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Hydrogenation catalysts prepared from polyoxometalate precursors and process for using same to produce ethanol while minimizing diethyl ether formation

A hydrogenation catalyst, catalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, catalyst activation/preparation, etc., can solve the problem that the catalyst does not have ethanol selectivity and the catalyst does not have sufficient conversion. rate, excessive operating temperature and pressure

Inactive Publication Date: 2014-06-18
CELANESE INT CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Existing processes suffer from various problems that hinder commercial viability, including: (i) the catalyst does not have the desired ethanol selectivity; (ii) the catalyst does not have the Sufficient conversion of ethylesters, a by-product of hydrogenation of carboxylic acids; (iii) catalysts may be too expensive and / or non-selective to ethanol formation and produce undesirable (iv) require excessive operating temperatures and pressures; (v) insufficient catalyst life; and / or (vi) form significant amounts of diethyl ether, a by-product of carboxylic acid hydrogenation

Method used

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  • Hydrogenation catalysts prepared from polyoxometalate precursors and process for using same to produce ethanol while minimizing diethyl ether formation
  • Hydrogenation catalysts prepared from polyoxometalate precursors and process for using same to produce ethanol while minimizing diethyl ether formation
  • Hydrogenation catalysts prepared from polyoxometalate precursors and process for using same to produce ethanol while minimizing diethyl ether formation

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preparation example Construction

[0041] Catalyst preparation method

[0042] The invention also relates to a process for the preparation of the catalyst. Without being limited by theory, the catalyst preparation method may improve one or more of acetic acid conversion, ester conversion, ethanol selectivity, and overall yield. In one embodiment, the support is modified with one or more support modifiers, and the resulting modified support is subsequently impregnated with a noble metal and one or more active metals to form a catalyst composition. For example, the support can be impregnated with a support modifier solution comprising a support modifier precursor and optionally one or more active metal precursors to form a modified support. After drying and calcination, the resulting modified support is impregnated with a second solution comprising a noble metal precursor and optionally one or more active metal precursors, followed by drying and calcination to form the final catalyst.

[0043] In this embodimen...

Embodiment 1-8

[0105] Eight platinum / tin / cobalt catalysts were prepared using different support modifiers in Examples 1-8. The resulting catalyst was then tested with the mixed feedstock in a hydrogenation unit. In Table 2 the catalyst compositions of Examples 1-8 are provided.

[0106]

[0107] Overview of catalyst preparation.

[0108] Using high surface area (HSA) commercial SiO 2 Support (HSASS #61138, 3 mm pellets, NorPro) was used as starting material for transition metal oxide modified supports. In general, catalyst supports are prepared by impregnating SiO with aqueous solutions of the corresponding W, Mo, Nb, or V polyoxometalate (POM) precursors (see Experimental Section). 2 The extrudate was then dried at 120°C and calcined at 550°C in air. Metal-supported catalysts were obtained by single-step incipient wetness impregnation using aqueous solutions of Sn, Co, and Pt in dilute nitric acid and metal oxide-modified silica supports.

[0109][SiO 2 -MO x (n)] catalyst support...

Embodiment 1

[0115] Example 1: SiO 2 -WO 3 (12). For this preparation, 176.0 g SiO 2 Vehicle (Norpro, 3mm pellets). By dissolving 25.504g (8.63mmol) ammonium metatungstate hydrate (AMT) in 250mL deionized H 2 Prepare the impregnation solution in O. The support was then impregnated using the incipient wetness technique and the material was dried using a rotary evaporator followed by drying overnight at 120°C under circulating air. The dried material was then calcined at 550°C / air for 6 hours. Yield: ~200 g light yellow extrudate. Noble metals and active metals were then impregnated onto the modified support according to the catalyst preparation procedure described below.

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Abstract

The present invention relates to hydrogenation catalysts prepared from polyoxometalate precursors. The polyoxometalate precursors introduce a support modifier to the catalyst. The catalysts are used for hydrogenating alkanoic acids and / or esters thereof to alcohols with relatively low ether formation, preferably with conversion of the ester coproduct. The catalyst may also comprise one or more active metals.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to: U.S. Application No. 13 / 419,617 filed March 14, 2012, U.S. Provisional Application No. 61 / 583,874 filed January 6, 2012, and U.S. Provisional Application No. 61 / 583,874 filed October 6, 2011 US Application No. 13 / 267,149, which is incorporated herein by reference in its entirety and disclosure. technical field [0003] The present invention relates to catalysts, processes for the preparation of hydrogenation catalysts from polyoxometalate precursors. The catalysts can be used for the production of ethanol from feedstocks comprising alkanoic acids and / or esters thereof with very low diethyl ether formation in the presence of the catalysts of the invention. Background technique [0004] Ethanol for industrial use is conventionally produced from petrochemical feedstocks such as oil, natural gas or coal, from feedstock intermediates such as synthesis gas, or from starchy or cellulosic ...

Claims

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Application Information

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IPC IPC(8): B01J37/02B01J23/89C07C29/149B01J23/648B01J23/652B01J27/188B01J23/644B01J23/843B01J23/847B01J23/85B01J27/185
Inventor H·魏纳周振华
Owner CELANESE INT CORP
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