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Spherical titanium dioxide catalyst and application thereof to preparation of hydrogen through supercritical water gasification by taking cyanobacteria as raw material

A titanium dioxide and spherical technology, applied in the field of resource engineering, can solve the problems of low hydrogen output, low hydrogen selectivity, and low hydrogen purity, and achieve the effects of efficient utilization, uniform particle size, and simple preparation methods

Active Publication Date: 2017-11-03
安徽绿泰环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, there are two shortcomings in the previous method: first, the output of hydrogen is relatively low based on the unit weight of dry algae; second, the purity of hydrogen in the gas phase is low, indicating that the selectivity of this method for producing hydrogen is low

Method used

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  • Spherical titanium dioxide catalyst and application thereof to preparation of hydrogen through supercritical water gasification by taking cyanobacteria as raw material
  • Spherical titanium dioxide catalyst and application thereof to preparation of hydrogen through supercritical water gasification by taking cyanobacteria as raw material

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Embodiment 1

[0028] Embodiment 1: preparation embodiment, the preparation of spherical titanium dioxide of the present invention

[0029] It is prepared by the following steps: first dissolve titanium sulfate and urea in an aqueous solution of isopropanol with a volume concentration of 30%, then place it in a polytetrafluoroethylene liner reactor, and conduct a hydrothermal reaction at 180°C for 15 hours. Cool and centrifuge to collect the precipitate, wash the precipitate with ethanol and water three times respectively, and dry at 70°C for 5 hours after washing. Wherein, the molar concentration of titanium sulfate is 2 mol / L, and the molar concentration of urea is 1.5 times of the molar concentration of titanium sulfate.

[0030] figure 2 It is the SEM scanning electron microscope picture of titanium dioxide product. It can be seen from the picture that it is a regular spherical shape with high uniformity and the particle size is between 600-800nm.

Embodiment 2

[0031] Embodiment 2: preparation embodiment, the preparation of spherical titanium dioxide of the present invention

[0032] It is prepared by the following steps: first dissolve titanium sulfate and urea in an aqueous solution of isopropanol with a volume concentration of 25%, then place it in a polytetrafluoroethylene-lined reactor, and conduct a hydrothermal reaction at 170°C for 16 hours. Cool and centrifuge to collect the precipitate, wash the precipitate twice with ethanol and water successively, and dry at 60°C for 6 hours after washing. Wherein, the molar concentration of titanium sulfate is 1.8 mol / L, and the molar concentration of urea is 1 time of the molar concentration of titanium sulfate.

[0033] The SEM scanning electron microscope observation result of titanium dioxide product is the same as embodiment 1.

Embodiment 3

[0034] Embodiment 3: preparation embodiment, the preparation of spherical titanium dioxide of the present invention

[0035] It is prepared by the following steps: first dissolve titanium sulfate and urea in an aqueous solution of isopropanol with a volume concentration of 35%, then place it in a polytetrafluoroethylene liner reactor, and conduct a hydrothermal reaction at 190°C for 14 hours. Cool and centrifuge, collect the precipitate, wash the precipitate with ethanol and water three times respectively, and dry at 80°C for 4 hours after washing. Wherein, the molar concentration of titanium sulfate is 2.2 mol / L, and the molar concentration of urea is twice of the molar concentration of titanium sulfate.

[0036] The SEM scanning electron microscope observation result of titanium dioxide product is the same as embodiment 1.

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Abstract

The invention discloses a spherical titanium dioxide catalyst and application thereof to preparation of hydrogen through supercritical water gasification by taking cyanobacteria as a raw material. The spherical titanium dioxide catalyst is prepared by the following steps: dissolving titanium sulfate and urea in an isopropyl alcohol-water solution with the volume concentration of 25-35% at first, then performing hydrothermal reaction for 14-16 h at 170-190 DEG C, and at last, performing centrifugation, washing and drying, wherein the molar concentration of titanium sulfate is 1.8-2.2 mol / L, and the molar concentration of urea is 1-2 times of that of titanium sulfate. The prepared spherical titanium dioxide can serve as a catalyst to be used for preparing hydrogen through supercritical water gasification by taking cyanobacteria as the raw material, so that, not only is the hydrogen output efficiency greatly improved, but also the concentration of hydrogen in a gaseous phase is greatly increased, and catalytic selectivity in preparation of hydrogen is achieved. The spherical titanium dioxide catalyst and the method can be used for treating and utilizing bloom-forming cyanobacteria, so that not only harmless treatment of cyanobacteria but also efficient resource utilization is realized.

Description

technical field [0001] The invention belongs to the field of resource engineering and relates to the treatment and utilization of cyanobacteria, in particular to a spherical titanium dioxide catalyst and its use for producing hydrogen through supercritical water gasification using cyanobacteria as raw materials. Background technique [0002] Cyanobacteria bloom is the most widely distributed and most harmful type of bloom outbreak in China. In order to avoid the continuous deterioration of water quality and ecology caused by it, salvage has become an important measure for the daily management and protection of eutrophic lakes, and the waste biomass of cyanobacteria is produced accordingly. Water eutrophication induces the formation of algal blooms, and its normal outbreaks produce a large amount of difficult-to-treat cyanobacterial waste biomass. The water content of cyanobacteria waste biomass is as high as 90-98%, rich in organic matter, nitrogen and phosphorus, and contai...

Claims

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Application Information

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IPC IPC(8): C01G23/053B01J21/06B01J35/08C01B3/04
CPCC01B3/042C01G23/0532B01J21/063C01P2004/62B01J35/51Y02E60/36Y02P20/54
Inventor 张会文朱伟颜庭轩丁磊马江雅张晓曼
Owner 安徽绿泰环保科技有限公司
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