Oxygen carrier for preparing hydrogen and synthesizing gas by reforming steam through two-step method

Abstract

The invention discloses an oxygen carrier with good economy and high activity and stability for preparing hydrogen and synthesizing gas by reforming steam through a two-step method, which realize the hydrogen preparation and the gas synthesis by reforming steam through a high-efficiency two-step method at lower temperature. The oxygen carrier comprises an active component and a carrier component and can be expressed by MO / Ce-ZrO2, wherein the Ce-ZrO2 is a carrier and the MO is an active component of metal oxide; the active component is hexaaluminate (AMAl11O19 and hexaaluminates with other forms). The mole fraction of the Ce-ZrO2 carrier component accounts for 30-90 percent of the mole fraction of the oxygen carrier and the mole fraction of the Ce-ZrO2 active component accounts for 10-70 percent of the mole fraction of the oxygen carrier. The mole fraction of CeO2 in the Ce-ZrO2 accounts for 10-100 percent. The conversion rate of the oxygen carrier and methane keeps over 85 percent; the mole ratio of H2 to CO in the synthetic gas is approximate to 2; the oxygen recovering degree is high; the purity of hydrogen gas is over 98 percent; and the oxygen carrier still has higher activity after 10 times of circulation.

Description

Technical field [0001] The invention relates to a technology for preparing pure hydrogen and synthesis gas by using steam and methane as raw materials, which is an unconventional methane steam reforming technology and belongs to the field of energy chemistry. Background technique [0002] Hydrogen energy is regarded as the most promising clean energy in the 21st century, and it is a very competitive energy carrier. Human beings have been interested in the application of hydrogen energy 200 years ago. Since the 1970s, many countries and regions in the world have extensively carried out hydrogen energy research. Existing hydrogen production methods can be divided into: hydrogen production by reforming, which refers to the reforming of fossil fuels to produce hydrogen; non-reforming hydrogen production methods, mainly including biological hydrogen production and hydrogen production from water (using water as a raw material) Hydrogen production method), in which the reforming of fos...

AI Technical Summary

Problems solved by technology

Remove Cu 0.7 Fe 2.3 o 4 / Ce-ZrO 2 In addition to showing high reactivity, other oxygen carriers have general performance, but Cu 0.7 Fe 2.3 o 4 / Ce-ZrO 2 Stability needs to be enhanced during the reaction

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