Catalyst for preparation of isobutene by isobutene dehydrogenation as well as preparation process and dehydrogenation process thereof

A catalyst and isobutane technology, applied in the field of dehydrogenation technology, can solve the problems of unfavorable service life of the catalyst, complicated preparation steps of the catalyst, easy coke deactivation of the catalyst, etc., and achieve the effects of reducing the preparation cost, simple method and prolonging the service life.

Inactive Publication Date: 2011-04-06
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although these catalysts have high alkane conversion and olefin selectivity under certain reaction conditions, the catalyst preparation steps are cumbersome
Since the catalyst is prone to carbon deposition and deactivation under high temperature c

Method used

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  • Catalyst for preparation of isobutene by isobutene dehydrogenation as well as preparation process and dehydrogenation process thereof
  • Catalyst for preparation of isobutene by isobutene dehydrogenation as well as preparation process and dehydrogenation process thereof
  • Catalyst for preparation of isobutene by isobutene dehydrogenation as well as preparation process and dehydrogenation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0031] Example 1:

[0032] The catalyst ~A" has a composition of 0.4wt% Pt, 0.49wt% Sn (Pt:Sn=1:2), 1wt% K, and 1.73wt% Cl supported on alumina particles. The preparation method is as follows:

[0033] First take a certain amount of alumina particles, and then take a quantitative amount of SnCl dissolved in hydrochloric acid 2 Solution (calculated as 0.49% Sn), quantitative H 2 PtCl 6 The solution (calculated as 0.4% Pt) is made into a mixed solution, and a quantitative K is added after the complex is formed 2 CO 3 Solution (calculated at 1% K), then diluted with hydrochloric acid to make the required volume. The alumina particles were immersed in the above solution and mixed uniformly, then allowed to stand for 10 hours under indoor conditions, dried at 120°C for 12 hours, and then calcined in a tube furnace at 500°C at 50ml / min air for 4 hours. Load 10ml of catalyst into a fixed bed reactor at 480℃H 2 (150ml / min) Reduce under normal pressure in air flow for 2 hours. Then the tem...

Example Embodiment

[0039] Example 2:

[0040] The composition of the catalyst "B" is 0.4wt% Pt, 0.6wt% Sn (Pt:Sn=1:2.5), 1wt% K, 1.73wt% Cl supported on alumina particles, the preparation method is the same as in Example 1, and the reaction conditions are the same as in Example 1.

[0041] The reaction performance of catalyst "B" is shown in Table 3

[0042] Table 3: Catalyst B isobutane dehydrogenation performance

[0043]

Example Embodiment

[0044] Example 3: The composition of the catalyst "C" is 0.4wt% Pt, 0.73wt% Sn (Pt:Sn=1:3), 1wt% K, and 1.73wt% Cl supported on alumina particles. The preparation method is the same as in Example 1. The reaction feed composition was the same as in Example 1.

[0045] The reaction performance of catalyst "C" is shown in Table 4

[0046] Table 4: Catalyst C isobutane dehydrogenation performance

[0047]

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Abstract

The invention relates to a catalyst for the preparation of isobutene by isobutene dehydrogenation as well as a preparation process and a dehydrogenation process thereof. In the catalyst, a heat-resistant oxide is used as a carrier, a platinum group metal element is used as a main catalyst, an IVA group metal element is used as a first assistant, an alkali metal element is used as a second assistant, and a halogen element is used as a modifier. The catalyst is prepared by loading a solution containing the active components onto the heat-resistant oxide carrier in one step by adopting an isopyknic immersion method, has higher isobutene conversion rate, better isobutene selectivity and favorable stability by using a mixture of hydrogen and water vapor as a diluent, and is suitable for the application in industrialized production.

Description

technical field [0001] The invention relates to the technical field of catalytic dehydrogenation, in particular to a catalyst for preparing isobutene from isobutane dehydrogenation and a preparation method thereof, and a dehydrogenation process for preparing isobutene from isobutane dehydrogenation using the catalyst. Background technique [0002] Isobutene is a very important organic chemical raw material, mainly used in the preparation of methyl tert-butyl ether (MTBE), butyl rubber and polyisobutylene. In addition, it can also be used to synthesize various organic raw materials and fine chemicals such as methacrylate, isoprene, tert-butylphenol, tert-butylamine, 1,4-butanediol, ABS resin, etc. With the continuous development of isobutene downstream products and its derivatives, the demand for isobutene is increasing day by day, while the conventional steam cracking process, due to its own production technology constraints, limits the increase in isobutene production. At ...

Claims

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Application Information

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IPC IPC(8): B01J27/135C07C11/09C07C5/333
Inventor 王际东王伟屈一新李逢昌邵振兴毛锐章赵娟
Owner BEIJING UNIV OF CHEM TECH
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