 W 7 O 24 ·6H 2 O aqueous solution: weigh 1.268g [NH 4 ] 6 W 7 O 24 ·6H 2 O dissolved in 2ml water, WO 3 The molar concentration of is 2.33mol / L, and the amount of total substance is 4.66×10 -3 mol.

[0033] Add 4g γ-Al to the above solution 2 O 3 Carrier (manufacturer: CONDEA); stirred at 40°C for 2 hours, dried at 120°C, put into a muffle furnace and roasted at 400°C for 4 hours to obtain WO 3 Modified γ-Al 2 O 3 Carrier (WO 3 -Al 2 O 3 ).

[0034] (2) Preparation of WO 3 Modified γ-Al 2 O 3 Supported Pt catalyst

[0035] Precursor Pt(NH 3 ) 4 (NO 3 ) 2 2mL of the aqueous solution of, in which the mass percentage of Pt is 1%, and contains 0.020g Pt;

[0036] Add 4g of the above WO to the above solution 3 Modified γ-Al 2 O 3 Ca...

Example Embodiment

[0038] Example 3. Preparation of Al by co-precipitation method 2 O 3 Supported Pt catalyst (Pt / Al 2 O 3 )

[0039] Active ingredient Pt precursor and oxide Al 2 O 3 The preparation of the mixed solution of soluble metal salt: 30gAl(NO 3 ) 3 ·9H 2 O dissolved in 150mL water, and then with 10mL H 2 PtCl 6 ·6H 2 O aqueous solution is mixed; the mass percentage of Pt is 0.38%, containing 0.038g Pt; the mass concentration of Al is 1.20%, converted into Al 2 O 3 The mass is 4.08g.

[0040] Preparation of NaOH aqueous solution: Dissolve 40 g of NaOH in 100 mL of water to obtain solution B with a mass percentage of 28.6%.

[0041] At the same time, the above-mentioned mixed solution and NaOH aqueous solution were added dropwise to 100mL of water, during which the dropping speed of the two was adjusted to control the pH value to 8-9, and then stirred and aged at 70℃ for 4h, filtered and filtered. Wash until there is no Cl in the filtrate - Detected, dried at 160℃, put into muffle furnace and ...

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Abstract

The invention discloses a catalyst for synthesizing methyl formate by selective oxidation of methanol and a preparation method thereof. The catalyst is composed of active ingredients and a carrier, wherein the active ingredients account for 0.1%-10% of the catalyst by mass percent and comprise Au, Pd or Pt; and the carrier is an oxide A or B, the oxide A is any one of Al2O3, TiO2, ZrO2 and CeO2, and the oxide B is the oxide obtained by modifying the oxide A with a modifier WO3, MoO3, ZnO, MgO or NiO. The invention provides a preparation method of the catalyst. The preparation process is simple, the contents of the used noble metals are less, the used noble metals have high activity, and the method is suitable for the current common industrial production conditions and has good applicationprospects. The catalyst can be used for producing methyl formate by efficiently transforming methanol.

Description

technical field [0001] The invention relates to a composite catalyst in the chemical field and a preparation method thereof, in particular to a catalyst for efficiently selectively oxidizing methanol to synthesize methyl formate and a preparation method thereof. Background technique [0002] As an important platform molecule in C1 chemistry, methyl formate has broad application prospects. Starting from methyl formate, important chemicals such as formic acid, acetic acid and dimethyl carbonate can be synthesized, and methyl formate can be used as a gasoline additive to replace methyl tert-butyl ether. At present, methyl formate is mainly obtained by dehydrogenation of methanol on CuO catalyst and carbonylation under liquid caustic conditions. The former has problems such as high reaction temperature, high operating cost, and the conversion is limited by thermodynamic equilibrium; the latter is greatly restricted due to environmental pollution. In contrast, methanol selectiv...

Claims

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Application Information

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IPC IPC(8): B01J23/42B01J23/652B01J23/66C07C69/06C07C67/40
Inventor 刘海超黄华
Owner PEKING UNIV
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