A nano ni/al 2 o 3 Catalyst and its preparation method and application

Abstract

The invention discloses a nano Ni / Al 2 o 3 Catalyst and its preparation method and application, the preparation method comprising the following steps: S1. preparing an aluminum nitrate solution containing polyethylene glycol; the molar ratio of aluminum ions in the polyethylene glycol to aluminum nitrate is 0.1 to 0.4; S2 .Add the precipitant solution to the aluminum nitrate solution under stirring until the pH is 4.5-5.5, and after the dispersion is uniform, add the nickel nitrate solution to form a water-soluble sol; S3. The water-soluble sol is aged at 15-30°C for 12-24h, Then dry to obtain xerogel; S4. Pre-calcining the xerogel, and then calcining to obtain a catalyst precursor, the catalyst precursor is sheet / rod nano-spinel; S5. Reducing the catalyst precursor to obtain the Nano Ni / Al 2 o 3 catalyst. Nano-Ni / Al prepared by the present invention 2 o 3 The catalyst has high specific surface area, uniform distribution of active metal Ni, and good dispersion of active metal Ni. It has high catalytic activity and strong catalytic stability when used to catalyze steam reforming of guaiacol for hydrogen production; the process is simple, the cost is low, and the conditions can be control.

Description

technical field [0001] The invention relates to the technical field of catalysts containing metals, more specifically, to a nano-Ni / Al 2 o 3 Catalyst and its preparation method and application. Background technique [0002] As a green energy carrier and clean fuel, hydrogen has been paid more and more attention to its development and utilization. The steam reforming biomass oil hydrogen production technology has the advantages of rich raw material resources, wide sources, low energy consumption, renewable, and environmentally friendly and clean. Tar is the main by-product of thermochemical conversion of biomass. Tar reforming to produce hydrogen is an effective technology for producing hydrogen. Now the acetic acid and alcohols in the tar are relatively easy to convert into hydrogen. Guaiacol is also a major component of tar, but it is currently converted to H 2 The current technology is limited by the activity and stability of the catalyst, resulting in low efficiency...

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a kind of nano-Ni / Al in order to overcome the defects of low catalytic activity and poor stability when catalytic steam reforming guaiacol hydrogen production described in the above-mentioned prior art 2 o 3 The preparation method of catalyst, the nanometer Ni / Al that makes 2 o 3 The catalyst has high specific surface area, uniform distribution of active metal Ni, and good dispersion of active metal Ni. The active metal Ni particles do not agglomerate at high temperature. It has high catalytic activity and strong catalytic stability when used to catalyze steam reforming of guaiacol for hydrogen production. No reunion and inactivation after multiple reactions

Images