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Method for preparing hydrogen from cellulose

A cellulose and hydrogen technology, applied in chemical instruments and methods, hydrogen, non-metallic elements, etc., can solve the problems of catalyst deactivation, low hydrogen yield, etc., to avoid side reactions, high conversion efficiency, high hydrogen selectivity and yield effect

Active Publication Date: 2014-01-29
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the catalyst deactivates quickly, and the hydrogen yield is extremely low, only 0.96mmol / g was obtained at 225°C biomass hydrogen yield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: the preparation of catalyst

[0025] Catalyst carrier of the present invention adopts powdered activated carbon, and its characteristics are as follows:

[0026] Specific surface: 873.4m 2 / g; average pore diameter 2.15nm.

[0027] Wash with deionized water several times and dry in an oven at 110°C before use.

[0028] Catalysts No. 1 to No. 5 were prepared by HCHO reduction method. Dissolve soluble metal salts in water to prepare a solution containing a certain amount of metal elements, and slowly add it into the activated carbon slurry under stirring. Then add NaOH solution and HCHO solution and heat to near boiling. Cool to room temperature, filter and wash with deionized water, and then dry at 110°C to prepare single-metal supported catalysts with different components (Table 1 is the prepared catalysts containing different metal components).

[0029] Specifically as the preparation of No. 1 catalyst: prepare the required amount of H 2 PtCl 6 Aqu...

Embodiment 2-8

[0035] Embodiment 2-8: the activity evaluation of catalyst

[0036] In the following examples, the following general method is used to carry out the hydrogen production reaction by hydrothermal reforming of cellulose with the reforming catalyst of Example 1.

[0037] The hydrothermal reforming hydrogen production reaction of cellulose was carried out in a 300mL autoclave, the amount of cellulose added was 2g, the amount of water added was 90g, the amount of catalyst added was 1g, the reaction temperature was 260°C, and the reaction time was 4h. The product was analyzed by gas chromatography.

[0038] The conversion rate of cellulose is calculated by the mass change of cellulose before and after the reaction:

[0039] Cellulose conversion rate (%)=(1-residual cellulose amount after reaction / added cellulose amount)×100, wherein the amount of residual cellulose after reaction is measured by the residual solid removal catalyst after reaction.

[0040] The gasification rate of reac...

Embodiment 9-13

[0056] Examples 9-13: Influence of reaction temperature on hydrogen production by hydrothermal reforming of cellulose

[0057] The effect of reaction temperature on cellulose-catalyzed hydrogen production was studied. The number of the reforming catalyst was 1. The other reaction processes were similar to those in Examples 2-8, except that the reaction temperature was different. The test results are as follows.

[0058] Table 3 Effect of reaction temperature on hydrogen production results of cellulose reforming

[0059]

[0060] As can be seen from Table 3, the yield of hydrogen increases significantly with the increase of temperature, while the selectivity of hydrogen decreases slightly.

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PUM

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Abstract

The invention relates to a method for preparing hydrogen from cellulose. In the method, a reaction is performed under the hydrothermal conditions of a lower temperature of between 180 and 320 DEG C and lower pressure of between 1 and 20MPa, wherein the process mainly comprises cellulose hydrolysis and hydrothermal reforming of a hydrolysis product; the cellulose hydrolysis is catalyzed by H+ produced through reversible ionization of extra water soluble Bronsted acid, water soluble Lewis acid, solid acid or water; a metal catalyst consists of an active ingredient and a carrier; the active ingredient of the metal catalyst is one or more of Pt, Pd, Ni, Co, Ir, Ru and Rh and accounts for 2 to 10 weight percent of the total amount of the catalyst; and the catalyst is prepared by a chemical reducing method or an immersion method. The method has the advantages of simple equipment, single reactor, no need of special equipment, relatively mild reaction conditions and high product hydrogen yield (20.3mmol / g cellulose) and selectivity and is easy to operate.

Description

technical field [0001] The invention relates to a method for producing hydrogen from cellulose. Background technique [0002] As a carrier of renewable energy, the development and utilization of biomass is of great significance in today's increasingly depleted fossil energy. The development and utilization of biomass can achieve zero emission of carbon dioxide, because the carbon dioxide produced in the process of biomass development will be consumed by the further growth of biomass. Biomass contains huge energy, but the current utilization rate of biomass by human beings only accounts for 3-4%, so the development and utilization of biomass is very promising. [0003] Hydrogen is an important chemical raw material, and it is widely used in the process of ammonia synthesis and petroleum refining in industry. In addition, hydrogen is considered to be one of the most potential energy carriers in the future due to its application in fuel cell technology, so hydrogen production...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B3/32
Inventor 田志坚温国栋徐云鹏曲炜李鹏徐竹生
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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