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Research on MoVTeNbO Catalyst Prepared Using TeO2 as Te Source

Author: LiAnLian
Tutor: WangJian
School: Northeast University of Petroleum
Course: Physical and chemical
Keywords: Propane Acrylic acid Selective oxidation Composite metal oxide catalyst
CLC: TQ426.6
Type: Master's thesis
Year: 2011
Downloads: 11
Quote: 0
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Abstract


With the widespread use of n- butane selective oxidation to maleic anhydride , acrylic selective oxidation of propane have also been more and more attention . Higher, but the stability of propane than butane stability but far less than the purpose of product acrylic and maleic anhydride , propane oxidation to acrylic acid selectivity and yield were lower . Therefore , the propane oxidation to acrylic acid by the complete oxidation of the strong competition in the thermodynamic efficient catalyst in order to obtain high yield . Composite metal oxide with the catalysis of the selective oxidation of propane to acrylic acid reaction , thus attention in recent years become a hot research . This thesis TeO2 for the the tellurium source Preparation of Mo 1.0 V 0.3 < / sub> Te 0.23 Nb 0.12 < / sub > O n composite metal oxide catalyst , using a fixed bed micro- reactor , a continuous feed , investigated the impact of various factors on the structure and properties of the catalyst during the preparation of the catalyst . The results showed that : a method using ultrasonic treatment , compared with a rotary stirring and magnetic stirring method is more conducive to the active ingredient to achieve the dispersion ; the hydrated reaction time in the preparation process , the hydration reaction temperature the MoVTe three component and MoVTeNb four component catalytic performance has a certain impact , concurrent pH range 2.0 2 .8 when the preparation of the catalyst is more appropriate , adding polyvinyl alcohol , and cetyl trimethyl ammonium bromide causes reduced performance of the catalyst preparation process . The use of microwave drying increases the catalyst specific surface area , under a nitrogen atmosphere , 300 ° C - room temperature -600 ℃ gap calcination can result in more complete the active phase . Optimization of the catalyst after the reaction temperature was 400 ° C , the space velocity is 800h-1, alumoxane volume ratio of 2:1 , the yield of acrylic acid 15.7% , the catalyst in the continuous run 96h little change in performance , propane the conversion rate of about 45% in about 15% yield of acrylic acid .

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CLC: > Industrial Technology > Chemical Industry > Reagents and the production of pure chemicals > Catalyst ( catalyst ) > Preparing Catalysts
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